当系统具有重频或近频耦合模态时，常规的矩阵摄动法失效。
The ordinary matrix perturbation method fails to deal with the structural system of repeated or closed frequency modes.
本文研究了多组耦合模态结构动力学参数修改的子空间摄动法。
A subspace perturbation method for structural dynamic modification of several groups of coupled-modes vibration systems is studied.
将系统振动模态分为耦合模态与弧立模态，由数组相互耦合的模态张成耦合模态子空间。
The vibration modes are divided into two classes:separated and coupled. The coupled-mode subspace is spanned by the groups of coupled modes.
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