In this paper, modal reduction criterion is derived based on the system response taking as the model of Euler Bernoulli beam, editing modal according to the value of modal costs. The conclusion can be used in a large flexible complex structure system.

• 该文以欧拉 -伯努利梁为模型 ,推导出基于系统响应梁的模态截断准则 ,根据模态价值大小取舍模态 ,其结论可推广到大型复杂结构系统。