ANALYSIS ON ACOUSTIC CHARACTERISTICS OF AERODYNAMIC SOUNDS FROM SURFACE IRREGULARITIES

Aerodynamic noise is generated by irregularities on the surface of a car body as well as the equipment on a car roof. This paper presents analytical results of acoustic characteristics of sounds radiating from surface irregularities and measured results of aerodynamic sounds generating from simplified irregularities on a flat surface. The analytical results show that interference occurs through reflection of dipole sounds originating from irregularities on the base plane. Such a phenomenon has been verified actually by measured data from low-noise wind tunnel tests.

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  • Corporate Authors:

    Railway Technical Research Institute

    2-8-38, Hikari-cho, Kokubunji-shi
    Tokyo 185,   Japan 
  • Authors:
    • Sagawa, A
    • Matsuo, J
    • Maebashi, E
    • Suzuki, Y
  • Publication Date: 1997

Language

  • English

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Filing Info

  • Accession Number: 00739872
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 10 1997 12:00AM