Vibration And Noise Reduction And Lightweight Research Of Two-stage Planetary Gearbox Based On Response Surface Method

The noise and vibration performance of large planetary gearbox is not only an important indicator to measure the overall performance of gearbox drive system, but also an important manifestation of the product market competitiveness. In order to improve the market competitiveness, the requirements of low noise and lightweight are put forward in the market for the large multi-stage planetary gear system. The performance of the existing planetary gear system is far from these goals, and the key to achieve these goals is to advance the performance of the planetary gear box.This paper with the support of the National Science and Technology Support Program(item number: 2013BAF01B05), taking a large mine hoist two-stage planetary gearbox as the research object and on basis of the study of two-stage planetary gear dynamic characteristics, carries out a study on vibration response analysis, radiated noise analysis, panel contribution analysis and vibration and noise reduction research based on response surface methodology by means of the finite element method and the boundary element method. The structure optimization design of large two-stage planetary gearbox is completed and finally the goals of the radiated noise reduction and lightweight are reached.The main contents of this paper are as follows:① This paper establishes the nonlinear transient dynamic analysis model of a two-stage planetary gearbox and then finishes the gearbox dynamics simulation by using dynamic explicit algorithm so that it is available to get the excitations acting on box body during the running of the gearbox.② The modal superposition method is applied to analyze vibration response of the gearbox and the output results return the vibration speed response of the box body to provide the boundary conditions for the acoustic analysis.③ Based on the above results of vibration response, the acoustic simulation on the gearbox casing is conducted to predict the radiated noise and identify the peak sound pressure. After then the panel acoustic contribution analysis of this gearbox is conducted based on the contributions theory, and the main contribution panels are determined. Finally those panels provide a basis for structure optimization design.④ Through uniform design experiment with taking the main contribution panels as experimental factors and taking the radiated noise and the mass of the box body as the experimental indicators, this paper obtains the response surface approximation models of the radiated noise and the mass. Then a multi-objective mathematical optimization model is constructed based on those models. Finally the genetic algorithm is applied to optimize the mathematical model to obtain an optimized scheme of the box structure.⑤ According to the optimized scheme, the gearbox structure is improved to verify the effect of the response surface method optimization. The result shows that the goals of radiated noise reduction and lightweight of the gearbox are realized in a certain degree with response surface method application.