Proceedings of the Korean Society for Noise and Vibration Engineering Conference (한국소음진동공학회:학술대회논문집)
- 2004.11a
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- Pages.530-533
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- 2004
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- 1598-2548(pISSN)
Modified Modal Methods for Sensitivity Analysis of Asymmetric Damped System
비대칭 감쇠 시스템의 민감도 해석을 위한 개선된 모드법
- Moon, Yeong-Jong ;
- Jo, Ji-Seong (POSCO) ;
- Oh, Ju-Won ;
- Lee, In-Won
- Published : 2004.11.01
Abstract
It is well known that many real systems have asymmetric mass, damping and stiffness matrices. In this case, the method for calculating eigenpair sensitivity is different from that of symmetric system. To determine the derivatives of the eigenpairs in asymmetric damped case, a modal method was recently developed by Adhikari. When a dynamic system has many degrees of freedom, only a few lower modes are available, and because the higher modes should be truncated to use the modal method, the errors may become significant. In this paper a procedure for determining the sensitivities of the eigenpairs of asymmetric damped system using a few lowest set of modes is proposed. Numerical examples show that proposed method achieves better calculating efficiency and highly accurate results when a few modes are used.