ACOUSTIC TRANSMISSION ANALYSIS OF MULTI-LAYER ABSORBERS

✍ Scribed by F.-C. LEE; W.-H. CHEN

• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 497 KB
• Volume: 248
• Category: Article
• ISSN: 0022-460X
• DOI: 10.1006/jsvi.2001.3825

✦ Synopsis

A simple but accurate analytical acoustic transmission analysis (ATA) is developed for evaluating the acoustic absorption of the multi-layer acoustic absorber. Unlike other analytical approaches available in literature, the present ATA can deal with the multi-layer acoustic absorber containing several compartments. Each compartment may include the layers of perforated plates, airspaces and porous materials together. The continuity of the particle velocity at the interfaces among perforated plates, airspaces and porous materials is assumed. The e!ects of the back surface acoustic impedance of both airspaces and porous materials are also taken into account. After combining those compartments, the resultant acoustic impedance and acoustic absorption coe$cient of the multi-layer acoustic absorber can be obtained. For demonstration, four di!erent types of multi-layer acoustic absorbers are analyzed. The results are also veri"ed by relevant experiments or "nite-element analysis. Finally, several important in#uence factors that a!ect the acoustic absorption of the multi-layer acoustic absorber are discussed.