Train body chassis fatigue strength test bed and testing method

Abstract

The invention discloses a train body chassis fatigue strength test bed and a testing method. The test bed comprises a train body chassis (1) for the testing and an actuator (2) used for fixing the two ends of the chassis (1), wherein the other end of the actuator (2) is fixed on a counter-force base (3); the counter-force base (3) is fixed on the end part of a basin-shaped foundation (4); the chassis (1) is placed on a support device (5); the support device (5) is fixed on the two sides of the basin-shaped foundation (4); a six-freedom vibration excitation device (6) is arranged inside the basin-shaped foundation (4); a vertical loading device (7) and a dragging device (8) are fixed on the upper part of the six-freedom vibration excitation device (6); the other ends of both the vertical loading device (7) and the dragging device (8) are respectively connected with the chassis (1). The test bed can finish the fatigue strength test of one train body chassis or the fatigue strength test of two train body chassis, and is low in test cost, high in test efficiency, and more real and more reliable in test result.

Description

technical field [0001] The invention belongs to the technical field of railway transportation, and in particular relates to a fatigue strength test bench and a test method of a train body underframe. Background technique [0002] Since my country implemented the sixth major railway speed increase in 2007, from the CRH EMU with a speed of 200 kilometers per hour at the beginning to the CRH380 with a speed of 380 kilometers per hour, the high-speed train has continuously refreshed the test and actual conditions in less than 7 years. Operating speed records. However, while the speed and other indicators are rapidly improving, the safety and reliability problems brought about are lack of research. [0003] Due to its high-speed, heavy-duty and lightweight development direction, high-speed trains generally use aluminum alloy welded structures. Aluminum alloy high-speed trains have been localized from the manufacturing of materials to the subsequent welding and assembly processes...

AI Technical Summary

Problems solved by technology

[0004] Existing fatigue strength tests of the underframe of the car body are carried out on the strength test bench or the static strength test bench of the car body through hydraulic actuators, and there is no special test bench

And during the test, only the force loading can be carried out on the underframe of the car body, and the vibration loading cannot be carried out.

Therefore, the current strength test bench cannot truly simulate the fatigue strength test of the car body chassis, and is affected by various hardware facilities

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