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FFT-based Spectral Analysis Method for Linear Discrete Structural Dynamics Models with Non-Proportional Damping  

Lee U-sik (인하대학교 기계공학부)
Cho Joo-yong (인하대학교 기계공학과)
Publication Information
Journal of the Korean Society for Railway / v.9, no.1, 2006 , pp. 63-68 More about this Journal
Abstract
This paper proposes a fast Fourier transform(FFT)-based spectral analysis method(SAM) for the dynamic responses of the linear discrete dynamic models with non-proportional damping. The SAM was developed by using discrete Fourier transform(DFT)-theory. To verify the proposed SAM, a three-DOF system with non-proportional viscous damping is considered as an illustrative example. The present SAM is evaluated by comparing the dynamic responses obtained by SAM with those obtained by Runge-Kutta method.
Keywords
Spectral analysis method; Non-proportional damping; Linear discrete structural dynamics model; fast Fourier transforms;
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