다물체계내 유연체의 국소 동응력 해석

This paper presents the effective method for local dynamic stress analysis of a flexible body in multibody system. The proposed method is the hybrid superposition method combined with flexible multibody dynamic analysis. The method is executed in 3 steps. In the 1st step, time dependent quantities such as dynamic loads, modal coordinates and gross body motion are calculated efficiently through flexible multibody dynamic analysis using finite element models of flexible bodies with low degrees of freedom. In the 2nd step, stress coefficients are obtained precisely through finite element analyses using modal correlated one with large degrees of freedom. In the final step, local dynamic stress time histories are recovered through hybrid superposition. The effectiveness of the proposed method is verified in the numerical example of a mini-bus.