加速度計質量效應模擬分析之評估與驗證

Evaluation and Verification of Accelerometer Mass Effect on Theoretical Simulation

王栢村(Bor-Tsuen Wang) ； 陶致均(Chih-Chung Tao) ； 賴逸少(Yi-Shao Lai) ； 葉昶麟(Chang-Lin Yeh) ； 李英志(Ying-Chih Li)

《中華民國振動與噪音工程學會論文集》 2007 (2007/06) Pp. 61-68

https://doi.org/10.30028/CSSVANNUAL.200706.0061

摘要

本文利用有限元素分析法對印刷電路板進行實驗試驗時之加速度計質量效應進行評估與驗證，並藉由最佳化之材料參數及多種加速度計之模擬方式進行有限元素模型之建構與分析，再將分析結果與實驗結果進行比較驗證。經由有限元素分析中之模態分析及簡諧響應分析可以求得理論之自然頻率、模態振型與頻率響應函數，再由實驗模態試驗中所求得之自然頻率、模態振型與頻率響應函數進行比對，即可獲得加速度計於有限元素分析中之合理模擬方式，並可由分析結果找出更能符合實際結構之整體有限元素模型，進而發展加速度計質量效應模擬技巧於有限元素進階分析，如響應預測時，有較可靠之實驗驗證品質。

關鍵字

印刷電路板 ； 有限元素分析 ； 加速度計

並列摘要

This work applies finite element method (FEM) to study the accelerometer mass effect on print circuit board (PCB) during experimental modal testing. The FE modal considering accelerometer mass by different simulation approaches are presented and optimized to determine the PCB material mechanical properties by the comparison between the theoretical and experimental modal parameters. In FEM, both modal analysis and harmonic response analysis are, respectively, performed to get theoretical natural frequency and mode shapes as well as frequency response functions (FRFs). From experimental modal testing, the corresponding modal parameters and FRFs can also be obtained and used to validate the constructed FE modals including mass effect due to the accelerometer. The most reasonable modeling of the accelerometer mass in conjunction with the PCB FE modal can be found and result in very good agreement with experiments in terms of model parameters and FRFs. The refined PCB modal with the accelerometer mass effect can then be applied to response prediction with better and reliable comparison with experiments and thus improve the simulation accuracy.

並列關鍵字

Printed Circuit Board ； Finite Element Analysis ； accelerometer