THE USE OF DIGITAL FOURIER TRANSFORM METHODS IN ENGINE NOISE RESEARCH

Recent developments by the author in the application of digital Fourier transform (DFT) methods, i.e., coherence and transfer function techniques to the investigation of noise from an engine are discussed. The transfer functions are determined empirically and they can be used to determine the mechanism of noise generation of an engine. They can also by used to predict the effect on engine noise of various assumed cylinder pressure wave forms. Among other results, it is demonstrated that the rapid pressure rise in the cylinder pressure has a strong effect on engine noise. /GMRL/

• Corporate Authors:

  Society of Automotive Engineers (SAE)

  400 Commonwealth Drive
  Warrendale, PA  United States  15096
• Authors:
  • Chung, J Y
• Publication Date: 0

Media Info

• Pagination: 10 p.

Subject/Index Terms

• TRT Terms: Digital computers; Engines; Fourier transforms; Noise; Pressure; Research; Transfer functions; Waveform analysis
• Uncontrolled Terms: Cylinders; Digital techniques
• Old TRIS Terms: Coherence /physical/; Engine noise; Waveform
• Subject Areas: Environment; Highways; Research; Safety and Human Factors; Vehicles and Equipment;

Filing Info

• Accession Number: 00158391
• Record Type: Publication
• Files: TRIS
• Created Date: Dec 8 1977 12:00AM