WHEEL/RAIL NOISE - PART 1: CHARACTERIZATION OF THE WHEEL/RAIL DYNAMIC SYSTEM

Field and laboratory measurements of the point impedance, response, radiation efficiency, and directivity of rapid transit steel wheels and rails are presented and compared with appropriate analytical models. The rail impedance can be well modeled by the impedance of an infinitely long beam with the same bending stiffness. Measurements of the wheel impedance in the radial direction are closely approximated (up to about 1000 hz) by the impedance of a mass equivalent to that of the wheel plus one-third of the axle mass. Above 100 hz, the wheel impedance is approximated by the impedance of an infinite beam with the same cross-section as the wheel tread without the web. At low frequencies (below 1000 hz), the decay of vibration along the length of a rail away from the point of excitation is rapid enough so that most rail vibration occurs within a few feet of the exciting wheel. Measurements of the wheel radiation efficiency agree with predictions that are based on the radiation efficiency of a rigid disk with the same radius vibrating in the axial direction. The directivity of radiation from the wheel and rail is approximately uniform. /TRRL/

  • Availability:
  • Corporate Authors:

    Academic Press Incorporated

    Berkeley Square House, Berkeley Square
    London W1,   England 
  • Authors:
    • REMINGTON, P J
  • Publication Date: 1976-6-8

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Filing Info

  • Accession Number: 00141502
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Nov 3 1982 12:00AM