THE FOURIER TRANSFORM APPLIED TO VEHICLE EXTERIOR NOISE SOURCE IDENTIFICATION

This paper discusses a motor vehicle noise source identification technique designed for use during the SAE J986a or similar drive-by test procedure. It provides, by application of the Fourier Transform, the capability to obtain a narrowband (9.8 Hz) frequency resolution over an extended frequency range (0-10,000 Hz) at the peak vehicle noise level, a particular RPM, or a particular vehicle location in the test zone. Other features include corrections for the Doppler shift, averaging of noise tests, and subtraction of spectra of two separate noise tests from a component disconnect/reconnect procedure. /GMRL/

• Corporate Authors:

  Society of Automotive Engineers (SAE)

  400 Commonwealth Drive
  Warrendale, PA  United States  15096
• Authors:
  • Daniels, V A
  • Veres, R E
• Publication Date: 1976-2

Media Info

• Pagination: 8 p.

Subject/Index Terms

• TRT Terms: Doppler effect; Fourier analysis; Frequency (Electromagnetism); Sound level
• Subject Areas: Highways; Safety and Human Factors;

Filing Info

• Accession Number: 00145201
• Record Type: Publication
• Report/Paper Numbers: SAE #760151
• Files: TRIS
• Created Date: May 11 1977 12:00AM