"Matlab优化设计凸轮型线，提升内燃机配气系统性能"

he key components of the performance of the gas distribution mechanism. How to design and process a cam with a reasonable profile is the most important issue in the design of the entire gas distribution system. This paper first divides the cam into segments and then uses the maximum speed and maximum acceleration position to design the cam motion law based on high-order equation cam motion law through Matlab software for optimization design. According to the rocker arm ratio, the valve motion law is calculated, and then the cam motion law is reverse-solved by changing the rocker arm ratio. Drawing on the experience of high-order equation cam design, a new method of cam design is proposed, optimizing the valve motion law. The new cam profile is compared with the original cam profile, analyzing the improvements in lift, speed, and acceleration obtained by the new design over the original design, and drawing conclusions about the role of the new design in the gas distribution mechanism and even the entire vehicle. Keywords: cam; high-order equation; rocker arm ratio; optimization design 摘要： 本文介绍了基于Matlab软件的凸轮优化设计方法。配气机构是内燃机中的重要部件，而凸轮是决定配气机构性能的关键部件。如何设计出具有合理型线的凸轮是整个配气系统设计中最为重要的问题。文章首先将凸轮分段设计，然后利用最大速度和最大加速度位置基于高阶方程凸轮运动规律，通过Matlab软件进行凸轮型线的优化设计。根据摇臂比计算气门运动规律，然后通过改变摇臂比对凸轮运动规律进行反求。借鉴高阶方程凸轮设计经验，提出了一种优化气门运动规律的新方法。新设计的凸轮型线与原始凸轮型线进行对比，分析了新设计在升程、速度和加速度方面相较于原设计所获得的改善，从而得出新设计对配气机构乃至整车的作用。 关键词：凸轮；高阶方程；摇臂比；优化设计