定置カメラを使用した軸はりゴムの異常診断

抄録

In Japan, the working-age population will roughly halve by 2060 from its peak in the late 1990s. Therefore, significant labor saving is required to maintain quality in the railway business at its current level. One such approach is the trend toward introducing vehicle monitoring devices which can automatically monitor the condition of the vehicle and facilitate efficient maintenance. However, there is no equipment for conducting a non-dismantling functional inspection on the stiffness of critical bogie rubber components subjected to forces of several kilonewtons or more, so we decided to develop such equipment. The equipment monitors the status of the bogie by using a wayside high-speed camera to measure the vibration of the bogie when it passes over iron plates approximately 5 mm thick placed on the track. This report outlines the diagnostic method, demonstrates the accuracy of vibration measurement from camera images, and presents the results of a rubber stiffness evaluation test, where axle beams with different rubber stiffness values due to the status of cracks were attached to an actual vehicle. The axle beam, which has a rubber portion at the end, supports the axle box mainly in the longitudinal direction. In addition, by creating a numerical model for quantitative evaluation and assigning a suitable stiffness value to the replacement component, we show that the model gives the same results as the test and that the longitudinal stiffness of the axle beam can be evaluated quantitatively by a wayside camera.