IDENTIFICATION OF INTERNAL NOISE SOURCES IN DIESEL ENGINES

In order to identify noise sources in a diesel engine, specifically exciting forces such as combustion and piston slap, the so-called coherence method which utilizes relationships between the auto and cross spectra of cylinder pressure, cylinder liner acceleration and engine noise has been examined. Also, as an alternative, a multivariable regression analysis in one-third octave band auto spectra of each signal mentioned above has been made. It was shown that the simple coherence model studied does not seem useful for this particular type of noise source identification problem. However, the multivariable regression approach has yielded fairly reasonable results, though some problems have been found in accuracy. From this research, it was found that combustion noise is predominant for heavier engine load conditions, though at lower load and high speed conditions, piston slap noise becomes appreciable.

• Supplemental Notes:
  • A Worldwide View of Diesel Combustion Emissions and Analysis, P-130. International Off-Highway Meeting and Exposition Milwaukee, Wisconsin, September 12-15, 1983.
• Corporate Authors:

  Society of Automotive Engineers (SAE)

  400 Commonwealth Drive
  Warrendale, PA  United States  15096
• Authors:
  • Yawata, Y
  • Crocker, M J
• Publication Date: 1983-9

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 151-162
• Serial:
  • Publication of: Arbetarskyddsfonden
  • Publisher: Arbetarskyddsfonden

Subject/Index Terms

• TRT Terms: Combustion; Diesel engines; Mathematical models; Noise; Pistons
• Uncontrolled Terms: Models
• Old TRIS Terms: Cylinder pressure
• Subject Areas: Environment; Safety and Human Factors;

Filing Info

• Accession Number: 00382410
• Record Type: Publication
• Source Agency: National Highway Traffic Safety Administration
• Files: HSL, USDOT
• Created Date: Mar 30 1984 12:00AM