FUTURE PROJECTED VEHICLE SOURCE NOISE EMISSION LEVELS FOR USE IN HIGHWAY TRAFFIC NOISE PREDICTION CALCULATIONS

The importance is stressed of realistic source emission levels inserted into the mathematical models to produce results that will correlate with measured levels, and information is presented that was the basis of two documents developed in response to the EPA Proposed Rule Making for Noise Emission Standards for New Medium and Heavy Trucks. Traffic flow rate and mix, as well as vehicle source noise levels that are respresentative of the specific mode of operation must be indicated in a model. For trucks, each speed and acceleration condition will necessitate a separate consideration of powerplant related noise and tire-road surface interaction noise. A single level number can only be used to represent a class of vehicles if that number takes into account the specific conditions of engine operation and speed. The potential benefit of regulating new trucks will not be realized without an effective enforcement program to eliminate poorly maintained and modified vehicles that produce excessive noise. Calculations are described which have been performed on 2 models that illustrate the urban freeway cruise situations with vehicles travelling at 55 mph, and the urban street cruise condition with vehicles travelling at 35 mph.

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 73-76
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00131403
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: May 14 1976 12:00AM