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Analysis of Interior Noise in Low-frequency Range of EV Car

ZHU Mao-tao; FAN Ting; WANG Zhong; LIU yi-fu

2012, 32 (4): 96-102. DOI: 10.3969/j.issn.1006-1355.2012.04.022

Abstract （2003）

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In view of the lower frequency problem of a micro-EV, using the finite element method (FEM), the acoustic modal was calculated ,then the acoustic frequency response of the cab was made . In order to reduce the vibration of the panel which radiates the noise most, BEM was used to calculate the acoustic contribution of the main panel of the car body, then to solve it by putting up damping material on the panel. By comparing the noise response, it is found that the damping material has significantly reduced the noise of the cab.

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Analysis of Vibro-acoustic Coupling Sound Field and Structure Vibration and Noise Isolation

FEI Chao-yang;CHEN Chang-zheng;ZHOU Bo;WANG Zhong

2012, 32 (2): 54-58. DOI: 103969/j.issn.1006-1355-2012.02.013

Abstract （1736）

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Taking measured loads spectrum generated by blower unit pipeline as excitation source, the room sound field and its vibro-acoustic coupling condition at different frequency are simulated using ANSYS and Virtual Lab sound field simulating software. Simulation results show that vibro-acoustic coupling could be negligible below 400Hz, but the strong vibro-acoustic coupling is existed above 400Hz. The simulation results are consistent with actual measuring results. Through analyzing frequency bandwidth characteristics of loads spectrum and noise spectrum, the double-layer vibration isolation system with general damping vibration isolator and small middle mass is established and its vibration transmission coefficient is calculated. Vibration insulation and noise reduction effects are satisfactory.