Compared with foreign countries, China’s research on the dynamic characteristics of planetary gear train is not backward. Lu Jingjing of Northeast University studies the dynamic characteristics of the gear transmission system of wind power planetary gear reducer, including the establishment of the linear dynamic formula of single-stage planetary gear train and parallel shaft gear in the system, solving the natural frequency of the system with the help of MATLAB, and analyzing the influence of relevant parameters of gears on the dynamic characteristics of the system, It provides a theoretical value range for the design of each component in the wind power gearbox. Zhang Lina of Shandong University studied the dynamic characteristics of single-stage planetary gear train and power split planetary gear transmission system, considered torsional vibration and translational vibration in transverse, radial and axial directions, established nonlinear dynamic differential equations of the system, and analyzed the effects of four types of rigid body vibration, axial torsional vibration of central element, radial translational vibration of central element and planetary gear vibration on the natural frequency of the system, It provides a method to improve the vibration characteristics of the system.
Huang Yi of Beijing University of technology studied the dynamic characteristics of the gear transmission system of a vehicle transmission system. Based on the sensitivity analysis of the response under forced vibration, the most sensitive dynamic parameters to vibration are obtained, which provides a favorable reference for vibration reduction design. Shang Zhen of Beijing University of technology established a nonlinear dynamic model of double floating planetary gear transmission system to study the influence of its main factors on the floating amount. Wang Yan of Wuhan Railway Vocational and technical college adopted the concentrated mass method, considered the nonlinear factors in the system, established the pure torsional nonlinear dynamic equation of the composite planetary gear system in the system, and solved the system by numerical simulation method, which provided a theoretical basis for studying the dynamic characteristics of the composite planetary gear system.
Liang Yanchun of Jiangsu University takes the gear transmission system of a new hybrid electric vehicle power split gearbox as the research object. Using the finite element analysis method, the simulation model of hybrid electric vehicle gear transmission system is established. Combined with the experimental method, the NVH (noise, vibration, sound vibration roughness) performance optimization analysis of electromechanical coupling gear transmission system is carried out. Zhu enyong of Wuhan University mainly takes the composite planetary gear mechanism of hybrid electric vehicle as the research object, studies the dynamics of the composite planetary gear mechanism composed of involute spur gear, solves the natural frequency of the system, and analyzes the influence on the load sharing characteristics of the system by changing the relevant parameters in the system, which provides a theoretical basis for the dynamic design of the system.
Liu Zhenhao of Wuhan University takes the Ravina type composite planetary transmission system as the research object, considers the linear factors of the system, studies its nonlinear dynamics, and establishes the “pure torsion” and “translation torsion” coupling dynamic models of the composite planetary row system composed of helical gears in detail. Combined with experimental verification, it is proved that the method of studying the nonlinear dynamic characteristics of composite planetary gear train is correct. Li Guoyan of Shandong University analyzed the influence of gear crack propagation on natural frequency through the research on the natural characteristics of composite planetary gear train, so as to provide a useful guarantee for the fault diagnosis of planetary gearbox.
Based on the above research status, there are not many research articles and literature on the vibration and noise of planetary gear transmission system, and it is in the initial stage. Most of the studies focus on the dynamic characteristics of single-stage planetary gear mechanism and composite planetary spur gear mechanism. Most of the studies on composite planetary helical gear mechanism also stay in the pure torsional dynamic model. The translational torsional dynamic model of the compound planetary gear train on the vehicle is studied, but the translational vibration of the planetary gear is ignored, and the whole gear transmission system of the actual hybrid electric vehicle is not studied and analyzed.