INFRASOUND OCCURRED TO CENTRIFUGAL FANS USED IN SUBWAY VENTILATING EQUIPMENT, AND INFRASOUND CONTROL

The operation of forced ventilating fans for subway tunnels resulted in infrasound pollution in a densely built-up area near the ventilating tower. To find the causes of the pollution, studies were made of the noise, as well as the turbulence and fluid flow inside the suction box of the fans. It was determined that the infrasounds were caused by the rotating stall of the fans due to drift in the suction box. Changes were made to the air flow in the suction box, and the infrasound pollution was successfully eliminated, with the band sound pressure level of the infrasounds (7 Hz) reduced by as much as 27 dB.

• Supplemental Notes:
  • Proceedings of the International Conference on Noise Control Engineering, Inter-Noise 79, V2, Warsaw, Poland, September 11-13, 1979.
• Corporate Authors:

  Polish Academy of Sciences

  Institute of Fundamental Technological Research
  Swietokrzyska 21
  00-049 Warsaw,   Poland 
• Authors:
  • Ugai, Y
  • Suzuki, S
• Conference:
  • Proceedings of the International Conference on Noise Control Engineering, Inter-Noise 79, V2, Warsaw, Poland, September 11-13, 1979.
• Publication Date: 1979

Media Info

• Pagination: p. 569-572

Subject/Index Terms

• TRT Terms: Acoustic emission; Aerodynamics; Environmental quality; Fans; Infrasound; Noise; Noise control; Noise sources; Subways; Tunnels; Ventilation systems
• Old TRIS Terms: Centrifugal fans; Fan noise; Railroad transformation; Subway environment
• Subject Areas: Bridges and other structures; Environment; Public Transportation; Railroads;

Filing Info

• Accession Number: 00341562
• Record Type: Publication
• Source Agency: Engineering Index
• Report/Paper Numbers: Proceeding
• Files: TRIS
• Created Date: Oct 28 1981 12:00AM