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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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A model-scale test on noise from single-stream nozzle exhaust geometries in static conditions

引用

Chinese Journal of Aeronautics 2018年第12期31卷 2206-2220页

作者： Incheol LEE Yingzhe ZHANG Dakai LIN Beijing Aeronautical Science and Technology Research Institute of Commercial Aircraft Corporation of China Ltd. Beijing Key Laboratory of Simulation Technology for Civil Aircraft Design

A model-scale test with single-stream nozzle exhaust geometries was carried out at the anechoic chamber of Beihang University in Beijing, China. The spectral characteristics are investigated, and the effects of the following parametric variations are reported in this paper: impact of nozzle operating conditions on spectra; impact of the presence of a plug; and effectiveness of chevron configurations for noise mitigation. The measurement shows that the change of pressure values has more impact on spectra than the change of temperature values. The spectral change due to pressure is shown at all band numbers for unheated conditions whereas it is more pronounced at highfrequency ranges for heated conditions. An impact of the presence of a plug is also clearly *** reduction of noise is moderate up to band number of 35, and becomes more significant at higher band numbers. It is observed that chevron nozzles are more efficient at high pressure and temperature values. It is expected that the quantified analysis will be used to develop an empirical model of single jet noise, which will be the baseline for the development of prediction of noise from turbofan engines of high bypass ratios.

关键词： Chevron engine noise engine plug Jet noise Single-stream jet

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