【作者】

Antti Hynninen,Mats Abom

【摘要】

论文已在中国上海举行的第27届CIMAC大会上发表。论文的版权归CIMAC所有。Due to the tightening demands concerning the environmental noise, knowledge of the sound generation of internal combustion engines(ICengines) is of great importance. The exhaust noise of an IC-engine travels from the source via transmission path, exhaust system, to the outside environment.When designing the elements used in IC-engine exhaust systems,e.g, silencers or catalytic convertersto reduce the exhaust emissions, including noise, the acoustic source characteristics of the IC-engine must be known. The studied audio frequency range can be divided into the low frequency plane wave range and high frequency non-plane wave range. The low frequency plane wave range acoustic source characteristics of an IC-engine can be determined accurately by using for example process simulation software and acoustic multi-load methods. If the diameter of the studied duct is small as in automotive systems, the low frequency plane wave range source characterization might be enough. When studying noise froma medium speed power plant or marine IC-engine, the duct diameters are large and therefore the acous-tic source characteristics in the high frequency nonplane wave range are also important. The goal of this study is to estimate how the acoustic source data of a medium speed IC-engine exhaust system can be determined in the low frequency plane wave range and also in the high frequency non-plane wave range using engineering practices and acoustic power based methods. In this study the source characteristics are determined based on simulations and measurements, then the low-and high frequency source characteristics are combined in a way that alows them to be used in multi-port simulations.

【会议名称】

第27届CIMAC会议

【会议地点】

上海

【下载次数】

1

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