scholarly journals Investigation of absorption coefficient measurement of acoustical materials by boundary element method using particle velocity and sound pressure sensor in free field

2009 ◽  
Vol 30 (6) ◽  
pp. 442-445 ◽  
Author(s):  
Kunikazu Hirosawa ◽  
Hiroshi Nakagawa ◽  
Makoto Kon ◽  
Aki Yamamoto
Keyword(s):  
Boundary Element Method ◽  
Absorption Coefficient ◽  
Boundary Element ◽  
Particle Velocity ◽  
Pressure Sensor ◽  
Sound Pressure ◽  
Free Field ◽  
Coefficient Measurement ◽  
Element Method

scholarly journals Acoustic Improvements of Aircraft Headrests Based on Electrospun Mats Evaluated Through Boundary Element Method

2020 ◽  
Vol 10 (16) ◽  
pp. 5712
Author(s):  
Venanzio Giannella ◽  
Francesco Branda ◽  
Jessica Passaro ◽  
Giuseppe Petrone ◽  
Mattia Barbarino ◽  
...  
Keyword(s):  
Boundary Element Method ◽  
Boundary Element ◽  
Sound Pressure ◽  
Pressure Level ◽  
Cabin Noise ◽  
Acoustic Load ◽  
Acoustic Comfort ◽  
Passive Noise ◽  
The Impact ◽  
Element Method

This work illustrates the development of passive noise control (PNC) improvements of aircraft headrests to enhance the acoustic comfort for passengers. Two PNC improvements were studied with the aim of reducing the noise perceived by passengers during flight. Two headrest configurations, with and without the lateral caps, and two different materials, a traditional foam and an innovative Silica/Polyvinylpyrrolidone (PVP) woven non-woven mat, were considered, and compared in terms of sound pressure level (SPL) perceived by passengers. Boundary element method (BEM) models were built up to evaluate the acoustic performances of different headrest configurations, varying in terms of shape and textile. A spherical distribution of monopole sources surrounding the headrests was considered as acoustic load, in such a way as to recreate a diffuse acoustic field simulating the cabin noise perceived by passengers during cruise conditions. The impact of the two PNC improvements was analyzed to envisage some general guidelines useful to design advanced headrests from the acoustic viewpoint.

Prediction of sound pressure in the far field using the inverse boundary element method

2010 ◽  
Vol 58 (1) ◽  
pp. 74 ◽  
Author(s):  
D. W. Herrin ◽  
J. Liu ◽  
F. Martinus ◽  
D. J. Kato ◽  
S. Cheah
Keyword(s):  
Boundary Element Method ◽  
Boundary Element ◽  
Sound Pressure ◽  
Far Field ◽  
Inverse Boundary ◽  
Element Method
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