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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 鍾添東(Tien-Tung Chung) | |
dc.contributor.author | Jhe-Wei Lee | en |
dc.contributor.author | 李哲維 | zh_TW |
dc.date.accessioned | 2021-06-15T05:50:12Z | - |
dc.date.available | 2013-08-01 | |
dc.date.copyright | 2010-08-19 | |
dc.date.issued | 2010 | |
dc.date.submitted | 2010-08-18 | |
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dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/47187 | - |
dc.description.abstract | 本文研究低地板電動大客車底盤之結構分析,並提出對於低地板電動大客車底盤的結構設計與最佳化之方法,以改良靜態結構特性。藉由靜態有限元素分析方法分析大客車底盤的結構特性,本研究對大客車底盤所考慮的靜態有限元素分析包括全負載應力、彎曲剛性及扭矩剛性分析。更改設計的目地是為了以最小重量來提升大客車底盤的強度和剛性,藉由兩階段最佳化來改良複雜的大客車底盤結構。在第一階段最佳化,選取在少數高應力集中位置周圍的元件,接下來計算相關的元件厚度對於被選取元件的應力和重量的敏感度,選取具有較高的應力對重量之敏感比例的元件厚度做為設計變數,然後執行結構最佳化以藉由最小的上升重量來降低高應力集中區域;在第二階段最佳化,選取不在高應力集中位置周圍的較厚元件,接下來計算相關的元件厚度對於被選取元件的剛性和重量的敏感度,選取具有較低的剛性對重量之敏感比例的元件厚度做為設計變數,然後執行結構最佳化來減低底盤重量並保持改良後的強度和原來的剛性;最後,比較原來的和改良的底盤結構的靜態結構特性,並顯示出改良後的底盤為較佳的結構設計。 | zh_TW |
dc.description.abstract | This paper studies the structural analyses of a low-floor electrical bus chassis and presents a method for structural design and optimization of a low-floor electrical bus chassis for improving static structural characteristics. The structural characteristics of the bus chassis are analyzed by static finite element analysis method. The static finite element analyses considered in this research include full-loaded stress, bending stiffness and torsional stiffness analyses for the bus chassis. The redesign purpose is to increase the strength and stiffness of the bus chassis with minimum weight. The complex bus chassis structure is improved by two stage optimizations. In the first stage optimization, components in the neighbor of few locations with high stresses are selected, and then sensitivities of stress and weight of selected components with respect to component thicknesses are computed. Component thicknesses with high sensitivities ratio of stress to weight are chosen as design variables. Then the structural optimization is performed to reduce the high stress regions with minimum increased weight. In the second stage optimization, thick components not in the neighbor of the locations with high stresses are selected, and then sensitivities of stiffness and weight of selected components with respect to component thicknesses are computed. Component thicknesses with low sensitivities ratio of stiffness to weight are chosen as design variables. Then the structure optimization is performed to reduce the chassis weight while maintaining the improved strength and original stiffness. Finally, static structural characteristics of the original and improved chassis structures are compared, and it shows that the improved chassis is a better structural design. | en |
dc.description.provenance | Made available in DSpace on 2021-06-15T05:50:12Z (GMT). No. of bitstreams: 1 ntu-99-R97522611-1.pdf: 7195430 bytes, checksum: 880028e0c2e476796d9ee52fa82c9e16 (MD5) Previous issue date: 2010 | en |
dc.description.tableofcontents | 口試委員會審定書 I
誌謝 II 中文摘要 III Abstract IV Table of content VI List of figures IX List of tables XIV List of symbols or abbreviations XVI Chapter 1 Introduction 1 1.1 Motivation and purpose 2 1.2 Paper review 4 1.3 Research strategy and method 12 1.4 Outline 13 Chapter 2 Basic theories of structural analyses and optimum design 15 2.1 Finite element analysis 16 2.2 Structural stiffness of a chassis 21 2.3 Optimization design 24 Chapter 3 Model construction and finite element analyses of a low-floor electrical bus chassis 31 3.1 Finite element model construction 31 3.2 Full-loaded stress analysis 37 3.3 Bending stiffness analysis 42 3.4 Torsional stiffness analysis 45 Chapter 4 Structural improvement with two stage optimizations for a low-floor electrical bus chassis 49 4.1 Improvement strategy of a low-floor electrical bus chassis 49 4.2 Structural optimization with the stress constraints 53 4.3 Structural lightweight optimization with the stiffness and stress constraints 65 4.4 Comparison between the original and improved bus chassis structures 75 Chapter 5 Conclusions and suggestions 77 5.1 Conclusions 77 5.2 Suggestions 78 References 80 Appendix A Specification of skeleton information 86 Appendix B Locations with high stresses and the related components 87 Appendix C User manual of analysis program for structural analysis 93 C.1 Code description of the mesh model construction 93 C.2 Code description of the full-loaded stress analysis 95 C.3 Code description of the bending stiffness analysis 98 C.4 Code description of the torsional stiffness analysis 100 C.5 Programming example of the structural analysis 102 Appendix D User manual for optimum design 104 D.1 Installer and related parameter description of the structural optimum design program 105 D.2 Code description of the ANSYS macro files for the first stage optimization 109 D.3 Code description of the ANSYS macro files for the second stage optimization 113 D.4 Programming example of the structural optimum design 116 Vitae (個人簡歷) 123 | |
dc.language.iso | en | |
dc.title | 低地板電動大客車底盤之結構分析與最佳化設計 | zh_TW |
dc.title | Structural Analysis and Optimum Design of a Low-Floor Electrical Bus Chassis | en |
dc.type | Thesis | |
dc.date.schoolyear | 98-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 史建中(Chien-Jong Shih),林陽泰(Yang-Tai Lin) | |
dc.subject.keyword | 大客車底盤,電動大客車,有限元素分析,彎曲剛性,扭矩剛性,結構最佳化, | zh_TW |
dc.subject.keyword | bus chassis,electrical bus,finite element analysis,bending stiffness,torsional stiffness,structural optimization, | en |
dc.relation.page | 123 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2010-08-19 | |
dc.contributor.author-college | 工學院 | zh_TW |
dc.contributor.author-dept | 機械工程學研究所 | zh_TW |
顯示於系所單位: | 機械工程學系 |
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