All mechanical motions are accompanied by the loss of mechanical energy, that is, all vibrations have damping. The damping force exists on the surface of the moving rigid body. Using simulationx software, considering the time-varying meshing stiffness, the influence on the dynamic characteristics of planetary gear transmission system when the meshing damping is C = 10ns / m, C = 20ns / M and C = 30ns / m.
By observing the simulation results, with different meshing damping, it is found that the change trend of the spectrum of the normal force of each pair of gears in the composite planetary gear mechanism is the same as that of each pair of gears in the parallel shaft gear mechanism. Here, the planetary gears in the composite planetary gear mechanism are selected for specific analysis, as shown in the figure.
With the change of meshing damping C, the natural frequency of the planetary gear does not change, but the maximum amplitude caused by it decreases. In the spectrum diagram of the planetary gear, when C = 10ns / m, the maximum amplitude is 1600n, when C = 20ns / m, the maximum amplitude is 1400N, and when C = 30ns / m, the maximum amplitude is 1400N. Similar results are obtained in the spectrum diagram of parallel shaft gear, which will not be described here.
This shows that the existence of meshing damping can absorb the vibration energy of the system and play a positive role in vibration reduction. The larger the meshing damping, the smaller the amplitude, but if the meshing damping is too large, it will increase the fuel consumption of the vehicle. Therefore, selecting the appropriate meshing damping plays a positive role in the study of the vibration characteristics of the planetary gear transmission system of hybrid electric vehicle.