VARIABILITY OF INTERIOR NOISE LEVELS IN PASSENGER CARS
Noise level scatter, often 10db or more in nominally identical motor vehicles, is assessed in terms of structural-acoustic characteristics. A review of the potential sources of variability indicates that only two appear to be significant: damping and phase angle. These parameters define the polar vector diagrams for determining the panel participation in the generation of noise at a point. The sources which affect coupling with the cavity mode via shifts in panel natural frequency are seen to be of much lesser significance. Finally, scatter of noise levels deriving from both damping and phase angle sources may be reduced by increasing the mean panel damping at low frequencies. For the covering abstract of the conference see TRIS 451834. (TRRL)
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Supplemental Notes:
- Vehicle Noise and Vibration. Papers read at the International Conference held at the Institution of Mechanical Engineers, London 5-7 June 1984.
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Corporate Authors:
Mechanical Engineering Publications Limited
P.O. Box 24, Northgate Avenue
Bury St Edmunds, Suffolk IP32 6BW, England -
Authors:
- WOOD, L A
- Joachim, C A
- Conference:
- Publication Date: 1984
Media Info
- Features: Figures; References;
- Pagination: p. 197-206
Subject/Index Terms
- TRT Terms: Automobiles; Conferences; Damping (Physics); Dispersion (Statistics); Motor vehicle bodies; Natural frequency; Sound; Sound level; Variables; Vehicle compartments; Vehicle interiors
- Uncontrolled Terms: Interior
- ITRD Terms: 1356: Body (car); 1243: Car; 8525: Conference; 5559: Damping; 6512: Dispersion (stat); 1377: Interior (veh); 5549: Natural frequency; 6748: Sound; 6747: Sound level
- Subject Areas: Highways; Vehicles and Equipment;
Filing Info
- Accession Number: 00451855
- Record Type: Publication
- Source Agency: Transport Research Laboratory
- Files: ITRD, TRIS
- Created Date: May 31 1986 12:00AM