Enhancement of acoustical performance of hollow tube sound absorber

This paper presents acoustical performance of hollow structures utilizing the recycled lollipop sticks as acoustic absorbers. The hollow cross section of the structures is arranged facing the sound incidence. The effects of different length of the sticks and air gap on the acoustical performance are...

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Hauptverfasser:	Putra, Azma, Khair, Fazlin Abd, Nor, Mohd Jailani Mohd
Format:	Tagungsbericht
Sprache:	eng
Schlagworte:	Absorbers ABSORPTION Absorptivity Acoustic absorption Acoustic impedance ACOUSTICS Air gaps CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS FIBERS IMPEDANCE LENGTH Magnetism Noise control Sound Sound transmission SOUND WAVES SURFACES TUBES VOIDS
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creator	Putra, Azma Khair, Fazlin Abd Nor, Mohd Jailani Mohd
description	This paper presents acoustical performance of hollow structures utilizing the recycled lollipop sticks as acoustic absorbers. The hollow cross section of the structures is arranged facing the sound incidence. The effects of different length of the sticks and air gap on the acoustical performance are studied. The absorption coefficient was measured using impedance tube method. Here it is found that improvement on the sound absorption performance is achieved by introducing natural kapok fiber inserted into the void between the hollow structures. Results reveal that by inserting the kapok fibers, both the absorption bandwidth and the absorption coefficient increase. For test sample backed by a rigid surface, best performance of sound absorption is obtained for fibers inserted at the front and back sides of the absorber. And for the case of test sample with air gap, this is achieved for fibers introduced only at the back side of the absorber.
doi_str_mv	10.1063/1.4943489
format	Conference Proceeding
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The hollow cross section of the structures is arranged facing the sound incidence. The effects of different length of the sticks and air gap on the acoustical performance are studied. The absorption coefficient was measured using impedance tube method. Here it is found that improvement on the sound absorption performance is achieved by introducing natural kapok fiber inserted into the void between the hollow structures. Results reveal that by inserting the kapok fibers, both the absorption bandwidth and the absorption coefficient increase. For test sample backed by a rigid surface, best performance of sound absorption is obtained for fibers inserted at the front and back sides of the absorber. 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The hollow cross section of the structures is arranged facing the sound incidence. The effects of different length of the sticks and air gap on the acoustical performance are studied. The absorption coefficient was measured using impedance tube method. Here it is found that improvement on the sound absorption performance is achieved by introducing natural kapok fiber inserted into the void between the hollow structures. Results reveal that by inserting the kapok fibers, both the absorption bandwidth and the absorption coefficient increase. For test sample backed by a rigid surface, best performance of sound absorption is obtained for fibers inserted at the front and back sides of the absorber. And for the case of test sample with air gap, this is achieved for fibers introduced only at the back side of the absorber.</abstract><cop>Melville</cop><pub>American Institute of Physics</pub><doi>10.1063/1.4943489</doi><tpages>8</tpages></addata></record>
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source	AIP Journals Complete
subjects	Absorbers ABSORPTION Absorptivity Acoustic absorption Acoustic impedance ACOUSTICS Air gaps CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS FIBERS IMPEDANCE LENGTH Magnetism Noise control Sound Sound transmission SOUND WAVES SURFACES TUBES VOIDS
title	Enhancement of acoustical performance of hollow tube sound absorber
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