考虑激励幅值慢变的卷绕头转子系统动力学建模OA北大核心CSTPCD

The coupling vibration between the complex rotor system structures of winding head and time-varying frequency excitation make the vibration problem extremely complex. To study its dynamic characteristics more accurately, based on the finite element method, this paper builds the nonlinear rotor system dynamics model of winding head considering the slow change of multi disk mass by using Newmark-β numerical integration method to obtain the dynamic characteristics. The dynamic response is obtained when there are only initial imbalance and additional imbalance caused by poor winding. An analysis of the calculation results of axis trajectory, time domain response and frequency domain response curve shows the winding head rotor system is more sensitive to the slow change of excitation amplitude caused by poor winding, and new frequency components appear. The vibration spectra at different nodes are further compared and analyzed. Our study may lend some theoretical support for the dynamic design and fault identification of winding head rotor system.