Test bench for research on fatigue strength and load spectrum of proportional car body under multi-point excitation loads

Abstract

The invention discloses a test bench for researching fatigue strength and load spectrum of a proportional car body under multi-point excitation load, which includes a mechanical part and an electrical part. Main controller, servo controller, etc. The proportional car body is connected to the T-slot test bench through the supporting device. The secondary spring vertical actuator is installed in the cavity of the supporting device, and the two ends of the proportional car body are respectively equipped with a longitudinal actuator and a longitudinal shock absorber. , the two sides of the proportional car body are respectively provided with transverse actuators and transverse shock absorbers. Four lower vertical actuators acting on the floor of the proportional car body are arranged on the T-slot test bench. The lower vertical actuators are located at The middle position of the bottom of the proportional car body and the top vertical actuator are arranged on the top of the proportional car body. The invention is mainly used for evaluating the fatigue strength of the aluminum alloy car body of rail transit vehicles, so as to study the fatigue damage problem of the car body.

Description

technical field [0001] The invention relates to the field of transportation equipment, in particular to a test bench for researching fatigue strength and load spectrum of a proportional car body under multi-point excitation loads. Background technique [0002] At present, light metals such as aluminum alloys are widely used in the manufacture of rail vehicles, mainly because aluminum alloy car bodies are not only light in weight and easy to recycle, but also can meet the urgent needs of lightweight car bodies. However, the lightweight aluminum alloy structure design also has some serious shortcomings, such as poor fatigue resistance, and it is easy to cause structural fatigue failure under the excitation of external random loads. At present, the strength evaluation of the car body at home and abroad is mostly carried out through the static load test. At the same time, the existing 1:1 test cost of the fatigue strength of the car body is too high, and according to the literat...

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Problems solved by technology

[0012] In the above-mentioned specifications, the strength of the car body is evaluated by the results of the static load test. Although it is simple and practical to evaluate the fatigue strength by the static load test method, some potential cracks may not be found in the static load test.

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