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应用动力学基本原理建立直升机的动力—传动—旋翼系统的动力学扭振方程，以此获得系统的理论动态特性参数。根据该参数确定试验方案，对系统进行静、转动态试验，获得试验响应数据。结合具体的结构特性及载荷特性选择ＩＴＤ时域分析法进行模态参数识别，获得系统的扭振模态参数（静、转动态），所得的结果与利用频域分析法获得的结果相比较为一致，进而从理论和试验上证明了动频的存在。
The dynamic torsional vibration equation of the power-transmission-rotor system of the helicopter is established based on the basic principles of dynamics to obtain the theoretical dynamic characteristic parameters of the system. According to the parameters to determine the test program, the system static and rotational dynamic test to obtain the test response data. Combined with the specific structural characteristics and load characteristics, ITD time-domain analysis method was used to identify the modal parameters, and the torsional vibration mode parameters (static and rotational state) of the system were obtained. The obtained results were compared with those obtained by the frequency domain analysis Consistent, and then from the theory and experiment proved the existence of the moving frequency.