subject:(Efficiency Fuel Economy Load Extension Load Expansion)

University of Michigan

1. Ortiz-Soto, Elliott Alexander. Combustion Modeling of Spark Assisted Compression Ignition for Experimental Analysis and Engine System Simulations.

Degree: PhD, Mechanical Engineering, 2013, University of Michigan

URL: http://hdl.handle.net/2027.42/102314

► Advanced combustion strategies provide significant efficiency and emissions benefits compared to conventional spark ignited (SI) combustion, but challenges related to combustion control and load limits… (more)

▼ Advanced combustion strategies provide significant efficiency and emissions benefits compared to conventional spark ignited (SI) combustion, but challenges related to combustion control and load limits have made these technologies difficult to implement in practical systems. Until now, low cost reduced order models necessary for large parametric and multi-cycle studies capable of accurately capturing the full range of combustion modes from homogeneous charge compression ignition (HCCI) and spark-assisted compression ignition (SACI) to SI have not been available. This important computational gap for advanced combustion engine research was the primary motivation for this doctoral work. The outcomes of this study include powerful new tools to evaluate advanced combustion strategies as well as novel methods to incorporate important advanced combustion characteristics into reduced order models. A reduced order thermodynamic model of advanced SACI combustion was first proposed. The model was used with available experimental data and previous high fidelity simulation results to develop a new empirical auto-ignition burn rate model that captures the effects of ignition timing, composition, temperature, pressure, engine speed, stratification and flame propagation. A complete engine model was then developed and incorporated into the commercial simulation software GT-Power. The model included chemical kinetics for low temperature heat release and auto-ignition detection and the empirical burn rate model for post-ignition heat release, as well as a new flame propagation model with improved physical groundings. The calibrated engine model showed good agreement with experimental trends of HCCI, SACI and SI combustion modes. The engine model was then used to assess practical strategies for accessing the advanced combustion regime and improving engine efficiency. The results showed HCCI and SACI provide a pathway for significant efficiency benefits compared to throttled SI, with efficiency improvements between 15-25% across a range of loads from 1-7 bar BMEP. Further efficiency gains appear possible beyond the experimentally observed SACI limit. As a further exercise, the load extension potential of boosted SACI combustion was conceptually investigated using a simple thermodynamic framework incorporating the empirical burn rate model and practical operating constraints. The results indicate boosted SACI can nearly double the maximum engine load compared to naturally aspirated operation. Advisors/Committee Members: Wooldridge, Margaret S. (committee member), Assanis, Dionissios N. (committee member), Fidkowski, Krzysztof J. (committee member), Martz, Jason Brian (committee member), Lavoie, George A. (committee member), Babajimopoulos, Aristotelis (committee member), Borgnakke, Claus (committee member).

Subjects/Keywords: Spark Assisted Compression Ignition, Saci; Homogeneous Charge Compression Ignition, Hcci, Spark Ignition, Si, Knock; Advanced Combustion Engines; Combustion Modeling; Engine Simulation; Efficiency, Fuel Economy, Load Extension, Load Expansion; Mechanical Engineering; Engineering

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Ortiz-Soto, E. A. (2013). Combustion Modeling of Spark Assisted Compression Ignition for Experimental Analysis and Engine System Simulations. (Doctoral Dissertation). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/102314

Chicago Manual of Style (16^th Edition):

Ortiz-Soto, Elliott Alexander. “Combustion Modeling of Spark Assisted Compression Ignition for Experimental Analysis and Engine System Simulations.” 2013. Doctoral Dissertation, University of Michigan. Accessed February 26, 2021. http://hdl.handle.net/2027.42/102314.

MLA Handbook (7^th Edition):

Ortiz-Soto, Elliott Alexander. “Combustion Modeling of Spark Assisted Compression Ignition for Experimental Analysis and Engine System Simulations.” 2013. Web. 26 Feb 2021.

Vancouver:

Ortiz-Soto EA. Combustion Modeling of Spark Assisted Compression Ignition for Experimental Analysis and Engine System Simulations. [Internet] [Doctoral dissertation]. University of Michigan; 2013. [cited 2021 Feb 26]. Available from: http://hdl.handle.net/2027.42/102314.

Council of Science Editors:

Ortiz-Soto EA. Combustion Modeling of Spark Assisted Compression Ignition for Experimental Analysis and Engine System Simulations. [Doctoral Dissertation]. University of Michigan; 2013. Available from: http://hdl.handle.net/2027.42/102314

Delft University of Technology

2. Cancino Queirolo, Mauricio Andrés (author). Impact of Morphing Winglets on Aircraft Performance.

Degree: 2018, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:86a76d02-70f8-4468-a805-40ab4900b1a0

► Morphing winglets are devices that can improve aircraft aerodynamic efficiency and also be used as load alleviation devices. However, this implementation comes with a weight… (more)

Subjects/Keywords: Winglets; Morphing Winglets; Morphing Structures; Aerodynamic Efficiency; Load Alleviation; Actuator Sizing; Reduced Fuel Consumption; Morphing Mechanism; Range Improvement

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APA (6^th Edition):

Cancino Queirolo, M. A. (. (2018). Impact of Morphing Winglets on Aircraft Performance. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:86a76d02-70f8-4468-a805-40ab4900b1a0

Chicago Manual of Style (16^th Edition):

Cancino Queirolo, Mauricio Andrés (author). “Impact of Morphing Winglets on Aircraft Performance.” 2018. Masters Thesis, Delft University of Technology. Accessed February 26, 2021. http://resolver.tudelft.nl/uuid:86a76d02-70f8-4468-a805-40ab4900b1a0.

MLA Handbook (7^th Edition):

Cancino Queirolo, Mauricio Andrés (author). “Impact of Morphing Winglets on Aircraft Performance.” 2018. Web. 26 Feb 2021.

Vancouver:

Cancino Queirolo MA(. Impact of Morphing Winglets on Aircraft Performance. [Internet] [Masters thesis]. Delft University of Technology; 2018. [cited 2021 Feb 26]. Available from: http://resolver.tudelft.nl/uuid:86a76d02-70f8-4468-a805-40ab4900b1a0.

Council of Science Editors:

Cancino Queirolo MA(. Impact of Morphing Winglets on Aircraft Performance. [Masters Thesis]. Delft University of Technology; 2018. Available from: http://resolver.tudelft.nl/uuid:86a76d02-70f8-4468-a805-40ab4900b1a0

Univerzitet u Beogradu

3. Dobratić, Predrag S., 1980- 28356455. Nosivost i stepen iskorišćenja cilindričnih zupčastih parova u uslovima višestruke sprege.

Degree: Mašinski fakultet, 2019, Univerzitet u Beogradu

URL: https://fedorabg.bg.ac.rs/fedora/get/o:20238/bdef:Content/get

►

Tehničke nauke, mašinstvo - Opšte mašinske konstrukcije / Technical sciences, mechanical engineering - General mechanical constructions (general machine design)

U domenu prenosa i transformacije snage… (more)

Subjects/Keywords: Gear pairs; load distribution; multiple mesh; teeth root load capacity; energy efficiency.

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APA (6^th Edition):

Dobratić, Predrag S., 1. 2. (2019). Nosivost i stepen iskorišćenja cilindričnih zupčastih parova u uslovima višestruke sprege. (Thesis). Univerzitet u Beogradu. Retrieved from https://fedorabg.bg.ac.rs/fedora/get/o:20238/bdef:Content/get

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Dobratić, Predrag S., 1980- 28356455. “Nosivost i stepen iskorišćenja cilindričnih zupčastih parova u uslovima višestruke sprege.” 2019. Thesis, Univerzitet u Beogradu. Accessed February 26, 2021. https://fedorabg.bg.ac.rs/fedora/get/o:20238/bdef:Content/get.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Dobratić, Predrag S., 1980- 28356455. “Nosivost i stepen iskorišćenja cilindričnih zupčastih parova u uslovima višestruke sprege.” 2019. Web. 26 Feb 2021.

Vancouver:

Dobratić, Predrag S. 12. Nosivost i stepen iskorišćenja cilindričnih zupčastih parova u uslovima višestruke sprege. [Internet] [Thesis]. Univerzitet u Beogradu; 2019. [cited 2021 Feb 26]. Available from: https://fedorabg.bg.ac.rs/fedora/get/o:20238/bdef:Content/get.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Dobratić, Predrag S. 12. Nosivost i stepen iskorišćenja cilindričnih zupčastih parova u uslovima višestruke sprege. [Thesis]. Univerzitet u Beogradu; 2019. Available from: https://fedorabg.bg.ac.rs/fedora/get/o:20238/bdef:Content/get

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Brno University of Technology

4. Peroutková, Alena. Palivové cykly jaderné elektrárny Dukovany: Nuclear fuel cycles of Dukovany NPP.

Degree: 2019, Brno University of Technology

URL: http://hdl.handle.net/11012/34327

► This thesis describes types of nuclear power plants, construction of pressurized water reactor, principle of fission processes and energy release. There is more detailed described… (more)

Subjects/Keywords: palivový cyklus; Dukovany; palivová vsázka; VVER; fuel cycle; Dukovany; fuel load; VVER

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APA (6^th Edition):

Peroutková, A. (2019). Palivové cykly jaderné elektrárny Dukovany: Nuclear fuel cycles of Dukovany NPP. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/34327

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Peroutková, Alena. “Palivové cykly jaderné elektrárny Dukovany: Nuclear fuel cycles of Dukovany NPP.” 2019. Thesis, Brno University of Technology. Accessed February 26, 2021. http://hdl.handle.net/11012/34327.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Peroutková, Alena. “Palivové cykly jaderné elektrárny Dukovany: Nuclear fuel cycles of Dukovany NPP.” 2019. Web. 26 Feb 2021.

Vancouver:

Peroutková A. Palivové cykly jaderné elektrárny Dukovany: Nuclear fuel cycles of Dukovany NPP. [Internet] [Thesis]. Brno University of Technology; 2019. [cited 2021 Feb 26]. Available from: http://hdl.handle.net/11012/34327.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Peroutková A. Palivové cykly jaderné elektrárny Dukovany: Nuclear fuel cycles of Dukovany NPP. [Thesis]. Brno University of Technology; 2019. Available from: http://hdl.handle.net/11012/34327

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

5. Fan, Bin. Algorithmic Engineering Towards More Efficient Key-Value Systems.

Degree: 2013, Carnegie Mellon University

URL: http://repository.cmu.edu/dissertations/286

► Distributed key-value systems have been widely used as elemental components of many Internet-scale services at sites such as Amazon, Facebook and Twitter. This thesis examines… (more)

▼ Distributed key-value systems have been widely used as elemental components of many Internet-scale services at sites such as Amazon, Facebook and Twitter. This thesis examines a system design approach to scale existing key-value systems, both horizontally and vertically, by carefully engineering and integrating techniques that are grounded in recent theory but also informed by underlying architectures and expected workloads in practice. As a case study, we re-design FAWN-KV—a distributed key-value cluster consisting of “wimpy” key-value nodes—to use less memory but achieve higher throughput even in the worst case. First, to improve the worst-case throughput of a FAWN-KV system, we propose a randomized load balancing scheme that can fully utilize all the nodes regardless of their query distribution. We analytically prove and empirically demonstrate that deploying a very small but extremely fast load balancer at FAWN-KV can effectively prevent uneven or dynamic workloads creating hotspots on individual nodes. Moreover, our analysis provides service designers a mathematically tractable approach to estimate the worst-case throughput and also avoid drastic overprovisioning in similar distributed key-value systems. Second, to implement the high-speed load balancer and also to improve the space efficiency of individual key-value nodes, we propose novel data structures and algorithms, including the cuckoo filter, a Bloom filter replacement that is high-speed, highly compact and delete-supporting, and optimistic cuckoo hashing, a fast and space-efficient hashing scheme that scales on multiple CPUs. Both algorithms are built upon conventional cuckoo hashing but are optimized for our target architectures and workloads. Using them as building blocks, we design and implement MemC3 to serve transient data from DRAM with high throughput and low-latency retrievals, and SILT to provide cost-effective access to persistent data on flash storage with extremely small memory footprint (e.g., 0.7 bytes per entry)

Subjects/Keywords: Memory Efficiency; Hash Table; Bloom Filter; Caching; Load Balancing; Computer Sciences

15 more images…

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APA (6^th Edition):

Fan, B. (2013). Algorithmic Engineering Towards More Efficient Key-Value Systems. (Thesis). Carnegie Mellon University. Retrieved from http://repository.cmu.edu/dissertations/286

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Fan, Bin. “Algorithmic Engineering Towards More Efficient Key-Value Systems.” 2013. Thesis, Carnegie Mellon University. Accessed February 26, 2021. http://repository.cmu.edu/dissertations/286.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Fan, Bin. “Algorithmic Engineering Towards More Efficient Key-Value Systems.” 2013. Web. 26 Feb 2021.

Vancouver:

Fan B. Algorithmic Engineering Towards More Efficient Key-Value Systems. [Internet] [Thesis]. Carnegie Mellon University; 2013. [cited 2021 Feb 26]. Available from: http://repository.cmu.edu/dissertations/286.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Fan B. Algorithmic Engineering Towards More Efficient Key-Value Systems. [Thesis]. Carnegie Mellon University; 2013. Available from: http://repository.cmu.edu/dissertations/286

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

6. Colim, Glenda Maria. Estudo dos fatores que afetam a transferência de carga em juntas de pavimentos de concreto simples.

Degree: Mestrado, Engenharia de Transportes, 2009, University of São Paulo

URL: http://www.teses.usp.br/teses/disponiveis/3/3138/tde-01042009-184655/ ;

►

Este trabalho de pesquisa foi realizado na busca de melhor entendimento do comportamento estrutural de pavimentos de concreto no que tange a transferência de carga… (more)

▼

Este trabalho de pesquisa foi realizado na busca de melhor entendimento do comportamento estrutural de pavimentos de concreto no que tange a transferência de carga em juntas, de quais os fatores que influenciam essa transferência de esforços nas juntas e a determinação, em caráter preliminar, de como as condições climáticas vigentes na área tropical dos estudos afeta o fenômeno. Para a realização dos experimentos foi empregada a pista experimental USP/FAPESP, construída em 1999, e até então não empregada para a determinação dos efeitos de transferência de cargas em juntas com e sem barra de transferência de carga. Paralelamente, para retroanalisar os parâmetros de transferência de carga, foram necessárias a avaliação e a análise estrutural de respostas a carregamentos dinâmicos das placas de concreto da pista experimental, possibilitando a determinação de diversos parâmetros em jogo, em especial, do módulo de elasticidade de concretos e do módulo de reação do subleito. Os estudos permitiram determinar que a ausência de barras de transferência de cargas em juntas transversais torna menos eficiente tal transferência além de apresentar nesse caso forte dependência da temperatura do concreto. Em juntas com barras de transferência de carga, para qualquer época do ano, a transferência de cargas é sempre igual ou superior a 90%, aproximadamente, independentemente da geometria das placas. Não existindo tais dispositivos o valor da transferência de cargas variou de 60 a 75%. Não foram observadas dependências importantes quanto a diferentes níveis de carregamento durante os testes, bem como para espessuras de placas de concreto, em placas com barras de transferência. Observou-se, também, embora em escala inferior ao que se narra na literatura passada, que o módulo de reação do subleito para carga de borda é maior que aquele para carga de centro. As faixas de valores de módulos de elasticidade para concretos de placas e para concretos compactados com rolo em sub-bases coincidiram com as faixas de valores encontrados em laboratório com medidas efetuadas na época da construção dos pavimentos. O processo de retroanálise com o programa ISLAB2000 mostrou-se um recurso valioso para a parametrização dos pavimentos de concreto estudados.

This research was proposed aiming an in deep study of the mechanism of load transfer across concrete pavement joints including the analysis of which factors influence such load transfers with special regards to the climate factors as concrete temperature. The concrete pavements under study were built in 1999 as a research supported by FAPESP, whose experimental sections has not been used before for such a goal. Backcalculation techniques were employed to analyze deflection data collected with FWD tests over the slabs and it was possible to define values for the test sections materials parameters like concrete modulus of elasticity and the modulus of subgrade reaction. Tests detected loss of load transfer efficiency on the dependence of concrete temperature for non dowelled joints. For dowelled…

Advisors/Committee Members: Balbo, José Tadeu.

Subjects/Keywords: Concrete pavements; Juntas estruturais; Load transfer efficiency; Pavimentação de concreto

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APA (6^th Edition):

Colim, G. M. (2009). Estudo dos fatores que afetam a transferência de carga em juntas de pavimentos de concreto simples. (Masters Thesis). University of São Paulo. Retrieved from http://www.teses.usp.br/teses/disponiveis/3/3138/tde-01042009-184655/ ;

Chicago Manual of Style (16^th Edition):

Colim, Glenda Maria. “Estudo dos fatores que afetam a transferência de carga em juntas de pavimentos de concreto simples.” 2009. Masters Thesis, University of São Paulo. Accessed February 26, 2021. http://www.teses.usp.br/teses/disponiveis/3/3138/tde-01042009-184655/ ;.

MLA Handbook (7^th Edition):

Colim, Glenda Maria. “Estudo dos fatores que afetam a transferência de carga em juntas de pavimentos de concreto simples.” 2009. Web. 26 Feb 2021.

Vancouver:

Colim GM. Estudo dos fatores que afetam a transferência de carga em juntas de pavimentos de concreto simples. [Internet] [Masters thesis]. University of São Paulo; 2009. [cited 2021 Feb 26]. Available from: http://www.teses.usp.br/teses/disponiveis/3/3138/tde-01042009-184655/ ;.

Council of Science Editors:

Colim GM. Estudo dos fatores que afetam a transferência de carga em juntas de pavimentos de concreto simples. [Masters Thesis]. University of São Paulo; 2009. Available from: http://www.teses.usp.br/teses/disponiveis/3/3138/tde-01042009-184655/ ;

Penn State University

7. TUTAR, TOLGA. Validating the Impact of Plug Load Reduction on Achieving Deep Energy Retrofits.

Degree: 2012, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/16324

► Increasing energy prices, perceived shortage of traditional energy resources and increasing carbon emissions have increased the attention paid to climate and energy issues. These issues… (more)

Subjects/Keywords: plug load; energy-efficiency; deep energy retrofit; energy audit

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APA (6^th Edition):

TUTAR, T. (2012). Validating the Impact of Plug Load Reduction on Achieving Deep Energy Retrofits. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/16324

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

TUTAR, TOLGA. “Validating the Impact of Plug Load Reduction on Achieving Deep Energy Retrofits.” 2012. Thesis, Penn State University. Accessed February 26, 2021. https://submit-etda.libraries.psu.edu/catalog/16324.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

TUTAR, TOLGA. “Validating the Impact of Plug Load Reduction on Achieving Deep Energy Retrofits.” 2012. Web. 26 Feb 2021.

Vancouver:

TUTAR T. Validating the Impact of Plug Load Reduction on Achieving Deep Energy Retrofits. [Internet] [Thesis]. Penn State University; 2012. [cited 2021 Feb 26]. Available from: https://submit-etda.libraries.psu.edu/catalog/16324.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

TUTAR T. Validating the Impact of Plug Load Reduction on Achieving Deep Energy Retrofits. [Thesis]. Penn State University; 2012. Available from: https://submit-etda.libraries.psu.edu/catalog/16324

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Colorado

8. Rodriguez, Michael John. The Effects of Wind on Foraging Strategies of Atta cephalotes Leaf-Cutter Ants.

Degree: MS, Ecology & Evolutionary Biology, 2014, University of Colorado

URL: https://scholar.colorado.edu/ebio_gradetds/55

► Successful foragers alter their behavior in response to variation in local conditions, resulting in reduction of foraging costs and maximization of resource gain. In… (more)

Subjects/Keywords: ants; behavior; efficiency; foraging; leaf-cutter; load selection; Behavior and Ethology

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APA (6^th Edition):

Rodriguez, M. J. (2014). The Effects of Wind on Foraging Strategies of Atta cephalotes Leaf-Cutter Ants. (Masters Thesis). University of Colorado. Retrieved from https://scholar.colorado.edu/ebio_gradetds/55

Chicago Manual of Style (16^th Edition):

Rodriguez, Michael John. “The Effects of Wind on Foraging Strategies of Atta cephalotes Leaf-Cutter Ants.” 2014. Masters Thesis, University of Colorado. Accessed February 26, 2021. https://scholar.colorado.edu/ebio_gradetds/55.

MLA Handbook (7^th Edition):

Rodriguez, Michael John. “The Effects of Wind on Foraging Strategies of Atta cephalotes Leaf-Cutter Ants.” 2014. Web. 26 Feb 2021.

Vancouver:

Rodriguez MJ. The Effects of Wind on Foraging Strategies of Atta cephalotes Leaf-Cutter Ants. [Internet] [Masters thesis]. University of Colorado; 2014. [cited 2021 Feb 26]. Available from: https://scholar.colorado.edu/ebio_gradetds/55.

Council of Science Editors:

Rodriguez MJ. The Effects of Wind on Foraging Strategies of Atta cephalotes Leaf-Cutter Ants. [Masters Thesis]. University of Colorado; 2014. Available from: https://scholar.colorado.edu/ebio_gradetds/55

KTH

9. Karampour, Mazyar. MEASUREMENT AND MODELLING OF ICE RINK HEAT LOADS.

Degree: Applied Thermodynamics and Refrigeration, 2011, KTH

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-61330

► Ice rinks are among the most energy intensive public buildings in developed and developing countries. According to a research on Swedish ice rinks; a… (more)

▼ Ice rinks are among the most energy intensive public buildings in developed and developing countries. According to a research on Swedish ice rinks; a typical ice rink consumes approximately 1185 MWh/year which leads to more than 300 GWh/year for the 342 Swedish indoor ice rinks. The refrigeration system is usually the largest consumer by 43% average share of the total energy consumption. To decrease the refrigeration system energy demand, there are a variety of energy efficiency techniques known and available but the key to select the best ones is finding the major heat loads on the ice sheet and refrigeration system, which is unique for each ice rink. To fulfil this objective and in addition to review literature, this study has two main approaches. The first approach is to measure and evaluate the performance of the refrigeration system in two ice rinks, called Norrtälje and Älta. The estimated cooling capacity is approximately equal to the total heat load on the ice plus the heat gains in the distribution system. This goal has been accomplished by using a performance analyser called “ClimaCheck” which is based on an “internal method” because it uses the compressor as an internal mass flow meter and consequently, there is no need for an external one. The refrigerant mass flow rate is calculated by an energy balance over the compressor. By knowing the mass flow, enthalpy of the refrigerant, etc. the cooling capacity and COP of the system can be calculated. While the total heat load is known by the first approach, the second approach tries to discover different heat loads shares by analytical modelling. The measured physical and thermodynamical parameters plus the ice rink geometrical characteristics are input to the heat transfer correlations to estimate the heat load magnitude. The results of the measurements show that the total energy consumption in Norrtälje is about two third of Älta. The main reasons for this less energy consumption are smarter control systems for compressors and pumps, better ventilation distribution design and 1°C-2°C higher ice temperature. Analytical modelling for a sample day has estimated that about 84% of the total heat loads is originated from the heat loads on ice sheet while the distribution system causes the remaining 16%. Moreover, calculations show that convection plus small portion of condensation (altogether 36%), radiation (23%), ice resurfacing (14%) and lighting (7%) are the largest heat loads in winter while in summer condensation is another significant heat load (10%). Comparing two six-hour periods, one without ice resurfacing and four resurfacings in the second one, 30% more cooling demand has been calculated for the second period. Furthermore, it has been shown that the evaporator to brine is the contributor for 66% of the heat transfer resistances from ice to evaporator while brine to bottom ice and bottom to top ice accounts for 27% and 7% respectively. To conclude, a parallel “performance analysis of the refrigeration…

Subjects/Keywords: Ice Rink; Refrigeration; Heat Load; Power Consumption; Energy Efficiency; Modelling; Measurement

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Karampour, M. (2011). MEASUREMENT AND MODELLING OF ICE RINK HEAT LOADS. (Thesis). KTH. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-61330

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Karampour, Mazyar. “MEASUREMENT AND MODELLING OF ICE RINK HEAT LOADS.” 2011. Thesis, KTH. Accessed February 26, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-61330.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Karampour, Mazyar. “MEASUREMENT AND MODELLING OF ICE RINK HEAT LOADS.” 2011. Web. 26 Feb 2021.

Vancouver:

Karampour M. MEASUREMENT AND MODELLING OF ICE RINK HEAT LOADS. [Internet] [Thesis]. KTH; 2011. [cited 2021 Feb 26]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-61330.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Karampour M. MEASUREMENT AND MODELLING OF ICE RINK HEAT LOADS. [Thesis]. KTH; 2011. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-61330

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

10. Miranda, José Pedro Oliveira. Load insensitive radio frequency amplifiers to MIMO applications .

Degree: 2019, Universidade de Aveiro

URL: http://hdl.handle.net/10773/29634

► This document focuses on techniques to make a radio frequency amplifying stage insensitive to load variation. Solutions like isolators, balanced amplifiers, balanced antenna and adaptive… (more)

Subjects/Keywords: RFPA; Load Insensitive; Class–E; Efficiency; MIMO transmitter; 5G

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APA (6^th Edition):

Miranda, J. P. O. (2019). Load insensitive radio frequency amplifiers to MIMO applications . (Thesis). Universidade de Aveiro. Retrieved from http://hdl.handle.net/10773/29634

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Miranda, José Pedro Oliveira. “Load insensitive radio frequency amplifiers to MIMO applications .” 2019. Thesis, Universidade de Aveiro. Accessed February 26, 2021. http://hdl.handle.net/10773/29634.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Miranda, José Pedro Oliveira. “Load insensitive radio frequency amplifiers to MIMO applications .” 2019. Web. 26 Feb 2021.

Vancouver:

Miranda JPO. Load insensitive radio frequency amplifiers to MIMO applications . [Internet] [Thesis]. Universidade de Aveiro; 2019. [cited 2021 Feb 26]. Available from: http://hdl.handle.net/10773/29634.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Miranda JPO. Load insensitive radio frequency amplifiers to MIMO applications . [Thesis]. Universidade de Aveiro; 2019. Available from: http://hdl.handle.net/10773/29634

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Pretoria

11. Chatterjee, Arnab. Optimization of mine ventilation fan speeds according to ventilation on demand and time of use tariff.

Degree: MEng, Electrical, Electronic and Computer Engineering, 2014, University of Pretoria

URL: http://hdl.handle.net/2263/45900

► With the growing concerns about energy shortage and demand supply imbalance, demand side management (DSM) activities has found its way into the mining industry. This… (more)

Subjects/Keywords: UCTD; Energy efficiency; Load Management; Optimization; Mining networks; Ventilation on demand

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APA (6^th Edition):

Chatterjee, A. (2014). Optimization of mine ventilation fan speeds according to ventilation on demand and time of use tariff. (Masters Thesis). University of Pretoria. Retrieved from http://hdl.handle.net/2263/45900

Chicago Manual of Style (16^th Edition):

Chatterjee, Arnab. “Optimization of mine ventilation fan speeds according to ventilation on demand and time of use tariff.” 2014. Masters Thesis, University of Pretoria. Accessed February 26, 2021. http://hdl.handle.net/2263/45900.

MLA Handbook (7^th Edition):

Chatterjee, Arnab. “Optimization of mine ventilation fan speeds according to ventilation on demand and time of use tariff.” 2014. Web. 26 Feb 2021.

Vancouver:

Chatterjee A. Optimization of mine ventilation fan speeds according to ventilation on demand and time of use tariff. [Internet] [Masters thesis]. University of Pretoria; 2014. [cited 2021 Feb 26]. Available from: http://hdl.handle.net/2263/45900.

Council of Science Editors:

Chatterjee A. Optimization of mine ventilation fan speeds according to ventilation on demand and time of use tariff. [Masters Thesis]. University of Pretoria; 2014. Available from: http://hdl.handle.net/2263/45900

California State University – Sacramento

12. Kaur, Puneet. Methodology for building-to-grid testbed implementation.

Degree: MS, Electric and Electronic Engineering, 2011, California State University – Sacramento

URL: http://hdl.handle.net/10211.9/1032

► The University of California Berkeley created a building-to-grid (B2G) test bed facility at one of their buildings called Cory Hall to research and analyze the… (more)

Subjects/Keywords: Smart grid; Energy efficiency; Load management; Demand response

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APA (6^th Edition):

Kaur, P. (2011). Methodology for building-to-grid testbed implementation. (Masters Thesis). California State University – Sacramento. Retrieved from http://hdl.handle.net/10211.9/1032

Chicago Manual of Style (16^th Edition):

Kaur, Puneet. “Methodology for building-to-grid testbed implementation.” 2011. Masters Thesis, California State University – Sacramento. Accessed February 26, 2021. http://hdl.handle.net/10211.9/1032.

MLA Handbook (7^th Edition):

Kaur, Puneet. “Methodology for building-to-grid testbed implementation.” 2011. Web. 26 Feb 2021.

Vancouver:

Kaur P. Methodology for building-to-grid testbed implementation. [Internet] [Masters thesis]. California State University – Sacramento; 2011. [cited 2021 Feb 26]. Available from: http://hdl.handle.net/10211.9/1032.

Council of Science Editors:

Kaur P. Methodology for building-to-grid testbed implementation. [Masters Thesis]. California State University – Sacramento; 2011. Available from: http://hdl.handle.net/10211.9/1032

Vanderbilt University

13. Cummins, Joshua Joseph. Characterization of a Pneumatic Strain Energy Accumulator: Efficiency and First Principles Models with Uncertainty Analysis.

Degree: PhD, Mechanical Engineering, 2016, Vanderbilt University

URL: http://hdl.handle.net/1803/11159

► Several technical needs were identified and addressed for advancing the Strain Energy Accumulator (SEA), which is an energy storage device consisting of an expandable rubber… (more)

▼ Several technical needs were identified and addressed for advancing the Strain Energy Accumulator (SEA), which is an energy storage device consisting of an expandable rubber bladder inside of a rigid shroud that stores energy in the form of pressure and strain. First, multiscale modeling methods were investigated to estimate the homogenized elastic modulus of carbon nanotube (CNT) rubber. The result is homogenized modulus estimates ranging from a few times to almost 80 times the elastic modulus of rubber, indicating the need for validation of existing models or development of new models to estimate the modulus for matrix and inclusion materials having drastically dissimilar moduli. Second, an analytical methodology was developed for simultaneously characterizing the energy storage in pneumatic and strain energy systems including component efficiency. By incorporating uncertainty analysis, the efficiencies of the strain energy accumulator are measured in over 2500 cycles of testing to be consistently over 93 %. Third, system state efficiency models were developed and expanded. Through experimentation, the model was determined to be favorably conservative with system efficiency projections ranging from 31 % to over 60 % depending on the system configuration. In addition, materials challenges in high pressure applications led to the conceptual investigation of CNT elastomers offering improved material strength properties and the potential for self-sensing. In previous research, carbon nanotube sensor thread was tested as a distributed sensor on carbon fiber reinforced composites and was able to monitor strain and detect damage in composite panels. The use of nanomaterials for self-sensing was extended in the current work with proof of concept tests performed on electrically conductive elastomers that exhibited the ability to monitor load and detect damage in specific directions. Each of these contributions in the areas of materials modeling, uncertainty analysis, and component and system efficiency quantification techniques has helped to advance the Strain Energy Accumulator technology. Advisors/Committee Members: Eric J Barth (committee member), Sankaran Mahadevan (committee member), Thomas J Withrow (committee member), Florence Sanchez (committee member), Douglas E Adams (Committee Chair).

Subjects/Keywords: Efficiency; Modeling; Strain Energy; Pneumatics; Conductive Elastomers; Load and Damage Monitoring

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APA (6^th Edition):

Cummins, J. J. (2016). Characterization of a Pneumatic Strain Energy Accumulator: Efficiency and First Principles Models with Uncertainty Analysis. (Doctoral Dissertation). Vanderbilt University. Retrieved from http://hdl.handle.net/1803/11159

Chicago Manual of Style (16^th Edition):

Cummins, Joshua Joseph. “Characterization of a Pneumatic Strain Energy Accumulator: Efficiency and First Principles Models with Uncertainty Analysis.” 2016. Doctoral Dissertation, Vanderbilt University. Accessed February 26, 2021. http://hdl.handle.net/1803/11159.

MLA Handbook (7^th Edition):

Cummins, Joshua Joseph. “Characterization of a Pneumatic Strain Energy Accumulator: Efficiency and First Principles Models with Uncertainty Analysis.” 2016. Web. 26 Feb 2021.

Vancouver:

Cummins JJ. Characterization of a Pneumatic Strain Energy Accumulator: Efficiency and First Principles Models with Uncertainty Analysis. [Internet] [Doctoral dissertation]. Vanderbilt University; 2016. [cited 2021 Feb 26]. Available from: http://hdl.handle.net/1803/11159.

Council of Science Editors:

Cummins JJ. Characterization of a Pneumatic Strain Energy Accumulator: Efficiency and First Principles Models with Uncertainty Analysis. [Doctoral Dissertation]. Vanderbilt University; 2016. Available from: http://hdl.handle.net/1803/11159

14. Cetin, Kristen Sara. Smart technology enabled residential building energy use and peak load reduction and their effects on occupant thermal comfort.

Degree: PhD, Civil Engineering, 2015, University of Texas – Austin

URL: http://hdl.handle.net/2152/30516

► Residential buildings in the United States are responsible for the consumption of 38% of electricity, and for much of the fluctuations in the power demands… (more)

▼ Residential buildings in the United States are responsible for the consumption of 38% of electricity, and for much of the fluctuations in the power demands on the electric grid, particularly in hot climates. Residential buildings are also where occupants spend nearly 69% of their time. As “smart” technologies, including electric grid-connected devices and home energy management systems are increasingly available and installed in buildings, this research focuses on the use of these technologies combined with available energy use data in accomplishing three main objectives. The research aims to: (a) better understand how residential buildings currently use electricity, (b) evaluate the use of these smart technologies and data to reduce buildings’ electricity use and their contribution to peak loads, and (c) develop a methodology to assess the impacts of these operational changes on occupant thermal comfort. Specifically this study focuses on two of the most significant electricity consumers in residential buildings: large appliances, including refrigerators, clothes washers, clothes dryers and dishwashers, and heating, ventilation and air conditioning (HVAC) systems. First, to develop an improved understanding of current electricity use patterns of large appliances and residential HVAC systems, this research analyzes a large set of field-collected data. This dataset includes highly granular electricity consumption information for residential buildings located in a hot and humid climate. The results show that refrigerators have the most reliable and consistent use, while the three user-dependent appliances varied more greatly among houses and by time-of-day. In addition, the daily use patterns of appliances vary in shape depending on a number of factors, particularly whether or not the occupants work from home, which contrasts with common residential building energy modeling assumptions. For the all-air central HVAC systems studied, the average annual HVAC duty cycle was found to be approximately 20%, and varied significantly depending on the season, time of day, and type of residential building. Duty cycle was also correlated to monthly energy use. This information provides an improvement to previously assumed values in indoor air modeling studies. Overall, the work presented here enhances the knowledge of how the largest consumers of residential buildings, large appliances and HVAC, operate and use energy, and identifies influential factors that affect these use patterns. The methodologies developed can be applied to determine use patterns for other energy consuming devices and types of buildings, to further expand the body of knowledge in this area. Expanding on this knowledge of current energy use, smart large appliances and residential HVAC systems are investigated for use in reducing peak electric grid loads, and building energy use, respectively. This includes a combination of laboratory testing, field-collected data, and modeling. For appliance peak load reduction, refrigerators are found to have a good… Advisors/Committee Members: Novoselac, Atila (advisor), Webber, Michael (committee member), Blackhurst, Michael (committee member), Tabares, Paulo (committee member), Manuel, Lance (committee member), Corsi, Richard (committee member).

Subjects/Keywords: Building energy efficiency; Smart buildings; Peak load reduction; Thermal comfort

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APA (6^th Edition):

Cetin, K. S. (2015). Smart technology enabled residential building energy use and peak load reduction and their effects on occupant thermal comfort. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/30516

Chicago Manual of Style (16^th Edition):

Cetin, Kristen Sara. “Smart technology enabled residential building energy use and peak load reduction and their effects on occupant thermal comfort.” 2015. Doctoral Dissertation, University of Texas – Austin. Accessed February 26, 2021. http://hdl.handle.net/2152/30516.

MLA Handbook (7^th Edition):

Cetin, Kristen Sara. “Smart technology enabled residential building energy use and peak load reduction and their effects on occupant thermal comfort.” 2015. Web. 26 Feb 2021.

Vancouver:

Cetin KS. Smart technology enabled residential building energy use and peak load reduction and their effects on occupant thermal comfort. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2015. [cited 2021 Feb 26]. Available from: http://hdl.handle.net/2152/30516.

Council of Science Editors:

Cetin KS. Smart technology enabled residential building energy use and peak load reduction and their effects on occupant thermal comfort. [Doctoral Dissertation]. University of Texas – Austin; 2015. Available from: http://hdl.handle.net/2152/30516

Clemson University

15. Crabtree, Brianna. Strength and Behavior of Rural Short-Span Precast Concrete Bridges in South Carolina.

Degree: MS, Civil Engineering, 2020, Clemson University

URL: https://tigerprints.clemson.edu/all_theses/3443

► The South Carolina Department of Transportation (SCDOT) is currently in the process of load rating every bridge in their inventory. Two types of short-span… (more)

▼ The South Carolina Department of Transportation (SCDOT) is currently in the process of load rating every bridge in their inventory. Two types of short-span precast concrete bridges built around the 1960s are prevalent throughout the state, exhibiting different levels of deterioration. In order to better understand how these bridge typologies behave under loading, two test types were conducted and will be discussed in this thesis. The first test conducted was a live load test on an in-service bridge containing flat precast concrete slabs. This test was used to evaluate transverse load distribution and efficiency of the longitudinal slab-to-slab joints. The precast slabs span fifteen feet and are five and a half feet wide, and they have slab-to-slab joints consisting of v-shaped interlocking shear keys. The live load test consisted of a crawling (< 5 mph) loaded dump truck at several critical locations while simultaneously measuring vertical displacement in the slabs. From the deflection data, joint efficiency and experimental distribution factors for moments (DFMs) were calculated. Based on the test results it is recommended that 0.55 should be the minimum distribution factor used when calculating moment demand. Having a high DFM proves that this in-service bridge lacks transverse distribution between adjacent slabs as each slab will carry 55% of a trucks load. These results demonstrated that the interlocking shear keys along the transverse joints are not capable of distributing loads transversely in their current state, and each slab acts independently. The second group of tests conducted were laboratory tests on “arch” beams. They are so-named because the cross-section includes an arch-shaped void between two stems and below the top flange. To better understand the capacity of these bridges’ service and strength tests were conducted—a service load test, a flexural test taken to failure, and an autopsy of the specimen tested. The service load tests were performed on three bolt-connected arch beams to determine transverse load distribution as well as the bolt connection efficacy; the failure test was performed on a single arch beam in order to determine the flexural capacity; and the autopsy was performed to determine number, size and location of the steel reinforcement. The service load tests indicated the bolt connections provided minimal transverse load distribution. The data from these tests indicate a DFM of 0.5 should be used to calculate moment demand during load rating. Thus an arch beam will support as much as 50% of a truck’s weight due to the lack of transverse load distribution from the bolt connections. The arch beam failed at 597 kip-ft during the flexural failure test. Based on assumed material properties and the reinforcement pattern found during the autopsy, the beam has a much higher capacity than should be expected. Original assumptions about the material properties were based on the SCDOT construction practices of the 1960s which indicated concrete compressive strength of 4 ksi and steel yield… Advisors/Committee Members: Brandon Ross, Michael Stoner.

Subjects/Keywords: Arch Beams; Distribution Factors; Joint Efficiency; Load Rating; Slab Bridges

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Crabtree, B. (2020). Strength and Behavior of Rural Short-Span Precast Concrete Bridges in South Carolina. (Masters Thesis). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_theses/3443

Chicago Manual of Style (16^th Edition):

Crabtree, Brianna. “Strength and Behavior of Rural Short-Span Precast Concrete Bridges in South Carolina.” 2020. Masters Thesis, Clemson University. Accessed February 26, 2021. https://tigerprints.clemson.edu/all_theses/3443.

MLA Handbook (7^th Edition):

Crabtree, Brianna. “Strength and Behavior of Rural Short-Span Precast Concrete Bridges in South Carolina.” 2020. Web. 26 Feb 2021.

Vancouver:

Crabtree B. Strength and Behavior of Rural Short-Span Precast Concrete Bridges in South Carolina. [Internet] [Masters thesis]. Clemson University; 2020. [cited 2021 Feb 26]. Available from: https://tigerprints.clemson.edu/all_theses/3443.

Council of Science Editors:

Crabtree B. Strength and Behavior of Rural Short-Span Precast Concrete Bridges in South Carolina. [Masters Thesis]. Clemson University; 2020. Available from: https://tigerprints.clemson.edu/all_theses/3443

University of New Mexico

16. Rios, Dionicio. Second law analysis and the application of the efficient power criterion to a four-temperature-level absorption chiller.

Degree: Mechanical Engineering, 2015, University of New Mexico

URL: http://hdl.handle.net/1928/27954

► Absorption chillers are a good option for air-conditioning applications and can be operated by low grade energy which makes them environmentally friendly. Common absorption chillers… (more)

Subjects/Keywords: Absorption chiller; Second law analysis; Efficiency power criterion; Four-temperature-level; Efficiency-cooling load compromise

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APA (6^th Edition):

Rios, D. (2015). Second law analysis and the application of the efficient power criterion to a four-temperature-level absorption chiller. (Masters Thesis). University of New Mexico. Retrieved from http://hdl.handle.net/1928/27954

Chicago Manual of Style (16^th Edition):

Rios, Dionicio. “Second law analysis and the application of the efficient power criterion to a four-temperature-level absorption chiller.” 2015. Masters Thesis, University of New Mexico. Accessed February 26, 2021. http://hdl.handle.net/1928/27954.

MLA Handbook (7^th Edition):

Rios, Dionicio. “Second law analysis and the application of the efficient power criterion to a four-temperature-level absorption chiller.” 2015. Web. 26 Feb 2021.

Vancouver:

Rios D. Second law analysis and the application of the efficient power criterion to a four-temperature-level absorption chiller. [Internet] [Masters thesis]. University of New Mexico; 2015. [cited 2021 Feb 26]. Available from: http://hdl.handle.net/1928/27954.

Council of Science Editors:

Rios D. Second law analysis and the application of the efficient power criterion to a four-temperature-level absorption chiller. [Masters Thesis]. University of New Mexico; 2015. Available from: http://hdl.handle.net/1928/27954

17. McMahon, Brendan. Deformation mechanisms beneath shallow foundations.

Degree: PhD, 2013, University of Cambridge

URL: http://www.dspace.cam.ac.uk/handle/1810/244367https://www.repository.cam.ac.uk/bitstream/1810/244367/2/license.txt ; https://www.repository.cam.ac.uk/bitstream/1810/244367/3/license_url ; https://www.repository.cam.ac.uk/bitstream/1810/244367/4/license_text ; https://www.repository.cam.ac.uk/bitstream/1810/244367/5/license_rdf ; https://www.repository.cam.ac.uk/bitstream/1810/244367/6/thesis.pdf.txt ; https://www.repository.cam.ac.uk/bitstream/1810/244367/8/thesis.pdf.txt ; https://www.repository.cam.ac.uk/bitstream/1810/244367/9/thesis.pdf.jpg

► Shallow foundations can provide the most economical solution for supporting small-scale structures. The design approach is quite simple considering the ultimate bearing capacity and working-load… (more)

▼ Shallow foundations can provide the most economical solution for supporting small-scale structures. The design approach is quite simple considering the ultimate bearing capacity and working-load settlement. Research has shown that settlement calculations, determined using a linear-elastic approach, usually govern the design but this approach is inappropriate because soil is highly non-linear, even at small strains. The result is that signifi cant discrepancies are observed between predicted and actual settlements. This uncertainty has seen the development of settlement-based approaches such as Mobilisable Strength Design (MSD). MSD uses an assumed undrained mechanism and accounts for soil non-linearity by scaling a triaxial stress-strain curve to make direct predictions of footing load-settlement behaviour. Centrifuge experiments were conducted to investigate the mechanisms governing the settlement of shallow circular foundations on clay and saturated sand models. Clay model tests were performed on soft or rm kaolin beds, depending on its pre-consolidation. Sand model tests were performed on relatively loose Hostun sand saturated with methyl-cellulose to slow consolidation. One-dimensional actuators were developed to apply footing loads through dead-weight or pneumatic loading. A Perspex window in the centrifuge package allowed digital images to be captured of a central cross-section, during and after footing loading. These were used to deduce soil displacements by Particle Image Velocimetry which were consistent with footing settlements measured directly. Deformation mechanisms are presented for undrained penetration, consolidation due to transient flow, as measured by pore pressure transducers, and creep. A technique was developed for discriminating consolidation settlements from the varying rates of short and long-term creep of clay models. Using MSD, a method for predicting the undrained penetration of a spread foundation on clay was proposed, using database results alone, which then provided estimates of creep and consolidation settlements that follow. The importance of the undrained penetration necessitated further investigation by using the observed undrained mechanism as the basis of an ellipsoidal cavity expansion model. An upper-bound energy approach was used to determine the load-settlement behaviour of circular shallow foundations on linear-elastic and non-linear clays, with yield defined using the von Mises' yield criterion. Linear-elastic soil results were consistent with those obtained from nite element analyses. The non-linear model, as described by a power-law, showed good agreement with both centrifuge experiment results and some real case histories. The single design curve developed through this model for normalised footing pressure and settlement could be used by practising engineers based on existing soil correlations or site investigations.

Subjects/Keywords: Circular shallow foundations; Centrifuge; Clay; Sand; Load-settlement; Cavity expansion; Non-linear

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APA (6^th Edition):

McMahon, B. (2013). Deformation mechanisms beneath shallow foundations. (Doctoral Dissertation). University of Cambridge. Retrieved from http://www.dspace.cam.ac.uk/handle/1810/244367https://www.repository.cam.ac.uk/bitstream/1810/244367/2/license.txt ; https://www.repository.cam.ac.uk/bitstream/1810/244367/3/license_url ; https://www.repository.cam.ac.uk/bitstream/1810/244367/4/license_text ; https://www.repository.cam.ac.uk/bitstream/1810/244367/5/license_rdf ; https://www.repository.cam.ac.uk/bitstream/1810/244367/6/thesis.pdf.txt ; https://www.repository.cam.ac.uk/bitstream/1810/244367/8/thesis.pdf.txt ; https://www.repository.cam.ac.uk/bitstream/1810/244367/9/thesis.pdf.jpg

Chicago Manual of Style (16^th Edition):

McMahon, Brendan. “Deformation mechanisms beneath shallow foundations.” 2013. Doctoral Dissertation, University of Cambridge. Accessed February 26, 2021. http://www.dspace.cam.ac.uk/handle/1810/244367https://www.repository.cam.ac.uk/bitstream/1810/244367/2/license.txt ; https://www.repository.cam.ac.uk/bitstream/1810/244367/3/license_url ; https://www.repository.cam.ac.uk/bitstream/1810/244367/4/license_text ; https://www.repository.cam.ac.uk/bitstream/1810/244367/5/license_rdf ; https://www.repository.cam.ac.uk/bitstream/1810/244367/6/thesis.pdf.txt ; https://www.repository.cam.ac.uk/bitstream/1810/244367/8/thesis.pdf.txt ; https://www.repository.cam.ac.uk/bitstream/1810/244367/9/thesis.pdf.jpg.

MLA Handbook (7^th Edition):

McMahon, Brendan. “Deformation mechanisms beneath shallow foundations.” 2013. Web. 26 Feb 2021.

Vancouver:

McMahon B. Deformation mechanisms beneath shallow foundations. [Internet] [Doctoral dissertation]. University of Cambridge; 2013. [cited 2021 Feb 26]. Available from: http://www.dspace.cam.ac.uk/handle/1810/244367https://www.repository.cam.ac.uk/bitstream/1810/244367/2/license.txt ; https://www.repository.cam.ac.uk/bitstream/1810/244367/3/license_url ; https://www.repository.cam.ac.uk/bitstream/1810/244367/4/license_text ; https://www.repository.cam.ac.uk/bitstream/1810/244367/5/license_rdf ; https://www.repository.cam.ac.uk/bitstream/1810/244367/6/thesis.pdf.txt ; https://www.repository.cam.ac.uk/bitstream/1810/244367/8/thesis.pdf.txt ; https://www.repository.cam.ac.uk/bitstream/1810/244367/9/thesis.pdf.jpg.

Council of Science Editors:

McMahon B. Deformation mechanisms beneath shallow foundations. [Doctoral Dissertation]. University of Cambridge; 2013. Available from: http://www.dspace.cam.ac.uk/handle/1810/244367https://www.repository.cam.ac.uk/bitstream/1810/244367/2/license.txt ; https://www.repository.cam.ac.uk/bitstream/1810/244367/3/license_url ; https://www.repository.cam.ac.uk/bitstream/1810/244367/4/license_text ; https://www.repository.cam.ac.uk/bitstream/1810/244367/5/license_rdf ; https://www.repository.cam.ac.uk/bitstream/1810/244367/6/thesis.pdf.txt ; https://www.repository.cam.ac.uk/bitstream/1810/244367/8/thesis.pdf.txt ; https://www.repository.cam.ac.uk/bitstream/1810/244367/9/thesis.pdf.jpg

University of Cambridge

18. McMahon, Brendan. Deformation mechanisms beneath shallow foundations.

Degree: PhD, 2013, University of Cambridge

URL: https://doi.org/10.17863/CAM.14036 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.567851

► Shallow foundations can provide the most economical solution for supporting small-scale structures. The design approach is quite simple considering the ultimate bearing capacity and working-load… (more)

▼ Shallow foundations can provide the most economical solution for supporting small-scale structures. The design approach is quite simple considering the ultimate bearing capacity and working-load settlement. Research has shown that settlement calculations, determined using a linear-elastic approach, usually govern the design but this approach is inappropriate because soil is highly non-linear, even at small strains. The result is that signifi cant discrepancies are observed between predicted and actual settlements. This uncertainty has seen the development of settlement-based approaches such as Mobilisable Strength Design (MSD). MSD uses an assumed undrained mechanism and accounts for soil non-linearity by scaling a triaxial stress-strain curve to make direct predictions of footing load-settlement behaviour. Centrifuge experiments were conducted to investigate the mechanisms governing the settlement of shallow circular foundations on clay and saturated sand models. Clay model tests were performed on soft or rm kaolin beds, depending on its pre-consolidation. Sand model tests were performed on relatively loose Hostun sand saturated with methyl-cellulose to slow consolidation. One-dimensional actuators were developed to apply footing loads through dead-weight or pneumatic loading. A Perspex window in the centrifuge package allowed digital images to be captured of a central cross-section, during and after footing loading. These were used to deduce soil displacements by Particle Image Velocimetry which were consistent with footing settlements measured directly. Deformation mechanisms are presented for undrained penetration, consolidation due to transient flow, as measured by pore pressure transducers, and creep. A technique was developed for discriminating consolidation settlements from the varying rates of short and long-term creep of clay models. Using MSD, a method for predicting the undrained penetration of a spread foundation on clay was proposed, using database results alone, which then provided estimates of creep and consolidation settlements that follow. The importance of the undrained penetration necessitated further investigation by using the observed undrained mechanism as the basis of an ellipsoidal cavity expansion model. An upper-bound energy approach was used to determine the load-settlement behaviour of circular shallow foundations on linear-elastic and non-linear clays, with yield defined using the von Mises' yield criterion. Linear-elastic soil results were consistent with those obtained from nite element analyses. The non-linear model, as described by a power-law, showed good agreement with both centrifuge experiment results and some real case histories. The single design curve developed through this model for normalised footing pressure and settlement could be used by practising engineers based on existing soil correlations or site investigations.

Subjects/Keywords: 620; Circular shallow foundations; Centrifuge; Clay; Sand; Load-settlement; Cavity expansion; Non-linear

Record Details Similar Records Cite « Share

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

McMahon, B. (2013). Deformation mechanisms beneath shallow foundations. (Doctoral Dissertation). University of Cambridge. Retrieved from https://doi.org/10.17863/CAM.14036 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.567851

Chicago Manual of Style (16^th Edition):

McMahon, Brendan. “Deformation mechanisms beneath shallow foundations.” 2013. Doctoral Dissertation, University of Cambridge. Accessed February 26, 2021. https://doi.org/10.17863/CAM.14036 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.567851.

MLA Handbook (7^th Edition):

McMahon, Brendan. “Deformation mechanisms beneath shallow foundations.” 2013. Web. 26 Feb 2021.

Vancouver:

McMahon B. Deformation mechanisms beneath shallow foundations. [Internet] [Doctoral dissertation]. University of Cambridge; 2013. [cited 2021 Feb 26]. Available from: https://doi.org/10.17863/CAM.14036 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.567851.

Council of Science Editors:

McMahon B. Deformation mechanisms beneath shallow foundations. [Doctoral Dissertation]. University of Cambridge; 2013. Available from: https://doi.org/10.17863/CAM.14036 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.567851

19. Doncel, Josu. Efficiency of distributed queueing games and of path discovery algorithms : Efficacité des jeux en files d'attente distribués et des algorithmes de découvert de chemin.

Degree: Docteur es, Automatique et Informatique, 2015, Toulouse, INSA

URL: http://www.theses.fr/2015ISAT0007

►

Cette thèse porte sur l'efficacité des algorithmes distribués de partage des ressources et des algorithmes de découvert de chemin en ligne. Dans la première partie… (more)

▼

Cette thèse porte sur l'efficacité des algorithmes distribués de partage des ressources et des algorithmes de découvert de chemin en ligne. Dans la première partie de la thèse, nous analysons un jeu dans lequel les utilisateurs paient pour utiliser une ressource partagée. La ressource allouée à un utilisateur est directement proportionnel à son paiement. Chaque utilisateur veut minimiser son paiement en assurant une certaine qualité de service. Ce problème est modélisé comme un jeu non-coopératif de partage des ressources. A cause du manque des expressions analytiques de la discipline de file d'attente sous-jacente, nous pouvons résoudre le jeu que sous certaines hypothèses. Pour le cas général, nous développons une approximation basée sur un résultat fort trafic et nous validons la précision de l'approximation numériquement.Dans la deuxième partie, nous étudions l'efficacité des jeux de balance de charge, c'est à dire, nous comparons la perte de performance de routage non coopératif décentralisé avec un routage centralisé. Nous montrons que le PoA est une mesure très pessimiste car il est atteint que dans des cas pathologiques. Dans la plupart des scénarios, les implémentations distribués de balance de charge effectuent presque aussi bien que la mise en œuvre centralisée optimale.Dans la dernière partie de la thèse, nous analysons problème de découverte chemin optimal dans les graphes complets. En ce problème, les valeurs des arêtes sont inconnues, mais peuvent être interrogés. Pour une fonction donnée qui est appliquée à des chemins, l'objectif est de trouver un meilleur chemin de valeur à partir d'une source vers une destination donnée interrogation le plus petit nombre de bords. Nous vous proposons le rapport de requête en tant que mesure de l'efficacité des algorithmes qui permettent de résoudre ce problème. Nous prouvons une limite inférieure pour ne importe quel algorithme qui résout ce problème et nous avons proposé un algorithme avec un rapport de requête strictement inférieure à 2.

This thesis deals with the efficiency of distributed resource sharing algorithms and of online path discovery algorithms. In the first part of the thesis, we analyse a game in which users pay for using a shared resource. The allocated resource to a user is directly proportional to its payment. Each user wants to minimize its payment while ensuring a certain quality of service. This problem is modelled as a non-cooperative resource-sharing game. Due to lack of analytical expressions for the underlying queuing discipline, we are able to give the solution of the game only under some assumptions. For the general case, we develop an approximation based on a heavy-traffic result and we validate the accuracy of the approximation numerically. In the second part, we study the efficiency of load balancing games, i.e., we compare the loss in performance of noncooperative decentralized routing with a centralized routing. We show that the PoA is very pessimistic measure since it is achieved in only pathological cases. In most scenarios,…

Advisors/Committee Members: Brun, Olivier (thesis director), Prabhu, Balakrishna Jitendra (thesis director).

Subjects/Keywords: Theorie de jeux; Efficacité; Load-balancing; Files d'attente; Algorithmes; Game theory; Algorithms; Efficiency; Load-balancing; Queues; 004

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Doncel, J. (2015). Efficiency of distributed queueing games and of path discovery algorithms : Efficacité des jeux en files d'attente distribués et des algorithmes de découvert de chemin. (Doctoral Dissertation). Toulouse, INSA. Retrieved from http://www.theses.fr/2015ISAT0007

Chicago Manual of Style (16^th Edition):

Doncel, Josu. “Efficiency of distributed queueing games and of path discovery algorithms : Efficacité des jeux en files d'attente distribués et des algorithmes de découvert de chemin.” 2015. Doctoral Dissertation, Toulouse, INSA. Accessed February 26, 2021. http://www.theses.fr/2015ISAT0007.

MLA Handbook (7^th Edition):

Doncel, Josu. “Efficiency of distributed queueing games and of path discovery algorithms : Efficacité des jeux en files d'attente distribués et des algorithmes de découvert de chemin.” 2015. Web. 26 Feb 2021.

Vancouver:

Doncel J. Efficiency of distributed queueing games and of path discovery algorithms : Efficacité des jeux en files d'attente distribués et des algorithmes de découvert de chemin. [Internet] [Doctoral dissertation]. Toulouse, INSA; 2015. [cited 2021 Feb 26]. Available from: http://www.theses.fr/2015ISAT0007.

Council of Science Editors:

Doncel J. Efficiency of distributed queueing games and of path discovery algorithms : Efficacité des jeux en files d'attente distribués et des algorithmes de découvert de chemin. [Doctoral Dissertation]. Toulouse, INSA; 2015. Available from: http://www.theses.fr/2015ISAT0007

20. Andersson, Patrik. Low Loss Articulated Hauler Axle : A Conceptual Study.

Degree: Engineering Sciences and Mathematics, 2017, Luleå University of Technology

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-63842

► Volvo Construction Equipment is highly regarded for robust products, but with an increasing competition in their market, development of the product portfolio is more… (more)

▼ Volvo Construction Equipment is highly regarded for robust products, but with an increasing competition in their market, development of the product portfolio is more important than ever. One step being carried out is to reduce losses in powertrains and increase the fuel efficiency for solutions such as articulated haulers and wheel loaders. This would eventually lower the fuel costs and emissions for the end customer. With this development, Volvo CE could strengthen their position in the market while also contributing to reducing the construction industry's environmental impact. By investigating the front bogie axle of the recently introduced hauler, Volvo A60H, important information about possible reductions and the distribution of the current losses were found. The investigation focused on a front bogie axle, but some of the results are applicable for other applications such as wheel loaders as well, since a lot of the technology in the axles are similar. A conceptual study was performed where completely new ideas were generated, such as implementing a dry sump system in the axle, as well as ideas for improving the subcomponents currently found in the axle. Two cases were presented for the evaluation of concepts, one with a fully loaded dump body and low speeds, and one with an unloaded dump body and a wider speed interval. The concepts were later evaluated using calculation tools such as MATLAB and a Simulink-model was created for the losses in the axle. When combining concepts that reduces load dependent losses, a potential reduction of 64% of the axle's total losses was achieved for the case with a full dump body. The largest improvement found for the load independent losses was 8% with an unloaded hauler and the highest speed investigated, 50 km/h. A dry sump system improves the axle's efficiency with 45% in optimal working conditions, but was found to lower the efficiency at other conditions. Room for improvement of axle losses currently exists both for load dependent and load independent losses. The evaluation performed pointed towards the load dependent losses being the largest influence on the total losses, even with an unloaded dump body and high speeds. This is an interesting observation since a lot of work at Volvo CE has revolved around reducing the load independent losses since these are easier to affect with different lubrication levels and rotational speeds. A test methodology for load dependent losses should be implemented in order to validate the results of this thesis work, and also to aid further development at Volvo CE.

Subjects/Keywords: articulated hauler; low loss axle; load dependent; load independent; dry sump; front bogie; conceptual study; construction equipment; efficiency; Mechanical Engineering; Maskinteknik

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APA (6^th Edition):

Andersson, P. (2017). Low Loss Articulated Hauler Axle : A Conceptual Study. (Thesis). Luleå University of Technology. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-63842

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Andersson, Patrik. “Low Loss Articulated Hauler Axle : A Conceptual Study.” 2017. Thesis, Luleå University of Technology. Accessed February 26, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-63842.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Andersson, Patrik. “Low Loss Articulated Hauler Axle : A Conceptual Study.” 2017. Web. 26 Feb 2021.

Vancouver:

Andersson P. Low Loss Articulated Hauler Axle : A Conceptual Study. [Internet] [Thesis]. Luleå University of Technology; 2017. [cited 2021 Feb 26]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-63842.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Andersson P. Low Loss Articulated Hauler Axle : A Conceptual Study. [Thesis]. Luleå University of Technology; 2017. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-63842

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

21. Zhang, Yannan. Accounting for Remaining Injected Fracturing Fluid.

Degree: 2013, Texas Digital Library

URL: http://hdl.handle.net/1969; http://hdl.handle.net/2249.1/66811

► The technology of multi-stage fracturing of horizontal wells made the development of shale gas reservoirs become greatly successful during the past decades. A large amount… (more)

Subjects/Keywords: Load Recovery

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APA (6^th Edition):

Zhang, Y. (2013). Accounting for Remaining Injected Fracturing Fluid. (Thesis). Texas Digital Library. Retrieved from http://hdl.handle.net/1969; http://hdl.handle.net/2249.1/66811

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Zhang, Yannan. “Accounting for Remaining Injected Fracturing Fluid.” 2013. Thesis, Texas Digital Library. Accessed February 26, 2021. http://hdl.handle.net/1969; http://hdl.handle.net/2249.1/66811.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Zhang, Yannan. “Accounting for Remaining Injected Fracturing Fluid.” 2013. Web. 26 Feb 2021.

Vancouver:

Zhang Y. Accounting for Remaining Injected Fracturing Fluid. [Internet] [Thesis]. Texas Digital Library; 2013. [cited 2021 Feb 26]. Available from: http://hdl.handle.net/1969; http://hdl.handle.net/2249.1/66811.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Zhang Y. Accounting for Remaining Injected Fracturing Fluid. [Thesis]. Texas Digital Library; 2013. Available from: http://hdl.handle.net/1969; http://hdl.handle.net/2249.1/66811

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Delft University of Technology

22. Van Wijk, M.P.R. (author). The optimisation of the energy-related cost function for the Delft Shoulder & Elbow Model.

Degree: 2011, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:cdb4a4fb-e402-4592-98ee-ccb38346f9b8

►

For inverse-dynamic models cost functions account for the load sharing problem that arises when modelling the musculoskeletal system. This study focuses on the optimisation of… (more)

Subjects/Keywords: load sharing

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APA (6^th Edition):

Van Wijk, M. P. R. (. (2011). The optimisation of the energy-related cost function for the Delft Shoulder & Elbow Model. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:cdb4a4fb-e402-4592-98ee-ccb38346f9b8

Chicago Manual of Style (16^th Edition):

Van Wijk, M P R (author). “The optimisation of the energy-related cost function for the Delft Shoulder & Elbow Model.” 2011. Masters Thesis, Delft University of Technology. Accessed February 26, 2021. http://resolver.tudelft.nl/uuid:cdb4a4fb-e402-4592-98ee-ccb38346f9b8.

MLA Handbook (7^th Edition):

Van Wijk, M P R (author). “The optimisation of the energy-related cost function for the Delft Shoulder & Elbow Model.” 2011. Web. 26 Feb 2021.

Vancouver:

Van Wijk MPR(. The optimisation of the energy-related cost function for the Delft Shoulder & Elbow Model. [Internet] [Masters thesis]. Delft University of Technology; 2011. [cited 2021 Feb 26]. Available from: http://resolver.tudelft.nl/uuid:cdb4a4fb-e402-4592-98ee-ccb38346f9b8.

Council of Science Editors:

Van Wijk MPR(. The optimisation of the energy-related cost function for the Delft Shoulder & Elbow Model. [Masters Thesis]. Delft University of Technology; 2011. Available from: http://resolver.tudelft.nl/uuid:cdb4a4fb-e402-4592-98ee-ccb38346f9b8

Oklahoma State University

23. Morrison, Alex Kennedy. Analysis of Loads Paths in Residential Houses.

Degree: Civil & Environmental Engineering, 2014, Oklahoma State University

URL: http://hdl.handle.net/11244/15028

► The Moore tornado on May 20th 2013 caused severe damage to numerous residential homes. A research team was sent to rate the damage and collect… (more)

Subjects/Keywords: load paths

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APA (6^th Edition):

Morrison, A. K. (2014). Analysis of Loads Paths in Residential Houses. (Thesis). Oklahoma State University. Retrieved from http://hdl.handle.net/11244/15028

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Morrison, Alex Kennedy. “Analysis of Loads Paths in Residential Houses.” 2014. Thesis, Oklahoma State University. Accessed February 26, 2021. http://hdl.handle.net/11244/15028.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Morrison, Alex Kennedy. “Analysis of Loads Paths in Residential Houses.” 2014. Web. 26 Feb 2021.

Vancouver:

Morrison AK. Analysis of Loads Paths in Residential Houses. [Internet] [Thesis]. Oklahoma State University; 2014. [cited 2021 Feb 26]. Available from: http://hdl.handle.net/11244/15028.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Morrison AK. Analysis of Loads Paths in Residential Houses. [Thesis]. Oklahoma State University; 2014. Available from: http://hdl.handle.net/11244/15028

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Lithuanian University of Agriculture

24. Juostas, Antanas. Vidutinės galios traktorių variklių apkrovos, degalų sąnaudų ir deginių emisijos racionali sąveika.

Degree: PhD, Environmental Engineering and Land Management, 2013, Lithuanian University of Agriculture

URL: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20130103_194650-55209 ;

►

Pirmą kartą Lietuvoje traktorių variklių darbo ir degalų sąnaudų efektyvumo bei deginių emisijos vertinimui panaudota šiuolaikiškų traktorių variklių valdymo elektroninės sistemos mikroprocesoriuose sukaupta eksploatacinių darbo… (more)

▼

Pirmą kartą Lietuvoje traktorių variklių darbo ir degalų sąnaudų efektyvumo bei deginių emisijos vertinimui panaudota šiuolaikiškų traktorių variklių valdymo elektroninės sistemos mikroprocesoriuose sukaupta eksploatacinių darbo parametrų duomenų bazė. Traktorių valdymo ir kontrolės mikroprocesoriuose kaupiamos duomenų bazės pagrindu nustatyti daugumoje žemės ūkyje naudojami traktorių variklių darbo režimai. Sudaryta traktorių variklių darbo režimų, degalų naudojimo efektyvumo ir oro taršos variklio išmetamomis dujomis vertinimo metodika, panaudojant mikroprocesoriuose kaupiamų duomenų bazę. Ištirtos traktorių mikroprocesoriuose kaupiamų darbo parametrų pritaikymo traktorių variklio darbo režimų, degalų naudojimo efektyvumo ir oro taršos variklio išmetamomis dujomis vertinimo galimybės. Ištirtas degalų naudojimo efektyvumas ir deginių emisija traktorių eksploatacijos laikotarpiu bei sėjos ir arimo darbuose. Eksploatacijos laikotarpiu bei atliekant lauko darbus nustatytas apskaičiuotos deginių emisijos vertinimo tinkamumas šiuo metu traktorių varikliams taikomiems deginių emisijos kontrolės standartams. Siūloma metodika gali būti panaudota žemės ūkyje dirbančių traktorių deginių emisijos bei degalų sąnaudų vertinimui realiu darbo metu. Taip pat, gauti rezultatai bei taikomi metodai gali būti panaudoti traktorių darbo kokybės rodiklių tokių kaip degalų sąnaudų, deginių emisijos, įdirbimo gylio ir pan., lauko žemėlapių sudarymui.

First time in Lithuania tractors’ engine, fuel efficiency and exhaust gas emission estimated by using data base collected in the modern tractor engine management electronic microprocessors. The majority of agricultural tractors engine operating modes was determined by using data base collected in tractor management and control microprocessors. The evaluation methodology of the tractor engine operating modes, fuel efficiency and exhaust gas emissions was made. Investigated tractor engine operating modes, fuel efficiency and exhaust gas emissions assessment possibilities by using tractor operating parameters stored in their microprocessors. Fuel efficiency and exhaust emissions during tractor operation period, sowing and plowing jobs were investigated. Evaluated adequacy of calculated investigated tractors engine exhaust emission during operation period and field work with applicable exhaust emission control standards. The proposed methodology can be used for evaluation of the agriculture tractor exhaust emissions and fuel consumption during operation in real time. Also, the obtained results and methods can be used for the tractor work quality indicators such as fuel consumption, exhaust emissions, tillage depth, and so etc. field mapping creation.

Advisors/Committee Members: Janulevičius, Algirdas (Doctoral dissertation supervisor), Raila, Algirdas (Doctoral dissertation opponent), Lebedevas, Sergejus (Doctoral dissertation opponent).

Subjects/Keywords: Variklio apkrova; Degalų sąnaudos; Deginių emisija; Traktorius; Engine load; Fuel consumption; Exhaust gas emission; Tractor

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Juostas, Antanas. (2013). Vidutinės galios traktorių variklių apkrovos, degalų sąnaudų ir deginių emisijos racionali sąveika. (Doctoral Dissertation). Lithuanian University of Agriculture. Retrieved from http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20130103_194650-55209 ;

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Chicago Manual of Style (16^th Edition):

Juostas, Antanas. “Vidutinės galios traktorių variklių apkrovos, degalų sąnaudų ir deginių emisijos racionali sąveika.” 2013. Doctoral Dissertation, Lithuanian University of Agriculture. Accessed February 26, 2021. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20130103_194650-55209 ;.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

MLA Handbook (7^th Edition):

Juostas, Antanas. “Vidutinės galios traktorių variklių apkrovos, degalų sąnaudų ir deginių emisijos racionali sąveika.” 2013. Web. 26 Feb 2021.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Vancouver:

Juostas, Antanas. Vidutinės galios traktorių variklių apkrovos, degalų sąnaudų ir deginių emisijos racionali sąveika. [Internet] [Doctoral dissertation]. Lithuanian University of Agriculture; 2013. [cited 2021 Feb 26]. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20130103_194650-55209 ;.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Council of Science Editors:

Juostas, Antanas. Vidutinės galios traktorių variklių apkrovos, degalų sąnaudų ir deginių emisijos racionali sąveika. [Doctoral Dissertation]. Lithuanian University of Agriculture; 2013. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20130103_194650-55209 ;

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Texas Tech University

25. Luna, Miguel. Burning season effect on four southern Chihuahuan desert plants.

Degree: Natural Resources, 2009, Texas Tech University

URL: http://hdl.handle.net/2346/19382

► Use of prescribed fire to manage undesirable vegetation in the Chihuahuan Desert of Mexico, promises acceptable results, but information on plants responses to different weather… (more)

▼ Use of prescribed fire to manage undesirable vegetation in the Chihuahuan Desert of Mexico, promises acceptable results, but information on plants responses to different weather conditions and fuel load availabilities is lacking in Mexico. This study investigated the effect of three burning seasons with two fuel load simulations and two plants size on plant mortality and changes in basal area of four native species of southern Chihuahuan Desert. The study was conducted in the Mexican High Plateau in Jalisco, Mexico during two consecutive years, 2005 and 2006, in a shortgrass prairie of blue grama (Bouteloua gracilis) with problematical populations of broomweed (Isocoma venetus), brickellbush (Brickellia spinulosa) and broomgrass (Muhlembergia rigida). Fire environment was simulated using a portable propane burner calibrated to simulate time-temperature reached with 1,700 and 2,800 kg/ha fine fuel load. Size of plant was determined by height and canopy diameter in shrubs, and indicial area diameter in grasses. Shrubs with a minimum height of 25 cm and canopy diameter of 31 cm were classed as large plants. Grasses with a basal area diameter of 10 cm were classed as large plants. Plants with measurements less than these were placed in the small plant group. For each species, 50 plants were randomly treated each season at each fuel load and plant size. Plants were identified with numbered tags to evaluate mortality and basal area changes in subsequent growing season. As control, 50 plant of each species and size received no fire treatment. Plants with no live tillers one year after treatment were assumed to be dead. Basal area change was estimated based in number of pixels/cm2, using vertical photos and the Adobe Photoshop Software. Statistical analysis was performed with the GLM procedure in SAS. Mortality of blue grama plants was affected significantly by season of burning, fuel load simulation, and plant size (P<0.05). Small blue grama plants were significantly (P<0.05) more affected than large plants, mainly after spring and summer burns. Mortality of broomgrass muhly was slightly affected by burning treatments in either evaluation year, with average mortality of 1% and 2% for 2005 and 2006. Brickellbush mortality was significantly affected by burning season (P<0.05), and plant size (P<0.05). Spring and winter burns were the most detrimental seasons for small brickellbush plants. Broomweed plants were severely affected (P<0.05) by all burn treatments, regardless of fuel load simulation and plant size, with 82% average mortality. Spring and summer burning with high fuel load simulations reduced basal area of large blue grama plants. However these changes were similar (P>0.05) to unburned plants that decreased 8%. Winter burning with high fuel load had a positive effect (P<0.05) on basal area of large blue grama plants, with an increase of 37%. Small blue grama plants had a positive response to all burning treatments regardless of fuel load simulations, with average increases of 80%, 41%, and 31% for… Advisors/Committee Members: Britton, Carlton M. (Committee Chair).

Subjects/Keywords: Chihuahuan; Fuel load; Fire; Desert; Simulations

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APA (6^th Edition):

Luna, M. (2009). Burning season effect on four southern Chihuahuan desert plants. (Thesis). Texas Tech University. Retrieved from http://hdl.handle.net/2346/19382

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Luna, Miguel. “Burning season effect on four southern Chihuahuan desert plants.” 2009. Thesis, Texas Tech University. Accessed February 26, 2021. http://hdl.handle.net/2346/19382.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Luna, Miguel. “Burning season effect on four southern Chihuahuan desert plants.” 2009. Web. 26 Feb 2021.

Vancouver:

Luna M. Burning season effect on four southern Chihuahuan desert plants. [Internet] [Thesis]. Texas Tech University; 2009. [cited 2021 Feb 26]. Available from: http://hdl.handle.net/2346/19382.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Luna M. Burning season effect on four southern Chihuahuan desert plants. [Thesis]. Texas Tech University; 2009. Available from: http://hdl.handle.net/2346/19382

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Virginia Tech

26. Pierce, Timothy M. Jr. Mobile Hybrid Power System Theory of Operation.

Degree: MS, Electrical and Computer Engineering, 2016, Virginia Tech

URL: http://hdl.handle.net/10919/78148

► Efficiency is a driving constraint for electrical power systems as global energy demands are ever increasing. Followed by the introduction of diesel generators, electricity has… (more)

Subjects/Keywords: power factor correction; load profile; energy storage; mobile hybrid power system; fuel consumption

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APA (6^th Edition):

Pierce, T. M. J. (2016). Mobile Hybrid Power System Theory of Operation. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/78148

Chicago Manual of Style (16^th Edition):

Pierce, Timothy M Jr. “Mobile Hybrid Power System Theory of Operation.” 2016. Masters Thesis, Virginia Tech. Accessed February 26, 2021. http://hdl.handle.net/10919/78148.

MLA Handbook (7^th Edition):

Pierce, Timothy M Jr. “Mobile Hybrid Power System Theory of Operation.” 2016. Web. 26 Feb 2021.

Vancouver:

Pierce TMJ. Mobile Hybrid Power System Theory of Operation. [Internet] [Masters thesis]. Virginia Tech; 2016. [cited 2021 Feb 26]. Available from: http://hdl.handle.net/10919/78148.

Council of Science Editors:

Pierce TMJ. Mobile Hybrid Power System Theory of Operation. [Masters Thesis]. Virginia Tech; 2016. Available from: http://hdl.handle.net/10919/78148

University of New South Wales

27. Roff, Adam. Floristics and structure: object-based, hyperspectral remote sensing of native vegetation.

Degree: Biological, Earth & Environmental Sciences, 2015, University of New South Wales

URL: http://handle.unsw.edu.au/1959.4/54474 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:35028/SOURCE02?view=true

► An underlying premise of any segmentation method is that spectral similarity and thematic similarity are synonymous. This assumption holds true for image objects at an… (more)

▼ An underlying premise of any segmentation method is that spectral similarity and thematic similarity are synonymous. This assumption holds true for image objects at an individual tree crown scale and they can be classified with a degree of accuracy. However, at coarser spatial scales, a large patch of vegetation can encompass a variety of thematic attributes. Mapping native vegetation using remote sensing suffers from an inability to make meaningful predictions through a change in scale.I propose that heterogeneous vegetation needs to be analysed across multiple scales to categorise it as a vegetation community. A multi-scale, object-based, hierarchical approach was introduced to generalise floristic data collected at the plot scale to a vegetation community map using remote sensing. This framework uses the cover and abundance of classified tree crown objects to inform the classification of larger patches of vegetation. Community scale image objects can then be named using the same hierarchical framework used by ecologists in plant ecology.Machine learning classification algorithms and patch scale segmentation algorithms were reviewed and benchmarked for this application. A crown delineation algorithm was formulated as well as a new way to combine lidar with optical imagery. The scope of this thesis was limited to three sensors: the HyMap hyperspectral airborne scanner, small footprint lidar, and the multi-spectral SPOT-5 satellite. To ensure that the results are relevant, the fieldwork for this thesis was based largely on operational standards. The result was a vegetation map classified on cover and abundance of dominant crown species. The extra resources required for individual tree crown surveys and the difficulty of analysis in highly diverse ecosystems are the main limitations. Vegetation structure was assessed by quantifying forest fuel load using remote sensing. The correlation between field derived attributes and vegetation indices was stronger when narrow band hyperspectral vegetation indices were used. Small footprint lidar successfully penetrated the canopy and offered quantitative information about the structure of the understorey. However, the total fuel load assessed in the field was dominated by leaf litter component in wet forest, which was problematic to quantify with remote sensing. Advisors/Committee Members: Taylor, Geoffrey, Biological, Earth & Environmental Sciences, Faculty of Science, UNSW.

Subjects/Keywords: Multi; Object; Vegetation; Mapping; Delineation; Hyperspectral; Crown; Fuel load; Fire; Australian; Scale; Remote sensing; Lidar

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Roff, A. (2015). Floristics and structure: object-based, hyperspectral remote sensing of native vegetation. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/54474 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:35028/SOURCE02?view=true

Chicago Manual of Style (16^th Edition):

Roff, Adam. “Floristics and structure: object-based, hyperspectral remote sensing of native vegetation.” 2015. Doctoral Dissertation, University of New South Wales. Accessed February 26, 2021. http://handle.unsw.edu.au/1959.4/54474 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:35028/SOURCE02?view=true.

MLA Handbook (7^th Edition):

Roff, Adam. “Floristics and structure: object-based, hyperspectral remote sensing of native vegetation.” 2015. Web. 26 Feb 2021.

Vancouver:

Roff A. Floristics and structure: object-based, hyperspectral remote sensing of native vegetation. [Internet] [Doctoral dissertation]. University of New South Wales; 2015. [cited 2021 Feb 26]. Available from: http://handle.unsw.edu.au/1959.4/54474 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:35028/SOURCE02?view=true.

Council of Science Editors:

Roff A. Floristics and structure: object-based, hyperspectral remote sensing of native vegetation. [Doctoral Dissertation]. University of New South Wales; 2015. Available from: http://handle.unsw.edu.au/1959.4/54474 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:35028/SOURCE02?view=true

University of California – Irvine

28. Davaslioglu, Kemal. Energy Efficiency and Load Balancing in Next-Generation Wireless Cellular Networks.

Degree: Electrical and Computer Engineering, 2015, University of California – Irvine

URL: http://www.escholarship.org/uc/item/3gq7n4h2

► This dissertation focuses on the resource allocation problem in next-generation cellular wireless networks. Our goal is to design and evaluate algorithms and procedures to provide… (more)

▼ This dissertation focuses on the resource allocation problem in next-generation cellular wireless networks. Our goal is to design and evaluate algorithms and procedures to provide a balanced load and to improve the energy-efficiency of these networks, while satisfying the quality-of-service constraints of the users. The contributions of this dissertation are (i) a new handover policy to balance the load in Long Term Evolution (LTE) Heterogeneous Networks (HetNets), (ii) an analytical characterization of the efficiency and fairness trade-off of LTE uplink schedulers, and (iii) energy-efficient resource allocation algorithms for LTE HetNets with quality-of-service constraints (QoS). First, we address the load balancing problem in HetNets deployments. We focus on the cell selection and handover policies as more base stations with different properties and functionalities are deployed. Conventional methods such as the strongest cell approach, used in single-layer network architectures, do not offer balanced loading or optimal performance for the HetNets due to the transmit power differences, backhaul, and access constraints of different base station types.Therefore, we propose a new handover decision policy that employs cell breathing, which dynamically adjusts the cell coverage regions based on the uplink interference measurements and current system load. The proposed policy also contributes to the self-adaptive and self-organization goals of the next-generation cellular systems. Next, we investigate the uplink resource scheduling problem in single carrier frequency-domain multiple access systems. We present an efficient implementation method that translates these scheduling problems into set partitioning problems. Then, we discuss a family of utility functions that enable us to investigate the performance of different frequency domain schedulers such as the sum-rate maximization, proportional fair, and max-min fair schedulers. We use the price of fairness as a metric to analytically quantify the efficiency and fairness trade-offs in the schedulers and provide several upper bounds. We believe that this type of analysis can provide guidelines for the network operators to control the efficiency and fairness trade-off as the data traffic grows. Finally, we investigate the multi-cell multi-carrier network energy efficiency problem where we propose utility-based energy-efficient resource allocation algorithms. We consider a linearized load-adaptive power consumption model at the base stations. We study the interference pricing mechanisms which include the inter-cell interference contributions and penalize the transmissions based on the interference they create. We propose two types of power control algorithms. First, we propose an iterative multi-level water-filling algorithm for multi-cell wireless networks. Second, we employ the gradient ascent method to control the transmit power of base stations. Both of these frameworks are extended to include QoS constraints such as the minimum rate constraints for each user. We present…

Subjects/Keywords: Electrical engineering; Operations research; Energy Efficiency; Handover Policies; Load Balancing; Power Control; Pricing; Scheduling

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Davaslioglu, K. (2015). Energy Efficiency and Load Balancing in Next-Generation Wireless Cellular Networks. (Thesis). University of California – Irvine. Retrieved from http://www.escholarship.org/uc/item/3gq7n4h2

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Davaslioglu, Kemal. “Energy Efficiency and Load Balancing in Next-Generation Wireless Cellular Networks.” 2015. Thesis, University of California – Irvine. Accessed February 26, 2021. http://www.escholarship.org/uc/item/3gq7n4h2.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Davaslioglu, Kemal. “Energy Efficiency and Load Balancing in Next-Generation Wireless Cellular Networks.” 2015. Web. 26 Feb 2021.

Vancouver:

Davaslioglu K. Energy Efficiency and Load Balancing in Next-Generation Wireless Cellular Networks. [Internet] [Thesis]. University of California – Irvine; 2015. [cited 2021 Feb 26]. Available from: http://www.escholarship.org/uc/item/3gq7n4h2.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Davaslioglu K. Energy Efficiency and Load Balancing in Next-Generation Wireless Cellular Networks. [Thesis]. University of California – Irvine; 2015. Available from: http://www.escholarship.org/uc/item/3gq7n4h2

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

NSYSU

29. Chen, Yin-Chih. Optimal Design and Control of Interconnected Transformers for Photovoltaic Generation Systems Considering Reliability Criterion.

Degree: Master, Electrical Engineering, 2017, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0728117-134259

► Photovoltaic Generation System (PVGS) can be divided into small-scale and large-scale PVGSs. A small-scale PVGS is composed of photovoltaic panels and inverters and is directly… (more)

▼ Photovoltaic Generation System (PVGS) can be divided into small-scale and large-scale PVGSs. A small-scale PVGS is composed of photovoltaic panels and inverters and is directly interconnected to loads or low-voltage power grids. A large-scale PVGS is composed of many small-scale PVGSs and then is interconnected to high-voltage power grids by transformers. The PVGS devices are usually operated at light loads due to the output characteristic of PVGS. The transformers have a poor light-load conversion efficiency; therefore, it will cause significant energy loss for a large-scale PVGS in the long run. In addition, PVGS output is mainly affected by solar irradiances that are not continuous and rapid changes, the PVGS output is difficult to accurately predict too. An optimal design and control of interconnected transformers for PVGSs considering reliability criterion is proposed in this thesis. A modified scenario reduction method is adopted in this thesis to find out the representative data patterns of PVGS outputs. The proposed scenario reduction method can be used to reduce the data patterns within acceptable accuracy; therefore, the analysis speed and accuracy can be improved. To prevent the interconnection failure of PVGS due to a single transformer fault, an optimal design and control of interconnected transformers for PVGSs based on genetic algorithm considering N-1 reliability criterion is implemented. With the proposed design and control, the number and capacity of transformers can be determined. The interconnected transformers can then be scheduled to enhance the light-load conversion efficiency of PVGSs. Simulation results show that 0.6% conversion efficiency improvement can be realized for a PVGS with rated capacity of 3200kWp by the proposed optimal design and control of interconnected transformers. PVGSs with a total rated capacity of 20GWp will be installed in Taiwan in 2025. If the average daily power generation is about 80GWh, then the generation increases of 0.48GWh and 175.2GWh can be obtained daily and yearly respectively. Using the wholesale price of 4.4098 NTD/kWh for PVGS in 2017 in Taiwan as an example, the additional benefit of annual electricity sales is about 7.73 billion NTD. Advisors/Committee Members: Yi-Hua Liu (chair), Tzung-Lin Lee (chair), Kuo-Lung Lian (chair), Jen-Hao Teng (committee member), Shun-Chung Wang (chair).

Subjects/Keywords: Photovoltaic Generation System; Genetic Algorithm; Scenario Reduction; Light-load Conversion Efficiency; N-1 reliability criterion

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Chen, Y. (2017). Optimal Design and Control of Interconnected Transformers for Photovoltaic Generation Systems Considering Reliability Criterion. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0728117-134259

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Chen, Yin-Chih. “Optimal Design and Control of Interconnected Transformers for Photovoltaic Generation Systems Considering Reliability Criterion.” 2017. Thesis, NSYSU. Accessed February 26, 2021. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0728117-134259.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Chen, Yin-Chih. “Optimal Design and Control of Interconnected Transformers for Photovoltaic Generation Systems Considering Reliability Criterion.” 2017. Web. 26 Feb 2021.

Vancouver:

Chen Y. Optimal Design and Control of Interconnected Transformers for Photovoltaic Generation Systems Considering Reliability Criterion. [Internet] [Thesis]. NSYSU; 2017. [cited 2021 Feb 26]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0728117-134259.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Chen Y. Optimal Design and Control of Interconnected Transformers for Photovoltaic Generation Systems Considering Reliability Criterion. [Thesis]. NSYSU; 2017. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0728117-134259

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University

30. Fu, Jianxi. A Non-intrusive Method for Mechanical Measurements in Constant Frequency Electric Motors.

Degree: PhD, Mechanical Engineering, 2018, Texas A&M University

URL: http://hdl.handle.net/1969.1/173683

► Electric motor-driven systems are basic components in most industrial processes. The four motor mechanical measurements of interest that dictate motor performance are shaft torque, shaft… (more)

▼ Electric motor-driven systems are basic components in most industrial processes. The four motor mechanical measurements of interest that dictate motor performance are shaft torque, shaft speed, mechanical power (motor load) and energy conversion efficiency. Torque and speed, along with the input electric power are needed to estimate load and efficiency. Mechanical performance monitoring is an ever-increasing trend, present in many industries. Such monitoring can identify equipment failures, predict system degradation, and monitor overload conditions. It also provides users with a deeper understanding of the operational demands of their machines, which is difficult to diagnose through standard vibration analysis. Nevertheless, it is extremely challenging to measure the in-situ motor shaft torque, and to a lesser extent shaft speed. A comprehensive literature survey indicates that many estimation methods exist for motor mechanical measurements. However, almost all of these methods require at least one of the following: (1) load tests involving measurements of shaft speed and torque at a stable temperature, (2) no-load tests, i.e. with motor mechanically decoupled from driven load, (3) deenergized stator resistance measurements, i.e. with motor electrically disconnected. These three conditions require a level of access to the motor under test not generally acceptable or possible in an industrial environment, i.e. these are the “intrusive” requirements of the mechanical measurement estimation methods. A non-intrusive approach to mechanical measurements is proposed, incorporating the equivalent circuit model of an operating induction motor. The estimation of the mechanical measurements is formulated as a non-linear, constrained optimization problem with the variables to be optimized being the parameters of the equivalent circuit model. The optimization problem iii is solved using the Covariance Matrix Adaptation Evolution Strategy (CMA-ES) method. The required inputs of the proposed method are the three-phase voltage and current phasors and the motor nameplate information. The resulting parameters of the equivalent circuit model and new voltage and current phasors are used to estimate the motor mechanical measurements. Five (5) manufacturer's catalog data sheets, two (2) small motors, 1 HP and 3 HP, and two (2) larger motors, 100 HP and 200 HP, are used to test the proposed approach against direct mechanical measurements of torque and speed. The experimental results demonstrate that the proposed method achieves speed estimates within ±5 RPM of the sensor readings, which is comparable to existing non-intrusive methods. For torque, load and efficiency, the proposed method achieves accuracy within ±2-3% for high (>25%) loads, and up to ±5% errors for low (<25%) loads. The presented shaft torque accuracy is an improvement over existing, nonintrusive techniques and in the case of load and efficiency estimation is an improvement over existing, non-intrusive and even some intrusive techniques. The novel contribution of this… Advisors/Committee Members: Parlos, Alexander (advisor), Kim, Won-Jong (advisor), Rasmussen, Bryan (committee member), Silva-Martinez, Jose (committee member).

Subjects/Keywords: Mechanical measurements; Torque; Speed; Load; Efficiency; Non-intrusive approach; equivalent circuit; CMA-ES

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Fu, J. (2018). A Non-intrusive Method for Mechanical Measurements in Constant Frequency Electric Motors. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/173683

Chicago Manual of Style (16^th Edition):

Fu, Jianxi. “A Non-intrusive Method for Mechanical Measurements in Constant Frequency Electric Motors.” 2018. Doctoral Dissertation, Texas A&M University. Accessed February 26, 2021. http://hdl.handle.net/1969.1/173683.

MLA Handbook (7^th Edition):

Fu, Jianxi. “A Non-intrusive Method for Mechanical Measurements in Constant Frequency Electric Motors.” 2018. Web. 26 Feb 2021.

Vancouver:

Fu J. A Non-intrusive Method for Mechanical Measurements in Constant Frequency Electric Motors. [Internet] [Doctoral dissertation]. Texas A&M University; 2018. [cited 2021 Feb 26]. Available from: http://hdl.handle.net/1969.1/173683.

Council of Science Editors:

Fu J. A Non-intrusive Method for Mechanical Measurements in Constant Frequency Electric Motors. [Doctoral Dissertation]. Texas A&M University; 2018. Available from: http://hdl.handle.net/1969.1/173683

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Open Access Theses and Dissertations