基于matlab的凸輪優(yōu)化設計

摘    要
配氣機構是內燃機的重要組成部分，配氣凸輪是決定配氣機構工作性能的關鍵零件，如何設計和加工出具有合理型線的凸輪是整個配氣系統(tǒng)設計中最為重要的問題。
文章首先對凸輪進行分段設計，然后利用最大速度和最大加速度位置基于高次方程凸輪運動規(guī)律設計通過Matlab軟件進行凸輪型線的優(yōu)化設計，根據搖臂比計算氣門運動規(guī)律，然后通過變搖臂比對凸輪運動規(guī)律進行反求，借鑒高次方程的凸輪設計經驗，得出一種凸輪設計的新方法，對氣門運動規(guī)律進行優(yōu)化設計，將新設計凸輪型線與原始凸輪型線進行對比，分析出新設計比原設計上在升程、速度和加速度方面所得到的提高，據此得出新設計對配氣機構乃至整車所發(fā)揮的作用。

關鍵詞：凸輪；高次方程；變搖臂比；優(yōu)化設計

 
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    錄
1緒論 1
1.1配氣凸輪結構形式及特點 1
1.1.1等加速凸輪 1
1.1.2組合多項式型 2
1.1.3高次方凸輪 2
1.1.4多項動力凸輪 2
1.2配氣機構動力特性計算模型 3
1.2.1單質盆模型 3
1.2.2二質量模型 3
1.2.3多自由度模型 3
1.2.4有限元模型 3
1.3配氣凸輪型線設計國內外研究現(xiàn)狀 4
1.4配氣凸輪優(yōu)化設計方法 5
1.4.1靜態(tài)優(yōu)化設計 6
1.4.2動態(tài)優(yōu)化設計 6
1.5凸輪優(yōu)化設計總結 7
1.6課題研究主要內容 8
2基于高次方程凸輪型線設計 9
2.1普通高次多項式凸輪型線的設計 9
2.1.1緩沖曲線的設計 10
2.1.2工作段運動曲線設計 12
2.2高次多項式凸輪的新型設計方法 14
2.3汽油發(fā)動機凸輪型線的改進設計 15
2.3.1汽油機配氣凸輪型線設計的原則 15
2.3.2發(fā)動機進氣凸輪的改進設計 16
2.3.3改進凸輪型線設計的MATLAB實現(xiàn) 17
2.4本章小結 19
3基于高次方程的氣門理想運動規(guī)律計算 20
3.1氣門設計理論基礎 20
3.2氣門運動規(guī)律要素 20
3.2.1氣門有準確的配氣相位 20
3.2.2良好的充氣性能 20
3.2.3工作平穩(wěn) 20
3.3氣門運動規(guī)律的設計 21
3.4本章小結 21
4利用變搖臂比反求凸輪型線 22
4.1計算變搖臂比 22
4.1.1搖臂的運動學分析 22
4.1.2搖臂比的計算 23
4.2確定凸輪的升程函數 24
4.3分析原設計與變搖臂比設計 24
4.4本章小結 26
5總結與展望 28
5.1總結 28
5.2展望 28
參考文獻 30
致    謝 32