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An Experimental/Numerical Noise Source Identification Technique
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English
Abstract
A technique is developed which utilizes numerical models and in situ measurements to characterize acoustic fields and identify noise sources. The numerical model is based on boundary element numerical procedures and is used to characterize the acoustic cavity. Passive boundary conditions in the form of impedance boundary conditions are used for the numerical model. The sound field is found by measuring several pressures in the acoustic field and using the data to overdetermine the numerical problem and solve for the complete sound field. The model can then be used to identify acoustic energy paths in the field. The model can also be used to evaluate design alternatives.
The method has been tested analytical and verified. In addition, the sensitivity of the method to error in the impedance data or measurement data was tested and found to be acceptable.
Authors
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Citation
Gardner, B. and Bernhard, R., "An Experimental/Numerical Noise Source Identification Technique," SAE Technical Paper 870995, 1987, https://doi.org/10.4271/870995.Also In
References
- Fahy F.J. “Measurement of Acoustic intensity Using the Cross-Spectral Density of Two Microphone Signals,” Journal of the Acoustic Society of America 62 4 1977 1057 1059
- Chung J.Y. “Cross-Spectral Method of Measuring Acoustic intensity Without Error Caused by instrument Phase Mismatch,” Journal of the Acoustic Society of America 64 6 1978 1613 1616
- Elko G.W. “Frequency Domain Estimation of the Complex Acoustic intensity and Acoustic Energy Density,” Ph.D. Thesis Pennsylvania State University 1984
- Williams E.G. Maynard J.D. Skudrzyk E. “Sound Source Reconstruction Using a Microphone Array,” Journal of the Acoustic Society of America 68 1 1980 340 344
- Chertock G. “Sound Radiation from Vibrating Surfaces,” Journal of Acoustical Society of America 36 7 1964 1305 1313
- Copley L.G. “Fundamental Results Concerning integral Representations in Acoustic Radiation,” Journal of Acoustical Society of America 44 1 1968 28 32
- Schenck H.A. “Improved integral Formulation for Acoustic Radiation Problems,” Journal of Acoustical Society of America 44 1 1968 41 58
- Seybert A.F. Rizzo F.J. Shippy D.J. “Application of the BIE Method to Sound Radiation Problems Using an Isoparametric Element,” ASME Journal Vibrations. Acoustics. Stress, and Reliability in Design 106 1984 414 420
- Koopmann G.H. Benner H. “Method of Computing the Sound Power of Machines Based on the Helmholtz integral,” Journal of Acoustical Society of America 71 1 1982 78 89
- Bernhard R.J. Gardner B.K. Mollo C.G. Kipp C.R. “Prediction of Sound Fields in Cavities Using Boundary Element Methods,” AIAA Paper No. 86-1864 1986
- Astley R.J. “Acoustic Radiation in Low Mach Number Flows: A Transformed Boundary Element Approach,” AIAA Paper No.-84-2288 1984
- Hald J. Roth O. “Spatial Transformation of Sound Fields,” B&K Document No. BA 7210-1 1985