Abstract
To solve the common rattle and whine issues in high-speed BEV reducer, this article aims to calculate and analyze the NVH performance of the reducer by using MASTA. By optimizing gear macro geometry and micro geometry to reduce the transmission error of gear pair which plays a decisive role in the common rattle and whine. By using MASTA, import the macro and micro geometry parameters of the gear pairs of the reducer. And using ABAQUS/CAE to preprocessing reducer housing, differential housing etc. and import them to MASTA. And then, assembly those components together to simulate the reducer as precise as possible. The system stiffness matrix and mass matrix are calculated which is strongly concerned to the NVH performance of the reducer. This article analyzed the assembly vibration model by calculating the assembly stiffness matrix and mass matrix and optimized the gear pairs’ parameters to reduce the transmission error of the gear pairs. And compared the optimized reducer with the original reduce in the same conditions, to make sure that the optimization is work. And so get the experience to control the NVH performance from the research. And according to these experiences, instruct engineers to design reducers that meet the harshness requirements of NVH to optimize the performance of speed reducer assembly.
Highlights
With the development of China's economy, car ownership continues to go high
After entering modification of parameters, through MASTA simulation, the input torque of 240 Nm transmission errors are shown in Figure 9 and Figure 10, and Campbell diagrams are shown in Figure and Figure
And figure 14, we can see that the transmission error peak of the low-speed gear pair reduced from 1.9564um to 0.9897um, and the relative dynamic mesh force peak show in figure. 12 and figure. 16 reduced from 0.359 kN to 0.142 kN
Summary
With the development of China's economy, car ownership continues to go high. Vigorously develop electric vehicles, can speed up the alternative fuel, reduce vehicle emissions, to energy security, promote energy conservation and emissions reduction, prevention and control of atmospheric pollution. Compared with the developed countries, there is no consensus on the development of BEV or hybrid electric vehicle technology routes. China is weak in the aspect of design development, key parts and components manufacturing is relatively un-advanced, especially in the areas such as the key technology of BEV’s NVH ability (noise, vibration and harshness), will become a big obstacle of the industrialization of new energy vehicles. In the study of transmission NVH performance, as early as 1967, K.Nakamura [1] studied the nonlinear dynamics of gear system gap. In 2014, Wang Liansheng [4] studied the nonlinear dynamics and NVH performance of the coupling system of engine and transmission. In 2017, Pan Xiaodong [6] studied BEV high-speed gear train NVH performance. Liu Xianghuan et al.: High-speed BEV Reducer NVH Performance Optimization and Experimentation
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