| Gear transmission has many advantages,such as accurate transmission ratio,high efficiency and long service life,etc,it is widely used in all walks of life.With the development of industry level and the improvement of environmental protection consciousness,the requirement for vibration and noise of gear transmission mechanism is higher and higher.Therefore,the static and dynamic contact characteristics analysis,time-varying meshing stiffness analysis,vibration and noise prediction,test research of gear system are carried out,it has important engineering application value for vibration and noise reduction design of gear transmission mechanism.In this paper,seven pairs of gears with same center distance of 120 mm,different modulus of 3 mm,4 mm and 6 mm,different helix angles of 0°,8°,and 12°,same transmission ratio of 1.5 and different number of teeth are the research object,and comparative analysis of simulation and experiment are carried out.The main research work of the paper are as follows:(1)Seven pairs of gear pairs were designed and manufactured with a constant center distance of 120 mm.The finite element model of each gear pairs are established,the static and dynamic contact characteristics of gear pairs under various working conditions with different parameters are studied,the single meshing stiffness of gears and the comprehensive meshing stiffness of gears are calculated.Compared with the calculation results of time-varying meshing stiffness of gear pairs based on energy method,the regularity and amplitude of the two methods are basically the same,and the influence factors of meshing stiffness are analyzed.(2)Considering the static transmission error,gear backlash,meshing stiffness and meshing damping,et al,the vibration differential equations of each gear transmission system are established based on the lumped parameter method.The program is writed in MATLAB software,The vibration displacement,vibration velocity and vibration acceleration of the system are solved by the Runge Kutta.On this foundation,the dynamic transmission error and dynamic meshing force of gear pair are solved.(3)The dynamic response finite element model of gear pair transmission system with different parameters are established,the intrinsic mode of gear transmission system is solved by block Lanczos method,then the vibration response of the system is solved by modal superposition method,the vibration characteristics of each gear system under different working conditions are studied.Vibration test is carried out with the help of multi-purpose transmission friction test bench,according to the comparison of the experiment and simulation results,the accuracy of the vibration prediction method and the change rule under different parameters and working conditions of gear system are verified.(4)The boundary element model of the gear system box surface is established,and the frequency domain response of vibration displacement is applied in SYSNOISE software to obtain the acoustic boundary element model.The surface acoustic pressure and field acoustic pressure of box system under different working conditions are calculated.The noise of gear transmission system is tested on the test bench,and the experimental data are compared with the simulation results,the accuracy of air noise prediction method and change rule under different parameters and working conditions of gear system is verified. |
PDF Full Text Request