模態識別與有限元素模型更新

沈祐宇

doi:10.6342/NTU.2014.00689

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模態識別與有限元素模型更新

Modal identification and Finite element model updating

沈祐宇 , Masters　　Advisor：洪振發　　

繁體中文 DOI： 10.6342/NTU.2014.00689

系統識別； ARX模型；模態分析；軌道結構；高架橋；有限元素模型修正； system identification ； ARX model ； modal analysis ； track structure ； viaduct ； finite element model updating

Abstract │ Reference (35) │ Times Cited (1) │ Altmetrics

Abstract 〈TOP〉

Parallel Abstract 〈TOP〉

This research focues on the modal identification of high speed rail structures by ARX model using the vibration test data. By that way, the identified dynamics characteristics of structure were used as reference basis for the updating of the finite element method , in order to reduce the model uncertainties of analysis model.
The parameters of a dynamic system are calculated by least squares method in ARX model using the time-history data, including the external forces (input) and the displacements or acceleration (output) .The nature frequencies, damping ratios and the mode shapes of structure system can be identified. To verify the feasibility of ARX method, the dynamics characteristics of a cantileaver plate model were identified using the input/output data created by numerical simulation.
To grasp the dynamics characters of high speed rail system, the impact model testing was conducted. The dynamic characteristics of rail, truck, and viaduct structures where identified by using the experimental data
To reduce the model uncertainties, the equivalent material parameters of finite element model was adjusted to archieve the minimum difference between the identified and the calculated natural frequencies.

Reference ( 35 ) 〈TOP〉

[1] Burchett,B.T., “Parametric Time Domain System Identification of a Mass-Spring
連結：
-Damper System,” American Society for Engineering Education Annual Conference, 2005.
連結：
[2] Ljung, L., System Identification-Theory for the User , Prentice-Hall ,
連結：
[4] Loh, C.H., Lin, H.M., “Application of Off-Line and On-Line Identification Techniques to Building Seismic Response Data,” Earthquake Engineering and Structural Dynamics, Vol. 25, 1996, pp.269-290.
連結：
[5] Mitra,S. K., Digital Signal Processing, A Computer-Based Approach , 滄海書局, 臺北市, 2003。
連結：

Times Cited (1) 〈TOP〉

余家權(2015)。土層沉陷對路堤軌道系統振動特性影響。臺灣大學工程科學及海洋工程學研究所學位論文。2015。1-120。

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