Dynamic Analysis And Experimental Study Of Confluence Planetary Row Under Steady State And Shock Conditions

As an important part of the integrated transmission of tracked vehicles,the confluent planetary row has the characteristics of compact structure,high transmission efficiency and strong load bearing capacity.The vibration and noise of the planetary row is particularly obvious under complex working conditions,which will directly affect the comprehensive transmission of the vehicle.The performance of the system.Aiming at the vibration problem of the confluent planetary row in the integrated transmission system of tracked vehicles,considering the time-varying meshing stiffness,torsional stiffness,meshing damping,meshing error and other influencing factors,the steady state and impact of the convergent planetary gear transmission system are studied Vibration characteristics under operating conditions,master the influence of different typical operating conditions and structural parameters on the dynamic response characteristics of the confluent planetary row.The research results of this paper have important theoretical support for the vibration and noise reduction,performance optimization and condition monitoring of the convergent planetary row Significance and engineering value.Aiming at the vibration problem of the convergent planetary gear system,this article establishes the dynamic model of the convergent planetary gear system under steady-state and shock conditions,and analyzes the dynamic characteristics of the gear system theoretically;The comprehensive test bench for the vibration of the row gear system has carried out the vibration test of the confluent planetary row under steady state and impact conditions;the method of combining numerical calculation and experimental test has been used to study the variation characteristics of the vibration characteristics of the concentric planetary row gear system.The main research contents are as follows:(1)Based on the basic theory of gear system dynamics,comprehensively considering the time-varying meshing stiffness,meshing error,and shaft bending.The stiffness,meshing damping and other parameters are influenced.The intensive parameter method is used to establish the dynamic model of the convergent planetary gear system under steady-state and impact conditions;.(2)Based on the calculation of the natural frequency of the bus planetary gear system,the system stiffness is subject to the time-varying change in the transmission process.The effects of meshing stiffness and bearing support stiffness on the natural frequency were studied separately,and the resonance speed and potential resonance frequency value of thesystem at different speeds were analyzed in conjunction with the Campbell diagram,and the inherent characteristics of the operation process of the planetary row gear system were revealed.(3)Based on the calculation model of the stiffness of the wheel system built,the paper gives the surface expressions of steady-state excitation and impact excitation respectively.The Newmark method was used to solve the system dynamic differential equations,and the dynamic response characteristics of the bus planetary gear system under different excitation states were analyzed.(4)Establishment of a multi-operating combined planetary row vibration comprehensive test rig,and carried out no-load,constant-speed and constant-load,speed impact The dynamic characteristic test of the convergent planetary gear system under impact and torque shocks,through the time-frequency analysis of the vibration signal collected by the acceleration sensor,the time-domain and frequency-domain characteristics of the gear system under different working conditions and the numerical calculation results are obtained The consistency is good,which verifies the correctness of the dynamic model.