Study on the identification of noise sources and reducing noise for diesel engine

Abstract

The noise of the main parts of high pressure common-rail diesel engine was analyzed in this article. The near-field noise of main parts of diesel engine was measured at different speed and load conditions. The major impact components on the engine noise were covered with composite materials, and the noise was measured. The noise of different fans on the diesel engine was analyzed. The results show that: Oil pump, oil pan, crankshaft pulley and air cleaner were the main noise sources of the engine. The near-field noise of Silicon-oil clutch fan was lower than crankshaft fan and the fan of the original machine. When composite material was covered, the noise of oil pan fuel pump diesel engine could reduce effectively. The near-field noise of main components reduced about 1 dB (A) ∼ 2dB (A) and the engine noise reduced 1.5 dB (A). © 2011 Springer-Verlag.