Abstract
Due to the tightening demands concerning the
environmental noise, knowledge of the sound generation of
internal combustion engines (IC-engines) 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 large power plant or marine IC-engine, the duct
diameters are large and therefore the acoustic source
characteristics in the high frequency non-plane 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.
Original language | English |
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Title of host publication | 27th CIMAC World Congress on Combustion Engine |
Number of pages | 8 |
Publication status | Published - 2013 |
MoE publication type | D3 Professional conference proceedings |
Event | 27th CIMAC World Congress on Combustion Engine Technology - Shanghai, China Duration: 13 May 2013 → 16 May 2013 |
Conference
Conference | 27th CIMAC World Congress on Combustion Engine Technology |
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Abbreviated title | CIMAC 2013 |
Country/Territory | China |
City | Shanghai |
Period | 13/05/13 → 16/05/13 |
Keywords
- acoustic source characteristics
- medium speed IC-engine
- exhaust system