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Dissertations / Theses on the topic 'Optimum Design Methods'

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Published: 6 September 2023

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1

Xie, Lei. "Gradient-Based Optimum Aerodynamic Design Using Adjoint Methods." Diss., Virginia Tech, 2002. http://hdl.handle.net/10919/27306.

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Continuous adjoint methods and optimal control theory are applied to a pressure-matching inverse design problem of quasi 1-D nozzle flows. Pontryagin’s Minimum Principle is used to derive the adjoint system and the reduced gradient of the cost functional. The properties of adjoint variables at the sonic throat and the shock location are studied, revealing a logarithmic singularity at the sonic throat and continuity at the shock location. A numerical method, based on the Steger-Warming flux-vector-splitting scheme, is proposed to solve the adjoint equations. This scheme can finely resolve the singularity at the sonic throat. A non-uniform grid, with points clustered near the throat region, can resolve it even better. The analytical solutions to the adjoint equations are also constructed via Green’s function approach for the purpose of comparing the numerical results. The pressure-matching inverse design is then conducted for a nozzle parameterized by a single geometric parameter. In the second part, the adjoint methods are applied to the problem of minimizing drag coefficient, at fixed lift coefficient, for 2-D transonic airfoil flows. Reduced gradients of several functionals are derived through application of a Lagrange Multiplier Theorem. The adjoint system is carefully studied including the adjoint characteristic boundary conditions at the far-field boundary. A super-reduced design formulation is also explored by treating the angle of attack as an additional state; super-reduced gradients can be constructed either by solving adjoint equations with non-local boundary conditions or by a direct Lagrange multiplier method. In this way, the constrained optimization reduces to an unconstrained design problem. Numerical methods based on Jameson’s finite volume scheme are employed to solve the adjoint equations. The same grid system generated from an efficient hyperbolic grid generator are adopted in both the Euler flow solver and the adjoint solver. Several computational tests on transonic airfoil design are presented to show the reliability and efficiency of adjoint methods in calculating the reduced (super-reduced) gradients.
Ph. D.

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2

Kao, Pi-Jen. "Efficient methods for integrated structural-aerodynamic wing optimum design." Diss., Virginia Polytechnic Institute and State University, 1989. http://hdl.handle.net/10919/54211.

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The dissertation is focused on the large computational costs of integrated multidisciplinary design. Efficient techniques are developed to reduce the computational costs associated with integrated structural-aerodynamic design. First efficient methods for the calculations of the derivatives of the flexibility matrix and the aerodynamic influence coefficient matrix are developed. An adjoint method is used for the flexibility sensitivity, and a perturbation method is used for the aerodynamic sensitivity. Second a sequential optimization algorithm that employs approximate analysis methods is implemented. Finally, a modular sensitivity analysis, corresponding to the abstraction of a system as an assembly of interacting black boxes, is applied. This method was developed for calculating system sensitivity without modifying disciplinary black-box software packages. The modular approach permits the calculation of aeroelastic sensitivities without the expensive calculation of the derivatives of the flexibility matrix and the aerodynamic influence coefficient matrix.
Ph. D.

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3

Nattermann, Max [Verfasser], and Ekaterina [Akademischer Betreuer] Kostina. "Numerical Methods of Optimum Experimental Design Based on a Second-Order Approximation of Confidence Regions / Max Nattermann. Betreuer: Ekaterina Kostina." Marburg : Philipps-Universität Marburg, 2015. http://d-nb.info/1068315083/34.

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4

Kircheis, Robert [Verfasser], and Stefan [Akademischer Betreuer] Körkel. "Structure Exploiting Parameter Estimation and Optimum Experimental Design Methods and Applications in Microbial Enhanced Oil Recovery / Robert Kircheis ; Betreuer: Stefan Körkel." Heidelberg : Universitätsbibliothek Heidelberg, 2015. http://d-nb.info/118039657X/34.

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5

Kircheis, Robert [Verfasser], and Stefan [Akademischer Betreuer] Körkel. "Structure Exploiting Parameter Estimation and Optimum Experimental Design Methods and Applications in Microbial Enhanced Oil Recovery / Robert Kircheis ; Betreuer: Stefan Körkel." Heidelberg : Universitätsbibliothek Heidelberg, 2016. http://d-nb.info/1180736540/34.

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6

Ameli, Mostafa. "Heuristic Methods for Calculating Dynamic Traffic Assignment Simulation-based dynamic traffic assignment: meta-heuristic solution methods with parallel computing Non-unicity of day-to-day multimodal user equilibrium: the network design history effect Improving traffic network performance with road banning strategy: a simulation approach comparing user equilibrium and system optimum." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSET009.

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Les systèmes de transport sont caractérisés de manière dynamique non seulement par des interactions non linéaires entre les différents composants, mais également par des boucles de rétroaction entre l'état du réseau et les décisions des utilisateurs. En particulier, la congestion du réseau impacte à la fois la répartition de la demande locale en modifiant les choix d’itinéraire et la demande multimodale globale. Selon les conditions du réseau, ils peuvent décider de changer, par exemple, leur mode de transport. Plusieurs équilibres peuvent être définis pour les systèmes de transport. L'équilibre de l'utilisateur correspond à la situation dans laquelle chaque utilisateur est autorisé à se comporter de manière égoïste et à minimiser ses propres frais de déplacement. L'optimum du système correspond à une situation où le coût total du transport de tous les utilisateurs est minimal. Dans ce contexte, l’étude vise à calculer les modèles de flux d'itinéraires dans un réseau prenant en compte différentes conditions d’équilibre et à étudier l’équilibre du réseau dans un contexte dynamique. L'étude se concentre sur des modèles de trafic capables de représenter une dynamique du trafic urbain à grande échelle. Trois sujets principaux sont abordés. Premièrement, des méthodes heuristiques et méta-heuristiques rapides sont développées pour déterminer les équilibres avec différents types de trafic. Deuxièmement, l'existence et l'unicité des équilibres d'utilisateurs sont étudiées. Lorsqu'il n'y a pas d'unicité, la relation entre des équilibres multiples est examinée. De plus, l'impact de l'historique du réseau est analysé. Troisièmement, une nouvelle approche est développée pour analyser l’équilibre du réseau en fonction du niveau de la demande. Cette approche compare les optima des utilisateurs et du système et vise à concevoir des stratégies de contrôle afin de déplacer la situation d'équilibre de l'utilisateur vers l'optimum du système
Transport systems are dynamically characterized not only by nonlinear interactions between the different components but also by feedback loops between the state of the network and the decisions of users. In particular, network congestion affects both the distribution of local demand by modifying route choices and overall multimodal demand. Depending on the conditions of the network, they may decide to change for example their transportation mode. Several equilibria can be defined for transportation systems. The user equilibrium corresponds to the situation where each user is allowed to behave selfishly and to minimize his own travel costs. The system optimum corresponds to a situation where the total transport cost of all the users is minimum. In this context, the study aims to calculate route flow patterns in a network considering different equilibrium conditions and study the network equilibrium in a dynamic setting. The study focuses on traffic models capable of representing large-scale urban traffic dynamics. Three main issues are addressed. First, fast heuristic and meta-heuristic methods are developed to determine equilibria with different types of traffic patterns. Secondly, the existence and uniqueness of user equilibria is studied. When there is no uniqueness, the relationship between multiple equilibria is examined. Moreover, the impact of network history is analyzed. Thirdly, a new approach is developed to analyze the network equilibrium as a function of the level of demand. This approach compares user and system optimums and aims to design control strategies in order to move the user equilibrium situation towards the system optimum

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7

Demircubuk, Murat. "Design and manufacture of optimum porduct structure /." View online ; access limited to URI, 2005. http://0-wwwlib.umi.com.helin.uri.edu/dissertations/dlnow/3188839.

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8

Vardakos, Sotirios. "Back-analysis methods for optimal tunnel design." Diss., Virginia Tech, 2007. http://hdl.handle.net/10919/26124.

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A fundamental element of the observational method in geotechnical engineering practice is the utilization of a carefully laid out performance monitoring system which provides rapid insight of critical behavioral trends of the work. Especially in tunnels, this is of paramount importance when the contractual arrangements allow an adaptive tunnel support design during construction such as the NATM approach. Utilization of measurements can reveal important aspects of the ground-support interaction, warning of potential problems, and design optimization and forecasting of future behavior of the underground work. The term back-analysis involves all the necessary procedures so that a predicted simulation yields results as close as possible to the observed behavior. This research aims in a better understanding of the back-analysis methodologies by examining both simplified approaches of tunnel response prediction but also more complex numerical methods. Today a wealth of monitoring techniques is available for tunnel monitoring. Progress has also been recorded in the area of back-analysis in geotechnical engineering by various researchers. One of the most frequently encountered questions in this reverse engineering type of work is the uniqueness of the final solution. When possible errors are incorporated during data acquisition, the back analysis problem becomes formidable. Up to the present, various researchers have presented back-analysis schemes, often coupled with numerical methods such as the Finite Element Method, and in some cases the more general approach of neural networks has been applied. The present research focuses on the application of back-analysis techniques that are applicable to various conditions and are directly coupled with a widely available numerical program. Different methods are discussed and examples are given. The strength and importance of global optimization is introduced for geotechnical engineering applications along with the novel implementation of two global optimization algorithms in geotechnical parameter identification. The techniques developed are applied to the back-analysis of a modern NATM highway tunnel in China and the results are discussed.
Ph. D.

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9

Biglari, Farid Reza. "Optimum design of forging dies using finite element method." Thesis, Imperial College London, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.299937.

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10

Tam, Thomas Kam-Hung. "Computer methods for optimal plastic design of frames." Thesis, Queen's University Belfast, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.317120.

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11

Sandhu, Manjinder Kaur. "Optimal designs for mixture models." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1995. http://hub.hku.hk/bib/B31213583.

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12

Jonas, Stephan. "Optimum structural modification with respect to dynamic behaviour." Thesis, Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/13272.

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13

陳令由 and Ling-yau Chan. "Optimal design for experiments with mixtures." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1986. http://hub.hku.hk/bib/B31230799.

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14

Borggaard, Jeffrey T. "The sensitivity equation method for optimal design." Diss., Virginia Tech, 1994. http://hdl.handle.net/10919/38563.

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In this work, we introduce the Sensitivity Equation Method (SEM) as a method for approximately solving infinite dimensional optimal design problems. The SEM couples a trust-region/quasi-Newton optimization algorithm with gradient information provided by apprOXimately solving the sensitivity equation for (design) sensitivities. The sensitivity equation is (in the problems considered here) a partial differential equation (POE) which describes the influence of a design parameter on the state of the system. It is shown that obtaining design sensitivities from the sensitivity equation has advantages over finite difference and semi-analytical methods in that there is no need to remesh or compute mesh sensitivities (even if the domain is parameter dependent), the sensitivity equation is a linear POE for the sensitivities and can be approximated in an efficient manner using the same approximation scheme used to approximate the states. The applicability of the SEM to shape optimization problems, where the state is described by the Euler equations, is studied in detail. In particular, we prove convergence of the method for a one dimensional test problem. These results are used to speculate on the applicability of the method for more complex problems. Finally. we solve a two dimensional forebody simulator design problem (for use in wind tunnel experiments) using the SEM, which is shown to be a very efficient method for this problem.
Ph. D.

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15

丸山, 新一, Shinichi MARUYAMA, 謙善竹内, Kenzen TAKEUCHI, 秀幸畔上, and Hideyuki AZEGAMI. "形状・位相最適化解析の比較検討." 日本機械学会, 2002. http://hdl.handle.net/2237/12174.

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16

青山, 大樹, Taiki AOYAMA, 秀幸畔上, and Hideyuki AZEGAMI. "シェルの面外変動に対する形状最適化." 日本機械学会, 2004. http://hdl.handle.net/2237/12168.

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17

長谷, 高明, Takaaki NAGATANI, 秀幸畔上, and Hideyuki AZEGAMI. "大変形する弾性体の変形後形状を規定した形状同定問題の解法." 日本機械学会, 2003. http://hdl.handle.net/2237/12169.

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18

畔上, 秀幸, and Hideyuki AZEGAMI. "最適化解析の最前線." 日本機械学会, 2001. http://hdl.handle.net/2237/12177.

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19

畔上, 秀幸, Hideyuki AZEGAMI, 易広松浦, Yasuhiro MATSUURA, 新一丸山, and Shinichi MARUYAMA. "音場を対象とした形状最適化問題の解法(車内音低減問題)." 日本機械学会, 2000. http://hdl.handle.net/2237/12181.

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20

畔上, 秀幸, Hideyuki AZEGAMI, 久. 井原, Hisashi IHARA, 智毅松岡, Noritaka MATSUOKA, 昌利下田, Masatoshi SHIMODA, 勝彦渡邊, and Katsuhiko WATANABE. "材料非線形性と幾何学的非線形性を考慮した形状最適化問題." 日本機械学会, 2000. http://hdl.handle.net/2237/12182.

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21

畔上, 秀幸, Hideyuki AZEGAMI, 易広松浦, and Yasuhiro MATSUURA. "音場を対象とした形状最適化問題の解法（コンサートホール問題）." 日本機械学会, 2000. http://hdl.handle.net/2237/12183.

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22

畔上, 秀幸, Hideyuki AZEGAMI, 晶宙佐竹, Akihiro SATAKE, 和美児玉, and Kazumi KODAMA. "線形弾性変形を利用したメカニズムの創生." 日本機械学会, 2000. http://hdl.handle.net/2237/12184.

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23

Stevens, Robert E. "Design of optimal cyclers using solar sails." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2002. http://library.nps.navy.mil/uhtbin/hyperion-image/02Dec%5FStevens.pdf.

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Thesis (Aeronautical and Astronautical Engineer)--Naval Postgraduate School, December 2002.
Thesis advisor(s): I. Michael Ross, Dennis Byrnes. Includes bibliographical references (p. 119-120). Also available online.

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24

AZEGAMI, Hideyuki, Kousuke MATSUURA, Hiroki YOSHIOKA, Eiji KATAMINE, 秀幸畔上, 浩佑松浦, 広起吉岡, and 英次片峯. "平均コンプライアンス最小化を目的とした熱弾性場の形状最適化." 一般社団法人日本機械学会, 2011. http://hdl.handle.net/2237/21117.

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25

Zigic, Dragan. "Homotopy methods for solving the optimal projection equations for the reduced order model problem." Thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-11242009-020145/.

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26

下田, 昌利, Masatoshi SHIMODA, 二郎辻, Jiro TSUJI, 康宏神田, Yasuhiro KANDA, 秀幸畔上, and Hideyuki AZEGAMI. "固有振動数制約付き Mindlin 板・シェル構造の重量最小形状設計." 日本機械学会, 2003. http://hdl.handle.net/2237/12172.

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27

下田, 昌利, Masatoshi SHIMODA, 秀幸畔上, Hideyuki AZEGAMI, 二郎辻, Jiro TSUJI, 康宏神田, and Yasuhiro KANDA. "板・シェル構造の固有振動問題に対する形状最適化の数値解法." 日本機械学会, 2002. http://hdl.handle.net/2237/12173.

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28

下田, 昌利, Masatoshi SHIMODA, 秀幸畔上, Hideyuki AZEGAMI, 二郎辻, Jiro TSUJI, 康宏神田, and Yasuhiro KANDA. "板・シェル構造の強度問題のための形状最適化の数値解法（面内変動による形状設計）." 日本機械学会, 2002. http://hdl.handle.net/2237/12175.

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29

下田, 昌利, Masatoshi SHIMODA, 秀幸畔上, Hideyuki AZEGAMI, 二郎辻, Jiro TSUJI, 康宏神田, and Yasuhiro KANDA. "板・シェル構造の面内変動による形状最適化の数値解法." 日本機械学会, 2001. http://hdl.handle.net/2237/12176.

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30

Greaves, Gary Paul. "Modelling and optimal design of loudspeaker diaphragms using numerical methods." Thesis, University of Brighton, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.283536.

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31

Rowlands, H. "Optimum design using the Taguchi method with neural networks and genetic algorithms." Thesis, Cardiff University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.241701.

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32

Coney, William Bowles. "A method for the design of a class of optimum marine propulsors." Thesis, Massachusetts Institute of Technology, 1989. http://hdl.handle.net/1721.1/14207.

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33

山本, 直幸, Naoyuki YAMAMOTO, 秀幸畔上, Hideyuki AZEGAMI, 昌利下田, and Masatoshi SHIMODA. "フレーム構造のノンパラメトリック最適化問題の解法." 日本機械学会, 2001. http://hdl.handle.net/2237/12178.

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34

竹内, 謙善, Kenzen TAKEUCHI, 秀幸畔上, and Hideyuki AZEGAMI. "力法による形状最適化スキームにおける収束性の改善." 日本機械学会, 2001. http://hdl.handle.net/2237/12179.

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35

Andreadis, Apostolos. "An optimal nephelometric model design method for particle characterisation." Thesis, Loughborough University, 2002. https://dspace.lboro.ac.uk/2134/33959.

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Scattering nephelometry is a particle characterisation method applicable to fluid suspensions containing impurities. Solutions derived by the method feature particle classification by size (diameter), volume or texture as well as continuous on-line and in-situ monitoring, The replacement of turbidimeters with nephelometers in many existing turbidity applications could result in suppression of side effects caused by limitations and uncontrolled parameter drifts and satisfaction of problem-defined constraints at virtually no change in implementation cost. A major issue of nephelometric model design is the selection of a mathematical tool suitable for the modelling of the data analysis system.

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36

Korkut, Ahmet Esat. "A Practical Optimum Design Of Steel Structures With Scatter Search Method And Sap2000." Master's thesis, METU, 2013. http://etd.lib.metu.edu.tr/upload/12615682/index.pdf.

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In the literature, a large number of metaheuristic search techniques have been proposed up to present time and some of those have been used in structural optimization. Scatter search is one of those techniques which has proved to be effective when solving combinatorial and nonlinear optimization problems such as scheduling, routing, financial product design and other problem areas. Scatter search is an evolutionary method that uses strategies based on a composite decision rules and search diversification and intensification for generating new trial points. Broodly speaking, this thesis is concerned with the use and application of scatter search technique in structural optimization. A newly developed optimization algorithm called modified scatter search is modified which is computerized in a software called SOP2012. The software SOP2012 is integrated with well-known structural analysis software SAP2000 using application programming interface for size optimum design of steel structures. Numerical studies are carried out using a test suite consisting of five real size design examples taken from the literature. In these examples, various steel truss and frame structures are designed for minimum weight according to design limitations imposed by AISC-ASD (Allowable Stress Design Code of American Institute of Steel Construction). The results reveal that the modified scatter search technique is very effective optimization technique for truss structures, yet its performance can be assessed ordinary for frame structures.

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37

Anthony, David Keith. "Robust optimal design using passive and active methods of vibration control." Thesis, University of Southampton, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.312863.

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38

片峯, 英次, Eiji KATAMINE, 知幸津幡, Tomoyuki TSUBATA, 秀幸畔上, and Hideyuki AZEGAMI. "対流項を考慮した粘性流れ場の形状最適化問題の解法." 日本機械学会, 2003. http://hdl.handle.net/2237/12170.

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39

畔上, 秀幸, Hideyuki Azegami, 昭康高見, and Akiyasu Takami. "逆変分原理に基礎をおく成長ひずみ法 (最大剛性形状解析へのアプローチ)." 日本機械学会, 1990. http://hdl.handle.net/2237/7262.

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40

Noguchi, Yuki. "An optimum structural design methodology for acoustic metamaterials using topology optimization." Kyoto University, 2019. http://hdl.handle.net/2433/242492.

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41

畔上, 秀幸, Hideyuki Azegami, 康弘須貝, Yasuhiro Sugai, 昌利下田, and Masatoshi Shimoda. "座屈に対する形状最適化." 日本機械学会, 2000. http://hdl.handle.net/2237/7234.

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42

AZEGAMI, Hideyuki, Naoshi NISHIHASHI, Eiji KATAMINE, 秀幸畔上, 直志西橋, and 英次片峯. "抗力最小化・揚力最大化を目的とした定常粘性流れ場の形状最適化." 一般社団法人日本機械学会, 2008. http://hdl.handle.net/2237/21115.

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43

Carbas, Serdar. "Optimum Topological Design Of Geometrically Nonlinear Single Layer Lamella Domes Using Harmony Search Method." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12609634/index.pdf.

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Harmony search method based optimum topology design algorithm is presented for single layer lamella domes. The harmony search method is a numerical optimization technique developed recently that imitates the musical performance process which takes place when a musician searches for a better state of harmony. Jazz improvisation seeks to find musically pleasing harmony similar to the optimum design process which seeks to find the optimum solution. The optimum design algorithm developed imposes the behavioral and performance constraints in accordance with LRFD-AISC. The optimum number of rings, the height of the crown and the tubular cross-sectional designations for dome members are treated as design variables. The member grouping is allowed so that the same section can be adopted for each group. The design algorithm developed has a routine that build the data for the geometry of the dome automatically that covers the numbering of joints, and member incidences, and the computation of the coordinates of joints. Due to the slenderness and the presence of imperfections in dome structures it is necessary to consider the geometric nonlinearity in the prediction of their response under the external loading. Design examples are considered to demonstrate the efficiency of the algorithm presented.

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44

Lee, Gwo Yann, and 李國晏. "Optimum Design of Power DMOS Devices Using Response Surface Methods." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/15117702138471616298.

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45

Lai, Yuan-Yu, and 賴源育. "Optimum Design of Power IGBT Devices Using Response Surface Methods." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/75542832510416698705.

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碩士
逢甲大學
電機工程學系
87
Power semiconductor devices IGBT have undergone a remarkable development in recent years that is rapidly being incorporated into the power electronic applications. The purpose of this project is to develop the IGBT spice model, to design the optimum IGBT device and to verify experimentally the IGBT device and to make the IGBT model available to power electronic circuit designers. The spice model is based upon the fabrication simulator SSUPREM IV, the device simulator ATLAS II, which simulate the static and dynamic characteristics, and the parameter extraction methodology, which extract the spice parameters. The IGBT device (CM20TF-12H) connected to external circuits is evaluated for the static characteristics. The IGBT device model is verified by comparing the experimental data with the simulation data of SPICE. The design of experiment (DOE) with the response surface method (RSM) is used to optimize the IGBT performance and to investigate the relationships with the device parameters. With the aid of DOE, the characteristic of IGBT device will be simulated and studied in detail.

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46

Chen, Chia-Jen, and 陳嘉仁. "OPTIMUM NOISE REDUCTION DESIGN OF CD-ROMS BY USING TAGUCHI’S METHODS." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/rj4czc.

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碩士
大同大學
機械工程學系(所)
95
With development of information technology, high speed of CD-ROMs is manufactured. However, the issue of vibration and noise is focused with increase of the rotational speed. Therefore, to investigate the noise mechanism of CD-ROMs and to reduce the noise of CD-ROMs are important engineering issues. The optical storage device is changed dramatically: from CD-ROMs to DVD-ROMs and the latest blue DVDs with development of information industry. The new technology increases the storage capacity and read/write speed. The improvement of read/write speed not only depends on the new technologies and software, but also depends on the spindle motor, which is a key mechanical component. The rotation speed of spindle motor is limited to the maximum speed of 10,000RPM because high rotation speed may causes damage of CDs. There are two sources of the noises resulting from the CD-ROMs spinning at a high speed. The first source is the aerodynamic noise of the vibration of the disc due to the airflows of the high-speed spinning disc. The second source is the structural noise of the axle motor of the CD-ROMs vibrating with the joint base. In order to reduce noise, the choice and location of absorption materials, and the gap between CDs and plates are considered in this research. Besides, Taghchi methods and MINITAB are used to identify the optimal designs, and the comparison between calculations and experiments is mentioned in this research.

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47

Lin, Chin-Ho, and 林晉禾. "Optimum Analysis of Bicycle Frame by Uniform Design andKriging Interpolation Methods." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/97959917459829500096.

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碩士
國立高雄第一科技大學
機械與自動化工程研究所
99
In this research, the parameter programming is presented by using the uniform experimental design. The finite element software ANSYS/LS-DYNA is used to analyze shock resistance test of a bicycle frame. Using Kriging interpolation method, both response surfaces and mathematic models are built. Besides, through nonlinear programming of MATLAB, it is figured out the best specification of the bicycle frame, which fits on the shock resistance test and the nature frequency of a bicycle frame. Take the factors of uniform experimental design as input, and the bicycle frame mass and the first nature frequency as output to build Kriging models of bicycle frame, the front fork distortion and the nature frequency. In order to reduce the mass of bicycle frame and increase the first nature frequency, let the distortion of the front fork to be the constraint in this paper. Using the toolbox of MATLAB nonlinear program, the best combination parameters of bicycle frame are obtained with the different boundaries of distortion.

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48

Liu, Jing-Wen, and 劉敬文. "Optimum Design of Structures by Methods of Genetic Algorithm and Linear Programming." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/50986249259710021341.

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碩士
淡江大學
航空太空工程學系碩士班
98
Genetic Algorithm (GA) system and Sequential Linear Programming (SLP) were used for structural optimization in this study. The advantage of Genetic Algorithm is that it has multi-point search strategy instead of one-point search to find the global optimum in a space. The ability of Genetic Algorithm is that it can jump over the local optimum and obtain the global optimum. After the solution of Genetic Algorithm was obtained, we can use Sequential Linear Programming to find whether there is a better solution. Since sensitivity can provide the optimal search direction,the central difference method was used in sensitivity analysis. A systematic program which combined APDL of ANSYS with FORTRAN to calculate sensitivity and necessary data for GA and SLP was developed in this study. Optimum design of different structures will be analyzed in numerical examples. The optimum design of structures by the improved methods of GAand SLP were proved to be better than other references in this study.

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49

Wu, Ming-Tsung, and 吳銘宗. "Study of Predictor-Corrector Methods for Optimum Blank Design of Sheet Metal Forming." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/38567339300889385012.

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博士
淡江大學
機械與機電工程學系博士班
95
This thesis discusses the optimization analysis of the blank geometry profile in square cup and cylindrical cup of the metal forming. Using the explicit dynamic finite element method to carry on the numerical simulation, cooperate with streamline method, true strain method and adaptive network fuzzy inference system(ANFIS) three optimization theory to predict the shape of optimum blank. With this way, can be save a lot of time than using “Try and Error” and repeating experiments. In order to ask the verification of the numerical simulation and optimization theory, that to design the multi-form experiment mould in accordance with the condition and restriction of the multi-formly forming. After it made forming in order to verify the numerical simulation relation between reason the geometry measurement of the blank, the loading of the punch and stroke and the thickness distribute of the blank. Compare via number value between analysis and experimental result, shows that explicit dynamic finite element could correctly simulation of situation during forming process of blank form comparing numerical analysis data and experimental data. The adaptive network fuzzy inference system of the optimization theory is the best to can effective and fast to get the optimization of the blank. Moreover, it can to supply optimization reference when making process and designing mold. Finally, it reduces the research and development of products channel into the technology of CAE/CAD in the micro cylindrical cup, that wish to substitute for testing in fact consuming time with computer simulation. Then probe into comparing to the important parameter of micro forming (size effect and stress-strain curve). Channel the thickness of the blank and grain size into material stress strain equation in size effect, and ask the way of solving to seek the proper conjecture value with number value. In the hope of making can predict stress-strain curve of the different material thickness and different grain size with the material through the single revising type. Than comparison between the error of size effect factor equation and simple stress strain equation form all in permitting range through result, so can provable revise equation dependability. And whether it give in accordance with revising type different material thickness and different grain size definitely estimate it each relevant materials after forming in advance coming, can offer the reference of relevant micro forming.

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50

于殿聖. "An Improved Thermal Effect of Power IGBT Devices Using Response Surface Methods and Optimum Design." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/96923184262922107019.

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碩士
逢甲大學
電機工程學系
89
The Insulated Gate Bipolar Transistor (IGBT) is applicative in the power electronic applications because it has advantages of the high speed and high input impedance of MOSFETs, and low saturated voltage of BJTs. IGBT may be damaged by the high temperature caused by the high voltage and high current within the device. The purpose of this project is using the IGBT response surface method (RSM) to design the IGBT thermal effect model. The IGBT model is based upon the VLSI CAD software, which simulate the dynamic switch characteristics, and the parameter extraction methodology, which extracts the parameters of device junction temperature and dynamic switch output characteristics . The design of experiment (DOE) with the RSM is used to optimize the heat-resistant IGBT structure and to investigate the relationships with the device parameters.

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