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21 September 1999 Toward robust and distant estimation of the wear on a track vehicle's wheels
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Proceedings Volume 3824, Optical Measurement Systems for Industrial Inspection; (1999)
Event: Industrial Lasers and Inspection (EUROPTO Series), 1999, Munich, Germany
A serious problem for the operation of track vehicles, especially trams, is the uneven wear of the wheels caused by a discontinuous driving regime. To maintain the safety and comfort the diameter of the wheels should be closely matched. For this reason the diameter of the wheels must be periodically measured. The measurement has to be carried out automatically when the vehicle is moving slowly across the measurement system. The measurement system is based on triangulation, therefore a laser line is projected onto the wheel's rolling surface orthogonal to the axle, such that an arc of about 400 mm length is marked. The arc is registered using a medium resolution, high speed CMOS image sensor featuring high dynamic range. A two step circle approximation using the minimum squared error criterion is performed. In the first step the circle is approximated including all points of the arc. In the second step points having a larger distance from the estimated circle are discarded, then the approximation is repeated. Initial simulations and tests with a standard CCD image sensor showed a potential measurement accuracy of about 0.1 mm with common wheel diameters.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Dirk Holm and Gerd Stanke "Toward robust and distant estimation of the wear on a track vehicle's wheels", Proc. SPIE 3824, Optical Measurement Systems for Industrial Inspection, (21 September 1999);

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