Noise And Vibration Analysis And Shell Structural Optimization Of Twin-screw Supercharger

Abstract:Dynamic analysis of mechanical system and the simulation of structure noise is an important domain of vibration and noise control research. The problem of twin-screw supercharger noise during the work is very prominent. Vibration and noise will have important effect on the performance of supercharger. This issue, take the0.8L twin-screw supercharger which match the Chery372engine as the research object. Study on the relationship between vibration and noise and the shell structure of twin-screw type supercharger. This issue was helpful for the theoretical of structural dynamic modification and low noise design of supercharger. The main contents of this paper are as follows:1. Firstly, the status of research on the dynamic characteristics of the structure and noise analysis are introduced, the basic theory analysis on the dynamic analysis and noise are summarized, introduced the method of dynamic analysis on the turbocharger rotor system and sound radiation analysis of shell structure.2. The finite element dynamic model of rotor system were established in the ANSYS software. The whole system were analyzed in model using finite element method, And the inherent frequency and inherent vibration figure of the rotor system were obtained. Analysis the influence of bearing stiffness, gear meshing stiffness and rotor length on the inherent frequency of the system.3. The vibration and noise of boundary element model of the supercharger shell were established in the SYSNOISE. The component shell structure acoustic radiation energy contribution to the noise were obtained, and put forward the concrete optimization scheme on the shell. The optimization results show that the measures taken by the noise and vibration control of housing has played a certain role.4. An optimized twin-screw supercharger has produced according to the0.8L engine for automobile engine intake supercharging demand combined with the theory analysis and simulation. Experiments are carried out to study the noise control of the supercharger, the results validate the structure improvement scheme.