This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Investigation of Acoustic Leakage of Vehicle Dash Pass-Through Components
Annotation ability available
Sector:
Language:
English
Abstract
This paper presents a systematic measurement approach for localizing the acoustic leakage of pass-through components and for determining the pass-through effects on sound transmission loss through the front vehicle dash section. The dash section is cut from a current vehicle platform and is installed on the wall of a sound transmission loss suite in which the source side is a reverberant room and the receiver side is a quiet room. The proposed approach is based on the widely-used sound intensity technique. The transmitted point and spatially averaged sound intensities through the dash section are measured with the careful control of noise flank paths and reactive fields. The approach includes sequential steps of measurements on the dash section: (1) bare panel with all holes sealed; (2) with dash insulator installed; (3) with each of four pass-through component groups installed; (4) with all pass-through component groups installed; (5) with instrumental panel installed. The acoustic leakage due to pass-through components in steps 3, 4, and 5 can be identified and ranked by displaying all point intensities into contour maps with respect to steps 1 and 2 in which no pass-through component is installed. The corresponding sound transmission loss is calculated by using the spatially averaged intensities. This approach proves to be an excellent development tool to evaluate existing and potential acoustic treatments for dash insulator and pass-through components in the vehicle front dash section.
Recommended Content
Authors
Citation
Fung, K. and Zhu, J., "Investigation of Acoustic Leakage of Vehicle Dash Pass-Through Components," SAE Technical Paper 971904, 1997, https://doi.org/10.4271/971904.Also In
References
- Crocker M.J. Raju P.K. Forssen B. 1981 “Measurement of transmission loss of panels by the direct determination of transmitted acoustic intensity,” Noise Control Engineering 17 1 6 11
- Wang Y.S. Crocker M.J. 1982 “Direct measurement of transmission loss of aircraft structures using the acoustic intensity approach,” Noise Control Engineering 19 3 80 85
- Cops A.C. Minten M. 1984 “Comparative study between the sound intensity method and the conventional two-room method to calculate the sound transmission loss of wall constructions,” Noise Control Engineering 22 3 104 116
- van Zyl B.G. Erasmus P.J. van der Merwe G.J.J. 1986 “Determination of sound reduction indices in the presence of flanking transmission,” Applied Acoustics 19 25 39
- Waser M.P. Crocker M.J. 1985 “Introduction to the Two Microphones Cross-Spectral Method of Determining Sound Intensity” Noise Control Engineering 22 2 76 85
- Bruel & Kjaer “Intensity (Theory)” Technical Review 3 1982
- Hewlett Packard “Sound Power Measurements”