This paper describes the results of investigations on reduction of noise emission from an automotive diesel engine by using a noise-reducing engine enclosure. The engine enclosure was made of ordinary sheet steel. The stamped steel enclosure was fitted very close to the engine body and also supported elastically to provide isolation of engine vibration by using rubber mountings. In this research work, the technique of engine noise reduction by use of the engine enclosure and heat control problems inside the enclosure were studied, along with the following items: analysis of insertion loss of enclosure wall; influence of cooling air openings on noise reduction; relation between cooling air quantity and surface temperature of engine accessories, etc. The results of investigations on the engine test bed showed that an engine noise reduction of more than 15 db(a) can be achieved by the engine enclosure, and the temperature inside the enclosure can also be controlled within a reasonable value. The problems induced by these achievements are also described in this paper. (Author/TRRL)

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  • Corporate Authors:

    Society of Automotive Engineers of Japan

    10-2 Goban-cho, Chiyoda-ku
    Tokyo,   Japan 
  • Authors:
    • MIURA, Y
    • Arino, T
    • Kanzaki, T
  • Publication Date: 1980-11

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Filing Info

  • Accession Number: 00334145
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Report/Paper Numbers: HS-031 173
  • Files: HSL, ITRD, TRIS
  • Created Date: Aug 15 1983 12:00AM