A Study of Running Stability Parameters of Infrastructure Maintenance Vehicle for Commuter Rail with Scale Model
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Abstract
It is important to understand the dynamic behavior of the vehicle’s wheelset and the values used to assess its running stability when an increase in the speed of an infrastructure maintenance vehicle for commuter rail is required. This article presents a guideline for measuring the vehicle's performance, emphasizing the wheelset variables, including lateral displacement, yawing, and acceleration. This research was divided into three sections: an application of the theories related to wheelset motion, a synthesis of the standard on rolling stock equipment for shock and vibration, and an experimental result from a 1/6 scale model of the infrastructure maintenance vehicle created to mimic the behavior of the real vehicle with a maximum running speed of 60 km/hr. The study found that when using the parameters of a track gauge of 1 m and a nominal wheel radius of 380 mm, the values of wheelset lateral displacements, if running on a straight line and curve, shall not exceed 10 mm, 19 mm, respectively, and the average lateral accelerations of the bogie and the wheelset are 37, 270 m/s2, respectively. From the experimental results of the 1/6 scale model running on a roller rig at the maximum speed, it was found that the yaw angle shall not exceed 1.72 degrees, and the average lateral acceleration of the wheelset was four times higher than that of the standard value. This could be caused by the maximum running speed of the scale model at 34.9 km/hr which is much lower than that of infrastructure maintenance vehicle at 60 km/hr.
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