基于matlab的凸轮优化设计.doc

毕 业 设 计 论 文 摘 要 配气机构是内燃机的重要组成部分，配气凸轮是决定配气机构工作性能的关键零件，如何设计和加工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。 文章首先对凸轮进行分段设计，然后利用最大速度和最大加速度位置基于高次方程凸轮运动规律设计通过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，然后通过变摇臂比对凸轮运动规律进行反求，借鉴高次方程的凸轮设计经验，得出一种凸轮设计的新方法，对气门运动规律进行优化设计，将新设计凸轮型线与原始凸轮型线进行对比，分析出新设计比原设计上在升程、速度和加速度方面所得到的提高，据此得出新设计对配气机构乃至整车所发挥的作用。 关键词：凸轮；高次方程；变摇臂比；优化设计 ABSTRACT It is the importance of the internal combustion engine to constitute part to go together with to annoy organization, go together with to annoy a cam is to decide to go together with the key spare parts of annoying the organization work function, how design and process to submit the cam of having the reasonable type line is the most important problem in the whole design that go together with to annoy system. The article carries on a cent to the cam first segment design, then make use of the biggest speed and the biggest acceleration position exercises according to Gao power distance cam the regulation design carry on a cam type through a Matlab software line of excellent turn a design, according to shaking an arm ratio to compute air valve sport regulation, then pass and change and shake arm compare exercise to the cam the regulation carry on anti- beg, draw lessons from Gao power distance of cam design experience, get a kind of cam design of new method, to air valve sport the regulation carry on excellent turn a design, will lately design a cam type the line and original cam type line carry on contrast and analyze lately design ratio original design up gain in the aspects of rising distance, speed and acceleration of exaltation, on these grounds get a new design to go together with to annoy organization is to the whole car develop of function. Key words: cam; high index number equality; proportion of changing; optimization design 目 录 1绪论 1 1.1配气凸轮结构形式及特点 1 1.1.1等加速凸轮 1 1.1.2组合多项式型 2 1.1.3高次方凸轮 2 1.1.4多项动力凸轮 2 1.2配气机构动力特性计算模型 3 1.2.1单质盆模型 3 1.2.2二质量模型 3 1.2.3多自由度模型 3 1.2.4有限元模型 3 1.3配气凸轮型线设计国内外研究现状 4 1.4配气凸轮优化设计方法 5 1.4.1静态优化设计 6