THE EFFECT OF FOAM THICKNESS, SOUND INTENSITY, AND AIR LAYER ON SOUND ABSORPTION COEFFICIENT OF POLYURETHANE FOAM USING TRANSFER FUNCTION METHOD

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FOROUHARMAJD FARHAD; MOHAMMADI ZAHRA; SALEHIAN JAFAR; MOSAYEBI MASOUD

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Journal: Journal of Health System Research Year:2016 | Volume:13 | Issue:2 Page(s): 0-0

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Title

THE EFFECT OF FOAM THICKNESS, SOUND INTENSITY, AND AIR LAYER ON SOUND ABSORPTION COEFFICIENT OF POLYURETHANE FOAM USING TRANSFER FUNCTION METHOD

Author(s)

FOROUHARMAJD FARHAD | MOHAMMADI ZAHRA | SALEHIAN JAFAR | MOSAYEBI MASOUD | Issue Writer Certificate

Keywords

SOUND ABSORPTION COEFFICIENT

TRANSFER FUNCTION

POLYURETHANE FOAM

SOUND INTENSITY

AIR LAYER

Abstract

Background: POLYURETHANE FOAM is a sound-absorbing material. The affective factors of its sound absorption have not received much attention in Iran. Therefore, the present study was conducted with aim to investigate the effect of sample thickness, air gap thickness, and SOUND INTENSITY on sound absorption rate of open cell POLYURETHANE FOAM.Methods: To conduct this experiment, the impedance tube was built based on the standards and the absorption coefficient of open cell POLYURETHANE FOAM with thicknesses of 25 and 50 mm was measured. Then, both foam thicknesses were evaluated in six different sound intensities of 70, 80, 90, 100, 110, and 120 dB. Furthermore, the absorption coefficient of the 25 mm thick foam with 5.5 cm of air and the 50 mm thick foam with 3 cm AIR LAYER at end of samples were measured. Then, the absorption coefficient of 40 mm thick foam was measured with 1 cm AIR LAYER and 2 cm of foam on either side, and then, 1 cm air leyer and 4 cm of foam on either side. Findings: The accuracy and efficiency results showed that the impedance tube can be used with a correlation coefficient of 0.98. The effect of SOUND INTENSITY on sound absorption was not significant in either of the two thicknesses of POLYURETHANE FOAM. The AIR LAYER at the end of the 25 and 50 mm thick foam increased the absorption in average and high frequency ranges. The absorption coefficient of 40 mm thick foam with 1 cm of air in the middle increased in all frequencies, and of the sample with 1 cm air at the end increased in high frequencies, compared to the 5 cm thick foam without AIR LAYER.Conclusion: According to the results of this study, the SOUND ABSORPTION COEFFICIENT of the open cell POLYURETHANE FOAM can be improved with a higher thickness and by inserting a layer of air at the end or in the middle of the absorbent material.

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APA: Copy

FOROUHARMAJD, FARHAD, MOHAMMADI, ZAHRA, SALEHIAN, JAFAR, & MOSAYEBI, MASOUD. (2016). THE EFFECT OF FOAM THICKNESS, SOUND INTENSITY, AND AIR LAYER ON SOUND ABSORPTION COEFFICIENT OF POLYURETHANE FOAM USING TRANSFER FUNCTION METHOD. HEALTH SYSTEM RESEARCH, 13(2), 0-0. SID. https://sid.ir/paper/694882/en

Vancouver: Copy

FOROUHARMAJD FARHAD, MOHAMMADI ZAHRA, SALEHIAN JAFAR, MOSAYEBI MASOUD. THE EFFECT OF FOAM THICKNESS, SOUND INTENSITY, AND AIR LAYER ON SOUND ABSORPTION COEFFICIENT OF POLYURETHANE FOAM USING TRANSFER FUNCTION METHOD. HEALTH SYSTEM RESEARCH[Internet]. 2016;13(2):0-0. Available from: https://sid.ir/paper/694882/en

IEEE: Copy

FARHAD FOROUHARMAJD, ZAHRA MOHAMMADI, JAFAR SALEHIAN, and MASOUD MOSAYEBI, “THE EFFECT OF FOAM THICKNESS, SOUND INTENSITY, AND AIR LAYER ON SOUND ABSORPTION COEFFICIENT OF POLYURETHANE FOAM USING TRANSFER FUNCTION METHOD,” HEALTH SYSTEM RESEARCH, vol. 13, no. 2, pp. 0–0, 2016, [Online]. Available: https://sid.ir/paper/694882/en

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