SPECTRAL ANALYSES IN TRUCK TIRE NOISE FIELDS
This paper discusses the importance of the spectral distribution of the energy in the sound to the dB(A) level of the usual passby test. A described technique obtains reproducible "real-time" spectra from the nonstationary sound field. Doppler effect and source frequency shift are quantified in relating these spectra to the tread pattern repetitions. Inverse square law fitting is viewed through the two-source-microphone relation which changes during the spectral window period. Spectra are shown for 6, 12, and 50 ft (1.83, 3.66, and 15.2 m) passby microphones and for a microphone carried on the truck.
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Corporate Authors:
Society of Automotive Engineers (SAE)
400 Commonwealth Drive
Warrendale, PA United States 15096 -
Authors:
- Miler, R C
- Thrasher, D B
- Publication Date: 1974
Media Info
- Features: Figures; References; Tables;
- Pagination: 8 p.
Subject/Index Terms
- TRT Terms: Doppler effect; Measurement; Motion; Motor vehicles; Sound level; Spectrum analysis; Tire treads; Tires; Traffic noise; Trucks
- Uncontrolled Terms: Moving vehicles
- Old TRIS Terms: Truck noise
- Subject Areas: Highways; Motor Carriers; Safety and Human Factors; Vehicles and Equipment;
Filing Info
- Accession Number: 00095778
- Record Type: Publication
- Report/Paper Numbers: SAE No. 740608
- Files: TRIS
- Created Date: Jul 2 1975 12:00AM