Radiated Noise Reduction in a Single Cylinder Direct Injection (DI) Naturally Aspirated (NA) Engine 2011-01-1503
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;
Baseline radiated noise measurements of power train and identification of major noise sources through sound intensity mapping and noise source ranking (NSR) in an Engine Noise Test Cell (ENTC)
Design modifications for identified major sources in engine structure
Vehicle level assessment of the radiated noise in a Vehicle Semi-Anechoic Chamber (VSAC) for all the design modifications.
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.
Citation: Naidu T, S., Balla, C., carlson, C., and Hudson, D., "Radiated Noise Reduction in a Single Cylinder Direct Injection (DI) Naturally Aspirated (NA) Engine," SAE Technical Paper 2011-01-1503, 2011, https://doi.org/10.4271/2011-01-1503. Download Citation
Author(s):
Sudhakara Naidu T, Chaitanya Krishna Balla, Chris carlson, David Hudson
Affiliated:
Tata Motors, Ltd., Tata Motors Ltd, Tata Motors European Technical Centre pl, Tata Motors Ltd.
Pages: 12
Event:
SAE 2011 Noise and Vibration Conference and Exhibition
ISSN:
0148-7191
e-ISSN:
2688-3627
Related Topics:
Sound quality
Diesel / compression ignition engines
Noise
Test facilities
Engine cylinders
SAE MOBILUS
Subscribers can view annotate, and download all of SAE's content.
Learn More »