Abstract
In Vibro-Acoustic System, [I] complex eigenvalue analysis and [II] CMS (unconstrained mode, without residual) are widely used for eigenvalue analysis. The method [I] needs huge computer resources, but it can obtain the exact eigen value and vector. In the opposite, the method [II] needs fewer resources, but accuracy of eigen-vector is not acceptable in some cases. To improve the accuracy, [III] CMS (unconstrained mode, with residual) can be used. But the method [III] deteriorates the advantage of the method [II], because physical degrees need to be remained in the equation of motion. In this paper, [IV] novel CMS method, based on unconstrained mode and residual mode, is proposed. The required computer resource is less than the methods [III], because the equation of motion is described on the modal coordinates. And the accuracy is better than the method [II]. In this paper, applying the methods [I] [II] and the proposed method [IV] to finite element models, it is shown that the proposed method is one of the effective methods for the eigenvalue analysis of Vibro-Acoustic System.
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