Presentation	1995/5/26 IMPROVEMENT OF SOUND ABSORPTIVE CHARACTERISTICS OF THIN FILM WITH STUDIES ON ITS EQUIVALENT ELECTRIC CIRCUIT Shosuke Koga,
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Abstract(in Japanese)	(See Japanese page)
Abstract(in English)	Sound absorptive film has not been popularly used, because of its low sound absorption coefficients, being around 30% at the peak value, in spite of some peculiar possibilities such as its transparency. Equivalent electric circuit of the film system is introduced for the improvement study. The low absorption is clearly due to the low resistance. Increase of the area of the film in contact with supporting material is expected as the best way to the desired resistance ρc. PTFE Compound film sandwiched with flattened expanded aluminum sheets of some mesh size showed high sound absorption coefficients. Multiple layers of film and air space can produce more improved characteristics by properly arranging their resonance frequencies.
Keyword(in Japanese)	(See Japanese page)
Keyword(in English)	film / absorber / equivalent circuit / absorption coefficient / resonance
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Conference Information
Committee	EA
Conference Date	1995/5/26(1days)
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Paper Information
Registration To	Engineering Acoustics (EA)
Language	JPN
Title (in Japanese)	(See Japanese page)
Sub Title (in Japanese)	(See Japanese page)
Title (in English)	IMPROVEMENT OF SOUND ABSORPTIVE CHARACTERISTICS OF THIN FILM WITH STUDIES ON ITS EQUIVALENT ELECTRIC CIRCUIT
Sub Title (in English)
Keyword(1)	film
Keyword(2)	absorber
Keyword(3)	equivalent circuit
Keyword(4)	absorption coefficient
Keyword(5)	resonance
1st Author's Name	Shosuke Koga
1st Author's Affiliation	NGK INSULATORS, LTD.()
Date	1995/5/26
Paper #
Volume (vol)	vol.95
Number (no)	70
Page	pp.pp.-
#Pages	8
Date of Issue