| 摘要 |
<p>A track aligning device for monitoring the curvature of a track and adjusting the track successively to correct the curvature incorporates two taut wires mounted on a car or cars running on the track, the wires each defining two chords each extending between a pair of spaced points located on the track center line. Preferably the cords overlap. Each chord operates as a reference line which cooperates with a respective measuring device. A first measuring device located nearer the rearward point of the first chord derives a voltage which is sampled at equal intervals, say 2 meters, as the aligning device passes along the track. The voltages are summed and averaged electrically and a voltage equivalent to the mean displacement of the track from the first chord is obtained. The second measuring device is located nearer the rearward point of the second chord and derives a voltage equivalent to the actual displacement at that position of the track with respect to the second chord. This voltage is compared electrically with the mean voltage and an error voltage is derived and used to operate a servo-assisted aligning mechanism to adjust the track to the left or right as necessary. In a preferred embodiment the device can also adjust the superelevation of the track to meet the necessary value as computed on the basis of track curvature and designed train speed.</p> |
