Exterior Noise Reduction of a Medium Truck

The paper describes the acoustic development effected in one middle-class commercial vehicle with the purpose of achieving the external sound pressure levels dictated by new Brazilian legislation. The philosophy adopted as well as the mandatory modifications of the truck to fulfill the noise limits...

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Bibliographic Details
Main Authors: Onusic, Hélcio, Ferraro, Luiz C, Hage, Marcelo M, Baptista, Edgard L, Mansano, Félix, de Freitas, Carlos A. M
Format: Report
Language:English
Online Access:Request full text
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Summary:The paper describes the acoustic development effected in one middle-class commercial vehicle with the purpose of achieving the external sound pressure levels dictated by new Brazilian legislation. The philosophy adopted as well as the mandatory modifications of the truck to fulfill the noise limits are showed together with the non-acoustic characteristics. Besides the acoustic treatment of some specific sources, it was introduced an acoustic barrier, usually called capsule or shield to reduce the noise emission of the engine-transmission assembly working by the mass law principle and sound absorption.
ISSN:0148-7191
2688-3627
DOI:10.4271/952194