Extraction of normal modes for highly coupled incomplete systems with general damping

S. Y. Chen; M. S. Ju; Y. G. Tsuei

doi:10.1006/mssp.1996.0006

Extraction of normal modes for highly coupled incomplete systems with general damping

S. Y. Chen, M. S. Ju, Y. G. Tsuei

Department of Mechanical Engineering

Research output: Contribution to journal › Article › peer-review

21 Citations (Scopus)

Abstract

A frequency-domain technique to extract the normal modes from a measurement contaminated by noise for highly coupled structures is developed. The relation between the complex frequency response functions (FRFs) and the normal FRFs is derived. An algorithm is developed to calculate the normal modes from the complex FRFs. In this algorithm, only the magnitude and phase data at the undamped natural frequencies are utilised to extract the normal mode shapes so the effect of measurement noise is reduced. In addition, the technique is applicable to either viscous or structural damping. Two experimental examples are employed to illustrate the technique. The results indicate that this technique can extract the normal modes from the experimental FRFs of a highly coupled incomplete system.

Original language	English
Pages (from-to)	93-105
Number of pages	13
Journal	Mechanical Systems and Signal Processing
Volume	10
Issue number	1
DOIs	https://doi.org/10.1006/mssp.1996.0006
Publication status	Published - 1996 Jan

All Science Journal Classification (ASJC) codes

Control and Systems Engineering
Signal Processing
Civil and Structural Engineering
Aerospace Engineering
Mechanical Engineering
Computer Science Applications

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