F-1122 架線・パンタグラフ間の接触力測定波形を用いたトロリ線波動伝播速度の推定(J26-1 ヘルスモニタリング(1))(J26 機械・構造物のヘルスモニタリング)

Abstract

The wave propagation velocity of contact wire is an important parameter to attain good current collecting performance of overhead catenary system. The authors propose a new method to estimate this parameter based on the measurement of contact force between pantograph and contact wire. The Contact force fluctuation caused by a dip of the contact wire between hangers generates a wave on contact wire. The wave reflects at the nearest hanger, then returns to the pantograph again. This incident wave makes the contact force which fluctuates at a frequency modulated by the Doppler effect. The modulation is mainly governed by the ratio of train speed and wave propagation velocity. Therefore, the wave propagation velocity can be estimated by detecting the frequency modulation. To validate this method, we perform estimation by the measured contact force on a Shinkansen train. A comparison between this result and a directly measured result on the contact wire shows that the error of this method is less than 10%.