Multi-target-proportion vehicle body vibration characteristic comprehensive test platform

A technology of comprehensive test bench and proportional car body, which is applied in the field of testing device for dynamic characteristics of high-speed train car body structure, can solve the problems of monotonous test methods, inability to comprehensively and effectively study the equivalence of structural strength and stiffness of lightweight structures, and no Seeing problems such as the test bench for the vibration characteristics of the proportional vehicle body, the effects of overcoming the test cost, small structure scale and cost reduction were achieved

Inactive Publication Date: 2014-01-22
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, most foreign proportional vehicle body vibration test benches are concentrated on subway vehicles, with simple structural design and monotonous test methods, and cannot comprehensively and effectively study the equivalence of structural strength and stiffness brought about by structural lightweight and size optimization. The ratio is also basically fixed at 1:10
There is no relevant literature on the scale car body vibration characteristic test bench in China

Method used

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  • Multi-target-proportion vehicle body vibration characteristic comprehensive test platform
  • Multi-target-proportion vehicle body vibration characteristic comprehensive test platform

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Experimental program
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Effect test

Embodiment 1

[0025] to combine figure 1 As shown, the proportioned aluminum alloy car body 1 is suspended on the end hanger 2 of the underframe 8 of the test bench through springs. The end hanger includes screw rod, long cantilever, spring seat hole, and the screw rod in the end hanger is used to adjust the height of the proportional car body and fix the proportional car body in the desired position. The height of the screw can be adjusted freely, and a long cantilever is welded on the screw to prevent the proportional car body from touching the end hanger during the test. The middle part of the long cantilever is welded with a spring seat hole, one end of the spring is fixed on the spring seat hole, and the other end is fixed on one side of the proportional car body, and the final proportional aluminum alloy car body is suspended by the spring on the end hanger on the bottom frame of the test bench.

Embodiment 2

[0027] to combine figure 2 As shown, the proportional car body is installed on the underframe of the test bench through the movable intermediate hanger 3, and the specific function is to realize two kinds of hanging support methods for the comparative car body, so as to realize the test and analysis of the torsional mode of the car body structure , and the position of the support point can be adjusted by moving the middle hanger. The scale body shown in the schematic is obtained by figure 1 Assembly is achieved by hanging the spring in it.

[0028] Different support and hanging methods are realized through the middle hanger of the test bench. Various force element sensors 6 (including displacement, acceleration, etc.), stress strain gauges 7 and signal lines for transmitting signals are installed on both sides of the proportional car body. It can realize the equivalence research of the dynamic strength and dynamic stiffness of the proportional car body structure of differe...

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Abstract

The present invention discloses a multi-target-proportion vehicle body vibration characteristic comprehensive test platform which comprises the following components: a proportion vehicle body, a computer, a data acquisition device, a power amplifier, various kinds of sensors, a test platform underframe, etc. Two ends of the test platform underframe are provided with a hoisting frame which facilitates proportion vehicle height adjustment, a middle hoisting frame which can move bidirectionally, and a plurality of vibration exciter mounting frames, thereby realizing single/multiple point excited modal test and analysis. The multi-target-proportion vehicle body vibration characteristic comprehensive test platform can realize equivalent research for dynamic strength and dynamic stiffness of proportion vehicle body structures of different rail vehicles. Furthermore through modal parameter identification technique and acquired excited and responded load time history, a structure frequency response function is acquired by means of modern digital signal processing technique, and a physical parameter model of the structure system is acquired. Furthermore load identification and sensitivity analysis are performed on the structure physical parameter for realizing identification and optimization for the structure parameter. Furthermore the test platform underframe of the invention has a small structure size and greatly reduces cost of the structure modal test.

Description

technical field [0001] The invention relates to a device for testing the dynamic characteristics of a car body structure of a high-speed train, in particular to a comprehensive test bench for the vibration characteristics of a multi-objective proportional car body. Background technique [0002] With the rapid development of high-speed railway transportation, the lightweight design of car body structure has very high requirements, which has become one of the key scientific issues facing the development of high-speed trains. However, the lightweight structure will inevitably lead to a decrease in structural strength and stiffness. It is very important to ensure the safety and durability of the structure while designing the lightweight structure. In the process of lightweight car body structure design, not only different structural material properties need to be considered, but also structural stiffness and damping characteristics caused by structural cross-sectional forms and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M17/08
Inventor 缪炳荣张卫华吴胜川梅翔张盈于金朋朱少成
Owner SOUTHWEST JIAOTONG UNIV
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