Eigenvalue design sensivity analysis of structure using continuum method

J. Ocean Eng. Technol. 1997;11(1):3-9.

연속법에 의한 판구조 고유진동수의 민감도 해석

이재환,장강석,신민용

충남대학교,대우중공업,충남대학교 대학원

Keywords: Design Sensitivity Analysis, Eigenvalue Analysis, FEM, Eigenvalue Reanalysiss

핵심용어: 설계 민감도 해석, 고유치 해석, 유한요소법, 고유치 재해석

Abstract

In this paper, design sensivity of plate natural frequency is computed for thickness design variables. Once the variational equation is derived from Lagrange quation using the virtual displacement, governing energy bilinear form is obtained and sensivity equation is formulated through the first variation. Natural frequency is obtained using the commercial FEM code and the accuracy of sensivity is verified by finite difference. The accuracy of natural frequency and sensivity improves for the fine mesh model.