公开(公告)号：EP4220105A1

公开(公告)日：2023-08-02

申请号：EP21872625.5

申请日：2021-09-28

申请人： Kyushu University, National University Corporation

发明人： KONDOU Takahiro ,  SUMIKAWA Taiki

IPC分类号： G01H17/00 ,  G01M7/02

摘要： This vibration analysis method is a method for analyzing vibrations of a large-scale system with local strong nonlinearities, and includes a process (1) of applying the new type of complex modal analysis to an equation for a linear state variable to convert the equation to a real modal equation for lower-order modes, and correcting an effect of higher-order modes of the linear state variable from an equation for a nonlinear state variable and eliminating the modes, a process (2) of selecting secondary modes, which have a large effect on a solution of an original large-scale system, from the real modal equation for lower-order modes, and, in relation to secondary modes, which have a small effect, eliminating the modes thereof by incorporating the effect to the equation for nonlinear state variables as a correction term obtained from an approximate solution of the real modal equation for lower-order modes, and deriving the dimension reduced model, and a process (3) of calculating a frequency response by using the dimension reduced model.