Practical Methods to Obtain Free-Field Sound Pressure Levels From Acoustical Measurements Over Ground Surfaces

2020 ◽  
Author(s):  
Keyword(s):  
Sound Pressure ◽  
Free Field ◽  
Sound Pressure Levels ◽  
Field Sound

The Analysis on the Effect of Ground Reflection in the Noise Test of Aircraft Engine

2013 ◽  
Vol 860-863 ◽  
pp. 2256-2260
Author(s):  
Guo Hua Yan ◽  
Shuai Chang ◽  
Yong Lei Zhang
Keyword(s):  
Sound Pressure Level ◽  
Sound Pressure ◽  
Free Field ◽  
Aircraft Engine ◽  
Pressure Level ◽  
Engine Noise ◽  
Certification Procedure ◽  
Noise Test ◽  
The Impact ◽  
Field Sound

The data processing of static engine noise test, especially the elimination of ground reflection to access the free-field sound pressure level, has been defined as one of the basic steps in aircraft noise prediction on the noise certification procedure by ICAO[1,. Based on the importance of the method, this paper will study the impact of the ground reflection effects on the aircraft engine noise experimental, especially made a detailed overview for the calculation method of reflective index.This paper also gives the method of fixing this effect to get the free field sound pressure level, while making experiments to verify the feasibility of this method, so that make the noise analysis and prediction according to the noise certification procedures.

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