基于频率响应分析的发动机主倾角优化计算

Optimization Calculation on the Main Inclination of Engine Based on Frequency Response Analysis

应用有限元分析理论,建立了某款摩托车的频率响应分析模型,模拟了车架结构在发动机激励下的振动响应特性。在此基础上,以发动机的主倾角为设计变量、对骑乘舒适性影响比较大的几个关重点的振动加速度几何加权均方根值为目标函数,进行了结构优化计算,寻找最优的发动机一阶往复惯性力方向,以降低整车的振动从而提高乘坐舒适性,并为产品的研发提高理论参考依据。

Using the finite element analysis theory, the model of the frequency response of a motorcycle is established, and the vibration response characteristic of the frame structure excited by the engine is simulated. On this basis, with the engine＇s main angle of inclination as the design variable, the structure optimization calculation will be conducted with the vibration acceleration weighted geometric roots of key factors influencing the comfortability of the riding motorcycle as the objective function, with the aim of finding the optimal engine first order reciprocating inertial force direction to reduce the vibration of motorcycle so as to improve the ride comfortability and the theoretical basis for research and development of products.