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.
Citation: Onusic, H., Ferraro, L., Hage, M., Baptista, E. et al., "Exterior Noise Reduction of a Medium Truck," SAE Technical Paper 952194, 1995, https://doi.org/10.4271/952194. Download Citation
Author(s):
Hélcio Onusic, Luiz C. Ferraro, Marcelo M. Hage, Edgard L. Baptista, Félix Mansano, Carlos A. M. de Freitas
Affiliated:
MERCEDES-BENZ DO BRASIL S.A. and IFUSP
Pages: 11
Event:
1995 SAE Brasil
ISSN:
0148-7191
e-ISSN:
2688-3627
Related Topics:
Commercial vehicles
Exterior noise
Acoustics
Trucks
Noise
Assembling
SAE MOBILUS
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