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The Use of Acoustic-Intensity Scans for Sound Power Measurement and for Noise Source Identification in Surface Transportation Vehicles
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Abstract
The results are reported of near-field, acoustic-intensity scans of a diesel-engine truck, chassis-mounted passenger-car engines, and a railroad locomotive. The measurements were made using the two-microphone, cross-spectral method of measuring acoustic intensity developed at General Motors. The results demonstrate the value of the method for measuring the overall sound power of a vehicle as well as for identifying its component noise sources. A review of theory and methodology is provided.
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Authors
- J. Pope - Engineering Mechanics Dept. General Motors Research Laboratories Warren, Ml
- R. Hickling - Engineering Mechanics Dept. General Motors Research Laboratories Warren, Ml
- D. A. Feldmaier - Engineering Mechanics Dept. General Motors Research Laboratories Warren, Ml
- D. A. Blaser - Engineering Mechanics Dept. General Motors Research Laboratories Warren, Ml
Citation
Pope, J., Hickling, R., Feldmaier, D., and Blaser, D., "The Use of Acoustic-Intensity Scans for Sound Power Measurement and for Noise Source Identification in Surface Transportation Vehicles," SAE Technical Paper 810401, 1981, https://doi.org/10.4271/810401.Also In
References
- Chung J. Y. Pope J. “Practical Measurement of Acoustic Intensity - The Two-Microphone, Cross-Spectral Method.” Proceedings of the 1978 International Conference on Noise Control Engineering San Francisco CA May 1978
- Chung J. Y. “Cross-Spectral Method of Measuring Acoustic Intensity Without Error Caused by Instrument Phase Mismatch.” J. Acoust. Soc. Amer 64 1613 1616 1978
- Fahy F. J. “Measurement of Acoustic Intensity Using the Cross-Spectral Density of Two-Microphone Signals.” J. Acoust. Soc. Amer 64 1057 1059 1977
- Chung J. Y. Pope J. Feld-maier D. A. “Application of Acoustic Intensity Measurement to Engine Noise Evaluation.” Proceedings of the Diesel Engine Noise Conference, Society of Automotive Engineers, Paper No. 790502 80 1979
- Hammer W. G. “Application of Acoustic Intensity to Diesel Engine Noise Reduction.” J. Acoust. Soc. Amer. Suppl. 1 67 69 1980
- Chung J. Y. Blaser D. A. “Recent Developments in the Measurement of Acoustic Intensity Using the Cross-Spectral Method.” To be presented at the SAE National Exposition and Congress February 1981