In recent years, with the continuous development of mechanical vibration theory, the research on mechanical system at home and abroad has gradually begun to study the deeper causes of vibration and noise problems from the original strength check, and studies the dynamic characteristics of the system under the premise of considering different excitation factors, different types and different degrees of freedom models.
In view of the object to be studied, the idea of first part and then the whole is analyzed. Firstly, the sealed rotor system considering gear meshing characteristics is divided into transmission system and rotor system, and then the two subsystems are analyzed independently. Finally, the dynamic characteristics of the sealed rotor system considering gear meshing characteristics are studied.
In foreign countries, in 1999, Jian Lin and Parker R G analyzed the inherent characteristics and free vibration characteristics of planetary gear transmission system; in 2001, Kahraman A thinks that when the number of degrees of freedom in the system is small, the pure torsion dynamic model can be established, which is more suitable and convenient in solving and analyzing the dynamic characteristics of the system. Based on the pure torsion model established, the natural vibration characteristics of the components in the planetary gear transmission system are analyzed In the dynamic model of planetary gear transmission system established by G, the time-varying meshing stiffness is simplified as rectangular wave, and the system response under the influence of different parameters is analyzed; in 2007, Al shyyab a et al. Established the dynamic model of pure torsiontransmission system, and solved the dynamic response of the system according to the model; in 2011, bahk CJ According to the dynamic model of the system, a series of nonlinear vibration characteristics caused by parametric excitation were solved In the same year, Ericson t m, Parker R G explored the dynamic characteristics of planetary gear transmission system through experiments, and analyzed the inherent characteristics of the transmission system based on the centralized parameter method and finite element method, obtained the natural frequency of the transmission system and the vibration mode corresponding to each order frequency, and compared the theoretical and experimental data; in 2014, Guo y and Keller J established the centralized control system of the transmission system
In the parameter model, the factors such as gravity, time-varying stiffness and radial clearance of bearing are taken into account.
Hammami, 2016 Considering the influence of variable load on the system stability of planetary gear transmission, a et al. Established the dynamic model of the system based on the contact theory, and solved the equation by numerical method. The results were compared with the experimental results Compared with the test results, the consistency of the results is verified.