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系統識別號 U0026-0502201014594400
論文名稱(中文) 符合複雜機械需求之微微衛星結構最佳化設計
論文名稱(英文) Structural Optimization of the Double CubeSat Design to Meet High Mechanical Requirements
校院名稱 成功大學
系所名稱(中) 航空太空工程學系碩博士班
系所名稱(英) Department of Aeronautics & Astronautics
學年度 98
學期 1
出版年 99
研究生(中文) 賈何慕
研究生(英文) Jerome Daniel
學號 P46987023
學位類別 碩士
語文別 英文
論文頁數 59頁
口試委員 指導教授-苗君易
共同指導教授-莊智清
口試委員-鄭泗滄
口試委員-郭人爵
中文關鍵字 PACE  CubeSat  結構最佳化  微衛星結構設計 
英文關鍵字 PACE  CubeSat  Structural optimization  Nanosatellite  Satellite Bus Architecture 
學科別分類
中文摘要 微衛星近年已成為使用太空資源與環境時,相當重要的工具,由於經費需求較少,逐漸發展成大學的太空實驗平台。PACE衛星為國立成功大學在台南研發之自主微衛星,主要的任務為提供在太空之姿態控制實驗,而此實驗尚未實現於微衛星上。PACE衛星之結構依循著CubeSat標準規格,其中定義了設計時的尺寸限制與最大重量。此結構體將可延續用於成功大學下一世代的微衛星,以節省經費與研究時間。為達此目的,目前的結構設計必須改良,此為本論文之目的。本論文提出一最佳化的結構體,可提高微衛星對環境的規格,例如增加可用載重、提昇系統自然頻率等。結構設計工具與觀念已有許多相關的研究,也提昇了以電腦輔助設計與結構模擬的可行性。不同部份的結構可透過模擬被改良、修正並評估,而所有的元件可分別組裝,而最終將把所有元件組合完成在一起模擬並進行確認。本論文主要闡述與PACE衛星團隊合作的經驗,並且提供成功大學未來微衛星計畫的平台。
英文摘要 Nanosatellites are useful tools increasingly being developed in universities throughout the world, as they provide an affordable and easy access to space. PACE is the first indigenous nanosatellite developed at the National Cheng Kung University (NCKU) in Tainan, Taiwan. The primary purpose of the PACE mission is to carry out active attitude control experiments in space, which has never been done in a nanosatellite. The structure developed for PACE follows the CubeSat standard. This specifies the dimensions and maximum mass the spacecraft has to meet. For the next generation of NCKU's nanosatellites, the same structure plat-form could be used which would be valuable in terms of cost and of study time. But to allow this, improvements have to be made to the current structure design. This is the purpose of this thesis, which proposes to optimize the structure to meet higher requirements, i.e. increase the available payload mass, elevate the natural frequencies of the system, etc. Structural optimization tools and concepts have been used to carry out most of the study, which implied the use of computer aided design and mechanical simulations. Different parts of the structure have been modified, improved and assessed through the simulations. All these changes can be integrated one by one, and a final design including them all is proposed. The work of this thesis together with the experience gained on PACE provide a precious combination for the future nanosatellite projects of NCKU.
論文目次 1. Introduction 1

2. Background 3
2.1. The CubeSat Standard 3
2.2. PACE Nanosatellite 4
2.2.1. Overview of the PACE Project 4
2.2.2. PACE Structure 4
2.3. Comparison with Similar Designs 5

3. Motivation 8
3.1. Needs and Benefits 8
3.2. Objectives 9

4. Fundamentals of Structural Optimization, Tools and Methodology for the Study 10
4.1. Generalities on Structural Optimization 10
4.1.1. Iterative-intuitive Method 11
4.1.2. Mathematical Design Optimization Method 11
4.1.3. Methods for this Thesis 12
4.2. Finite Element Method 12
4.2.1. Finite Elements 12
4.2.2. Meshing 13
4.3. Simplified Model of PACE 13
4.4. Tools and Parameters for the Thesis 14
4.4.1. Computer Aided Design 15
4.4.2. Simulations and Parameters 15
4.4.3. Analysis, Calculations and Optimization 16
4.5. Methodology of the Thesis 16

5. Optimized Designs 18
5.1. Terminology for the Designs 18
5.2. Optimization of the Frames 19
5.2.1. Interface with the Panels 19
5.2.2. Comparison with the Previous Design 21
5.3. Optimization of the Panels 21
5.3.1. Inner Geometry 22
5.3.2. Reduction of the Thickness 24
5.3.3. Comparison with the Previous Designs 25
5.4. Optimization using Other Materials 26
5.5. Optimization of the Secondary Structures 27
5.5.1. Suggested Design 27
5.5.2. Comparison with the Previous designs 28

6. Conclusions 29
6.1. Discussion of Results 29
6.2. Recommendation for future work 30

Bibliography 31
Appendix 34
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[23] P. Christensen and A. Klarbring, An Introduction to Structural Optimization, Springer, 2009.
[24] W. Spillers and K. MacBain, Structural Optimization. Springer, 2009.
[25] R. Budynas, Advanced Strength and Applied Stress Analysis. McGraw-Hill, 1977.
[26] R. Cook, Concepts and Application of Finite Element Analysis 4th Edition. Wiley, 2001.
[27] H.H. Lee, ANSYS 12.0 course. Engineering Science Department, NCKU, 2009.
[28] A. Scholz, PACE Qualification Vibration Test Specification. NCKU, 2009.
[29] R. Fleeter, Micro Space Craft. The Edge City Press, 1995.
[30] MatWeb, Material Property Data: http://www.matweb.com
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[33] AIAA Aerospace Design Engineers Guide (5th Edition). AIAA, September 2003.
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