Reciprocating internal combustion engines. Measurement method for air cleaners. Sound power level of combustion air inlet noise and insertion loss using sound pressure

2015 ◽  
Keyword(s):  
Insertion Loss ◽  
Measurement Method ◽  
Internal Combustion Engines ◽  
Sound Pressure ◽  
Power Level ◽  
Sound Power ◽  
Combustion Engines ◽  
Air Inlet ◽  
Sound Power Level ◽  
Air Cleaners

scholarly journals The Research of Acoustic Emission of a Low-Power Aircraft Engine

2018 ◽  
Vol 2018 (3) ◽  
pp. 14-25
Author(s):  
Michał Gęca ◽  
Konrad Pietrykowski ◽  
Karol Rosiński
Keyword(s):  
Sound Pressure ◽  
Power Level ◽  
Aircraft Engine ◽  
Sound Level ◽  
Sound Power ◽  
Research Model ◽  
Confined Space ◽  
Sound Power Level ◽  
Model Aircraft ◽  
Level Meter

Abstract This paper presents the methodology and investigation of the sound power level produced by a radial piston aircraft engine operating at varied speeds. The research model aircraft engine of a maximum power of 5.5 kW with a two-bladed airscrew was placed on a test bend. Its sound power level was calculated from the sound pressure level measured at 9 measurement points distributed on a hemispherical surface in a confined space in line with PN-EN 3744. Mean sound power generated by the ASP FS400AR engine is 96 dB at idle (2,880 rpm) and 105 dB at a cruising speed (4,740 rpm). Accordingly, it can be concluded that a sound level meter registered a higher sound power level at the points in front of the model aircraft engine than at the points behind it, whereas the lowest sound power level was registered directly above the engine.

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