Measurement of Contact Wire Vibration by Anarmophic Images.

This paper describes an analysis of contact wire vibrations under pantograph passages observed by video images through an anamorphic optical lens. After processing the images obtained at Shinkansen line sides, the wire displacements of greater than 1mm over several ten meters are accurately measured. This method provides a means to get not only vibration at some discrete points but also its distribution along the wire, wihch can afford us various vibrational quantities to determine the wave propagation. In particular, the wave intensity that would closely influence the contact force is estimated from the gradient and the velocity of the contact wire. It is confirmed that the stronger waves of contact wire are generated by a pantograph in the latter half of span, wihch propagate to a pantograph that follows and coincide with it in the former half of span. The force in hanger and contact force are also estimated from the images.