Identification of modal parameters from nonstationary ambient vibration data using the channel-expansion technique

Dar-Yun Chiang, Chang Sheng Lin

研究成果: Article

10 引文 (Scopus)

摘要

The identification of modal parameters from the response data only is studied for structural systems under nonstationary ambient vibration. In a previous paper by the authors, the modal parameters of a system were identified using the correlation method in conjunction with the curve-fitting technique. This was done by working within the assumption that the ambient excitation is a nonstationary white noise in the form of a product model. In the present paper, the Ibrahim time-domain method (ITD) is extended for modal-parameter identification from the nonstationary ambient response data without any additional treatment of converting the original data into the form of free vibration. The ambient responses corresponding to various nonstationary inputs can be approximately expressed as a sum of exponential functions. In effect, the ITD method can be used in conjunction with the channel-expansion technique to identify the major modes of a structural system. To distinguish the structural modes from the non-structural modes, the concept of mode -shape coherence and confidence factor is employed. Numerical simulations, including one example of using the practical excitation data, confirm the validity and robustness of the proposed method for identification of modal parameters from the nonstationary ambient response.

原文English
頁(從 - 到)1307-1315
頁數9
期刊Journal of Mechanical Science and Technology
25
發行號5
DOIs
出版狀態Published - 2011 五月 1

指紋

Laser modes
Correlation methods
Exponential functions
Curve fitting
White noise
Identification (control systems)
Computer simulation

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering

引用此文

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