STRUCTURAL VIBRATION NOISE ABATEMENT OF A LARGE DIESEL ENGINE

This report presents a vibration-noise investigation and a redesign of the top deck and the hand hole covers of GM 645E series railroad diesel engine for reduction of vibration and radiated noise. This was achieved by incorporating in the redesigned components, isolation, stiffening and damping. For damping, the solid friction, constrained layer and viscous air damping approaches were utilized. Experimental results on vibration and noise of the original and redesigned covers were obtained. It was found that a composite design with channel stiffened constrained layer outer panel and a fiberglass filled inner cavity offered the best solution. On-engine tests at full load showed acceleration reductions of 2-40 dB for the redesigned composite top deck cover and 2-16 dB for the redesigned constrained layer hand hole cover. The composite design is recommended for both covers.

• Supplemental Notes:
  • See also PB-232 626.
• Corporate Authors:

  Illinois Institute of Technology

  Mechanical and Aerospace Engineering Department
  10 West 33rd Street, Perlstein Hall
  Chicago, IL  United States  60616

  General Motors Corporation

  Warren, MI  United States  48090

  Association of American Railroads

  50 F Street, NW
  Washington, DC  United States  20001-1564

  Federal Railroad Administration

  Office of Research and Development, 1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Varma, P K
  • Kumar, S
• Publication Date: 1976-7

Media Info

• Pagination: 100 p.

Subject/Index Terms

• TRT Terms: Acoustic measuring instruments; Acoustics; Damping (Physics); Diesel engines; Diesel locomotives; Engines; Noise; Noise control; Resonance frequency; Vibration
• Uncontrolled Terms: Noise reduction
• Old TRIS Terms: Acoustic measurement; Diesel engine noise; Engine noise; Noise sound
• Subject Areas: Environment; Railroads; Vehicles and Equipment;

Filing Info

• Accession Number: 00167115
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: FRA/ORD-76/273 Intrm Rpt., IIT-TRANS-74-1
• Contract Numbers: DOT-OS-40103
• Files: NTIS, TRIS, USDOT
• Created Date: Nov 9 1977 12:00AM