recurrent formula meaning in Chinese

循环公式

In the process of solving , poles are obtained from recurrent formula , modal vector are obtained from superposition formula not residuary . decoupled equation is derived when vibration source is part correlation , severely coupling appears in the process of input and output then frequency response function cannot directly get according to method mentioned above , decoupling is first problem
当输入完全相关时,频响函数无解,可绕过频响函数,直接运用线性系统的迭加原理来求响应,极点由递归公式得出,模态矢量由叠加公式求出,而不是由留数求得的相应的公式。