Design and experiment of phononic crystal for vibration and noise control of automotive compressor
In order to solve the problem that it is difficult to control the low frequency vibration and noise of the automobile compressor,a phononic crystal structure is designed in the compressor housing based on the local resonance mechanism.With the aid of finite element method,the band gap range of phononic crystal is calculated,the reasons for selecting the structural parameters of phononic crystal and their arrangement in the compressor housing are clarified,and the advantages of the designed phononic crystal are analyzed.Then,each part of the material is customized to assemble the phononic crystal entity and arranged on the rear end face of the compressor housing.A compressor vibration and noise bench is built.Four acoustic field points are selected to collect the radiated noise,and the vibration changes of the compressor body are recorded.Furthermore,a certain type of automobile is selected to build the whole vehicle vibration and noise test-bed of the compressor,and an acoustic microphone is set up on the right side of the driver's seat near the human ear to collect the radiated noise in the driving room,and the vibration changes of the compressor body are recorded.The test results show that,after installing phononic crystals in the compressor housing,the total radiated noise and root mean square values of the compressor body vibration acceleration measured in the bench test and the vehicle test are basically improved within the corresponding speed range of the phononic crystal band gap frequency,and the effect is significant in some speed ranges.This paper provides a new reference for the research of low frequency vibration and noise control of automobile compressor.
Automobile compressorPhononic crystalBench testVehicle testVibration and noise control
万方数据
维普
