On the acoustic absorption of porous materials with different surface shapes and perforated plates

被引:73
作者
Chen, WH [1 ]
Lee, FC [1 ]
Chiang, DM [1 ]
机构
[1] Natl Tsing Hua Univ, Dept Power Mech Engn, Hsinchu 30043, Taiwan
关键词
D O I
10.1006/jsvi.2000.3029
中图分类号
O42 [声学];
学科分类号
070206 ; 082403 ;
摘要
In architectural acoustic design, perforated plates are often used to protect porous materials from erosion. Although porous materials are usually applied to passive noise control, the effects of their surface shapes are seldom studied. To study the acoustic absorption of porous materials with different surface shapes and perforated plates, an efficient finite element procedure, which is derived by the Galerkin residual method and Helmholtz wave propagation equation, is used in this work. The two-microphone transfer function method and the modified Ingard and Dear impedance tube testing system are employed to measure the parameters deemed necessary for the finite element analysis, such as complex wave propagation constant, characteristic impedance and flow resistivity. For verifying the finite element results, the two-microphone transfer function method is also applied to measure the absorption coefficients of the discussed acoustic absorbers. Four surface shapes of commercially available porous materials, i.e., triangle, semicircle, convex rectangle and plate shapes, are chosen for analysis. The porosity of perforated plates is then evaluated. Finally, the distinct effect of the flow resistivity of porous materials on the acoustic absorption is demonstrated. (C) 2000 Academic Press.
引用
收藏
页码:337 / 355
页数:19
相关论文
共 18 条
[1]  
[Anonymous], NOISE CONT ENG J
[2]   A FINITE-ELEMENT SCHEME FOR ATTENUATION IN DUCTS LINED WITH POROUS MATERIAL - COMPARISON WITH EXPERIMENT [J].
ASTLEY, RJ ;
CUMMINGS, A .
JOURNAL OF SOUND AND VIBRATION, 1987, 116 (02) :239-263
[3]  
BERANEK LL, 1992, NOISE VIBRATION CONT, pCH8
[4]   FLOW RESISTANCE INFORMATION FOR ACOUSTICAL DESIGN [J].
BIES, DA ;
HANSEN, CH .
APPLIED ACOUSTICS, 1980, 13 (05) :357-391
[5]   TRANSFER-FUNCTION METHOD OF MEASURING IN-DUCT ACOUSTIC PROPERTIES .1. THEORY [J].
CHUNG, JY ;
BLASER, DA .
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, 1980, 68 (03) :907-913
[6]   FINITE-ELEMENT MODEL FOR RIGID POROUS ABSORBING MATERIALS [J].
CRAGGS, A .
JOURNAL OF SOUND AND VIBRATION, 1978, 61 (01) :101-111
[7]   FINITE-ELEMENT METHOD FOR MODELING DISSIPATIVE MUFFLERS WITH A LOCALLY REACTIVE LINING [J].
CRAGGS, A .
JOURNAL OF SOUND AND VIBRATION, 1977, 54 (02) :285-296
[8]   COUPLING OF FINITE-ELEMENT ACOUSTIC ABSORPTION MODELS [J].
CRAGGS, A .
JOURNAL OF SOUND AND VIBRATION, 1979, 66 (04) :605-613
[9]   SOUND-ATTENUATION IN DUCTS LINED ON 2 OPPOSITE WALLS WITH POROUS MATERIAL, WITH SOME APPLICATIONS TO SPLITTERS [J].
CUMMINGS, A .
JOURNAL OF SOUND AND VIBRATION, 1976, 49 (01) :9-35
[10]   PERFORATED FACINGS BACKED WITH POROUS MATERIALS AS SOUND ABSORBERS - EXPERIMENTAL-STUDY [J].
DAVERN, WA .
APPLIED ACOUSTICS, 1977, 10 (02) :85-112