臺灣博碩士論文加值系統

本論文主要以多體系統之高速加工機構的工具機主結構、以及 工具機的傳動機構為分析對象，提出一套運用智能化虛擬工具機工程分析技術改善高速加工機構振動、以及測試機構與結構動態剛性的研究方法與應用技術。本論文也討論高速加工機構的撓性零件耦合加工時的傳動機構與工具機主結構的撓性振動變形對估算各種力量的動態影響， 除了使用 RecurDyn/Mesh分析軟體去設定硬軌或線軌機台的有限元素模型，模擬結構系統的部分零組件從剛體轉換為撓性體，討論其共振頻率、模態振型和阻尼等，並且透過RecurDyn/Professional 分析軟體，使高速加工機構能在仿真的情況下模擬結構移動時所產生慣性振動對床台的動態影響以及接觸應力。此外針對數值分析模型探討高速加工機構的結構元件之間的接合接觸方式對整機結構動態特性所造成的影響，進而與不同振動模態分析軟體的分析結果相互比較分析，作為廠商設計與製造的參考。針對本論文所發展出的智能化虛擬模型工程分析技術與方法對於高速加工機構的傳動機構與工具機主結構之傳動力量對於其結構與機構動態剛性以及加工精度的影響，並且提出適當的最佳化設計與制振穩態控制方法。

The main objective of this thesis is to provide the intelligent virtual model engineering analysis techniques to reduce the manufacturing vibration of high-speed manufacturing mechanism, especially focus on the transmission mechanisms and main structures. This thesis will discuss the deformation of the flexible vibration caused by the flexible part of the high-speed manufacturing mechanism under moving processes between transmission mechanism and main supported structure. The dynamic effects of vibration caused by different forces can also be simulated. By using RecurDyn/Mesh analysis software to setup a finite element model for hard-track or linear-guideway virtual model, the bodies simulated by structural analysis will become the meshed flexible bodies. In this thesis, we will discuss the resonance frequencies, mode shapes and damping properties of the flexible mechanisms. The tool of RecurDyn analysis software can simulate the moving structures caused by the inertial vibration on the dynamic effects and contact stress of the high-speed manufacturing mechanism. The different joints between the structural components of the high-speed manufacturing mechanism can use the numerical analysis methods to calculate the dynamic characteristics of the structure components effectively. By using the computational ability and simulation of mini server-computer, the dynamic responses, dynamic stress distribution and modal data of high-speed manufacturing mechanism can be calculated and performed. These data can be used as the design and manufacturing references of corresponding manufacturers. In the computer numerical analysis of the rigid and flexible parts of transmission mechanisms and main structures, the virtual model can be combined with appropriate control rules by using the CAE techniques developed in this thesis. Dynamic transmission forces and dynamic responses of high-speed manufacturing mechanism will be calculated and compared with the actual vibration due to the moving inertia and external forces. In this investigation, the under-developing intelligent virtual model engineering analysis techniques of high-speed manufacturing mechanism components will be discussed on the effects of the forcing vibration to the moving errors with appropriate control rules. The optimum design, control algorithm and improvements of the dynamic contact characteristics and steady-state control methods of high-speed manufacturing mechanism will also be developed in this thesis.

Table of Contents
Chapter Description Page no.
Chinese Abstract ………………………………………………………….……………. i
English Abstract ………………………………………………………….……………. ii-iii
Acknowledgement ………………………………………………………….……………. iv
Table of Contents ………………………………………………………….……………. v-vi
List of Tables ………………………………………………………….……………. vii-viii
List of Figures ………………………………………………………….……………. ix-xii
Symbols ………………………………………………………….……………. xiii-xiv
Chapter 1 Introduction………………………………………………..…………... 1-6
Chapter 2 Literature Review……………………………….…………..………… 7-29
2.1 Multibody systems…………………………………..………….…….. 7-9
2.2 Finite Element Analysis (FEA)…………………….....……...……….. 10-12
2.2.1 FFlex…………………………………………………..….…………… 11
2.2.2 RFlex…………………………………………………….……………. 12
2.3 Modal analysis……..………………………………………………….. 12-17
2.4 Contact mechanism………………………………………...………….. 18-21
2.4.1 Contact formulation……………………………………......………….. 19-21
2.4.2 Friction formulation……….……………………………...……..…….. 21
2.5 Durability analysis…………………………………………………….. 21-29
2.5.1 Materials………………………………………………………...…….. 21-22
2.5.2 Deformation……………………...……………………………...…….. 22-26
2.5.3 Fatigue analysis………………..………………………………...…….. 26-29
Chapter 3 Virtual machine simulation……….………………….………………... 30-47
3.1 Ball screw drive simulation…………………………...……………….. 30-31
3.2 Auto Design optimization………………...…..……………………….. 31-37
3.3 Control system……...……………...………………………………….. 37-38
3.4 Results and discussion……...………………………………………….. 39-47
3.4.1 Design parameters study...…………………………………………….. 39-40
3.4.2 Dynamic analysis on flexible deformation…………………………….. 41
3.4.3 Natural frequency……......…………………………………………….. 42-47
Chapter 4 Case Study for Landing Gear…………...………..…….………………. 48-62
4.1 Vibration analysis………………………………………….………….. 50-52
4.2 MFBD…………………………………………………………...…….. 52-53
4.3 Inversed pendulum with moving base….…………………….……….. 53-56
4.3 Control stability system……………………………………….……….. 56-57
4.4 Durability analysis…………………………………………………….. 57-59
4.4.1 Fluctuation cyclic stress……………………………………………….. 57-58
4.4.2 Fatigue life…………………………………………………………….. 58-60
4.5 Results and discussion…………………………………………...…….. 61-62
Chapter 5 Case Study for PCB Drilling machine…….…...................…………… 63-73
5.1 Coupling Rigid and Flexible body dynamic by FDR………………….. 63-65
5.5.1 FFlex & RFlex and time step simulation …………………………...….. 63-65
5.5.2 Load and speed ……………………………………………………….. 65-67
5.2 Double cantilever beam……………………….……………………….. 67-70
5.3 Axial force………………….………………………………………….. 70-73
Chapter 6 Conclusions...………………………………...................…………… 74-75
Reference ………………………………………………………….……..………. 76-81
Appendix I Design variables and performance indexes (PIs)……….………..……. 82
Appendix II Design of experiment (DOE) of virtual machine tool .…...……...……. 83
Appendix III Control system of virtual machine tool …….……………...……..……. 84
Appendix IV AutoDesign Optimization of virtual machine tool ……….……..……. 84
Appendix V FFlex and RFlex simulation results of Landing gear …………………. 85-88

Extended Abstract ………………………………………………………….……..………. 89-91

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