NOISE SOURCE IDENTIFICATION UNDER STEADY AND ACCELERATING CONDITIONS ON A TURBOCHARGED DIESEL ENGINE

Experiments were conducted to obtain a quantitative comparison between the noise ranking of turbocharged diesel engine components using new sound intensity and conventional lead wrapping techniques, and to analyze the causes of the sudden increase in noise level observed during the initial acceleration phase. The sound pressure levels obtained with the two techniques are in good agreement above 315 Hz. Below that frequency the lead wrapping has inadequate transmission loss. Although the surface intensity technique in its present development state is still time consuming, it does produce essential information about surface vibration levels for use in component redesign to reduce noise. The acceleration test results indicate that the increased sound pressure level is directly related to combustion changes; turbocharger lag, which was previously identified as the cause, appears to have a negligible effect.

• Supplemental Notes:
  • Also published in HS-029 192 (SAE-SP-456), "Vehicle Noise Regulation and Reduction," Warrendale, Pennsylvania, 1980 pp 1-11. Presented at SAE Congress and Exposition, Detroit, 25-29 February 1980. Research sponsored by Environmental Protection Agency.
• Corporate Authors:

  Society of Automotive Engineers (SAE)

  400 Commonwealth Drive
  Warrendale, PA  United States  15096
• Authors:
  • Crocker, M J
  • Zockel, M
  • McGary, M
  • Reinhart, T
• Publication Date: 1980

Media Info

• Features: References;
• Pagination: 12 p.

Subject/Index Terms

• TRT Terms: Diesel engines; Engines; Mechanical acceleration; Noise; Noise sources; Turbochargers
• Old TRIS Terms: Engine noise
• Subject Areas: Environment; Safety and Human Factors; Vehicles and Equipment;

Filing Info

• Accession Number: 00386639
• Record Type: Publication
• Source Agency: National Highway Traffic Safety Administration
• Report/Paper Numbers: SAE 800275, HS-029 193
• Files: HSL, USDOT
• Created Date: Jun 28 1984 12:00AM