摘 要：矩阵迭代法是振动系统获得模态的经典的数值方法，通常应用于有限元软件或其他数值分析领域。本文把该方法推广到试验模态技术领域，提出试验模态迭代法，通过假设振型以确定激振力，再激发稳态响应，数次迭代可以获得结构的模态振型。与现行结构共振试验获得模态振型思想完全不同的是，本方法同时调节激振器的激振幅值与相位，经过极少的试验周期，获得振型；振型的纯度仅仅与共振频率的试验精度有关，并且试验实现的复杂性与激振器数量无关。根据本技术进行纯模态共振试验，能极大地降低激振力调整工作量。

Abstract: Modal iteration is a kind of classic technique in solving mode shapes,it is used in FEM software or other numerical area.The paper advanced experimental modal iterative method along with classic numerical modal itera-tion.Exciting force can be introduced by assumptive mode shape and steady response will be seized. It can get proto-type mode shapes.The idea of experimental modal iterative method is compeletely different from current resonance test to get mode shapes.It adjusts amplitude ad phase at same time and needs less test period.Mode shapes purity is re-lated with resonance frequency precision only. The complexity of exciting force adjusting is independent with shaker number. This technique can reduce resonance test work greatly.