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- Title
INSERTION LOSS STUDIES ON SMALL PANEL ABSORBER TYPE MUFFLERS USING THE DISTRIBUTEDSPRING-MASS SYSTEM APPROACH.
- Authors
SRIDHARA, Basavapatna S.
- Abstract
Panel absorbers have been used widely to reduce noise level in rooms and auditoriums. They are also used as enclosures to reduce noise radiated from industrial gear boxes and machinery. Some research has been carried out on the application of panel absorber type mufflers in pipes and ducts. In most cases, the panels used in these mufflers are much smaller than those used in architectural and machinery applications. Therefore, they cannot be treated as single-degree of freedom systems as the panel supports or boundary conditions influence the performance of the panel absorbers. Sridhara has conducted some research on small panel absorbers.1 They formulated the governing equations for the free vibration of a rectangular panel backed by an air gap using the energy method. The equations were solved for a panel simply supported along its edges using a double Fourier series. The natural frequencies were been calculated for two different panel absorbers also presented for the large size panel absorber. In this paper Sridhara's further research on panel absorbers using the distributed spring-mass system approach is briefly discussed. Expressions for impedance of a panel absorber that is simply supported along its edges are developed. Computer programs have been developed for calculating panel absorber impedance and insertion loss. Two different size panels have been considered in the analysis. Insertion loss of the two panel absorbers has been calculated using the distributed spring-mass system approach. These values have been compared with the measured insertion loss. The measured insertion loss values show agreement with the computed values at some frequencies and a large variation at some other frequencies. We may have to study the application of the vibrating membrane analogy to a vibrating panel absorber to resolve these issues.
- Subjects
NOISE control research; INSERTION loss (Telecommunication); DEGREES of freedom; FOURIER series; SPRINGS (Mechanisms); VIBRATION absorption
- Publication
Journal of Information Systems Technology & Planning, 2016, Vol 8, Issue 19, p121
- ISSN
1945-5240
- Publication type
Article