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Acoustic Barriers: Properties of Mass-Spring Systems
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Abstract
We present the physical concepts of acoustic barriers which have the purpose of reducing airborne sound transmission for both paths: internal and external noise. We introduce the mass-spring model, the utilization of compound sandwiches, and the improvement of the Transmission Loss through the use of channels in the material working as spring. We show some results regarding the behavior of absorption materials exposed to environment/working conditions. In addition we discuss the effect of acoustic leaks and the way of evaluating these barriers in vehicles. We show examples based on experimental investigations.
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Onusic, H., Ferraro, L., Hage, M., and Barbosa, A., "Acoustic Barriers: Properties of Mass-Spring Systems," SAE Technical Paper 962397, 1996, https://doi.org/10.4271/962397.Also In
References
- Onusic H. Barreira Acústica de Veículos Automotores Simpósio “Acústica Veicular” AEA October 1990 30 57
- Onusic H. et al. Internal Noise Reduction of a Road Bus SAE paper 942417 SAE Brasil 94
- Onusic H. et al. Airborne Sound Isolation in Commercial Vehicles IV Int'l Seminar on Noise Control Rio de Janeiro 1992 139 142
- Ferraro L.C. Onusic H. Interior Noise Reduction of a Commercial Vehicle: Acoustic Package IV Int'l Seminar on Noise Control Rio de Janeiro 1992 143 147
- Hage M.M. Onusic H. Noise Inside Motor Vehicles: on the Calculation of AIM IV Int'l Seminar on Noise Control Rio de Janeiro 1992 129 132
- Onusic H. Hage M.M. Interior Noise of Automotive Vehicles: A Proposition for Objective Characterization SAE paper 921457 SAE Brasil 92
- Onusic H. et al. Caracterização de Ruído Interno de Veículos Anais do III Seminário Sul-Americano de Controle de Qualidade 1984 100 106
- Onusic H. et al. Exterior Noise Reductin of a Medium Truck SAE paper 952194 SAE Brasil 95
- Onusic H. Considerações Técnicas sobre a Redução dos Níveis de Emissões de Ruído em Veículos Automotores Seminário de Emissões e Combustíveis AEA 1992 181 204