文档介绍：Research on Dynamic Characteristics Analysis of Valve Group of Diesel Engine
Abstract
Valve train is an important part of the engine, its function is to achieve the ventilation process of the valve train. According to the requirements of the work cycle in the cylinder and the ignition sequence, timed to open and close the intake and exhaust valves of each cylinder to ensure cylinder to inhale fresh air and bustion exhaust gas timely. When desiging the valve train of diesel engine, the normally reliable work of the valve train must be guaranteed, so it is necessary and important to research the dynamic characteristics of the valve train.
In this paper, the valve train of certain diesel engine was taken as research subjects, its dynamics was analyzed specifically. Firstly, according to the dynamics theory of the valve train, the single-degree-of-freedom dynamic model and the multi-degree-of-freedom dynamic model of the valve train were established, and then use formulas to estimate the parameters in the models, at last, MATLAB software was used to fit the cam profile data to gain the law of motion of the cam follower of the original data.
At the same time AVL software was also utilized for valve train dynamics analysis in this paper, Excite Timing Drive module was used to establish the dynamic model of the valve train, introduced the method of finite element analysis to determine the parameters of the models, obtained the dynamics of the valve ponents and then evaluated the results. Then research the impact of the engine speed, valve clearance, valve spring stiffness parameters on the dynamics of the valve train to find the main factor to cause the flutter of valve spring.
Finally, the flutter of valve spring was theoretical analyzed in this paper, and optimized design was proposed, besides, the valve spring was redesigned. The simulation results show that the flutter of the valve spring was inhibited to some extent with the new design of the
valve spring.
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