Acoustic source characterization of medium speed ic-engine exhaust system
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 converters to 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 from a medium speed power plant or marine IC-engine, the duct diameters are large and therefore the acoustic 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 allows them to be used in multi-port simulations.
Antti Hynninen Mats Abom Hans Boden Esa Nousiainen Matias Aura
VTT Technical Research Centre of Finland,Finland KTH Competence Centre for Gas Exchange,Sweden KTH Linne Flow Centre,Sweden W(a)rtsil(a) Finland Oy Power Plants,Finland W(a)rtsil(a) Finland Oy Industrial Operations,Finland
国际会议
上海
英文
1-8
2013-05-13（万方平台首次上网日期，不代表论文的发表时间）