本文以某航天器太阳电池板模态试验为例,论述了用导纳圆拟合法联机模态识别的原理及其程序的设计,简单介绍了联机模态识别的测试技术和频响数椐的选取原则,还论述了复模态参数识别的迭代方法。文中给出了两种方法的模态识别结果,并进行了比较。 In this paper, a spacecraft solar panel modal test is taken as an example to discuss the principle of admittance circle fitting on-line modal identification and the design of its program. A brief introduction of online modal identification testing technology and frequency response Selection principle, but also discusses the complex modal parameter identification iterative method. The modal identification results of two methods are given and compared.