비대칭 감쇠 시스템의 고유진동수와 모드의 미분을 구하기 위한 모드법 의 개선

Modified Modal Method for Eigenderivative Analysis of Asymmetric Damped System

  • 문영종 (한국과학기술원 토목공학과) ;
  • 박선규 (성균관대학교 토목공학과) ;
  • 이인원 (정회원 한국과학기술원 토목공학과)
  • 발행 : 2001.09.01

초록

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.

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