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Measurement of Fuel Injection Pump Sound Power Using Acoustic Intensity Techniques
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Abstract
Increasingly severe noise legislation and customer expectations for improved vehicle refinement continue to require fuel injection equipment manufacturers to reduce the noise generated by injection pumps. The measurement of injection pump noise or, more recently, sound power level has hitherto been carried out in anechoic or semi-anechoic chambers using purpose built quiet drive rigs which have themselves required continual quietening in order to allow accurate measurements to be made.
The accuracy and speed of the measurements were improved some years ago with the development of the microcomputer based Lucas-CEL sound power analysis system. However, recent advances in acoustic intensity technology due to the ready availability of low-cost processing power has led to a re-evaluation of the measurement of pump sound power. A personal computer based system using a combination of proprietary and in-house software and hardware has been developed and applied to measure pump sound power level.
This paper compares results obtained using the new system with those obtained with the old system, and discusses the relative advantages and disadvantages of the two systems. The acoustic intensity method offers some additional benefits, which are discussed and illustrated with test results.
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Citation
Balfour, G. and Banks, P., "Measurement of Fuel Injection Pump Sound Power Using Acoustic Intensity Techniques," SAE Technical Paper 930200, 1993, https://doi.org/10.4271/930200.Also In
References
- Fahy, F. “Sound Intensity” Elsevier Applied Science 1989 1 85166 319 3
- Croker, M. “The Use of Existing and Advanced Intensity Techniques to Identify Noise Sources on a Diesel Engine” SAE Paper 810694 1981
- “Determination of Sound Power Levels of Noise Sources - Engineering Methods for Free Field Conditions Over a Reflecting Plane” International Organization for Standardization
- Russell, M. Worley, S. Barham, T. Joplin, P. “Applications of a Microcomputer Based Analysis System” Noise and Vibration Worldwide July 1983 153 155
- Worley, S. “A Better Way To Measure Sound Power - Let The Machine Handle The Detail” Proc. Internoise 83 Edinburgh July 13-15 1983 Institute of Acoustics
- “Acoustics - Determination of the Sound Power Levels of Noise Sources using Sound Intensity Measurements at Discrete Points” Draft International Standard