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| Control and path analysis of airborne noise of fuel cell vehicle |
| National Engineering Laboratory of New Energy Vehicles and Power Systems, Tongji University, Shanghai 201804, China) |
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Abstract The transfer path analysis and measurement methods of airborne noise were discussed to the noise problems of middle and high frequency of fuel cell vehicle(FCV). The detection and synthesis methods of airborne noise for FCV were proposed.The correction coefficient of airborne noise synthesis was discussed in detail, and the calculation formula was deduced and programmed. To analysis airborne noise transfer path, the acoustic reciprocity method was used to deduce acoustic transfer functions. Based on the correlation between different sources and receivers, the correction coefficient was introduced to synthesize airborne noise. The effect of correction coefficient on synthesized results was compared with that regardless of correction coefficient. Combined nearfield sound signal of noise sources with the acoustic transfer functions, the total airborne noise was obtained. Contribution analysis of airborne noise illuminates that the top of auxiliary power unit of fuel cell is main airborne path. To reduce the airborne noise level, the main path noise radiation was controlled by sound isolation and sound absorption. The results show that the amplitude of middle and high frequency of interior noise are reduced apparently. The transfer path analysis method of airborne noise is proved to be reasonable.
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2011, Vol. 32 
