A METHOD OF ESTIMATING EXTERIOR VEHICLE NOISE TAKING INTO ACCOUNT THE REFLECTION AND DIFFRACTION EFFECT OF THE BODY AND THE ROAD SURFACE

The major noise sources of exterior vehicle noise (mainly on acceleration) are the engine, exhaust, air intake, cooling fan, and tires. The exhaust outlet, cooling fan, and tires can be considered to be simple sound or point noise sources because they are small in geometrical size. Some effect of sound reflection from the road surface, however, must be taken into account. Because of its size, the engine should be considered as a plane noise source. The effect of sound reflection from road surface, however, must be considered and also the effect of the engine being screened by side panels or engine compartment panels. In the experiments the propagation characteristics of engine noise were calculated by using a geometrical acoustic model which used noise screening devices such as body panels and engine compartment panels. The calculated results were in close agreement with the experimental results obtained from using a test vehicle. (TRRL)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/6664983
• Corporate Authors:

  Society of Automotive Engineers of Japan

  10-2 Goban-cho, Chiyoda-ku
  Tokyo,   Japan 
• Authors:
  • Shimizu, M
  • Abe, T
• Publication Date: 1980-11

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 65-72
• Serial:
  • JSAE Review
  • Issue Number: 3
  • Publisher: Society of Automotive Engineers of Japan
  • ISSN: 0389-4304
  • Serial URL: http://www.sciencedirect.com/science/journal/03894304

Subject/Index Terms

• TRT Terms: Absorption; Acceleration (Mechanics); Acoustics; Calculation; Diffraction; Engines; Exhaust pipes; Geometric design; Measurement; Motor vehicle bodies; Motor vehicles; Motors; Noise; Reflection; Rolling contact; Sound; Surface course (Pavements); Tires; Vehicles; Vibration
• Old TRIS Terms: Automobile bodies; Engine noise
• ITRD Terms: 6758: Absorption; 5405: Acceleration; 6464: Calculation; 1384: Exhaust pipe; 6136: Measurement; 1334: Motor; 6748: Sound; 1381: Tyre; 1255: Vehicle
• Subject Areas: Environment; Highways; Vehicles and Equipment;

Filing Info

• Accession Number: 00334147
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Report/Paper Numbers: HS-031 171
• Files: HSL, ITRD, TRIS
• Created Date: Aug 15 1983 12:00AM