基于时频域的汽车变速器试验台动态特性分析及优化

Analysis and Optimization of Dynamic Characteristic of Automobile Transmission Test Bench based on Time Domain and Frequency Domain

动态特性是汽车变速器动态模拟试验台最重要的性能之一。结合CATIA、ADAMS和MATLAB等工具,建立了变速器试验台多体动力学方程及动力学模型;在此基础上,提出了变速器试验台时域动态响应评价指标,以上升时间、稳定时间、超调量等评价指标建立了变速器试验台动态响应多目标优化模型,并进行了仿真分析及优化;同时,建立了变速器试验台频域动态响应模型,并在频域内进行了动态响应分析及优化。结果表明,在优化范围内转动惯量小、刚度大、阻尼比大,有利于系统动态特性;优化后较优化前超调量减小19.1%,上升时间减小5.56%,峰值时间减小17%,稳定时间减小40.7%,较大地提高了系统的动态特性。

The dynamic characteristic is one of the most important performances of the dynamic simulation test bench for automobile transmission. Combining with the CATIA,ADAMS and MATLAB,the multi- body dynamics equation and the dynamics model of the transmission test bed are established. On these foundations,the dynamic response evaluation index of the transmission test bench in the time domain is presented. The dynamic response multi- objective optimization model of the transmission test- bed is established with the evaluation index of rise time,stability time and overshoot,and the simulation analysis and optimization are carried out. Otherwise,the dynamic response model of the transmission test bench is established and the dynamic response is analyzed and optimized in the frequency domain. The results show that the smaller the rotational inertia of the system,the bigger the rigidity and the damping ratio is conducive to the dynamic characteristics of system. Compared with the pre- optimization,the overshoot is reduced by 19. 1%,rise time decreases by5. 56%,peak time decreased by 17%,stable time decreased by 40. 7%,the dynamic characteristic of the system is greatly improved.