An Apparatus for Measuring the Velocity of Sound and Acoustic Absorption Coefficients

1948 ◽  
Vol 16 (4) ◽  
pp. 231-233 ◽  
Author(s):  
Arthur Waltner
Keyword(s):  
Acoustic Absorption ◽  
Velocity Of Sound ◽  
Absorption Coefficients

Acoustic Absorption Coefficients of the Surface of Laboratory Animals

1958 ◽  
Vol 30 (12) ◽  
pp. 1105-1111
Author(s):  
Eugene Ackerman ◽  
Robert W. Farwell ◽  
Fujio Oda ◽  
Adam Anthony
Keyword(s):  
Laboratory Animals ◽  
Acoustic Absorption ◽  
Absorption Coefficients

Acoustic absorption coefficients of combustion gases

AIAA Journal ◽  
1964 ◽  
Vol 2 (2) ◽  
pp. 392-393 ◽  
Author(s):  
D. W. BLAIR ◽  
E. ERIKSEN ◽  
G. K. BERGE
Keyword(s):  
Acoustic Absorption ◽  
Absorption Coefficients ◽  
Combustion Gases

scholarly journals The Use of Fabrics to Improve the Acoustic Absorption: Influence of the Woven Fabric Thread Density Over a Nonwoven

2018 ◽  
Vol 18 (3) ◽  
pp. 269-280 ◽  
Author(s):  
Pilar Segura-Alcaraz ◽  
Jorge Segura-Alcaraz ◽  
Ignacio Montava ◽  
Marilés Bonet-Aracil
Keyword(s):  
Sound Absorption ◽  
Woven Fabric ◽  
Acoustic Absorption ◽  
Human Beings ◽  
Absorption Coefficients ◽  
Acoustic Characteristics ◽  
Resistive Layer ◽  
Acoustic Absorption Coefficient ◽  
Impedance Tube Method

Abstract Noise is frequently unnoticed, but it is one of the causes of unhealth for human beings reducing people’s quality of life. There are many materials that can be considered as acoustic absorbents. Textiles can be used to both improve the acoustic quality of and to decorate the room where they have been placed. In this study, we used some fabrics with 15, 20 and 30 ends/cm and 15, 20 and 30 picks/cm. The acoustic absorption coefficient was measured when the fabric was added as a resistive layer on top of a nonwoven made of polyester fiber. Results evidence that these fabrics can be efficiently used to modify the acoustic absorption of the nonwoven. Sound absorption coefficients measured via the impedance tube method show that these modifications occur. The results show how it is possible to improve the acoustic characteristics of a simple nonwoven to obtain sound absorption coefficients close to values of 1 at different frequencies by choosing a fabric with the appropriate combination of warp and weft count.

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