The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 28, 2026
Filed:
Mar. 02, 2023
Southeast University, Nanjing, CN;
Hequn Min, Nanjing, CN;
Huading Lou, Nanjing, CN;
SOUTHEAST UNIVERSITY, Nanjing, CN;
Abstract
A method for measuring the normal incidence sound absorption coefficient of anon-standard sized sample is provided. First, a PAM having a specific acoustic impedance and a same thickness is arranged next to the non-standard sized sample to form a flat-surface IAIS having a same cross section as an impedance tube; a relational expression between a surface acoustic impedance of IAIS and the non-standard sized sample and PAM is obtained based on an electro-acoustic analogy method; then surface acoustic impedances of IAIS and PAM are measured in the impedance tube, respectively; and a surface acoustic impedance of the non-standard sized sample is derived from the surface acoustic impedance formula of IAIS, and the normal incidence sound absorption coefficient of the non-standard sized sample is finally obtained.