本文探讨利用桨叶旋转时自身产生的气动激振力引起的桨叶响应、通过谱分析确定旋转桨叶固有频率的可能性;介绍在一真实直升机上进行测试分析的全过程,包括测试方法、信号的特征分析、判断准则的确定、具体的测试步骤、测量分析结果等;最后提出从实践中得出的几点改进看法。 In this paper, the blade response caused by the aerodynamic excitation force generated by the blade rotation is discussed, and the possibility of rotating the blade natural frequency is determined by spectral analysis. The whole process of testing and analysis on a real helicopter is introduced, including the test method, The characteristic of the signal, the determination of the judgment criterion, the specific test procedure, the result of the measurement and analysis, etc .; Finally, some suggestions of improvement obtained from practice are put forward.