丁平

山东理工大学交通与车辆工程学院 

      摘要：内燃机振动的主要类型是整机振动和扭转振动。主动控制则可以通过外界能量主动改变控制系统的某些参数来适应内燃机整机振动的变化,因此能达到更好的减振效果。本文以4135型柴油机为研究对象,建立了内燃机整机振动六自由度的数学模型并进行了动力学分析,明确了整机振动的主要干扰力,由此建立了占主导地位的内燃机整机垂向振动控制系统的数学模型。

    关键词： 内燃机整机振动;;模糊控制;;分析

      Abstract: Finite element analysis is applied to analyze different structures of motorcycle reactive muffler.effects of different length and diameter of the expansion chambers,different extensions of inlet and outlet tubes of a single expansion chamber muffler have been studied.First,the mathematic model of the single expansion chamber muffler has been built,and then the Finite Element Method is applied to solve the Helmholz equation.The results show that extensions of inlet and outlet tubes can improve the disadvantages effectively of the passing frequency of the single expansion chamber mufflers.It also shows that the transmission loss reaches the maximum when the extension of inlet tube is l/2 and the outlet tube is l/4.It provides a foundation for selecting optimal muffler structures and corresponding optimal dimension parameters in a short time without a great deal of muffler machining and experiments test.

       Keywords: Motorcycle;Reactive Muffler;Helmholz Equation;Finite Element Method

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