Small goods carrier and passenger vehicles powered by Naturally Aspirated (NA) Direct Injection (DI) diesel engines are popular in Indian automobile market. However, they suffer from inherently high radiated noise and poorly perceived sound quality. This paper documents the steps taken to reduce the radiated noise level from such an engine through structural modifications of major noise radiating components identified in the sound power analysis. The work is summarized as follows; A reduction of 7 dB at hot idle and 4 - 8 dB in loaded speed sweep conditions was observed with the recommended modifications. There was also a reduction of 2.6 dB in pass by noise levels with significant improvement in sound quality, although in-cab noise of the vehicle was only marginally influenced.
Radiated Noise Reduction in a Single Cylinder Direct Injection (DI) Naturally Aspirated (NA) Engine
Sae Technical Papers
SAE 2011 Noise and Vibration Conference and Exhibition ; 2011
2011-05-17
Aufsatz (Konferenz)
Englisch
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