采棉机后桥减速箱齿轮系统动力学特性研究OA

With the continuous improvement of cotton mechanized recovery efficiency in Xinjiang,the excessive vibration of gear transmission system and tooth breakage of cotton picker occurred frequently.Taking the gear transmission system of the rear axle reduction box of the cotton picker as the research object,Catia software was used to pretreat the gear model,such as single tooth cutting and mesh division,and then Abaqus software was used to carry out gear loading contact analy-sis on the gear pair,and the key nonlinear incentives affecting the dynamic response of the gear were obtained,including time-varying meshing stiffness and transmission error.Based on the finite element node method,a dynamic model inclu-ding the meshing action of rigid rotor,elastic support shaft,support bearing and gear was established.Newmark-beta method was used to analyze the dynamic characteristics of the established dynamic model,calculate the natural frequency of each mode and the corresponding critical speed of the system,and simulate and analyze the vibration response of the node where the gear was located at the speed of the cotton picker.A rear axle vibration response bench test platform was built.By comparing the vibration acceleration test data with the theoretical analysis data,the average error of the root mean square value of the vibration acceleration at each speed was 8.72%,which verified the accuracy of the dynamic model and dynamic analysis.It provided a valuable reference method for solving the nonlinear excitation of gear meshing,such as time-varying meshing stiffness and transmission error,and predicting the dynamic characteristics of gear system of the rear axle reduction box of cotton picker.