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Wayside monitoring of the angle-of-attack of railway vehicle wheelsets

  • US 5,368,260 A
  • Filed: 11/02/1993
  • Issued: 11/29/1994
  • Est. Priority Date: 11/01/1993
  • Status: Expired due to Term
First Claim
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1. A system for installation along a rail of a railroad track for measuring an angle defined between a monitored wheel and an imaginary line tangent to the rail on which the monitored wheel travels, said system comprising:

  • a rangefinder mounted to a fixed location beside the railroad track for successively measuring at predetermined instants in time along a measurement axis a distance from the fixed location to the monitored wheel travelling on the rail, said rangefinder generating an output signal correlated to a distance between the fixed location and sites on the monitored wheel intercepting said measurement axis at respective ones of said instants in time; and

    a sensor responsive to movement of the monitored wheel on the rail for generating an output signal correlated to a change of position of the monitored wheel on the rail relative to time, whereby said signals allow computation of a value for the angle defined between the monitored wheel and the imaginary line tangent to the rail by establishing a correspondence between a variation of the distance measured along the measurement axis from the fixed location to the moving monitored wheel and the change of position of the monitored wheel on the rail.

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