| 摘要 |
<p>The 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 define two chords each extending between a pair of spaced points on the track centre line. A first measuring device is located nearer the rearward point of the first chord derives a voltage which is sampled at equal intervals, 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 servoassisted aligning mechanism.</p> |
