Abstract
A train end relationship test system was installed with a Stewart parallel robot on the reaction bases perpendicular to the ground, to test the fatigue and durability of train end relationship components, such as the transfixion way of a high-speed railway train. The flexibility of the reaction bases affected the test accuracy of the train end relationship components within a test frequency band range. In this paper, a coupling characteristic model was established between the flexible bases and the parallel robot. Then, the analytical relationship was analyzed between the natural frequency of the bases and the natural frequency of the parallel robot. Moreover, a design criterion was proposed for the natural frequency of the reaction bases. It was considered that when the natural frequency of the bases was not less than five times the natural frequency of the parallel robot, the influence of the flexibility of the bases on the test accuracy can be ignored. The validity of the design criterion was verified by the simulation results.
Highlights
With the rapid development of railway transportation, speed and load carrying capacity has improved significantly during the past few decades
Zhang [5] analyzed the dynamic interaction between train and track, the pantograph–catenary system, the power supply system, and the airflow of high-speed railway systems
With a self-designed Stewart parallel robot, the test accurately reproduced the boundary conditions of train end displacement, and velocity and force, and simulated the motion characteristics of a high-speed railway train under complex line conditions, i.e., curves and turnouts, and researched the strength, stiffness, fatigue durability and reliability of the train end components, such as the transfixion way and jumper cable
Summary
With the rapid development of railway transportation, speed and load carrying capacity has improved significantly during the past few decades. With a self-designed Stewart parallel robot, the test accurately reproduced the boundary conditions of train end displacement, and velocity and force, and simulated the motion characteristics of a high-speed railway train under complex line conditions, i.e., curves and turnouts, and researched the strength, stiffness, fatigue durability and reliability of the train end components, such as the transfixion way and jumper cable. The coupling characteristics between the six-degree-of-freedom flexible bases and the parallel robot, and their influence on the performance of the comprehensive test system for the train end relationship, were studied, and a design criterion for the natural frequency of the flexible reaction bases was proposed that satisfied the train end relationship test accuracy
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