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Using Numerical Acoustics to Diagnose Noise Problems
Technical Paper
2005-01-2324
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Numerical acoustics has traditionally been relegated to a prediction only role. However, recent work has shown that numerical acoustics techniques can be used to diagnose noise problems. The starting point for these techniques is the acoustic transfer vector (ATV). First of all, ATV's can be used to conduct contribution analyses which can assess which parts of a machine are the predominant noise sources. As an example, the sound power contribution and radiation efficiency from parts of a running diesel engine are presented in this paper. Additionally, ATV's can be used to reliably reconstruct the vibration on a machine surface. This procedure, commonly called inverse numerical acoustics (INA), utilizes measured sound pressures along with ATV's to reconstruct the surface velocity. The procedure is demonstrated on an engine cover for which the reconstructed vibration had excellent agreement with experimental results. As a second example, the particle velocity on the open end of a duct was reconstructed. Again, there was excellent agreement with the experimental results.
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Herrin, D., Martinus, F., and Seybert, A., "Using Numerical Acoustics to Diagnose Noise Problems," SAE Technical Paper 2005-01-2324, 2005, https://doi.org/10.4271/2005-01-2324.Also In
References
- Tournour, M. Cremers, L. Guisset, P. “Inverse Numerical Acoustics Based on Acoustic Transfer Vectors” 7 th International Congress on Sound and Vibration Garmisch - Partenkirchen, Germany 2069 1076 2000
- Fahy, F. J. “The Vibro-Acoustic Reciprocity Principle and Applications to Noise Control” Acustica 81 544 558 1995
- Veronesi, W. A. Maynard, J. D. “Digital Holographic Reconstruction of Sources with Arbitrarily Shaped Surfaces” J. Acoust. Soc. Am. 85 588 598 1989
- Bai, M. R. “Application of BEM-based Acoustic Holography to Radiation Analysis of Sound Sources with Arbitrarily Shaped Geoometries” J. Acoust. Soc. Am. 92 533 549 1992
- Kim, B. K. Ih, J. G. “On the Reconstruction of the Vibro-Acoustic Field Over the Surface Enclosing an Interior Space using the Boundary Element Method” J. Acoust. Soc. Am. 100 3003 3015 1996
- Seybert, A. F. Martinus, F. “Forward and Inverse Numerical Acoustics for NVH Applications” 9 th International Congress on Sound and Vibration 714 1 Orlando, Florida July 8-11 2002
- Schuhmacher A. Hald, J. Rasmussen, K. B. Hansen, P. C. “Sound Source Reconstruction Using Inverse Boundary Element Calculations” J. Acoust. Soc. Am. 113 1 114 127 2003
- Martinus, F. Herrin, D. W. Seybert, A. F. “Practical Considerations in Reconstructing the Surface Vibration using Inverse Numerical Acoustics” SAE Noise and Vibration Conference Traverse City, Michigan May 5-8 2003
- Karlsson, S. E. S. “Identification of External Structural Loads from Measured Harmonic Responses” J. Sound Vib. 196 59 74 1996
- Tickonov, A. N. “Solution of Incorrectly Formulated Problems and the Regularization Method” Soviet Math. Dokl 4 1035 1038 1963
- Martinus, F. Herrin, D. W. Seybert, A. F. “Determining Vibration and Acoustic Particle Velocity using Inverse Numerical Acoustics” 22 nd International Modal Analysis Conference Dearborn, Michigan January 26-29 2004
- Martinus, F. Herrin, D. W. Seybert, A. F. “Reconstructing Particle Velocity on an Imaginary Surface” 11 th International Congress of Sound and Vibration St. Petersburg, Russia July 5-8 2004
- Seybert, A. F. Ross, D. F. “Experimental Determination of Acoustic Properties using a Two-Microphone Random-Excitation Technique” J. Acoust. Soc. Am. 61 1362 1370 1977