| 摘要 |
PURPOSE:To enable the obtaining of information on acceleration irrelevant to running speed for various abnormal points of a trolley wire, by analyzing an impact force and a vibration force working on a pantograph due to abnormal points of the trolley wire. CONSTITUTION:At a part of a trolley wire 3 has an abnormal point 3-1 and a pantograph 4 passes the point. An accelerometer 5 is mounted at a contact part 4-1 of the pantograph. The pantograph 4 advances in the direction of the arrow. The time t1 and the speed v1 are given at the start point p of the abnormal point 3-1 and change to the time t2 and the speed v2 at the end point (q) with variations in the momentum at the abnormal point 3-1. Here, supposing that the abnormal point 3-1 is short and the pantograph 4 hit it. The accompanying of a corresponding external force, namely, acceleration takes place during the period. At this point, the acceleration is proportional to the square of the running speed v. Thus, the impact on the pantograph at the abnormal point and the pattern of the vibration force can be determined correctly by dividing an output voltage of the accelerometer 5 by the square value of the speed v.
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