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RESEARCH PROJECT FOR REDUCING THE NOISE OF TRUCK DIESEL ENGINES
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English
Abstract
The first efforts to attenuate noise from motor vehicles go back to the 1930s. Significant developments in noise attenuation research culminating in 1974 with the presentation (FVV-AVL) of a water-cooled and an air-cooled research engine enclosed in a close-fitting capsule are addressed.
Two basic studies are described as representative of individual research carried out by commercial vehicle manufacturers: body-mounted capsules for diesel truck engines and tests on close-fitting capsules performed on the test stand.
The enclosed water-cooled engine and a basic engine without a capsule were each mounted on a truck chassis in order to test the effectiveness of the capsule and to compare measurements taken with the enclosed engine on the test stand with those taken with the engine in the vehicle. Despite the discrepancies between the two sets of data, the results of the vehicle tests were satisfactory.
Authors
Citation
Feitzelmayer, K. and Schröder, W., "RESEARCH PROJECT FOR REDUCING THE NOISE OF TRUCK DIESEL ENGINES," SAE Technical Paper 790450, 1979, https://doi.org/10.4271/790450.Also In
References
- Ass. of Automobile Manuf. “Urban traffic and noise” Feb. 1978
- StVZO = Highway code of the German Federal Republic
- FVV Physical Technical Bureau, Tech. Univ. of Berlin “Determination of sound levels of internal combustion engines” 1960
- FVV = Research Ass. for Internal Combustion Engines
- Priede T. “Noise of Automotive Diesel Engines: its cause and reduction” SAE Detroit 1965 “Some studies into engines of automotive diesel engine noise and its control” Fisita 1966
- Juhász F. “Noise reduction on an MAN truck by fully enclosing the engine” 11 1965
- FVV-AVL “Future designs of low-noise diesel engines” 1967
- Thien G.E. Fachbach H.A. “A new design concept of low-noise diesel engines” 35 8 1974
- “Close fitting capsule on the MAN engine D 0836 HM 91 U” internal research report 1968
- Institute for Internal Combustion Engines Graz, Austria
- Vehicle A - With low-noise research engine
- Vehicle B - Standard engine without capsule
- ISO R 362 - Acceleration drive-by noise test
- ECE R-9 Revised - Sound level test in acc. with ISO R 362, but using highest gear in which the cutoff speed is not reached within the test range (line A-A to B-B)