subject:(670)

Durham University

1. Shetwan, Ali Gassim M. Optimum allocation of inspection stations in multistage manufacturing processes by using Max-Min Ant System.

Degree: PhD, 2013, Durham University

URL: http://etheses.dur.ac.uk/7730/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.575766

► In multistage manufacturing processes it is common to locate inspection stations after some or all of the processing workstations. The purpose of the inspection is… (more)

▼ In multistage manufacturing processes it is common to locate inspection stations after some or all of the processing workstations. The purpose of the inspection is to reduce the total manufacturing cost, resulted from unidentified defective items being processed unnecessarily through subsequent manufacturing operations. This total cost is the sum of the costs of production, inspection and failures (during production and after shipment). Introducing inspection stations into a serial multistage manufacturing process, although constituting an additional cost, is expected to be a profitable course of action. Specifically, at some positions the associated inspection costs will be recovered from the benefits realised through the detection of defective items, before wasting additional cost by continuing to process them. In this research, a novel general cost modelling for allocating a limited number of inspection stations in serial multistage manufacturing processes is formulated. In allocation of inspection station (AOIS) problem, as the number of workstations increases, the number of inspection station allocation possibilities increases exponentially. To identify the appropriate approach for the AOIS problem, different optimisation methods are investigated. The MAX-MIN Ant System (MMAS) algorithm is proposed as a novel approach to explore AOIS in serial multistage manufacturing processes. MMAS is an ant colony optimisation algorithm that was designed originally to begin an explorative search phase and, subsequently, to make a slow transition to the intensive exploitation of the best solutions found during the search, by allowing only one ant to update the pheromone trails. Two novel heuristics information for the MMAS algorithm are created. The heuristic information for the MMAS algorithm is exploited as a novel means to guide ants to build reasonably good solutions from the very beginning of the search. To improve the performance of the MMAS algorithm, six local search methods which are well-known and suitable for the AOIS problem are used. Selecting relevant parameter values for the MMAS algorithm can have a great impact on the algorithm’s performance. As a result, a method for tuning the most influential parameter values for the MMAS algorithm is developed. The contribution of this research is, for the first time, a methodology using MMAS to solve the AOIS problem in serial multistage manufacturing processes has been developed. The methodology takes into account the constraints on inspection resources, in terms of a limited number of inspection stations. As a result, the total manufacturing cost of a product can be reduced, while maintaining the quality of the product. Four numerical experiments are conducted to assess the MMAS algorithm for the AOIS problem. The performance of the MMAS algorithm is compared with a number of other methods this includes the complete enumeration method (CEM), rule of thumb, a pure random search algorithm, particle swarm optimisation, simulated annealing and genetic algorithm. The…

Subjects/Keywords: 670

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APA (6^th Edition):

Shetwan, A. G. M. (2013). Optimum allocation of inspection stations in multistage manufacturing processes by using Max-Min Ant System. (Doctoral Dissertation). Durham University. Retrieved from http://etheses.dur.ac.uk/7730/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.575766

Chicago Manual of Style (16^th Edition):

Shetwan, Ali Gassim M. “Optimum allocation of inspection stations in multistage manufacturing processes by using Max-Min Ant System.” 2013. Doctoral Dissertation, Durham University. Accessed January 24, 2021. http://etheses.dur.ac.uk/7730/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.575766.

MLA Handbook (7^th Edition):

Shetwan, Ali Gassim M. “Optimum allocation of inspection stations in multistage manufacturing processes by using Max-Min Ant System.” 2013. Web. 24 Jan 2021.

Vancouver:

Shetwan AGM. Optimum allocation of inspection stations in multistage manufacturing processes by using Max-Min Ant System. [Internet] [Doctoral dissertation]. Durham University; 2013. [cited 2021 Jan 24]. Available from: http://etheses.dur.ac.uk/7730/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.575766.

Council of Science Editors:

Shetwan AGM. Optimum allocation of inspection stations in multistage manufacturing processes by using Max-Min Ant System. [Doctoral Dissertation]. Durham University; 2013. Available from: http://etheses.dur.ac.uk/7730/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.575766

University of Sheffield

2. McLeay, T. E. Unsupervised monitoring of machining processes.

Degree: PhD, 2016, University of Sheffield

URL: http://etheses.whiterose.ac.uk/16556/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.706041

► Machining processes, such as milling, drilling, turning and grinding, concern the removal of material from a workpiece using a cutting tool. These processes are sensitive… (more)

Subjects/Keywords: 670

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APA (6^th Edition):

McLeay, T. E. (2016). Unsupervised monitoring of machining processes. (Doctoral Dissertation). University of Sheffield. Retrieved from http://etheses.whiterose.ac.uk/16556/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.706041

Chicago Manual of Style (16^th Edition):

McLeay, T E. “Unsupervised monitoring of machining processes.” 2016. Doctoral Dissertation, University of Sheffield. Accessed January 24, 2021. http://etheses.whiterose.ac.uk/16556/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.706041.

MLA Handbook (7^th Edition):

McLeay, T E. “Unsupervised monitoring of machining processes.” 2016. Web. 24 Jan 2021.

Vancouver:

McLeay TE. Unsupervised monitoring of machining processes. [Internet] [Doctoral dissertation]. University of Sheffield; 2016. [cited 2021 Jan 24]. Available from: http://etheses.whiterose.ac.uk/16556/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.706041.

Council of Science Editors:

McLeay TE. Unsupervised monitoring of machining processes. [Doctoral Dissertation]. University of Sheffield; 2016. Available from: http://etheses.whiterose.ac.uk/16556/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.706041

University of Bristol

3. Lukaszewicz, Dirk Hans-Joachim Adrian. Optimisation of high-speed automated layup of thermoset carbon-fibre preimpregnates.

Degree: PhD, 2011, University of Bristol

URL: http://hdl.handle.net/1983/d3ba26e7-7a56-4a95-bc68-9df2c27326ad

► Automated lay-up of prepreg is slowly replacing manual layup during the production of composite parts for aerospace, automotive and renewable energy applications. This is driven… (more)

▼ Automated lay-up of prepreg is slowly replacing manual layup during the production of composite parts for aerospace, automotive and renewable energy applications. This is driven by a need for higher manufacturing rates from aerospace manufacturers and a need for high quality manufacture for wind and tidal power blades. The main methods for automated layup are Automated Tape Laying (ATL) and Automated Fibre Placement (AFP). However, despite its industrial importance the amount of research into both processes is limited, in particular with respect to productivity and process reliability. The study outlined in this presentation aims to investigate feasible processing conditions for automated layup that may improve laminate quality and productivity both analytically and experimentally whilst curing out-of-autoclave. Prepreg properties relevant to automated processing are identified. Lastly, requirements for an optimised layup system are proposed. A detailed study of the resin content of automation grade prepreg shows a significant variability of resin content that may affect tack and lead to unsuccessful layup. High product quality is governed by the amount of voidage entrapped in the uncured plies. A study of the surface roughness of uncured prepreg shows the potential for significant entrapment of air during layup. Since debulking is commonly omitted for continuous processing a large amount of voidage is entrapped in the uncured laminate and may have detrimental impact on mechanical performance. A model was developed that takes into account the prepreg interface and forming behaviour during automated processing to predict the amount of entrapped air and allow optimisation of processing conditions. A two-stage layup model was implemented in Abaqus/Implicit to study the process in detail. First, the interaction between ply and layup system was studied in detail, the results were then used to predict the forming behaviour of uncured prepreg on a microscopic scale. To understand the effect of processing conditions in more detail a laboratory Iayup system was built that enables layup at conditions currently not achievable with industrial equipment. The interaction between layup temperature and pressure was studied experimentally to validate previously developed models

Subjects/Keywords: 670

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APA (6^th Edition):

Lukaszewicz, D. H. A. (2011). Optimisation of high-speed automated layup of thermoset carbon-fibre preimpregnates. (Doctoral Dissertation). University of Bristol. Retrieved from http://hdl.handle.net/1983/d3ba26e7-7a56-4a95-bc68-9df2c27326ad

Chicago Manual of Style (16^th Edition):

Lukaszewicz, Dirk Hans-Joachim Adrian. “Optimisation of high-speed automated layup of thermoset carbon-fibre preimpregnates.” 2011. Doctoral Dissertation, University of Bristol. Accessed January 24, 2021. http://hdl.handle.net/1983/d3ba26e7-7a56-4a95-bc68-9df2c27326ad.

MLA Handbook (7^th Edition):

Lukaszewicz, Dirk Hans-Joachim Adrian. “Optimisation of high-speed automated layup of thermoset carbon-fibre preimpregnates.” 2011. Web. 24 Jan 2021.

Vancouver:

Lukaszewicz DHA. Optimisation of high-speed automated layup of thermoset carbon-fibre preimpregnates. [Internet] [Doctoral dissertation]. University of Bristol; 2011. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/1983/d3ba26e7-7a56-4a95-bc68-9df2c27326ad.

Council of Science Editors:

Lukaszewicz DHA. Optimisation of high-speed automated layup of thermoset carbon-fibre preimpregnates. [Doctoral Dissertation]. University of Bristol; 2011. Available from: http://hdl.handle.net/1983/d3ba26e7-7a56-4a95-bc68-9df2c27326ad

Cardiff University

4. Petkov, Petko. Laser milling : surface integrity, removal strategies and process accuracy.

Degree: PhD, 2011, Cardiff University

URL: http://orca.cf.ac.uk/13705/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.567142

► Laser milling is capable of processing a large range of materials which are not machinable with conventional manufacturing processes. Engineering materials such as glass, metals… (more)

▼ Laser milling is capable of processing a large range of materials which are not machinable with conventional manufacturing processes. Engineering materials such as glass, metals and ceramics can be machined without requiring expensive special tools and without any limitations on the 3D complexity of the component. Laser milling is still in its infancy. Laser material interactions are not yet fully understood. Much effort in research and development of the available laser sources is still needed. Ultrafast lasers are beginning to be applied. They can offer more precise machining without the thermal damage that accompanies long-pulse laser manufacturing. Laser pulse duration and its effect on resulting surface integrity has been studied as well as material removal strategy and process accuracy. In order to characterise the resulting surface after laser ablation, the heat affected zone is usually specified. In most cases, visual inspection would be performed without further analysis, resulting in variance of the findings attributed to the operator. A new methodology was required to accurately and impartially assess the heat penetration and quantify the findings. Based on material grain refinement, a comprehensive new methodology was created. By monitoring the changes in grain sizes, a chart of the heat penetration could be created accurately with automated routines. Surface integrity is a critical factor for many applications and a methodology based on analysis of grain refinement in the vicinity of the processed area would create a full map of - iii - the changes happening after laser ablation. Furthermore, the impact of the laser pulse duration is studied utilising the above mentioned development. Further to the surface roughness and heat affected zone, an in-depth analysis was completed on the micro hardness of the material in order to create a comprehensive chart of the changes induced by the laser milling process. Material removal is based on the overlapping of single craters, and the way the craters overlap is referred to as material removal strategy. Generally there are many strategies formulated for material removal but none of them takes into account the specifics of laser milling. Based on surface orientation, dimensions and feature importance, an assessment of material removal strategies is presented. Although ‘laser milling’ is a term used for a number of material removal processes, there are significant differences between them. New strategies for material removal are formulated and reported based on surface topography and orientation. Advanced programming is realised using a commercially available generic CAM package but taking into account the specifics of the laser milling process. The accuracy of the laser milling process depends on the laser-material interaction, and also on the machine hardware, control system and software. Most of the factors affecting accuracy cannot be changed once the machine is built, but there are some that can be optimised to improve process accuracy. The laser source with its…

Subjects/Keywords: 670

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

APA (6^th Edition):

Petkov, P. (2011). Laser milling : surface integrity, removal strategies and process accuracy. (Doctoral Dissertation). Cardiff University. Retrieved from http://orca.cf.ac.uk/13705/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.567142

Chicago Manual of Style (16^th Edition):

Petkov, Petko. “Laser milling : surface integrity, removal strategies and process accuracy.” 2011. Doctoral Dissertation, Cardiff University. Accessed January 24, 2021. http://orca.cf.ac.uk/13705/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.567142.

MLA Handbook (7^th Edition):

Petkov, Petko. “Laser milling : surface integrity, removal strategies and process accuracy.” 2011. Web. 24 Jan 2021.

Vancouver:

Petkov P. Laser milling : surface integrity, removal strategies and process accuracy. [Internet] [Doctoral dissertation]. Cardiff University; 2011. [cited 2021 Jan 24]. Available from: http://orca.cf.ac.uk/13705/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.567142.

Council of Science Editors:

Petkov P. Laser milling : surface integrity, removal strategies and process accuracy. [Doctoral Dissertation]. Cardiff University; 2011. Available from: http://orca.cf.ac.uk/13705/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.567142

Cranfield University

5. Martina, Filomeno. Investigation of methods to manipulate geometry, microstructure and mechanical properties in titanium large scale Wire+Arc Additive Manufacturing.

Degree: PhD, 2014, Cranfield University

URL: http://dspace.lib.cranfield.ac.uk/handle/1826/9270 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.655979

► Wire+arc additive manufacturing is a technique suitable for the deposition of large components; a variety of materials can be processed, including titanium. For the alloy… (more)

▼ Wire+arc additive manufacturing is a technique suitable for the deposition of large components; a variety of materials can be processed, including titanium. For the alloy Ti{6Al{4V, an experimental model based on design of experiment and linear regression was developed to control layer geometry during deposition. The modelled variables were wall width and layer height; the former was dependent on the heat input, and the latter on the heat input as well as on the wire feed speed to travel speed ratio. Equations enabled the automatic selection of process parameters based on geometric requirements speci c to the part being built. This could ensure minimisation of production time and material waste. Additively manufactured parts are a ected by distortion and residual stress; the e ect of high pressure rolling on these two, as well as on geometry, microstructure and mechanical properties was studied. Due to plastic deformation, rolled linear deposits were characterised by a larger width and smaller height. The variability of the layer height was reduced, a bene cial e ect from a production implementation viewpoint. Distortion was less than half in rolled components, a change associated with the reduction in residual stress which were still tensile in the bottom of the parts and compressive in their top; however their overall magnitude was smaller than in the unrolled samples. The contour method showed relatively good agreement with the neutron di raction measurements, and although destructive it proved to be a fast way to characterise residual stress in additively manufactured components. Microstructurally, the columnar prior grains con guration observed in all unrolled deposits, also a ected by a strong texture developed in the building direction, was changed to equiaxed grains due to the recrystallisation triggered by both the strain introduced by rolling and the repeated thermal cycles induced by each layer deposition. The microstructure was overall considerably ner and the texture randomised. A fundamental study was performed to discern the extent of the deformed zone from the one a ected thermally. While the deformed zone could not be identi ed precisely, the thermally in uenced zone showed a relationship between rolling load and depth of the recrystallised volume. Finally, testing of hardness and tensile strength showed superior properties of rolled specimens than in the unrolled specimens. The mechanical performance of rolled samples was fully isotropic too. This project was entirely sponsored by Airbus Group Innovations (formerly EADS Innovation Works).

Subjects/Keywords: 670

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

APA (6^th Edition):

Martina, F. (2014). Investigation of methods to manipulate geometry, microstructure and mechanical properties in titanium large scale Wire+Arc Additive Manufacturing. (Doctoral Dissertation). Cranfield University. Retrieved from http://dspace.lib.cranfield.ac.uk/handle/1826/9270 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.655979

Chicago Manual of Style (16^th Edition):

Martina, Filomeno. “Investigation of methods to manipulate geometry, microstructure and mechanical properties in titanium large scale Wire+Arc Additive Manufacturing.” 2014. Doctoral Dissertation, Cranfield University. Accessed January 24, 2021. http://dspace.lib.cranfield.ac.uk/handle/1826/9270 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.655979.

MLA Handbook (7^th Edition):

Martina, Filomeno. “Investigation of methods to manipulate geometry, microstructure and mechanical properties in titanium large scale Wire+Arc Additive Manufacturing.” 2014. Web. 24 Jan 2021.

Vancouver:

Martina F. Investigation of methods to manipulate geometry, microstructure and mechanical properties in titanium large scale Wire+Arc Additive Manufacturing. [Internet] [Doctoral dissertation]. Cranfield University; 2014. [cited 2021 Jan 24]. Available from: http://dspace.lib.cranfield.ac.uk/handle/1826/9270 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.655979.

Council of Science Editors:

Martina F. Investigation of methods to manipulate geometry, microstructure and mechanical properties in titanium large scale Wire+Arc Additive Manufacturing. [Doctoral Dissertation]. Cranfield University; 2014. Available from: http://dspace.lib.cranfield.ac.uk/handle/1826/9270 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.655979

University of Bristol

6. Lukaszewicz, Dirk Hans-Joachim Adrian. Optimisation of high-speed automated layup of thermoset carbon-fibre preimpregnates.

Degree: PhD, 2011, University of Bristol

URL: https://research-information.bris.ac.uk/en/studentTheses/d3ba26e7-7a56-4a95-bc68-9df2c27326ad ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.541610

► Automated lay-up of prepreg is slowly replacing manual layup during the production of composite parts for aerospace, automotive and renewable energy applications. This is driven… (more)

▼ Automated lay-up of prepreg is slowly replacing manual layup during the production of composite parts for aerospace, automotive and renewable energy applications. This is driven by a need for higher manufacturing rates from aerospace manufacturers and a need for high quality manufacture for wind and tidal power blades. The main methods for automated layup are Automated Tape Laying (ATL) and Automated Fibre Placement (AFP). However, despite its industrial importance the amount of research into both processes is limited, in particular with respect to productivity and process reliability. The study outlined in this presentation aims to investigate feasible processing conditions for automated layup that may improve laminate quality and productivity both analytically and experimentally whilst curing out-of-autoclave. Prepreg properties relevant to automated processing are identified. Lastly, requirements for an optimised layup system are proposed. A detailed study of the resin content of automation grade prepreg shows a significant variability of resin content that may affect tack and lead to unsuccessful layup. High product quality is governed by the amount of voidage entrapped in the uncured plies. A study of the surface roughness of uncured prepreg shows the potential for significant entrapment of air during layup. Since debulking is commonly omitted for continuous processing a large amount of voidage is entrapped in the uncured laminate and may have detrimental impact on mechanical performance. A model was developed that takes into account the prepreg interface and forming behaviour during automated processing to predict the amount of entrapped air and allow optimisation of processing conditions. A two-stage layup model was implemented in Abaqus/Implicit to study the process in detail. First, the interaction between ply and layup system was studied in detail, the results were then used to predict the forming behaviour of uncured prepreg on a microscopic scale. To understand the effect of processing conditions in more detail a laboratory Iayup system was built that enables layup at conditions currently not achievable with industrial equipment. The interaction between layup temperature and pressure was studied experimentally to validate previously developed models

Subjects/Keywords: 670

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

APA (6^th Edition):

Lukaszewicz, D. H. A. (2011). Optimisation of high-speed automated layup of thermoset carbon-fibre preimpregnates. (Doctoral Dissertation). University of Bristol. Retrieved from https://research-information.bris.ac.uk/en/studentTheses/d3ba26e7-7a56-4a95-bc68-9df2c27326ad ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.541610

Chicago Manual of Style (16^th Edition):

Lukaszewicz, Dirk Hans-Joachim Adrian. “Optimisation of high-speed automated layup of thermoset carbon-fibre preimpregnates.” 2011. Doctoral Dissertation, University of Bristol. Accessed January 24, 2021. https://research-information.bris.ac.uk/en/studentTheses/d3ba26e7-7a56-4a95-bc68-9df2c27326ad ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.541610.

MLA Handbook (7^th Edition):

Lukaszewicz, Dirk Hans-Joachim Adrian. “Optimisation of high-speed automated layup of thermoset carbon-fibre preimpregnates.” 2011. Web. 24 Jan 2021.

Vancouver:

Lukaszewicz DHA. Optimisation of high-speed automated layup of thermoset carbon-fibre preimpregnates. [Internet] [Doctoral dissertation]. University of Bristol; 2011. [cited 2021 Jan 24]. Available from: https://research-information.bris.ac.uk/en/studentTheses/d3ba26e7-7a56-4a95-bc68-9df2c27326ad ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.541610.

Council of Science Editors:

Lukaszewicz DHA. Optimisation of high-speed automated layup of thermoset carbon-fibre preimpregnates. [Doctoral Dissertation]. University of Bristol; 2011. Available from: https://research-information.bris.ac.uk/en/studentTheses/d3ba26e7-7a56-4a95-bc68-9df2c27326ad ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.541610

University of Surrey

7. Stone, Paul Peter. Use of the autocorrelation matrix in spectral analysis.

Degree: PhD, 1978, University of Surrey

URL: http://epubs.surrey.ac.uk/856624/ ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.473992

► This thesis derives and discusses the properties of the autocorrelation matrix and its relationship to the power spectrum. It then considers how this matrix maybe… (more)

Subjects/Keywords: 670

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

APA (6^th Edition):

Stone, P. P. (1978). Use of the autocorrelation matrix in spectral analysis. (Doctoral Dissertation). University of Surrey. Retrieved from http://epubs.surrey.ac.uk/856624/ ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.473992

Chicago Manual of Style (16^th Edition):

Stone, Paul Peter. “Use of the autocorrelation matrix in spectral analysis.” 1978. Doctoral Dissertation, University of Surrey. Accessed January 24, 2021. http://epubs.surrey.ac.uk/856624/ ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.473992.

MLA Handbook (7^th Edition):

Stone, Paul Peter. “Use of the autocorrelation matrix in spectral analysis.” 1978. Web. 24 Jan 2021.

Vancouver:

Stone PP. Use of the autocorrelation matrix in spectral analysis. [Internet] [Doctoral dissertation]. University of Surrey; 1978. [cited 2021 Jan 24]. Available from: http://epubs.surrey.ac.uk/856624/ ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.473992.

Council of Science Editors:

Stone PP. Use of the autocorrelation matrix in spectral analysis. [Doctoral Dissertation]. University of Surrey; 1978. Available from: http://epubs.surrey.ac.uk/856624/ ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.473992

Cardiff University

8. Lagos, Nikolaos. Knowledge-based product support systems.

Degree: PhD, 2007, Cardiff University

URL: http://orca.cf.ac.uk/54573/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.584020

► This research helps bridge the gap between conventional product support, where the support system is considered as a stand-alone application, and the new paradigm of… (more)

▼ This research helps bridge the gap between conventional product support, where the support system is considered as a stand-alone application, and the new paradigm of responsive one, where the support system frequently communicates with its environment and reacts to stimuli. This new paradigm would enable product support knowledge to be captured, stored, processed, and updated automatically, being delivered to the users when, where and in the form they need it. The research reported in this thesis first defines Product Support Systems (PRSSs) as electronic means that provide accurate and up-to-date information to the user in a coherent and personalised manner. Product support knowledge is then identified as the integration of product, task, user, and support documentation knowledge. Next, the thesis focuses on an ontology-based model of the structure, relations, and attributes of product support knowledge. In that model product support virtual documentation (PSVD) is presented as an aggregation of Information Objects (IOs) and Information Object Clusters (IOCs). The description of PSVD is followed by an analysis of the relation between IOs, IOCs, and domain knowledge. Then, the thesis builds on the ontology-based representation of product support knowledge and explores the synergy between product support, problem solving, and knowledge engineering. As a result, a structured problem solving approach is introduced that combines case-based adaptation and model-based generation techniques. Based on that approach a knowledge engineering framework for product support systems is developed. A conceptual model of context-aware product support systems that extends the framework is then introduced. The conceptual model includes an ontology-based representation of knowledge related to the users, their activities, the support environment, and the device being used. An approach to semi-automatically integrating design and documentation data is also proposed as part of context-aware product support systems development process.

Subjects/Keywords: 670

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

APA (6^th Edition):

Lagos, N. (2007). Knowledge-based product support systems. (Doctoral Dissertation). Cardiff University. Retrieved from http://orca.cf.ac.uk/54573/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.584020

Chicago Manual of Style (16^th Edition):

Lagos, Nikolaos. “Knowledge-based product support systems.” 2007. Doctoral Dissertation, Cardiff University. Accessed January 24, 2021. http://orca.cf.ac.uk/54573/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.584020.

MLA Handbook (7^th Edition):

Lagos, Nikolaos. “Knowledge-based product support systems.” 2007. Web. 24 Jan 2021.

Vancouver:

Lagos N. Knowledge-based product support systems. [Internet] [Doctoral dissertation]. Cardiff University; 2007. [cited 2021 Jan 24]. Available from: http://orca.cf.ac.uk/54573/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.584020.

Council of Science Editors:

Lagos N. Knowledge-based product support systems. [Doctoral Dissertation]. Cardiff University; 2007. Available from: http://orca.cf.ac.uk/54573/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.584020

Cardiff University

9. Buckley, Jake. Queer Fordism : technological bodies moving otherwise.

Degree: PhD, 2010, Cardiff University

URL: http://orca.cf.ac.uk/54379/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.584879

► This thesis analyses the temporal logic that informs the shift from Fordism to post-Fordism, a highly influential narrative for understanding how developments in technology affect… (more)

▼ This thesis analyses the temporal logic that informs the shift from Fordism to post-Fordism, a highly influential narrative for understanding how developments in technology affect the body in western nation-states from the late nineteenth century to the present. The thesis reads this shift as a history of touch and bodily mobility. First, I study the techniques of factory management known as Taylorism, which provided the basis for the Fordist socioeconomic system. Taylorized Fordism, I show, made working bodies touch technological objects in order to time, represent, and control bodily movements. However, I argue that Taylorized Fordist techniques organize bodies into a space of tactility, which is not the same as invoking Fordism as a predictable system of domination. Second, I discuss socio-historical accounts that outline the reasons for Fordism's eventual failure and replacement, all of which emphasize bodily flexibility as the quality that determines a post-Fordist time. I consider the fate of Taylorism in Fordism's ostensible demise, by explicating the subtlety with which Taylorism is superseded by the more flexible practice of ergonomics. Third, I conduct a philosophical analysis of what it means for bodies to be affected by post-Fordist changes in technological objects, most prominently the transition towards digital media. I refute the notion of a post-Fordist digital age, by arguing that Taylorized Fordism can be interpreted as a model of digital bodily function that persists uncomfortably in the present. The thesis concludes by arguing for the significance of touching tactile technological objects—and tactile technological bodies making contact with one another—in ways that produce stasis, rigidity, and hardness—Fordist qualities that are unfairly subordinated in a post-Fordist temporal frame. I call these relations 'queer Fordism', whereby a technological body's activity is not contemporaneous with a presumed Fordist-to-post-Fordist continuum.

Subjects/Keywords: 670

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APA (6^th Edition):

Buckley, J. (2010). Queer Fordism : technological bodies moving otherwise. (Doctoral Dissertation). Cardiff University. Retrieved from http://orca.cf.ac.uk/54379/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.584879

Chicago Manual of Style (16^th Edition):

Buckley, Jake. “Queer Fordism : technological bodies moving otherwise.” 2010. Doctoral Dissertation, Cardiff University. Accessed January 24, 2021. http://orca.cf.ac.uk/54379/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.584879.

MLA Handbook (7^th Edition):

Buckley, Jake. “Queer Fordism : technological bodies moving otherwise.” 2010. Web. 24 Jan 2021.

Vancouver:

Buckley J. Queer Fordism : technological bodies moving otherwise. [Internet] [Doctoral dissertation]. Cardiff University; 2010. [cited 2021 Jan 24]. Available from: http://orca.cf.ac.uk/54379/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.584879.

Council of Science Editors:

Buckley J. Queer Fordism : technological bodies moving otherwise. [Doctoral Dissertation]. Cardiff University; 2010. Available from: http://orca.cf.ac.uk/54379/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.584879

Cardiff University

10. Al-Jabbouli, Hasan. Data clustering using the Bees Algorithm and the Kd-tree structure.

Degree: PhD, 2009, Cardiff University

URL: http://orca.cf.ac.uk/54947/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.584653

► Data clustering has been studied intensively during the past decade. The K-means and C-means algorithms are the most popular of clustering techniques. The former algorithm… (more)

Subjects/Keywords: 670

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APA (6^th Edition):

Al-Jabbouli, H. (2009). Data clustering using the Bees Algorithm and the Kd-tree structure. (Doctoral Dissertation). Cardiff University. Retrieved from http://orca.cf.ac.uk/54947/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.584653

Chicago Manual of Style (16^th Edition):

Al-Jabbouli, Hasan. “Data clustering using the Bees Algorithm and the Kd-tree structure.” 2009. Doctoral Dissertation, Cardiff University. Accessed January 24, 2021. http://orca.cf.ac.uk/54947/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.584653.

MLA Handbook (7^th Edition):

Al-Jabbouli, Hasan. “Data clustering using the Bees Algorithm and the Kd-tree structure.” 2009. Web. 24 Jan 2021.

Vancouver:

Al-Jabbouli H. Data clustering using the Bees Algorithm and the Kd-tree structure. [Internet] [Doctoral dissertation]. Cardiff University; 2009. [cited 2021 Jan 24]. Available from: http://orca.cf.ac.uk/54947/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.584653.

Council of Science Editors:

Al-Jabbouli H. Data clustering using the Bees Algorithm and the Kd-tree structure. [Doctoral Dissertation]. Cardiff University; 2009. Available from: http://orca.cf.ac.uk/54947/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.584653

11. Whitton, Peter William. An investigation of the surface friction in cold rolling.

Degree: PhD, 1953, Imperial College London

URL: http://hdl.handle.net/10044/1/12431

Subjects/Keywords: 670

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APA (6^th Edition):

Whitton, P. W. (1953). An investigation of the surface friction in cold rolling. (Doctoral Dissertation). Imperial College London. Retrieved from http://hdl.handle.net/10044/1/12431

Chicago Manual of Style (16^th Edition):

Whitton, Peter William. “An investigation of the surface friction in cold rolling.” 1953. Doctoral Dissertation, Imperial College London. Accessed January 24, 2021. http://hdl.handle.net/10044/1/12431.

MLA Handbook (7^th Edition):

Whitton, Peter William. “An investigation of the surface friction in cold rolling.” 1953. Web. 24 Jan 2021.

Vancouver:

Whitton PW. An investigation of the surface friction in cold rolling. [Internet] [Doctoral dissertation]. Imperial College London; 1953. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/10044/1/12431.

Council of Science Editors:

Whitton PW. An investigation of the surface friction in cold rolling. [Doctoral Dissertation]. Imperial College London; 1953. Available from: http://hdl.handle.net/10044/1/12431

12. See-Toh, Yoong Chiang. Paints supply chain optimisation.

Degree: PhD, 2008, Imperial College London

URL: http://hdl.handle.net/10044/1/7504

► In production planning for strong seasonal demand products, it is uneconomical to configure the supply chain for throughputs equivalent to the demand peaks. Instead, a… (more)

▼ In production planning for strong seasonal demand products, it is uneconomical to configure the supply chain for throughputs equivalent to the demand peaks. Instead, a holistic approach to supply chain optimisation is adopted where forward demand forecasts drive the production planning process. In this thesis, the medium-term supply chain planning components of forecasting, production planning and evaluation are addressed through studies on a paints production facility. With a large number of specialised products, family-level forecasting is adopted for its simplicity and practicality in applying forecast techniques, coupled with its benefits on the inception of new products into markets. A time-series component was incorporated into traditional clustering techniques for segmenting products into families. The dominant cluster profiles identified are attributed as the seasonal component for the subsequent generation of demand profiles. In multi-purpose batch plants, production planning involves the twin decisions of batch sizing and lot sizing, often performed in series. This campaign is optimised through augmenting the batch sizing operation within a lot-sizing model. In the Mixed Integer Linear Programming model developed here, the degrees of freedom are the monthly batch sizes of each product, integer number of batches of each product produced each month, amount of monthly overtime working and outsourcing required as well as the time-varying inventory positions across the chain. Values for these are selected to balance the trade-offs in batch costs and inventory costs as well as the overtime and outsourcing costs. The final section sees the development of stochastic, dynamic supply chain models to predict the effect of different inventory policies, taking into account forecast accuracy, as derived from clustering. Using Monte Carlo based simulations, the various supply and production decisions are assessed against process manufacturing performance indicators. These planning components are then reconfigured to derive an optimal paints supply chain.

Subjects/Keywords: 670

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APA (6^th Edition):

See-Toh, Y. C. (2008). Paints supply chain optimisation. (Doctoral Dissertation). Imperial College London. Retrieved from http://hdl.handle.net/10044/1/7504

Chicago Manual of Style (16^th Edition):

See-Toh, Yoong Chiang. “Paints supply chain optimisation.” 2008. Doctoral Dissertation, Imperial College London. Accessed January 24, 2021. http://hdl.handle.net/10044/1/7504.

MLA Handbook (7^th Edition):

See-Toh, Yoong Chiang. “Paints supply chain optimisation.” 2008. Web. 24 Jan 2021.

Vancouver:

See-Toh YC. Paints supply chain optimisation. [Internet] [Doctoral dissertation]. Imperial College London; 2008. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/10044/1/7504.

Council of Science Editors:

See-Toh YC. Paints supply chain optimisation. [Doctoral Dissertation]. Imperial College London; 2008. Available from: http://hdl.handle.net/10044/1/7504

Cranfield University

13. Farrell, J. Hyperbaric welding of duplex stainless steel pipelines offshore.

Degree: PhD, 1996, Cranfield University

URL: http://dspace.lib.cranfield.ac.uk/handle/1826/4513 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.519126

► Three duplex stainless steels (Avesta 2205, Sandvik SAF2507 and Zeron 100) were successfully welded automatically at a range of pressures from 1 to 32bar. The… (more)

Subjects/Keywords: 670

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APA (6^th Edition):

Farrell, J. (1996). Hyperbaric welding of duplex stainless steel pipelines offshore. (Doctoral Dissertation). Cranfield University. Retrieved from http://dspace.lib.cranfield.ac.uk/handle/1826/4513 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.519126

Chicago Manual of Style (16^th Edition):

Farrell, J. “Hyperbaric welding of duplex stainless steel pipelines offshore.” 1996. Doctoral Dissertation, Cranfield University. Accessed January 24, 2021. http://dspace.lib.cranfield.ac.uk/handle/1826/4513 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.519126.

MLA Handbook (7^th Edition):

Farrell, J. “Hyperbaric welding of duplex stainless steel pipelines offshore.” 1996. Web. 24 Jan 2021.

Vancouver:

Farrell J. Hyperbaric welding of duplex stainless steel pipelines offshore. [Internet] [Doctoral dissertation]. Cranfield University; 1996. [cited 2021 Jan 24]. Available from: http://dspace.lib.cranfield.ac.uk/handle/1826/4513 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.519126.

Council of Science Editors:

Farrell J. Hyperbaric welding of duplex stainless steel pipelines offshore. [Doctoral Dissertation]. Cranfield University; 1996. Available from: http://dspace.lib.cranfield.ac.uk/handle/1826/4513 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.519126

University of Surrey

14. Howard, Kevin Richard. The application of entropy in optimising systems.

Degree: PhD, 2009, University of Surrey

URL: http://epubs.surrey.ac.uk/842681/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.505971

► A novel application of entropy to support Systems Engineering is presented with the specific objective of providing unambiguous and objective decision support to the engineer… (more)

Subjects/Keywords: 670

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APA (6^th Edition):

Howard, K. R. (2009). The application of entropy in optimising systems. (Doctoral Dissertation). University of Surrey. Retrieved from http://epubs.surrey.ac.uk/842681/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.505971

Chicago Manual of Style (16^th Edition):

Howard, Kevin Richard. “The application of entropy in optimising systems.” 2009. Doctoral Dissertation, University of Surrey. Accessed January 24, 2021. http://epubs.surrey.ac.uk/842681/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.505971.

MLA Handbook (7^th Edition):

Howard, Kevin Richard. “The application of entropy in optimising systems.” 2009. Web. 24 Jan 2021.

Vancouver:

Howard KR. The application of entropy in optimising systems. [Internet] [Doctoral dissertation]. University of Surrey; 2009. [cited 2021 Jan 24]. Available from: http://epubs.surrey.ac.uk/842681/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.505971.

Council of Science Editors:

Howard KR. The application of entropy in optimising systems. [Doctoral Dissertation]. University of Surrey; 2009. Available from: http://epubs.surrey.ac.uk/842681/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.505971

15. Nadiri, F. Polymer melt flow in cable covering equipment.

Degree: PhD, 1979, Imperial College London

URL: http://hdl.handle.net/10044/1/34968

Subjects/Keywords: 670

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APA (6^th Edition):

Nadiri, F. (1979). Polymer melt flow in cable covering equipment. (Doctoral Dissertation). Imperial College London. Retrieved from http://hdl.handle.net/10044/1/34968

Chicago Manual of Style (16^th Edition):

Nadiri, F. “Polymer melt flow in cable covering equipment.” 1979. Doctoral Dissertation, Imperial College London. Accessed January 24, 2021. http://hdl.handle.net/10044/1/34968.

MLA Handbook (7^th Edition):

Nadiri, F. “Polymer melt flow in cable covering equipment.” 1979. Web. 24 Jan 2021.

Vancouver:

Nadiri F. Polymer melt flow in cable covering equipment. [Internet] [Doctoral dissertation]. Imperial College London; 1979. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/10044/1/34968.

Council of Science Editors:

Nadiri F. Polymer melt flow in cable covering equipment. [Doctoral Dissertation]. Imperial College London; 1979. Available from: http://hdl.handle.net/10044/1/34968

16. Watts, Anthony Bertram. The yield and flow of strain-hardening materials in plane deformation and the connection with simple compression and cold rolling.

Degree: PhD, 1953, Imperial College London

URL: http://hdl.handle.net/10044/1/12430

Subjects/Keywords: 670

Record Details Similar Records Cite « Share

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APA (6^th Edition):

Watts, A. B. (1953). The yield and flow of strain-hardening materials in plane deformation and the connection with simple compression and cold rolling. (Doctoral Dissertation). Imperial College London. Retrieved from http://hdl.handle.net/10044/1/12430

Chicago Manual of Style (16^th Edition):

Watts, Anthony Bertram. “The yield and flow of strain-hardening materials in plane deformation and the connection with simple compression and cold rolling.” 1953. Doctoral Dissertation, Imperial College London. Accessed January 24, 2021. http://hdl.handle.net/10044/1/12430.

MLA Handbook (7^th Edition):

Watts, Anthony Bertram. “The yield and flow of strain-hardening materials in plane deformation and the connection with simple compression and cold rolling.” 1953. Web. 24 Jan 2021.

Vancouver:

Watts AB. The yield and flow of strain-hardening materials in plane deformation and the connection with simple compression and cold rolling. [Internet] [Doctoral dissertation]. Imperial College London; 1953. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/10044/1/12430.

Council of Science Editors:

Watts AB. The yield and flow of strain-hardening materials in plane deformation and the connection with simple compression and cold rolling. [Doctoral Dissertation]. Imperial College London; 1953. Available from: http://hdl.handle.net/10044/1/12430

17. Heinl, Hans. A hierarchical, integrated process-, resource- and object-model.

Degree: PhD, 2001, University of South Wales

URL: https://pure.southwales.ac.uk/en/studentthesis/a-hierarchical-integrated-process-resource-and-objectmodel(84534b58-23e0-443f-9f20-77da10b838cc).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.393066

► Planning new production systems is a very complex task which covers several stages from preparation to realisation, and concerns technical as well as economic aspects.… (more)

▼ Planning new production systems is a very complex task which covers several stages from preparation to realisation, and concerns technical as well as economic aspects. The general objective of this study is to investigate the use of cost information during the stage of planning production systems in order to integrate technical and economic aspects. Its main aim is to create a model, providing cost information in different levels of detail regarding processes, resources and products of the intended system in the stage of planning. The purpose is to design a 'Hierarchical, Integrated Process-, Resource- and Object-Model', which represents the mutual dependence of individual functions and the sequences of operations in the planned production structure. The theoretical concept of the model shall be transformed into a windows-based software program. The model will help to assess new structures in an early stage of planning by making relevant cost- and performance-data available. In a review of relevant topics, the author points out that the current situation for planning production systems is very demanding. A computer based method which can provide monetary analyses in the planning stage would be very helpful. A review of current methods shows that there are many which are related to the subject of planning production systems. However, no method or program could be found which meets the described requirements. Because of the shortfalls of existing methods, a new method is proposed by the author. The theoretical concept of this new method involves three main characteristics: 1. Both monetary analyses and analyses in the original unit (for example in hours, minutes, kg and so on) are possible for all elements of the planned production system. 2. The author demonstrates that Processes, Resources and Objects can be used as the Basic-Elements of a production system. The Basic-Elements are strictly separated in single models. The integration of these three models (P-Model, R-Model and O-Model) leads to a 'three dimensional' planning and costing system. 3. The three separated models and the integration itself, are hierarchically structured. This allows analyses in different levels of detail. The hierarchical structures are described in a simple and clear way in order to reach a logical, hierarchical structure. By repeatedly applying simple rules, high complexity can be described and handled. The original contribution to knowledge, achieved through this research study, is the combination of these three main characteristics in the new planning method. Especially the strict separation of Processes, Resources and Objects, the way of integrating these three separated Models and the way of modelling hierarchical structures are the original contribution of the author. In a description of the new method, both the theoretical concept and the developed software program are introduced and explained by using an example. Some analyses which are generated for the given example are shown at the end of the description section.

Subjects/Keywords: 670

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APA (6^th Edition):

Heinl, H. (2001). A hierarchical, integrated process-, resource- and object-model. (Doctoral Dissertation). University of South Wales. Retrieved from https://pure.southwales.ac.uk/en/studentthesis/a-hierarchical-integrated-process-resource-and-objectmodel(84534b58-23e0-443f-9f20-77da10b838cc).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.393066

Chicago Manual of Style (16^th Edition):

Heinl, Hans. “A hierarchical, integrated process-, resource- and object-model.” 2001. Doctoral Dissertation, University of South Wales. Accessed January 24, 2021. https://pure.southwales.ac.uk/en/studentthesis/a-hierarchical-integrated-process-resource-and-objectmodel(84534b58-23e0-443f-9f20-77da10b838cc).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.393066.

MLA Handbook (7^th Edition):

Heinl, Hans. “A hierarchical, integrated process-, resource- and object-model.” 2001. Web. 24 Jan 2021.

Vancouver:

Heinl H. A hierarchical, integrated process-, resource- and object-model. [Internet] [Doctoral dissertation]. University of South Wales; 2001. [cited 2021 Jan 24]. Available from: https://pure.southwales.ac.uk/en/studentthesis/a-hierarchical-integrated-process-resource-and-objectmodel(84534b58-23e0-443f-9f20-77da10b838cc).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.393066.

Council of Science Editors:

Heinl H. A hierarchical, integrated process-, resource- and object-model. [Doctoral Dissertation]. University of South Wales; 2001. Available from: https://pure.southwales.ac.uk/en/studentthesis/a-hierarchical-integrated-process-resource-and-objectmodel(84534b58-23e0-443f-9f20-77da10b838cc).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.393066

University of Edinburgh

18. Kim, Taehee. Development of PVDF tactile dynamic sensing in a behaviour-based assembly robot.

Degree: PhD, 1996, University of Edinburgh

URL: http://hdl.handle.net/1842/34880

► The research presented in this thesis focuses on the development of tactile event signature sensors and their application, especially in reactive behaviour-based robotic assembly systems.… (more)

▼ The research presented in this thesis focuses on the development of tactile event signature sensors and their application, especially in reactive behaviour-based robotic assembly systems. In pursuit of practical and economic sensors for detecting part contact, the application of PVDF (polyvinylidene fluoride) film, a mechanical vibration sensitive piezo material, is investigated. A Clunk Sensor is developed which remotely detects impact vibrations, and a Push Sensor is developed which senses small changes in the deformation of a compliant finger surface. The Push Sensor is further developed to provide some force direction and force pattern sensing capability. By being able to detect changes of state in an assembly, such as a change of contact force, an assembly robot can be well informed of current conditions. The complex structure of assembly tasks provides a rich context within which to interpret changes of state, so simple binary sensors can conveniently supply a lot more information than in the domain of mobile robots. Guarded motions, for example, which require sensing a change of state, have long been recognised as very useful in part mating tasks. Guarded motions are particularly well suited to be components of assembly behavioural modules. In behaviour-based robotic assembly systems, the high level planner is endowed with as little complexity as possible while the low level planning execution agent deals with actual sensing and action. Highly reactive execution agents can provide advantages by encapsulating low level sensing and action, hiding the details of sensori-motor complexity from the higher levels. Because behaviour-based assembly systems emphasise the utility of this kind of qualitative state-change sensor (as opposed to sensors which measure physical quantities), the robustness and utility of the Push Sensor was tested in an experimental behaviour-based system. An experimental task of pushing a ring along a convoluted stiff wire is chosen, in which the tactile sensors developed here are aided by vision. Three different methods of combining these different sensors within the general behaviour-based paradigm are implemented and compared. This exercise confirms the robustness and utility of the PVDF-based tactile sensors. We argue that the comparison suggests that for behaviour-based assembly systems using multiple concurrent sensor systems, bottom-level motor control in terms of force or velocity would be more appropriate than positional control. Behaviour-based systems have traditionally tried to avoid symbolic knowledge. Considering this in the light of the above work, it was found useful to develop a taxonomy of type of knowledge and refine the prohibition.

Subjects/Keywords: 670

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APA (6^th Edition):

Kim, T. (1996). Development of PVDF tactile dynamic sensing in a behaviour-based assembly robot. (Doctoral Dissertation). University of Edinburgh. Retrieved from http://hdl.handle.net/1842/34880

Chicago Manual of Style (16^th Edition):

Kim, Taehee. “Development of PVDF tactile dynamic sensing in a behaviour-based assembly robot.” 1996. Doctoral Dissertation, University of Edinburgh. Accessed January 24, 2021. http://hdl.handle.net/1842/34880.

MLA Handbook (7^th Edition):

Kim, Taehee. “Development of PVDF tactile dynamic sensing in a behaviour-based assembly robot.” 1996. Web. 24 Jan 2021.

Vancouver:

Kim T. Development of PVDF tactile dynamic sensing in a behaviour-based assembly robot. [Internet] [Doctoral dissertation]. University of Edinburgh; 1996. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/1842/34880.

Council of Science Editors:

Kim T. Development of PVDF tactile dynamic sensing in a behaviour-based assembly robot. [Doctoral Dissertation]. University of Edinburgh; 1996. Available from: http://hdl.handle.net/1842/34880

Loughborough University

19. Read, Craig. Complexity characteristics and measurement within engineering systems.

Degree: PhD, 2008, Loughborough University

URL: http://hdl.handle.net/2134/8140

► Complexity is a significant factor in the development of new products and systems; generally speaking, the higher the complexity, the more difficult products and systems… (more)

▼ Complexity is a significant factor in the development of new products and systems; generally speaking, the higher the complexity, the more difficult products and systems are going to be to design and develop. There are a number of different factors that influence complexity within systems, namely: interoperability; upgradability; adaptability; evolving requirements; system size; automation requirements; performance requirements; support requirements; sustainability; reliability; the need for increased product lifespan; and finally, the length of time systems take to develop. There is, at present, no common language to describe complexity within engineered systems; this language needs to be developed in order to help industry cope with increasing product complexity and thus meet customer demands. This thesis represents a start in the development of that language, and thus an understanding of systems complexity. The thesis offers a framework for complexity analysis within systems, one which identifies some of the key complexity characteristics that need to be taken into consideration, and which embraces complexity problems, definitions, concepts and classifications, origins and coping mechanisms. It has also has been developed in terms of a measurement approach, thereby allowing for a meaningful comparison between products, and an understanding of the complexities within them. This framework was developed using information collected from academic literature and from more specific case studies. Each complexity characteristic was investigated, and the interactions between characteristics were identified; these interactions allow us to understand complexity and help to develop a common language. The thesis develops a measurement technique that quantifies various complexity characteristics in terms of the framework laid down, thus enabling a quantified understanding of complexity within systems. This new measurement approach was tested on a set of recent case studies, and the complexity characteristics produced by the measurement technique were, in turn, tested against attributes of the system. The framework itself is always evolving - it incorporates new complexity characteristics. Nevertheless, such evolution can only further our understanding of complexity. Further work, to explore and integrate the approach demonstrated in this thesis into an automated tool, and test its robustness, along with a continual development of other elements of the framework, such as a classification of complexity, is recommended.

Subjects/Keywords: 670

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APA (6^th Edition):

Read, C. (2008). Complexity characteristics and measurement within engineering systems. (Doctoral Dissertation). Loughborough University. Retrieved from http://hdl.handle.net/2134/8140

Chicago Manual of Style (16^th Edition):

Read, Craig. “Complexity characteristics and measurement within engineering systems.” 2008. Doctoral Dissertation, Loughborough University. Accessed January 24, 2021. http://hdl.handle.net/2134/8140.

MLA Handbook (7^th Edition):

Read, Craig. “Complexity characteristics and measurement within engineering systems.” 2008. Web. 24 Jan 2021.

Vancouver:

Read C. Complexity characteristics and measurement within engineering systems. [Internet] [Doctoral dissertation]. Loughborough University; 2008. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/2134/8140.

Council of Science Editors:

Read C. Complexity characteristics and measurement within engineering systems. [Doctoral Dissertation]. Loughborough University; 2008. Available from: http://hdl.handle.net/2134/8140

De Montfort University

20. Chen, Xi. Component-based control system development for agile manufacturing machine systems.

Degree: PhD, 2003, De Montfort University

URL: http://hdl.handle.net/2086/13263

► It is now a common sense that manufactures including machine suppliers and system integrators of the 21 st century will need to compete on global… (more)

Subjects/Keywords: 670

Record Details Similar Records Cite « Share

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APA (6^th Edition):

Chen, X. (2003). Component-based control system development for agile manufacturing machine systems. (Doctoral Dissertation). De Montfort University. Retrieved from http://hdl.handle.net/2086/13263

Chicago Manual of Style (16^th Edition):

Chen, Xi. “Component-based control system development for agile manufacturing machine systems.” 2003. Doctoral Dissertation, De Montfort University. Accessed January 24, 2021. http://hdl.handle.net/2086/13263.

MLA Handbook (7^th Edition):

Chen, Xi. “Component-based control system development for agile manufacturing machine systems.” 2003. Web. 24 Jan 2021.

Vancouver:

Chen X. Component-based control system development for agile manufacturing machine systems. [Internet] [Doctoral dissertation]. De Montfort University; 2003. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/2086/13263.

Council of Science Editors:

Chen X. Component-based control system development for agile manufacturing machine systems. [Doctoral Dissertation]. De Montfort University; 2003. Available from: http://hdl.handle.net/2086/13263

University of Edinburgh

21. Bispo, Edvaldo Marques. An analysis of the inspection of mechanical parts using dense range data.

Degree: PhD, 1996, University of Edinburgh

URL: http://hdl.handle.net/1842/21612

► More than ever, efficiency and quality are key words in modern industry. This situation enhances the importance of quality control and creates a great demand… (more)

▼ More than ever, efficiency and quality are key words in modern industry. This situation enhances the importance of quality control and creates a great demand for cheap and reliable automatic inspection systems. Taking into account these facts and the demand for systems able to inspect the final shape of machined parts, we decided to investigate the viability of automatic model-based inspection of mechanical parts using the dense range data produced by laser stripers. Given a part to be inspected and a corresponding model of the part stored in the model data base, the first step of inspecting the part is the acquisition of data corresponding to the part, in our case this means the acquisition of a range image of it. In order to be able to compare the part image and its stored model, it is necessary to align the model with the range image of the part. This process, called registration, corresponds to finding the rigid transformation that superposes model and image. After the image and model are registered, the actual inspection uses the range image to verify if all the features predicted in the model are present and have the right pose and dimensions. Therefore, besides the acquisition of range images, the inspection of machined parts involves three main issues: modelling, registration and inspection diagnosis. The application, for inspection purposes, of the main representational schemes for modelling solid objects is discussed and it is suggested the use of EDT models (see [Zeid 91]). A particular implementation of EDT models is presented. A novel approach for the verification of tolerances during the inspection is proposed. The approach allows not only the inspection of the most common tolerances described in the tolerancing standards, but also the inspection of tolerances defined according to Requicha's theory of tolerancing (see [Requicha 83]). A model of the sensitivity and reliability of the inspection process based on the modelling of the errors during the inspection process is also proposed. The importance of the accuracy of the registration in different inspections tasks is discussed. A modified version of the ICP algorithm (see [Besl &; McKay 92]) for the registration of sculptured surfaces is proposed. The maximum accuracy of the ICP algorithm, as a function of the sensor errors and the number of matched points, is determined. A novel method for the measurement and reconstruction of waviness errors on sculp¬ tured surfaces is proposed. The method makes use of the 2D Discrete Fourier Transform for the detection and reconstruction of the waviness error. A model of the sensitivity and reliability of the method is proposed. The application of the methods proposed is illustrated using synthetic and real range images.

Subjects/Keywords: 670

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APA (6^th Edition):

Bispo, E. M. (1996). An analysis of the inspection of mechanical parts using dense range data. (Doctoral Dissertation). University of Edinburgh. Retrieved from http://hdl.handle.net/1842/21612

Chicago Manual of Style (16^th Edition):

Bispo, Edvaldo Marques. “An analysis of the inspection of mechanical parts using dense range data.” 1996. Doctoral Dissertation, University of Edinburgh. Accessed January 24, 2021. http://hdl.handle.net/1842/21612.

MLA Handbook (7^th Edition):

Bispo, Edvaldo Marques. “An analysis of the inspection of mechanical parts using dense range data.” 1996. Web. 24 Jan 2021.

Vancouver:

Bispo EM. An analysis of the inspection of mechanical parts using dense range data. [Internet] [Doctoral dissertation]. University of Edinburgh; 1996. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/1842/21612.

Council of Science Editors:

Bispo EM. An analysis of the inspection of mechanical parts using dense range data. [Doctoral Dissertation]. University of Edinburgh; 1996. Available from: http://hdl.handle.net/1842/21612

22. Pask, Frederick. Systematic engineering of industrial ovens.

Degree: Thesis (Eng.D.), 2017, University of Surrey

URL: http://epubs.surrey.ac.uk/813216/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.703546

► This research is aimed at improving low-grade industrial ovens (less than 250°C) in the manufacturing industry. Industrial ovens have a significant bearing on the environmental… (more)

▼ This research is aimed at improving low-grade industrial ovens (less than 250°C) in the manufacturing industry. Industrial ovens have a significant bearing on the environmental and economic impacts of a manufacturing factory due to their excessive fossil fuel consumption and influence on product quality. Therefore, this thesis’ research question is: 'How can manufacturers improve the environmental and economic performance of industrial ovens?' Research on industrial oven improvement is under-developed and there are significant improvement opportunities within many industrial-heating processes. Manufacturers traditionally prioritise economic assessment when evaluating capital investment projects and it is important that systematic engineering of industrial ovens align energy saving and process enhancement with key business interests. Furthermore, there is a need to incorporate stakeholder perspectives when improving oven processes. This thesis consists of three bodies of research, which all develop ways to improve the environmental and economic performance of industrial ovens: 1) Energy saving through process optimisation, 2) Process enhancement considering both energy consumption and product quality, 3) Developing sustainable industrial ovens. The key research outputs from this thesis are shown below: • There are two options to reduce energy consumption; to optimise the process by changing parameters, or to innovate the process by changing the way the heat is supplied to an oven. • System airflow can often be reduced by up to 30%. This was demonstrated at two factories and three oven systems, and has reduced gas energy consumption by 4,536,000 kWh and cut carbon emissions by 836 tCO2e per year. This has delivered a combined annual cost saving of £121,000. • Installing sufficient control capability enables heating processes to be optimised throughout their life, to meet changing requirements. • A novel approach of polymer cure characterisation has been developed that combines DMTA and a free phenol/CIE-Lch test. This demonstrated that temperature variation within a festoon oven results in dramatically different cure conversion (complete conversion time ranges from 73 to 40 minutes depending on location) and product quality. • A novel multi-criteria analysis method incorporating sustainability indicators from stakeholder’s perspectives has been developed for oven optimisation. • Retrofitting gas-fuelled processes with biomass technology is not economically viable. Alternative schemes that negate capital cost from the business would significantly enhance biomass viability. • Biomass technology is more viable in newly-built processes than retrofit scenarios. • EU Emission Trading Scheme (ETS) is an effective tool to encourage uptake of biomass heating technology in the manufacturing industry. This study demonstrates that there is opportunity to improve low-grade heating processes in the manufacturing industry. The environmental and economic performance of industrial ovens can, and should, be improved to help the…

Subjects/Keywords: 670

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APA (6^th Edition):

Pask, F. (2017). Systematic engineering of industrial ovens. (Doctoral Dissertation). University of Surrey. Retrieved from http://epubs.surrey.ac.uk/813216/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.703546

Chicago Manual of Style (16^th Edition):

Pask, Frederick. “Systematic engineering of industrial ovens.” 2017. Doctoral Dissertation, University of Surrey. Accessed January 24, 2021. http://epubs.surrey.ac.uk/813216/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.703546.

MLA Handbook (7^th Edition):

Pask, Frederick. “Systematic engineering of industrial ovens.” 2017. Web. 24 Jan 2021.

Vancouver:

Pask F. Systematic engineering of industrial ovens. [Internet] [Doctoral dissertation]. University of Surrey; 2017. [cited 2021 Jan 24]. Available from: http://epubs.surrey.ac.uk/813216/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.703546.

Council of Science Editors:

Pask F. Systematic engineering of industrial ovens. [Doctoral Dissertation]. University of Surrey; 2017. Available from: http://epubs.surrey.ac.uk/813216/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.703546

University of Edinburgh

23. Guo, Li. Enacting a decentralised workflow management system on a multi-agent platform.

Degree: PhD, 2007, University of Edinburgh

URL: http://hdl.handle.net/1842/24658

► This thesis presents sets of technologies for enacting multi-agent based decentralised workflow systems. Its purpose is to tackle some of the existing problems in the… (more)

▼ This thesis presents sets of technologies for enacting multi-agent based decentralised workflow systems. Its purpose is to tackle some of the existing problems in the conventional workflow research from the system architectural and engineering point of view. Some of the problems addressed at the beginning of this thesis have affected the wide deployment of workflow management system in an open environment (internet). This thesis argues that most of these problems are caused by the huge conceptual gap and design rationale between high level application requirements and low level system design/implementation. Specifically, it is argued that the conventional system architecture of workflow management system (client-server) could be replaced by a multi-agent based platform which is more open, collaborative and can better reflect workflow’s distributed features in the open environment. Combining existing workflow design rationale and multi-agent computing technology, a multi-agent based decentralised workflow approach is proposed in this thesis. The architecture of the intended system removes both the centralised data storage and the centralised workflow engine from the system. To achieve this goal, approaches that bridge the gap between the business process modelling and multi-agent interaction protocol production are proposed using three different techniques (namely functional properties based specifications verification, syntax based language mapping and interpretation based communication) according to the different types of business process models used. Based on such approaches, the mechanisms for decentralised process execution are explored. Moreover, our system is also able to be extended to support incompletely/partially specified processes in a distributed manner. The approach for handling such incomplete/partially specified processes at run-time are presented in this thesis. The main contributions of this research are to provide approaches for enabling decentralised workflow systems in an open environment based on a multi-agent platform without changing the conventional workflow design rationale and with maximum use of existing process models and tools.

Subjects/Keywords: 670

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APA (6^th Edition):

Guo, L. (2007). Enacting a decentralised workflow management system on a multi-agent platform. (Doctoral Dissertation). University of Edinburgh. Retrieved from http://hdl.handle.net/1842/24658

Chicago Manual of Style (16^th Edition):

Guo, Li. “Enacting a decentralised workflow management system on a multi-agent platform.” 2007. Doctoral Dissertation, University of Edinburgh. Accessed January 24, 2021. http://hdl.handle.net/1842/24658.

MLA Handbook (7^th Edition):

Guo, Li. “Enacting a decentralised workflow management system on a multi-agent platform.” 2007. Web. 24 Jan 2021.

Vancouver:

Guo L. Enacting a decentralised workflow management system on a multi-agent platform. [Internet] [Doctoral dissertation]. University of Edinburgh; 2007. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/1842/24658.

Council of Science Editors:

Guo L. Enacting a decentralised workflow management system on a multi-agent platform. [Doctoral Dissertation]. University of Edinburgh; 2007. Available from: http://hdl.handle.net/1842/24658

University of Edinburgh

24. Cranefield, Stephen John Scott. Planning for behaviour-based robotic assembly : a logical framework.

Degree: PhD, 1991, University of Edinburgh

URL: http://hdl.handle.net/1842/23820

► This thesis describes an approach to robotic assembly planning based on a logic of plan specification formulae. These formulae consist of a term representing the… (more)

Subjects/Keywords: 670

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APA (6^th Edition):

Cranefield, S. J. S. (1991). Planning for behaviour-based robotic assembly : a logical framework. (Doctoral Dissertation). University of Edinburgh. Retrieved from http://hdl.handle.net/1842/23820

Chicago Manual of Style (16^th Edition):

Cranefield, Stephen John Scott. “Planning for behaviour-based robotic assembly : a logical framework.” 1991. Doctoral Dissertation, University of Edinburgh. Accessed January 24, 2021. http://hdl.handle.net/1842/23820.

MLA Handbook (7^th Edition):

Cranefield, Stephen John Scott. “Planning for behaviour-based robotic assembly : a logical framework.” 1991. Web. 24 Jan 2021.

Vancouver:

Cranefield SJS. Planning for behaviour-based robotic assembly : a logical framework. [Internet] [Doctoral dissertation]. University of Edinburgh; 1991. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/1842/23820.

Council of Science Editors:

Cranefield SJS. Planning for behaviour-based robotic assembly : a logical framework. [Doctoral Dissertation]. University of Edinburgh; 1991. Available from: http://hdl.handle.net/1842/23820

University of Edinburgh

25. Mill, Frank. Shape and topology optimisation for manufactured products.

Degree: PhD, 2003, University of Edinburgh

URL: http://hdl.handle.net/1842/12659

► The work described represents the candidate’s research in the area of engineering component representation, particularly in the context of constrained optimisation. Early papers describe a… (more)

Subjects/Keywords: 670

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APA (6^th Edition):

Mill, F. (2003). Shape and topology optimisation for manufactured products. (Doctoral Dissertation). University of Edinburgh. Retrieved from http://hdl.handle.net/1842/12659

Chicago Manual of Style (16^th Edition):

Mill, Frank. “Shape and topology optimisation for manufactured products.” 2003. Doctoral Dissertation, University of Edinburgh. Accessed January 24, 2021. http://hdl.handle.net/1842/12659.

MLA Handbook (7^th Edition):

Mill, Frank. “Shape and topology optimisation for manufactured products.” 2003. Web. 24 Jan 2021.

Vancouver:

Mill F. Shape and topology optimisation for manufactured products. [Internet] [Doctoral dissertation]. University of Edinburgh; 2003. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/1842/12659.

Council of Science Editors:

Mill F. Shape and topology optimisation for manufactured products. [Doctoral Dissertation]. University of Edinburgh; 2003. Available from: http://hdl.handle.net/1842/12659

University of Edinburgh

26. Elder, Anne E. Breathing life into the wooden model : a participant observation study of technical change.

Degree: PhD, 1990, University of Edinburgh

URL: http://hdl.handle.net/1842/27978

► This thesis reports the results of fifteen months of participant observation study of a major technological research and development project. The project, in the area… (more)

Subjects/Keywords: 670

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APA (6^th Edition):

Elder, A. E. (1990). Breathing life into the wooden model : a participant observation study of technical change. (Doctoral Dissertation). University of Edinburgh. Retrieved from http://hdl.handle.net/1842/27978

Chicago Manual of Style (16^th Edition):

Elder, Anne E. “Breathing life into the wooden model : a participant observation study of technical change.” 1990. Doctoral Dissertation, University of Edinburgh. Accessed January 24, 2021. http://hdl.handle.net/1842/27978.

MLA Handbook (7^th Edition):

Elder, Anne E. “Breathing life into the wooden model : a participant observation study of technical change.” 1990. Web. 24 Jan 2021.

Vancouver:

Elder AE. Breathing life into the wooden model : a participant observation study of technical change. [Internet] [Doctoral dissertation]. University of Edinburgh; 1990. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/1842/27978.

Council of Science Editors:

Elder AE. Breathing life into the wooden model : a participant observation study of technical change. [Doctoral Dissertation]. University of Edinburgh; 1990. Available from: http://hdl.handle.net/1842/27978

University of Edinburgh

27. Wren, David Owen. Planning dextrous robot hand grasps from range data, using preshapes and digit trajectories.

Degree: Thesis (D.Sc.), 1997, University of Edinburgh

URL: http://hdl.handle.net/1842/30950

► In this thesis a grasp metric based on stability and kinematic feasibility is introduced. The preshaping paradigm is extended to include consideration of the trajectories… (more)

▼ In this thesis a grasp metric based on stability and kinematic feasibility is introduced. The preshaping paradigm is extended to include consideration of the trajectories that the digits take during closure from preshape to final grasp. The resulting grasp strategy is dependent upon task requirements and is designed for a set of "ideal" object-hand configurations. The grasp strategy couples the degrees of freedom of the dextrous hand in an anthropomorphic manner; the resulting reduction in degrees of freedom makes the grasp planning less complex. Grasp strategies are fitted to real objects by optimisation of the grasp metric; this corresponds to fitting the real object-hand configurations as close to the ideal as possible. First, the preshape aperture, which defines the positions of the fingertips in the preshape, is found by optimisation of an approximation to the grasp metric (which makes simplifying assumptions about the digit trajectories and hand kinematics). Second, the full preshape kinematics and digit closure trajectories are calculated to optimise the full grasp metric. Grasps are planned on object descriptions built from laser striper range data from two viewpoints. A surface description of the object is used to prune the space of possible contact sites and to allow the accurate estimation of surface normals, which is required by the grasp metric to estimate the amount of friction required. A voxel description, built by ray-casting, is used to check for collisions between the object and the robot hand using an approximation to the Euclidean distance transform. Results are shown in simulation for a 3-digit hand model, designed to be like a simplified human hand in terms of its size and functionality. There are clear extensions of the method to any dextrous hand with a single thumb opposing multiple fingers and several different hand models that could be used are described. Grasps are planned on a wide variety of curved and polyhedral objects.

Subjects/Keywords: 670

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APA (6^th Edition):

Wren, D. O. (1997). Planning dextrous robot hand grasps from range data, using preshapes and digit trajectories. (Doctoral Dissertation). University of Edinburgh. Retrieved from http://hdl.handle.net/1842/30950

Chicago Manual of Style (16^th Edition):

Wren, David Owen. “Planning dextrous robot hand grasps from range data, using preshapes and digit trajectories.” 1997. Doctoral Dissertation, University of Edinburgh. Accessed January 24, 2021. http://hdl.handle.net/1842/30950.

MLA Handbook (7^th Edition):

Wren, David Owen. “Planning dextrous robot hand grasps from range data, using preshapes and digit trajectories.” 1997. Web. 24 Jan 2021.

Vancouver:

Wren DO. Planning dextrous robot hand grasps from range data, using preshapes and digit trajectories. [Internet] [Doctoral dissertation]. University of Edinburgh; 1997. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/1842/30950.

Council of Science Editors:

Wren DO. Planning dextrous robot hand grasps from range data, using preshapes and digit trajectories. [Doctoral Dissertation]. University of Edinburgh; 1997. Available from: http://hdl.handle.net/1842/30950

University of Edinburgh

28. El-Kilani, Mohamad Abdullah. A state dependent heuristic method of job shop scheduling.

Degree: PhD, 1992, University of Edinburgh

URL: http://hdl.handle.net/1842/14784

► The main object of this work is to develop a 'Fair Delivery and Shop State Dependent Scheduling dispatching rule' (FDSSD) in a job shop environment.… (more)

▼ The main object of this work is to develop a 'Fair Delivery and Shop State Dependent Scheduling dispatching rule' (FDSSD) in a job shop environment. The fairness principle could be defined by saying that the customers who came first be given a higher priority than those who came afterwards. The basic principle behind the FDSSD rule is fairness towards customers. This is to some extent taken into account by the First Received First Served and Earliest Due Date scheduling rules. The FDSSD rule, however, takes into account both the order in which orders have been received and related delivery dates. Techniques which do not consider both of these criteria can produce unnecessary anomalies. These anomalies can often be overcome by human judgement in a relatively simple situation where results produced by logical scheduling may be immediately seen as unfair. The FDSSD rule introduces this moral element into logical scheduling. Because of this, many more anomalies which could adversely affect customers can be thrown out. The unecessary unfairness within the schedule may not be apparent to management until too much work has been done to change things. Owing to the moral principles introduced within the FDSSD rule, a direct comparison (one to one) with other scheduling rules does not exhibit the complete performance of the FDSSD rule. However, some comparisons based on tardiness criteria are made. Towards this end, a computer simulation model has been developed. The computer model is named herein as 'Job Shop Scheduling Simulation Model' (JSSM). The model has been used in improving the procedure of In-Process scheduling of the FDSSD rule. In contrast to the currently available scheduling rules which tend to be used, the FDSSD rule achieves a balance between the three main objectives of a production system. The objectives are: (i) to meet delivery dates,: (ii) to decrease Work-In-Process (WIP), and (iii) to increase machine utilisation. This balance compromises the Fairness Principle. The FDSSD rule uses First Received First Served rule (FRFS), delivery date consideration and state in the shop. The FDSSD rule offers a very close result if not better than some other known rules such as FRFS, FCFS and EDD rules.

Subjects/Keywords: 670

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APA (6^th Edition):

El-Kilani, M. A. (1992). A state dependent heuristic method of job shop scheduling. (Doctoral Dissertation). University of Edinburgh. Retrieved from http://hdl.handle.net/1842/14784

Chicago Manual of Style (16^th Edition):

El-Kilani, Mohamad Abdullah. “A state dependent heuristic method of job shop scheduling.” 1992. Doctoral Dissertation, University of Edinburgh. Accessed January 24, 2021. http://hdl.handle.net/1842/14784.

MLA Handbook (7^th Edition):

El-Kilani, Mohamad Abdullah. “A state dependent heuristic method of job shop scheduling.” 1992. Web. 24 Jan 2021.

Vancouver:

El-Kilani MA. A state dependent heuristic method of job shop scheduling. [Internet] [Doctoral dissertation]. University of Edinburgh; 1992. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/1842/14784.

Council of Science Editors:

El-Kilani MA. A state dependent heuristic method of job shop scheduling. [Doctoral Dissertation]. University of Edinburgh; 1992. Available from: http://hdl.handle.net/1842/14784

University of Edinburgh

29. Wang, Yongji. Kinematics, motion analysis and path planning for four kinds of wheeled mobile robots.

Degree: PhD, 1995, University of Edinburgh

URL: http://hdl.handle.net/1842/13201

► This dissertation presents a comprehensive and systematic investigation of some fundamental issues relating to creating an autonomous wheeled mobile robot (WMR). The forms of WMRs… (more)

▼ This dissertation presents a comprehensive and systematic investigation of some fundamental issues relating to creating an autonomous wheeled mobile robot (WMR). The forms of WMRs with various structures developed in the past are first classified into four groups according to the method of steering and powering. The four groups are: a. ordinary car-like robots (including passenger cars, single trucks, single unit buses and articulated trucks); b. dual drive robots (dual drive motors with various casters); c. synchro drive and steering robots; and d. omnidirectional robots. The concepts of inverse and direct kinematics widely used in non-mobile manipulators are, for the first time, introduced to WMRs, and a unified treatment of the kinematics for the four kinds of WMRs is presented. A motion feasibility and smoothness analysis for each of them is carried out, revealing the motion characteristics resulting from each of the different mechanical structures. This provides a better understanding of their motion characteristics and forms the basis for discussing the path planning problem. The concept of deviation angle interval is defined and used to explain the strange phenomenon of a pirouette. The conditions and formula for pure translation, pure rotation, straight line motion and circular motion are developed. In order to verify the correctness and to illustrate the advantages of the developed kinematic model, the simulation results from the present model are compared with the existing standards from other kinematic models. Path planning is essential for creating an autonomous robot. Various methods for dealing with the find-path problem have been developed in the past. Based on the motion analysis of the four kinds of WMRs, a critical review of the presently available algorithms for moving a WMR among known static obstacles from a given start location to a given goal location is presented, and the suitability of the existing algorithms to each of the four kinds of WMRs is examined.

Subjects/Keywords: 670

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APA (6^th Edition):

Wang, Y. (1995). Kinematics, motion analysis and path planning for four kinds of wheeled mobile robots. (Doctoral Dissertation). University of Edinburgh. Retrieved from http://hdl.handle.net/1842/13201

Chicago Manual of Style (16^th Edition):

Wang, Yongji. “Kinematics, motion analysis and path planning for four kinds of wheeled mobile robots.” 1995. Doctoral Dissertation, University of Edinburgh. Accessed January 24, 2021. http://hdl.handle.net/1842/13201.

MLA Handbook (7^th Edition):

Wang, Yongji. “Kinematics, motion analysis and path planning for four kinds of wheeled mobile robots.” 1995. Web. 24 Jan 2021.

Vancouver:

Wang Y. Kinematics, motion analysis and path planning for four kinds of wheeled mobile robots. [Internet] [Doctoral dissertation]. University of Edinburgh; 1995. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/1842/13201.

Council of Science Editors:

Wang Y. Kinematics, motion analysis and path planning for four kinds of wheeled mobile robots. [Doctoral Dissertation]. University of Edinburgh; 1995. Available from: http://hdl.handle.net/1842/13201

Loughborough University

30. Whitworth, David P. D. Tension variations in pliable material in production machinery.

Degree: PhD, 1979, Loughborough University

URL: http://hdl.handle.net/2134/8427

► Many production machines are used in which flexible material is processed. In these machines, cyclic tension variations can be induced in the material by interaction… (more)

▼ Many production machines are used in which flexible material is processed. In these machines, cyclic tension variations can be induced in the material by interaction with the machine components. At resonance, these variations can be large and may result in breakage or distortion of the material. It is important to determine these resonant frequencies, and their dependence on the machine parameters, to help avoid these problems at the machine design stage. A mathematical model of such machines has been developed. Materials with linear elastic and linear visco-elastic tensile properties have been considered. The effects of friction between material and guide rollers have been included. A numerical method has been used to solve the resulting differential equations. This method gives accurate results even when adhesion between the material and some machine components is lost. By assuming the tension perturbations proportionately small, an approximate linear model was derived. It was found to give resonant frequencies close to those predicted by the non-linear model, but gave less accurate estimates of the amplitudes at resonance. For the linear model orthogonality relations for the eigenvectors were derived. Using these relations expressions were obtained which are first order approximations to the amplitudes of oscillation at resonance. The amplitudes are related to the angles of wrap round the rollers and, in the visco-elastic case, to the loss factor of the material. In addition, the expressions determine how the amplitudes are related to the position of the corresponding span in the system. Expressions were also found using perturbation theory. They give the local variation of the resonant frequencies with respect to the span lengths and moments of inertia of components of the system. These relations are used to carry out an analysis of certain types of system. Experimental work has been carried out, using a closed loop of material, to test the predictions of the mathematical model. A variety of materials was used with several different systems of rollers. In general, the results show that the resonant frequencies detected corresponded closely with those predicted, but the amplitudes tended to be over-estimated. Finally a programme of work was carried out on a production machine, and the results compared with model predictions.

Subjects/Keywords: 670

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APA (6^th Edition):

Whitworth, D. P. D. (1979). Tension variations in pliable material in production machinery. (Doctoral Dissertation). Loughborough University. Retrieved from http://hdl.handle.net/2134/8427

Chicago Manual of Style (16^th Edition):

Whitworth, David P D. “Tension variations in pliable material in production machinery.” 1979. Doctoral Dissertation, Loughborough University. Accessed January 24, 2021. http://hdl.handle.net/2134/8427.

MLA Handbook (7^th Edition):

Whitworth, David P D. “Tension variations in pliable material in production machinery.” 1979. Web. 24 Jan 2021.

Vancouver:

Whitworth DPD. Tension variations in pliable material in production machinery. [Internet] [Doctoral dissertation]. Loughborough University; 1979. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/2134/8427.

Council of Science Editors:

Whitworth DPD. Tension variations in pliable material in production machinery. [Doctoral Dissertation]. Loughborough University; 1979. Available from: http://hdl.handle.net/2134/8427

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