Title:
METHOD FOR MEASURING NORMAL INCIDENCE SOUND ABSORPTION COEFFICIENT OF NON-STANDARD-SIZE SAMPLE
Document Type and Number:
WIPO Patent Application WO/2024/066200
Kind Code:
A1
Abstract:
Disclosed in the present invention is a method for measuring a normal incidence sound absorption coefficient of a non-standard-size sample, comprising: first, beside the non-standard-size sample, arranging an acoustic material PAM having specific acoustic impedance and the same thickness, so as to form a discontinuous impedance test piece IAIS having the same cross section as an impedance tube and a flat surface; obtaining a relational expression between surface acoustic impedance of IAIS and the non-standard-size sample and PAM on the basis of an acoustoelectric analogy method; then respectively measuring the surface acoustic impedance of IAIS and the surface acoustic impedance of PAM in the impedance tube; and according to a surface acoustic impedance formula of IAIS, obtaining the surface acoustic impedance of the non-standard-size sample by means of reverse deduction, and finally obtaining a normal incidence sound absorption coefficient of the non-standard-size sample. Therefore, high-precision measurement of a normal incidence sound absorption coefficient of a non-standard-size porous material or resonance sound absorption material having any cross-sectional size and shape can be achieved.
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Inventors:
MIN HEQUN (CN)
LOU HUADING (CN)
LOU HUADING (CN)
Application Number:
PCT/CN2023/079216
Publication Date:
April 04, 2024
Filing Date:
March 02, 2023
Export Citation:
Assignee:
UNIV SOUTHEAST (CN)
International Classes:
G01N29/09
Foreign References:
| CN115508451A | 2022-12-23 | |||
| CN110231408A | 2019-09-13 | |||
| JP2012202802A | 2012-10-22 |
Other References:
HUADING LOU ET AL.: "Measurements of the normal incidence sound absorption coefficient for Non-standard sized absorbers in impedance tubes", MEASUREMENT, vol. 203, 26 September 2022 (2022-09-26), XP087213316, ISSN: 0263-2241, DOI: 10.1016/j.measurement.2022.111989
LEI, BIN ET AL.: "Measurement of Sound Absorption Coefficient of Small-diameter Sample by Using Large-diameter Standing Wave Tube", TECHNICAL ACOUSTICS, vol. 11, no. 1, 2, 31 December 1992 (1992-12-31)
FENG, TAO ET AL.: "Calculation of the Equivalent Impedance of the Parallel Acoustic Material at the Duct End", TECHNICAL ACOUSTICS, vol. 29, no. 6, 31 December 2010 (2010-12-31)
LEI, BIN ET AL.: "Measurement of Sound Absorption Coefficient of Small-diameter Sample by Using Large-diameter Standing Wave Tube", TECHNICAL ACOUSTICS, vol. 11, no. 1, 2, 31 December 1992 (1992-12-31)
FENG, TAO ET AL.: "Calculation of the Equivalent Impedance of the Parallel Acoustic Material at the Duct End", TECHNICAL ACOUSTICS, vol. 29, no. 6, 31 December 2010 (2010-12-31)
Attorney, Agent or Firm:
BEIJING TONGHUI INTELLECTUAL PROPERTY AGENCY (GENERAL PARTNERSHIP) (CN)
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