Inspection method of railway track irregularities by acceleration, and result of test on conventional line

Abstract

This paper deals with inspection method of railway track irregularities by acceleration. These irregularities are inspected by a track inspection car. There are two methods for inspection of track vertical or horizontal irregularities, they are the differential method and the inertial measuring method. Track irregularities inspection method now in use is the mid-chord offset method on inspection car of conventional lines. The inertial measuring method is rare for practical use, because it has demerit with output wave distortion. In this paper, the inspection method is suggested without this demerit, that is directly obtained mid-chord offset irregularities from acceleration. From the result of test on conventional line, we obtain as follows: (1) Characteristics of midchord offset method and inertial measuring method are analyzed and problems in those method are clarified . (2) We propose new inertial inspection method with characteristic of mid-chord offset method. (3) The precision of this inspection method is 0.5mm and the difference between this inspection method and convention mid-chord offset method is 0.7mm.