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Determination of the noise contributions of engine surfaces
Technical Paper
2001-01-1482
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
One of the key elements in efforts to minimize the noise emmissionis of engines and other machinery is the knowledge of the main noise radiating surfaces and the relation between measurable surface vibration and the sound pressure.
Under the name of Airborne Source Quantification (ASQ), various techniques have been developed to discretize and quantify the source strength, and noise contributions, of vibrating surface patches of machinery or vehicle components. The noise contributions of patches to the sound pressure at specific locations in the sound field or to the total radiated sound power are identified. The source strength of equivalent point sources, the acoustic transfer from the source surface to critical sound field locations and finally the sound pressure contributions of the individual patches are quantified.
These techniques are not unique to engine application, but very relevant for engine development. An example is shown for an engine under artificial excitation.
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Citation
van der Linden, P., Keppens, T., Raff, J., and Schnur, J., "Determination of the noise contributions of engine surfaces," SAE Technical Paper 2001-01-1482, 2001, https://doi.org/10.4271/2001-01-1482.Also In
References
- Mason, Fahy «Application of a Reciprocity Technique for the Determination of the Contribution of Various Regions of Vibrating Body to the Sound Pressure at a Receiver Point» Proceedings of the Institute of Acoustics 12 1990 409 476
- Verheij Hoebrichts Thompson “Acoustical Source Strength Characterization for Heavy Road Vehicles Engines in Connection with Pass-By Noise” Third International Congress on Air- and Structureborne Sound and Vibration June 1994 Montreal
- van der Linden P.J.G. De Meester K. «Airborne Source Strength measurements on the basis of pressure indicator inversion applied to an engine valve cover» Fourth International Congress on Sound and Vibration St-Petersburg 1996
- van der Linden Mantovani “The Validity of Reciprocal Acoustic Transfer Function Measurements on Trucks for Pass-By Noise” Internoise 1996
- 01NVC-182 Combining Vehicle and Test-Bed Diagnosis Information to Guide Vehicle Development for Pass-By Noise Fleszar A. R. van der Linden P.J.G. Johnson J. R. Grimmer M. J. SAE Traverse city 2001
- Fahy F. «The reciprocity principle and applications in vibro acoustics» Second International Congress on Recent Developments in air- and structure borne sound and vibration March 4-6 1992 591 598
- van der Linden P.J.G. Fun J.K. «Using mechanical-Acoustic Reciprocity for diagnosis of structure borne sound in vehicles» SAE 93130
- Verheij J.W. «Inverse and Reciprocity Methods for Machinery Noise source Characterisation and Quantification» Fourth International Congress on Sound and Vibration 1996 St-Petersburg
- 01NVC-218 Engine Internal Dynamic Force Identification and the Combination with Engine Structural and Vibro-Acoustic Transfer Information Van Herbruggen J. van der Linden P.J.G. Knittel H.-J. Schnur J. SAE Traverse City 2001
- 99NV-266 Modular Vehicle Noise and Vibration Development van der Linden P.J.G. Wyckaert K. SAE traverse City 1999
- Test-based identification of panel noise contribution and of structural mode noise contributions of a body in white van der Linden P.J.G. Michiels K. Storer D. I-Mech-E London 1999