摘要:

The flow resistance is one of the three physical parameters of a uniform, rigid, porous material which completely determine its acoustic behavior; for more complicated materials and sound absorbing structures the flow resistance gives at least some acoustic information. Thespecific flow resistivityor flow resistance per unit cube is given by the equationr = pAt/Vt, in whichpis the pressure drop in dynes per cm2across the thicknesslcm of a sample of areaAcm2when a volumeVcc of air flows steadily through the sample in a timetsec. An accurate method has been developed for obtainingrby direct measurements of the quantitiesp, A, t, V, andl. Using this method flow resistance measurements have been made on twenty‐four materials over a wide range of velocities. The measurements show that for nearly all materials there is a variation of flow resistance with velocity. For most materials the resistivity is constant below 0.1 cm per sec. but increases considerably at higher velocities. It is shown that previously described comparison methods, which have the advantages of simplicity and speed, might yield results in serious error unless certain suggested precautions are observed. As indicated previously, a direct correlation is found between the steady state flow resistance values and the resistive component of acoustic impedance for several materials. Analysis of the data also yields additional information bearing on the basic physical processes involved in the absorption of sound in these materials. In addition, the measurement of flow resistance has practical applications, such as the rapid routine checking of uniformity of samples of porous materials.

ISSN:0001-4966    

DOI:10.1121/1.1916184

出版商:Acoustical Society of America    

年代:1942

数据来源: AIP

摘要:

The filtration characteristics of five Quincke‐Herschel tubes in series were measured in three ways: (a) by observing the ratio of the squares of the excess pressures at the end and beginning of the filter when terminated by a closed and open finite ending; (b) by observing the phase difference between these two pressures for the two cases in (a); and (c) by observing the true power transmission ratio with the filter terminated by an effectively infinite line. The experimental results are plotted with the corresponding theoretical curves. The number of experimental peaks in the transmission regions in (a) and (c), and the positions of the attenuation bands agree with the predictions of the theory. The values of the curve minima in the transmission bands are in excellent agreement up to 5000 cycles. The change of phase over the filter was also found to correspond closely to the theory.

ISSN:0001-4966    

DOI:10.1121/1.1916185

出版商:Acoustical Society of America    

年代:1942

数据来源: AIP

摘要:

This paper presents an experimental and theoretical study of the filtering action of a structure consisting of five stretched circular membranes equally spaced in an acoustic conduit, together with an experimental study of the effect on the transmission of puncturing the membranes with different sized holes. The stretched membrane filter is high pass, while the punctured orifices of sufficient diameter change the structure to a low pass type. This study shows that it is valid to assume plane wave propagation in the circular membrane filter up to 5000 cycles.

ISSN:0001-4966    

DOI:10.1121/1.1916187

出版商:Acoustical Society of America    

年代:1942

数据来源: AIP

ISSN:0001-4966    

DOI:10.1121/1.1916188

出版商:Acoustical Society of America    

年代:1942

数据来源: AIP

ISSN:0001-4966    

DOI:10.1121/1.1916189

出版商:Acoustical Society of America    

年代:1942

数据来源: AIP

ISSN:0001-4966    

DOI:10.1121/1.1916190

出版商:Acoustical Society of America    

年代:1942

数据来源: AIP

ISSN:0001-4966    

DOI:10.1121/1.1916191

出版商:Acoustical Society of America    

年代:1942

数据来源: AIP

ISSN:0001-4966    

DOI:10.1121/1.1916192

出版商:Acoustical Society of America    

年代:1942

数据来源: AIP

ISSN:0001-4966    

DOI:10.1121/1.1916193

出版商:Acoustical Society of America    

年代:1942

数据来源: AIP

ISSN:0001-4966    

DOI:10.1121/1.2142320

出版商:Acoustical Society of America    

年代:1942

数据来源: AIP