内燃机配气凸轮机构型线的动力学优化设计

Optimized Dynamics Design of Distribution Cam Mechanism in Internal Combution Engine

为减少内燃机配气机构的冲击振动 ,提高其动力性和经济性 ,用优化设计方法将配气机构简化为单质量振动系统 ,建立其动力学优化设计的数学模型 .以复合摆线 型凸轮为例 ,进行动力学优化设计 .结果表明 :优化方案和原方案相比 ,丰满系数提高了 1.2 5 % ,动态最大正加速度在上升段下降 1% ,但在下降段上升了 5 % ,动态最大负加速度下降 6.4% ,系统动态速度及动态加速度振幅比未优化方案要小 。

To decrease the internal combustion's vibration and shock and improve its dynamic and economic property,the distribution mechanism in it is,with the application of the optimized design,simplified as a single mass vibrating system so as to establish its mathematics model.Taking the complex cycloid cam as an example,the calculations show:compared with traditional plan the optimized design improves the plentiful coefficient by 1.25% and lowers the maximum positive acceleration by 1% in rising phase,while increasing it by 5% in descending phase.As far as maximum negative acceleration is concerned,it has a decline of 6.4%.The amplitude of the system's velocity and acceleration is much less than that of in traditional plan and in addition the variance tends to be stable.