| Due to the characteristics of compact structure,large deceleration,light-weighting and high efficiency,it has been widely used in aerospace,shipbuilding,mining machinery,wind power,automobile and national defense.While they transmit power,the problems of vibration and noise of the planetary transmission system are prominent.Excessive vibration is likely to cause loss of equipment and shorten the life cycle.The nonlinear dynamics modeling method of planetary transmission is the premise and basis for solving the excessive vibration and noise of planetary transmission systems,and has been a research hotspot in the field of planetary transmission dynamics.In this paper,the NGW-11 planetary reducer is token as the research object,and the finite element nonlinear dynamic modeling of planetary transmission system is studied.The main research contents are as follows:The radial nonlinear force-displacement formula of cylindrical roller bearings,the axial nonlinear force-displacement formula of deep groove ball bearings and the torsional nonlinear torque-angle formula of deep groove ball bearings are studied.The data and curves of nonlinear force-displacement relationship of various types of bearings involved in NGW-11 planetary reducer are been obtained by MATLAB simulation.Based on the viscoelastic theory,the finite element modal analysis model of NGW-11 planetary reducer are established.The finite element modal calculation is been carried out,and the correctness of the model is verified by modal experiments.The inherent characteristics of the planetary reducer calculated by the finite element modal analysis are been compared with the experimental modal analysis results,and the model is been modified to obtain a finite element model suitable for nonlinear dynamic calculation.A new modeling method for finite element nonlinear dynamics calculation is been proposed by taking into account the nonlinear effect of bearing and gear pair on the system in the process of dynamic calculation.The dynamic response of reducer box and transmission system under specified working conditions is calculated,and the effects of different speeds,bearing clearances and bearing axial and torsional stiffness on the dynamic characteristics of the planetary reducer transmission system are been analyzed.The vibration experiment of the NGW-11 planetary reducer is been carried out.The vibration simulation results are been compared with the vibration experimental results,and it is been verified the validity of the nonlinear dynamic calculation results. |
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