Description of a method of reducing the drive-by noise levels radiated from a 14 litre diesel engined truck by utilising a combination of conventional noise reduction techniques applied to the engine. The combustion and mechanical exciting forces within the engine were lowered by turbocharging and low noise pistons respectively, coupled with a small reduction in the rated speed. The resultant radiated noise was largely attenuated by employing simple shielding arranged to form a tunnel around the engine and attached to the engine with isolation mounts. It has been shown that the drive-by noise level can be lowered from 92,5 dBA to 82 dBA with this treatment. Furthermore, a level of 80 dBA was achieved when some additional silencing and shielding was applied to the non-engine noise sources. The paper also includes a method of calculating the radiated combustion and mechanical noise levels from an engine. (Wassmann)
A practical approach to truck noise reduction
Eine praktische Methode zur Geraeuschverminderung bei Lastkraftwagen
1979
10 Seiten, 9 Bilder, 1 Tabelle, 15 Quellen
Conference paper
English
Practical approach to truck noise problem
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