104 Technique of aerodynamic noise reduction by porous material : 2nd report: Experimental results of wake velocities and characteristics of sound absorption(2)

2007 ◽  
Vol 2007 (0) ◽  
pp. _104-1_-_104-4_
Author(s):  
Takehisa TAKAISHI ◽  
Takeyuki SUEKI ◽  
Mitsuru IKEDA
Keyword(s):  
Porous Material ◽  
Noise Reduction ◽  
Sound Absorption ◽  
Experimental Results ◽  
Aerodynamic Noise

1310 Technique of aerodynamic noise reduction by porous material

2007 ◽  
Vol 2007.82 (0) ◽  
pp. _13-10_
Author(s):  
Takeshi SUEKI ◽  
Takehisa TAKAISHI ◽  
Mitsuru IKEDA
Keyword(s):  
Porous Material ◽  
Noise Reduction ◽  
Aerodynamic Noise

scholarly journals Sound absorption of a micro-perforated plate backed by a porous material under high sound excitation: measurement and prediction

2013 ◽  
Vol 2 (4) ◽  
pp. 281 ◽  
Author(s):  
Rostand Boumda Tayong ◽  
Thomas Dupont ◽  
Philippe Leclaire
Keyword(s):  
Porous Material ◽  
Sound Absorption ◽  
Perforated Plate ◽  
Rigid Wall ◽  
Experimental Results ◽  
Mean Flow ◽  
Sound Levels ◽  
Specific Impedance ◽  
Air Flow Resistivity ◽  
High Sound

The sound absorption coefficient of perforated facings backed by porous materials is studied under high sound intensities in the absence of mean flow. The theoretical considerations are based on the equivalent fluid following the Johnson-Champoux-Allard approach and the use of the transfer matrix method. To take into account the high sound levels effects, the air flow resistivity of each layer is modified following the Forchheimer law. Two specimens of perforated plate are built and tested when backed by a polymeric foam and a fibrous material. A specific impedance tube setup is developed for the measurement of the surface acoustic impedance for sound pressure levels ranging from 90 dB to 150 dB at the surface of the perforated facing. To corroborate the validity of the presented method, two considerations are particularly depicted in the experimental results: first, the case where the perforated facing and the porous material are both directly backed by a rigid wall and the case where there is an air cavity between the porous material and the rigid wall. Good agreement is observed between the simulation and the experimental results.

A study about applying condition of porous material to pantograph head support considering bidirectional aerodynamic noise reduction

2019 ◽  
Vol 2019.29 (0) ◽  
pp. J105
Author(s):  
Takeshi MITSUMOJI ◽  
Kyohei NAGAO ◽  
Shigeyuki KOBAYASHI ◽  
Hiromasa HIRAKAWA ◽  
Takayuki USUDA ◽  
...  
Keyword(s):  
Porous Material ◽  
Noise Reduction ◽  
Aerodynamic Noise

0705 An Experimental Investigation on Aerodynamic Noise Reduction Using Porous Material

2009 ◽  
Vol 2009 (0) ◽  
pp. 277-278
Author(s):  
Takeshi SUEKI ◽  
Takehisa TAKAISHI ◽  
Masahiro SUZUKI ◽  
Norio ARAI
Keyword(s):  
Experimental Investigation ◽  
Porous Material ◽  
Noise Reduction ◽  
Aerodynamic Noise

scholarly journals Aerodynamic Noise Reduction in Pantographs by Shape-smoothing of the Panhead and Its Support and by Use of Porous Material in Surface Coverings

2010 ◽  
Vol 51 (4) ◽  
pp. 220-226 ◽  
Author(s):  
Mitsuru IKEDA ◽  
Takeshi MITSUMOJI ◽  
Takeshi SUEKI ◽  
Takehisa TAKAISHI
Keyword(s):  
Porous Material ◽  
Noise Reduction ◽  
Aerodynamic Noise
Sign in / Sign up

Export Citation Format

Share Document