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Localization of BSR Noise Source Using the Improved 3D Intensity Method
ISSN: 0148-7191, e-ISSN: 2688-3627
Published June 13, 2018 by SAE International in United States
Annotation ability available
Event: 10th International Styrian Noise, Vibration & Harshness Congress: The European Automotive Noise Conference
A three-dimensional (3D) sound intensity probe is used to identify the trim components generating buzz, squeak, and rattle (BSR) noise in a vehicle interior. The 3D intensity probe has the advantages of compact overall size, small number of microphones, and low-frequency detection capability. Although the 3D sound intensimetry has been not popularly applied in practical problems due to various bias errors, a new error compensation method is adopted in this work, substantially improving the estimate’s precision. Linearization of the phase function of the cross-spectral density function between a set of two microphones is used to calculate the intensity avoiding spectral bias error, and an error map for spatial angles is used to compensate for the difference in directivity index around the microphone array. An intensity probe with an even microphone spacing of 30 mm in tetrahedral arrangement is used for the source localization. The interior space is usually a nearly dead room in terms of absorption, but the reverberation effect cannot be neglected due to the small space. Experiments are conducted by using the artificially generated and edited signals pertaining the typical characteristics of each BSR noise. Various source positions are selected, such as the instrument panel, door hinge, seat, etc., and the sound levels of the source and background are changed. The estimated bearing angles of the noise sources are analyzed on a two-dimensional plot. It is found that the localization error is generally less than 6°, which demonstrates the full possibility of using this improved 3D intensity technique for the localization of BSR noise sources in the real time.
CitationJung, I., "Localization of BSR Noise Source Using the Improved 3D Intensity Method," SAE Technical Paper 2018-01-1530, 2018, https://doi.org/10.4271/2018-01-1530.
- Kavarana, F. and Benny, R., “Squeak and Rattle-State of the Art and Beyond,” SAE Technical Paper 1999-01-1728, 1999, doi:10.4271/1999-01-1728.
- Grenier, G.C., “The Rattle Trap,” SAE Technical Paper 2003-01-1525, 2003, doi:10.4271/2003-01-1525.
- Cerrato, G., “Automotive Sound Quality-Accessories, BSR, and Brakes,” Sound and Vibration: 10-15, September 2009.
- Gosavi, S.S., “Automotive Buzz, Squeak and Rattle (BSR) Detection and Prevention,” SAE Technical Paper 2005-26-056, 2005, doi:10.4271/2005-26-056.
- Lee, J.-H., “Development of a Test Method for BSR Noise and the Full-Vehicle Testing System,” SAE Technical Paper 2014-01-0822, 2014, doi:10.4271/2014-01-0822.
- Ih, J.-G., Woo, J.-H., and Cho, S.-K., “Acoustic Source Localization by Using Twisted Double-Module 3D Intensity Array,” Proc. of Inter-Noise, Innsbruck, September 15-18, 2013.
- Jung, I.-J., Ih, J.-G., and Woo, J.-H., “Source Localization with Three-Dimensional Sound Intensity Probe with High Precision,” Joint Meeting of ASA and EAA, Boston, June 25-29, 2017, doi:10.1121/1.4987659.
- Pavić, G., “Measurement of Sound Intensity,” Journal of Sound and Vibration 51(4):533-545, 1977, doi:10.1016/S0022-460X(77)80050-3.
- Fahy, F.J., “Measurement of Acoustic Intensity Using the Cross-Spectral Density of two Microphone Signals,” Journal of the Acoustical Society of America 62(4):1057-1059, 1977, doi:10.1121/1.381601.
- Pascal, J.C. and Li, J.F., “A Systematic Method to Obtain 3D Finite-Difference Formulations for Acoustic Intensity and Other Energy Quantities,” Journal of Sound and Vibration 310(4):1093-1111, 2008, doi:10.1016/j.jsv.2007.08.029.
- Bendat, J.S. and Piersol, A.G., Random Data: Analysis and Measurement ProceduresFourth Edition (Hoboken: Wiley, 2011), 118-126. ISBN:978-0-470-24877-5.
- Seybert, A.F. and Ross, D.F., “Experimental Determination of Acoustic Properties Using a Two-Microphone Random-Excitation Technique,” Journal of the Acoustical Society of America 61(5):1362-1370, 1977, doi:10.1121/1.381403.
- Wikipedia, “Kokeshi,” accessed December 2017, https://en.wikipedia.org/wiki/Kokeshi.
- Zwicker, E. and Fastl, H., Psychoacoustics: Facts and Models (New York: Springer-Verlag, 1990), 141-147. ISBN:0-387-52600-5.