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psychoacoustic Study on Contribution of Fan Noise to Engine Noise

Chinese Journal of Mechanical Engineering 2012年第4期25卷 809-815页

作者： ZHANG Junhong LIU Hai BI Fengrong NI Guangjian ZHANG Guichang LIN Jiewei YU Hanzhengnan State Key Laboratory of Engines Tianjin University Tianjin 300072 China

There are more researches on engine fan noise control focusing on reducing fan noise level through optimizing fan structure,and a lot of research achievements have been ***,researches on the effect of fan noise to engine noise quality are *** influences of the effects of fan structure optimization on the engine noise quality are ***,there will be a decline in fan noise level,but the deterioration of engine noise *** at the above problems,in consideration of fan structure design and engine noise quality,an innovative method to analyze the contribution of fan noise to engine noise quality using psychoacoustic theory is *** noises of diesel engine installing different cooling fans are measured by using the acoustic pressure *** experiment results are regarded as analysis *** model of sensory pleasantness is used to analyze the sound quality of a diesel engine with different cooling *** show that after installing 10-blade fan in medium diameter the sensory pleasantness at each test point is increased,and the increase is 13.53% on average,which indicate the improvement of the engine noise *** order to verify the psychoacoustical analysis,the subjective assessment is carried *** test result shows the noise quality of engine installed10-blade fan in medium diameter is most superior.1/3 octave frequency spectrum analysis is used to study the reason of the improvement of engine noise *** is found that after installing proper cooling fan the sound pressure level below 400 Hz are obviously increased,the frequency assignment and spectral envelope are more reasonable and a proper cooling fan can optimize the spectrum structure of the engine *** psychoacoustic study is applied in the contribution of fan noise to engine noise,and the idea of engine sound quality improvement through the structure optimization is proposed.

关键词： sound quality psychoacoustic engine noise fan noise

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