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Georgia Tech
1.
Ulmer, Richard Marion.
Benchmark description of an advanced burner test reactor and verification of COMET for whole core criticality analysis in fast reactors.
Degree: MS, Mechanical Engineering, 2014, Georgia Tech
URL: http://hdl.handle.net/1853/52222 
► This work developed a stylized three dimensional benchmark problem based on Argonne National Laboratory's conceptual Advanced Burner Test Reactor design. This reactor is a sodium…
(more)
▼ This work developed a stylized three dimensional
benchmark problem based on Argonne National Laboratory's conceptual Advanced Burner Test Reactor design. This reactor is a sodium cooled fast reactor designed to burn recycled fuel to generate power while transmuting long term waste. The specification includes heterogeneity at both the assembly and core levels while the geometry and material compositions are both fully described. After developing the
benchmark, 15 group cross sections were developed so that it could be used for transport code method verification. Using the aforementioned
benchmark and 15 group cross sections, the Coarse-Mesh Transport Method (COMET) code was compared to Monte Carlo code MCNP5 (MCNP).
Results were generated for three separate core cases: control rods out, near critical, and control rods in. The cross section groups developed do not compare favorably to the continuous energy model; however, the primary goal of these cross sections is to provide a common set of approachable cross sections that are widely usable for numerical methods development benchmarking.
Eigenvalue comparison results for MCNP vs. COMET are strong, with two of the models within one standard deviation and the third model within one and a third standard deviation. The fission density results are highly accurate with a pin fission density average of less than 0.5% for each model.
Advisors/Committee Members: Rahnema, Farzad (advisor), Petrovic, Bojan (committee member), Erickson, Anna (committee member).
Subjects/Keywords: ABTR; Heterogeneous benchmark; Hexagonal geometry; Whole-core 3D benchmark problem; Coarse mesh
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APA (6th Edition):
Ulmer, R. M. (2014). Benchmark description of an advanced burner test reactor and verification of COMET for whole core criticality analysis in fast reactors. (Masters Thesis). Georgia Tech. Retrieved from http://hdl.handle.net/1853/52222
Chicago Manual of Style (16th Edition):
Ulmer, Richard Marion. “Benchmark description of an advanced burner test reactor and verification of COMET for whole core criticality analysis in fast reactors.” 2014. Masters Thesis, Georgia Tech. Accessed March 07, 2021.
http://hdl.handle.net/1853/52222.
MLA Handbook (7th Edition):
Ulmer, Richard Marion. “Benchmark description of an advanced burner test reactor and verification of COMET for whole core criticality analysis in fast reactors.” 2014. Web. 07 Mar 2021.
Vancouver:
Ulmer RM. Benchmark description of an advanced burner test reactor and verification of COMET for whole core criticality analysis in fast reactors. [Internet] [Masters thesis]. Georgia Tech; 2014. [cited 2021 Mar 07].
Available from: http://hdl.handle.net/1853/52222.
Council of Science Editors:
Ulmer RM. Benchmark description of an advanced burner test reactor and verification of COMET for whole core criticality analysis in fast reactors. [Masters Thesis]. Georgia Tech; 2014. Available from: http://hdl.handle.net/1853/52222
University of Georgia
2.
Oliwa, Tomasz Michal.
Learning, exploiting and benchmarking problem structures in real-valued evolutionary optimization.
Degree: 2014, University of Georgia
URL: http://hdl.handle.net/10724/28852
► In the context of real-valued evolutionary optimization in high dimensional domains, understanding and exploiting the problem structure can lead to significant improvements in final result…
(more)
▼ In the context of real-valued evolutionary optimization in high dimensional domains, understanding and exploiting the problem structure can lead to significant improvements in final result quality while also lowering the computational
burdens by cutting down evaluation time. This dissertation presents novel approaches for linkage learning and gene sensitivity detection through machine learning methods in the real-valued domains and a proposed idea to jointly represent these measures.
A surrogate-assisted perturbation-check for non-linearity that does not stress the true fitness function is introduced and various machine learning methods are employed and compared in terms of their ability to rank gene importance. Furthermore, novel
surrogate-assisted crossover operators that incorporate linkage knowledge through crossover masks are defined and evaluated on synthetic fitness functions to empirically validate their utility. Finally, a new benchmark with overlapping linkage groups of
increasing size is presented, which provides a platform for comparison of real-valued global optimization algorithms.
Subjects/Keywords: Machine Learning; Evolutionary Computation; Linkage Learning; Problem Structures; Genetic Algorithms; Benchmark
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APA (6th Edition):
Oliwa, T. M. (2014). Learning, exploiting and benchmarking problem structures in real-valued evolutionary optimization. (Thesis). University of Georgia. Retrieved from http://hdl.handle.net/10724/28852
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Oliwa, Tomasz Michal. “Learning, exploiting and benchmarking problem structures in real-valued evolutionary optimization.” 2014. Thesis, University of Georgia. Accessed March 07, 2021.
http://hdl.handle.net/10724/28852.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Oliwa, Tomasz Michal. “Learning, exploiting and benchmarking problem structures in real-valued evolutionary optimization.” 2014. Web. 07 Mar 2021.
Vancouver:
Oliwa TM. Learning, exploiting and benchmarking problem structures in real-valued evolutionary optimization. [Internet] [Thesis]. University of Georgia; 2014. [cited 2021 Mar 07].
Available from: http://hdl.handle.net/10724/28852.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Oliwa TM. Learning, exploiting and benchmarking problem structures in real-valued evolutionary optimization. [Thesis]. University of Georgia; 2014. Available from: http://hdl.handle.net/10724/28852
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Bradford
3.
Maqsood, Shahid.
The scheduling of manufacturing systems using Artificial Intelligence (AI) techniques in order to find optimal/near-optimal solutions.
Degree: PhD, 2012, University of Bradford
URL: http://hdl.handle.net/10454/6322
► This thesis aims to review and analyze the scheduling problem in general and Job Shop Scheduling Problem (JSSP) in particular and the solution techniques applied…
(more)
▼ This thesis aims to review and analyze the scheduling problem in general and Job Shop Scheduling Problem (JSSP) in particular and the solution techniques applied to these problems. The JSSP is the most general and popular hard combinational optimization problem in manufacturing systems. For the past sixty years, an enormous amount of research has been carried out to solve these problems. The literature review showed the inherent shortcomings of solutions to scheduling problems. This has directed researchers to develop hybrid approaches, as no single technique for scheduling has yet been successful in providing optimal solutions to these difficult problems, with much potential for improvements in the existing techniques. The hybrid approach complements and compensates for the limitations of each individual solution technique for better performance and improves results in solving both static and dynamic production scheduling environments. Over the past years, hybrid approaches have generally outperformed simple Genetic Algorithms (GAs). Therefore, two novel priority heuristic rules are developed: Index Based Heuristic and Hybrid Heuristic. These rules are applied to benchmark JSSP and compared with popular traditional rules. The results show that these new heuristic rules have outperformed the traditional heuristic rules over a wide range of benchmark JSSPs. Furthermore, a hybrid GA is developed as an alternate scheduling approach. The hybrid GA uses the novel heuristic rules in its key steps. The hybrid GA is applied to benchmark JSSPs. The hybrid GA is also tested on benchmark flow shop scheduling problems and industrial case studies. The hybrid GA successfully found solutions to JSSPs and is not problem dependent. The hybrid GA performance across the case studies has proved that the developed scheduling model can be applied to any real-world scheduling problem for achieving optimal or near-optimal solutions. This shows the effectiveness of the hybrid GA in real-world scheduling problems. In conclusion, all the research objectives are achieved. Finaly, the future work for the developed heuristic rules and the hybrid GA are discussed and recommendations are made on the basis of the results.
Subjects/Keywords: 006.3; Job Shop Scheduling Problem (JSSP); Genetic Algorithm (GA); Heuristics; Optimisation; Benchmark problems
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APA (6th Edition):
Maqsood, S. (2012). The scheduling of manufacturing systems using Artificial Intelligence (AI) techniques in order to find optimal/near-optimal solutions. (Doctoral Dissertation). University of Bradford. Retrieved from http://hdl.handle.net/10454/6322
Chicago Manual of Style (16th Edition):
Maqsood, Shahid. “The scheduling of manufacturing systems using Artificial Intelligence (AI) techniques in order to find optimal/near-optimal solutions.” 2012. Doctoral Dissertation, University of Bradford. Accessed March 07, 2021.
http://hdl.handle.net/10454/6322.
MLA Handbook (7th Edition):
Maqsood, Shahid. “The scheduling of manufacturing systems using Artificial Intelligence (AI) techniques in order to find optimal/near-optimal solutions.” 2012. Web. 07 Mar 2021.
Vancouver:
Maqsood S. The scheduling of manufacturing systems using Artificial Intelligence (AI) techniques in order to find optimal/near-optimal solutions. [Internet] [Doctoral dissertation]. University of Bradford; 2012. [cited 2021 Mar 07].
Available from: http://hdl.handle.net/10454/6322.
Council of Science Editors:
Maqsood S. The scheduling of manufacturing systems using Artificial Intelligence (AI) techniques in order to find optimal/near-optimal solutions. [Doctoral Dissertation]. University of Bradford; 2012. Available from: http://hdl.handle.net/10454/6322
University of Melbourne
4.
Mahmood, S. M. Faisal.
State-space model identification for modal-based damage detection.
Degree: 2012, University of Melbourne
URL: http://hdl.handle.net/11343/37298
► A modal-based global method for identification, localization and quantification of damage of shear frame structures is presented in this thesis. The method involves identification of…
(more)
▼ A modal-based global method for identification, localization and quantification of damage of shear frame structures is presented in this thesis. The method involves identification of modal parameters from the vibration responses of the structure only (output-only) using a combination of Natural Excitation Technique (NExT) and Eigensystem Realization Algorithm (ERA), and determination of stiffness values using very few identified modes by employing a least squares solution of the eigenvalue problem. Finally, damage is indicated by comparing the stiffnesses of the (possibly) damaged structure with that of the undamaged structure.
The implementation of NExT-ERA requires a reference channel and an order of the state-space model for modal identification, but several limitations of using a single reference channel and a particular order of the state-space model have been identified from the investigation of this study. To overcome the limitations, a new approach called Multi-Reference Based Mode Selection is proposed in this study. The approach makes use of all the available degree-of-freedoms (DOFs) as reference channels, but one at a time, to identify the best representative modes of the structure. An autonomous modal identification algorithm is also developed for fast online application of the approach.
The stiffness values of a shear frame structure can be determined by employing the least squares solution of the eigenvalue problem. Although the solution can be obtained by using a single natural frequency and the corresponding mode shape, it has been found from this study that the errors in the determination of stiffness values are significant when just one mode is used in the calculation. At least two modes are required to determine the stiffness values with reasonable accuracy. Consequently, two modes were used in the determination of stiffness values using the least squares solution of the eigenvalue problem.
The proposed damage detection methodology was implemented on the analytical Phase I and the experimental Phase II of the IASC-ASCE SHM benchmark problem. The negligible errors in the determination of modal parameters affirm that the methodology is robust in the presence of noise, but the methodology is found to be mildly sensitive to modeling errors, and because of that minor damage locations cannot be identified with certainty. Overall, from the investigation, it can be reported that the proposed methodology has an accuracy of around 90% in damage localization, and the determined severities of damages using it are very close to the actual ones.
Subjects/Keywords: damage detection; modal identification; Natural Excitation Technique; NExT; Eigensystem Realization Algorithm; ERA; Multi-Reference Based Mode Selection approach; benchmark problem
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APA ·
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APA (6th Edition):
Mahmood, S. M. F. (2012). State-space model identification for modal-based damage detection. (Masters Thesis). University of Melbourne. Retrieved from http://hdl.handle.net/11343/37298
Chicago Manual of Style (16th Edition):
Mahmood, S M Faisal. “State-space model identification for modal-based damage detection.” 2012. Masters Thesis, University of Melbourne. Accessed March 07, 2021.
http://hdl.handle.net/11343/37298.
MLA Handbook (7th Edition):
Mahmood, S M Faisal. “State-space model identification for modal-based damage detection.” 2012. Web. 07 Mar 2021.
Vancouver:
Mahmood SMF. State-space model identification for modal-based damage detection. [Internet] [Masters thesis]. University of Melbourne; 2012. [cited 2021 Mar 07].
Available from: http://hdl.handle.net/11343/37298.
Council of Science Editors:
Mahmood SMF. State-space model identification for modal-based damage detection. [Masters Thesis]. University of Melbourne; 2012. Available from: http://hdl.handle.net/11343/37298
Università degli studi di Bergamo
5.
Cassader, Marco.
Benchmark Tracking Portfolio Problems with Stochastic Ordering Constraints.
Degree: 2015, Università degli studi di Bergamo
URL: http://hdl.handle.net/10446/62374
► This work debates several approaches to solve the benchmark tracking problems and introduces different orders of stochastic dominance constraints in the decisional process. Portfolio managers…
(more)
▼ This work debates several approaches to solve the benchmark tracking problems and introduces different orders of stochastic dominance constraints in the decisional process. Portfolio managers usually address with the problem to compare their performance with a given benchmark. In this work, we propose different solutions for index tracking, enhanced indexation and active managing strategies. Firstly, we introduce a linear measure to deal with the passive strategy problem analyzing its impact in the index tracking formulation. This measure results to be not only theoretically suitable but also it empirically improves the solution the results. Then, proposing realistic enhanced indexation strategies, we show how to solve this problem minimizing a linear dispersion measure. Secondly, we generalize the idea to consider a functional in the tracking error problem considering the class of dilation, expected bounded risk measures and LP compound metric. We formulate different metrics for the benchmark tracking problem and we introduce linear formulation constraints to construct portfolio which maximizes the preference of non-satiable risk averse investors with positive skewness developing the concept of stochastic investment chain. Thirdly, active strategies are proposed to maximize the performances of portfolio managers according with different investor's preferences. Thus, we introduce linear programming portfolio selection models maximizing four performance measures and evaluate the impact of the stochastic dominance constraints in the ex-post final wealth.
Subjects/Keywords: Benchmark tracking problem; dispersion measure of tracking error; performance measure; linear programming; stochastic dominance constraints; SECS-S/06 - Metodi mat. dell'economia e Scienze Attuariali e Finanziarie
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APA (6th Edition):
Cassader, M. (2015). Benchmark Tracking Portfolio Problems with Stochastic Ordering Constraints. (Thesis). Università degli studi di Bergamo. Retrieved from http://hdl.handle.net/10446/62374
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Cassader, Marco. “Benchmark Tracking Portfolio Problems with Stochastic Ordering Constraints.” 2015. Thesis, Università degli studi di Bergamo. Accessed March 07, 2021.
http://hdl.handle.net/10446/62374.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Cassader, Marco. “Benchmark Tracking Portfolio Problems with Stochastic Ordering Constraints.” 2015. Web. 07 Mar 2021.
Vancouver:
Cassader M. Benchmark Tracking Portfolio Problems with Stochastic Ordering Constraints. [Internet] [Thesis]. Università degli studi di Bergamo; 2015. [cited 2021 Mar 07].
Available from: http://hdl.handle.net/10446/62374.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Cassader M. Benchmark Tracking Portfolio Problems with Stochastic Ordering Constraints. [Thesis]. Università degli studi di Bergamo; 2015. Available from: http://hdl.handle.net/10446/62374
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Texas – Austin
6.
Kang, Jun Won, 1975-.
A mixed unsplit-field PML-based scheme for full waveform inversion in the time-domain using scalar waves.
Degree: PhD, Civil Engineering, 2010, University of Texas – Austin
URL: http://hdl.handle.net/2152/ETD-UT-2010-05-1263
► We discuss a full-waveform based material profile reconstruction in two-dimensional heterogeneous semi-infinite domains. In particular, we try to image the spatial variation of shear moduli/wave…
(more)
▼ We discuss a full-waveform based material profile reconstruction in two-dimensional heterogeneous semi-infinite domains. In particular, we try to image the spatial variation of shear moduli/wave velocities, directly in the time-domain, from scant surficial measurements of the domain's response to prescribed dynamic excitation. In addition, in one-dimensional media, we try to image the spatial variability of elastic and attenuation properties simultaneously.
To deal with the semi-infinite extent of the physical domains, we introduce truncation boundaries, and adopt perfectly-matched-layers (PMLs) as the boundary wave absorbers. Within this framework we develop a new mixed displacement-stress (or stress memory) finite element formulation based on unsplit-field PMLs for transient scalar wave simulations in heterogeneous semi-infinite domains. We use, as is typically done, complex-coordinate stretching transformations in the frequency-domain, and recover the governing PDEs in the time-domain through the inverse Fourier transform. Upon spatial discretization, the resulting equations lead to a mixed semi-discrete form, where both displacements and stresses (or stress histories/memories) are treated as independent unknowns. We propose approximant pairs, which numerically, are shown to be stable.
The resulting mixed finite element scheme is relatively simple and straightforward to implement, when compared against split-field PML techniques. It also bypasses the need for complicated time integration schemes that arise when recent displacement-based formulations are used. We report numerical results for 1D and 2D scalar wave propagation in semi-infinite domains truncated by PMLs. We also conduct parametric studies and report on the effect the various PML parameter choices have on the simulation error.
To tackle the inversion, we adopt a PDE-constrained optimization approach, that formally leads to a classic KKT (Karush-Kuhn-Tucker) system comprising an initial-value state, a final-value adjoint, and a time-invariant control
problem. We iteratively update the velocity profile by solving the KKT system via a reduced space approach. To narrow the feasibility space and alleviate the inherent solution multiplicity of the inverse
problem, Tikhonov and Total Variation (TV) regularization schemes are used, endowed with a regularization factor continuation algorithm. We use a source frequency continuation scheme to make successive iterates remain within the basin of attraction of the global minimum. We also limit the total observation time to optimally account for the domain's heterogeneity during inversion iterations.
We report on both one- and two-dimensional examples, including the Marmousi
benchmark problem, that lead efficiently to the reconstruction of heterogeneous profiles involving both horizontal and inclined layers, as well as of inclusions within layered systems.
Advisors/Committee Members: Kallivokas, Loukas F. (advisor), Stokoe, Kenneth H. (committee member), Tonon, Fulvio (committee member), Ghattas, Omar (committee member), Gonzalez, Oscar (committee member).
Subjects/Keywords: Unsplit-field perfectly matched layers (PMLs); Mixed finite elements; Transient scalar wave simulations; Semi-infinite domains; Inverse problem; Full waveform inversion; PDE-constrained optimization; KKT system; Reduced space approach; Regularization; Marmousi benchmark problem; Attenuation properties
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APA (6th Edition):
Kang, Jun Won, 1. (2010). A mixed unsplit-field PML-based scheme for full waveform inversion in the time-domain using scalar waves. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/ETD-UT-2010-05-1263
Chicago Manual of Style (16th Edition):
Kang, Jun Won, 1975-. “A mixed unsplit-field PML-based scheme for full waveform inversion in the time-domain using scalar waves.” 2010. Doctoral Dissertation, University of Texas – Austin. Accessed March 07, 2021.
http://hdl.handle.net/2152/ETD-UT-2010-05-1263.
MLA Handbook (7th Edition):
Kang, Jun Won, 1975-. “A mixed unsplit-field PML-based scheme for full waveform inversion in the time-domain using scalar waves.” 2010. Web. 07 Mar 2021.
Vancouver:
Kang, Jun Won 1. A mixed unsplit-field PML-based scheme for full waveform inversion in the time-domain using scalar waves. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2010. [cited 2021 Mar 07].
Available from: http://hdl.handle.net/2152/ETD-UT-2010-05-1263.
Council of Science Editors:
Kang, Jun Won 1. A mixed unsplit-field PML-based scheme for full waveform inversion in the time-domain using scalar waves. [Doctoral Dissertation]. University of Texas – Austin; 2010. Available from: http://hdl.handle.net/2152/ETD-UT-2010-05-1263
Universitat Politècnica de Catalunya
7.
Bahar, Arash.
Hierarchical semiactive control of base-isolated structures.
Degree: 2009, Universitat Politècnica de Catalunya
URL: http://hdl.handle.net/10803/31840
► In structural engineering, one of the constant challenges is to find new better means of protecting structures from destructive environmental forces. One approach is seismic…
(more)
▼ In structural engineering, one of the constant challenges is to find new better means of protecting structures from destructive environmental forces. One approach is seismic isolation, which has shown to not only reduce the response of the primary structure, but also reduce damage to equipment and other non-structural secondary elements. A drawback of most isolation systems appears when one considers the response of isolated structures subjected to earthquakes characterized by near-field motions. Such motions are likely to produce large isolation deformations, which may lead to buckling or rupture of isolators. To control these large deformations one way is to utilize supplemental dampers together with the isolation system (a hybrid system). However the benefits of isolation system may be significantly reduced for both moderate and strong earthquakes due to the transfer of energy into higher modes which can result in increased interstory drift and floor accelerations. One approach to improve the performance of an isolation system is to incorporate devices within the isolation system whose properties can be adjusted in real-time during earthquakes. Such devices are referred to as semi-active. The control forces in semi-active systems are developed as a result of the motion of the structure itself. They can only be modified through appropriate adjustment of mechanical properties of semi-active devices.
Furthermore, the control forces act to oppose the motion of the structural system and therefore promote the global stability of the structure.
Specifically the MR dampers appear to have significant potential to advance the acceptance of structural control as a viable means for dynamic hazard mitigation. However, because of the inherent nonlinearity of MR dampers, the first step in the design of a semiactive control is the development of an accurate model of the MR device. The system-identification issue plays a key role in control problems.
The nature of this research is multidisciplinary because it deals with two concepts, identification of a mechanical device (MR damper) as well as a structural control
problem in a civil engineering perspective. As a first step, a new Bouc-Wen based normalized model has been developed to study the behavior of a wider range of MR dampers, specially the devices which can be more effective in the vibration control of real civil engineering structures (large-scale MR dampers). Based on this new model, an extension of a parameter identification method for MR dampers has been proposed. This extension allows to identify a larger class of MR dampers more accurately. The validation of the parameter identification method has been carried out using a black-box model of an MR damper that is a part of a smart base-isolated
benchmark building model available in the community of researchers in structural control. The versatility of the parameter identification method has been tested using the MR damper as a semi-active device under time-varying voltage and earthquake excitation. Then, based on the…
Advisors/Committee Members: Universitat Politècnica de Catalunya. Escola Tècnica Superior d'Enginyers de Camins, Canals i Ports de Barcelona, [email protected] (authoremail), true (authoremailshow), Rodellar, José (director), Barbat, Álex H. (Álex Horia) (codirector), true (authorsendemail).
Subjects/Keywords: MR damper; Semi-active control; Smart base-isolated; Smart base-isolated buildings; Bouc-Wen model; Normalized Bouc-Wen model; Inverse model hysteresis; Near-fault earthquakes; Benchmark problem; 624
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APA (6th Edition):
Bahar, A. (2009). Hierarchical semiactive control of base-isolated structures. (Thesis). Universitat Politècnica de Catalunya. Retrieved from http://hdl.handle.net/10803/31840
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Bahar, Arash. “Hierarchical semiactive control of base-isolated structures.” 2009. Thesis, Universitat Politècnica de Catalunya. Accessed March 07, 2021.
http://hdl.handle.net/10803/31840.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Bahar, Arash. “Hierarchical semiactive control of base-isolated structures.” 2009. Web. 07 Mar 2021.
Vancouver:
Bahar A. Hierarchical semiactive control of base-isolated structures. [Internet] [Thesis]. Universitat Politècnica de Catalunya; 2009. [cited 2021 Mar 07].
Available from: http://hdl.handle.net/10803/31840.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Bahar A. Hierarchical semiactive control of base-isolated structures. [Thesis]. Universitat Politècnica de Catalunya; 2009. Available from: http://hdl.handle.net/10803/31840
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Canterbury
8.
Tomlinson H.
Overall damage identification of flag-shaped hysteresis systems under seismic excitation.
Degree: 2015, University of Canterbury
URL: http://hdl.handle.net/10092/101160
► Copyright © 2015 Techno-Press, Ltd. This research investigates the structural health monitoring of nonlinear structures after a major seismic event. It considers the identification of…
(more)
▼ Copyright © 2015 Techno-Press, Ltd. This research investigates the structural health monitoring of nonlinear structures after a major seismic event. It considers the identification of flag-shaped or pinched hysteresis behavior in response to structures as a more general case of a normal hysteresis curve without pinching. The method is based on the overall least squares methods and the log likelihood ratio test. In particular, the structural response is divided into different loading and unloading sub-half cycles. The overall least squares analysis is first implemented to obtain the minimum residual mean square estimates of structural parameters for each sub-half cycle with the number of segments assumed. The log likelihood ratio test is used to assess the likelihood of these nonlinear segments being true representations in the presence of noise and model error. The resulting regression coefficients for identified segmented regression models are finally used to obtain stiffness, yielding deformation and energy dissipation parameters. The performance of the method is illustrated using a single degree of freedom system and a suite of 20 earthquake records. RMS noise of 5%, 10%, 15% and 20% is added to the response data to assess the robustness of the identification routine. The proposed method is computationally efficient and accurate in identifying the damage parameters within 10% average of the known values even with 20% added noise. The method requires no user input and could thus be automated and performed in real-time for each sub-half cycle, with results available effectively immediately after an event as well as during an event, if required.
Subjects/Keywords: Science & Technology; Technology; Engineering, Civil; Engineering, Mechanical; Instruments & Instrumentation; Engineering; structural health monitoring; flag-shaped hysteresis system; structural parameter identification; least squares; log likelihood ratio; seismic response; system identification; SHM; EXTENDED KALMAN FILTER; LMS-BASED APPROACH; PARAMETER-IDENTIFICATION; BENCHMARK PROBLEM; MEMORY ALLOYS; STEEL FRAMES; ENERGY; DISPLACEMENT; FLEXIBILITY; CONNECTIONS; 08 Information and Computing Sciences; 09 Engineering; Fields of Research::40 - Engineering::4005 - Civil engineering::400506 - Earthquake engineering; Fields of Research::40 - Engineering::4005 - Civil engineering::400510 - Structural engineering; Fields of Research::40 - Engineering::4005 - Civil engineering::400509 - Structural dynamics
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APA ·
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to Zotero / EndNote / Reference
Manager
APA (6th Edition):
H, T. (2015). Overall damage identification of flag-shaped hysteresis systems under seismic excitation. (Thesis). University of Canterbury. Retrieved from http://hdl.handle.net/10092/101160
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
H, Tomlinson. “Overall damage identification of flag-shaped hysteresis systems under seismic excitation.” 2015. Thesis, University of Canterbury. Accessed March 07, 2021.
http://hdl.handle.net/10092/101160.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
H, Tomlinson. “Overall damage identification of flag-shaped hysteresis systems under seismic excitation.” 2015. Web. 07 Mar 2021.
Vancouver:
H T. Overall damage identification of flag-shaped hysteresis systems under seismic excitation. [Internet] [Thesis]. University of Canterbury; 2015. [cited 2021 Mar 07].
Available from: http://hdl.handle.net/10092/101160.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
H T. Overall damage identification of flag-shaped hysteresis systems under seismic excitation. [Thesis]. University of Canterbury; 2015. Available from: http://hdl.handle.net/10092/101160
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
. 
Open Access Theses and Dissertations