Test method by loading alternating aerodynamic load outside train body of high-speed train

An aerodynamic load, high-speed train technology, applied in the direction of applying stable tension/pressure to test material strength, using liquid/vacuum for liquid tightness measurement, etc. issues of science, waste of resources and energy

Active Publication Date: 2011-03-02
CENT SOUTH UNIV
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  • Abstract
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AI Technical Summary

Problems solved by technology

However, the current strength test of the car body basically adopts the static loading method with a safety factor, which is obviously unscientific
[0003] Its shortcomings: the coefficient is set large, the body

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0025] Take the test of alternating aerodynamic load on the model CRH2 car body as an example. The overall dimensions of the car body are 24.5 meters in length, 3.38 meters in width, and 3.7 meters in height. The peak value of the alternating aerodynamic load is 4,000 Pa, and the number of alternating cycles is 100,000.

[0026] In this embodiment, the gap between the inner cavity of the sealed container of the load loading device and the outer wall of the vehicle under test is provided for manual inspection in the middle of the test, the gap in the vertical direction is not less than 1.5 meters, and the sum of the gaps in the transverse and longitudinal directions is not less than 3 meters .

[0027] The detection sensors are installed on the test vehicle body, and the mature existing technology is used for pasting installation, including 80 strain sensors, 10 displacement sensors, and 3 pressure sensors. All installed detection sensors are connected to the computer system. ...

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Abstract

The invention relates to a test method by loading an alternating aerodynamic load outside train body of a high-speed train. The method adopts a load loading device to perform loading and unloading to the train body to be tested, wherein a detection sensor is arranged on the train body to be tested; the detection sensor and the control system of the load loading device are electrically connected with a computer system; the load loading device is controlled by the computer system to perform automatic loading and unloading to the train body to be tested repeatedly according to the preset working conditions and cycle number; the computer system collects test data instantly through the detection sensor and stores the test data; and after the detection sensor is installed on the train body to be tested, the train body to be tested performs sealing treatment; when the demand of the sealing detection is met, the train body to be tested is placed in the sealing container of the load loading device; the pressure in the train body to be tested is equal to one atmospheric pressure before the test; and the alternating aerodynamic load generated by the load loading device is directly loaded on the outer surface of the train body to be tested. A gap through which a worker enters to detect during the test is left between the cavity of the sealing container of the load loading device and the outer wall of the train body to be tested.

Description

technical field [0001] The invention relates to a test method, in particular to a test method for testing the degree of influence of alternating aerodynamic loads on the strength and stiffness of a high-speed train car body with alternating aerodynamic loads applied to the outside of a high-speed train car body. Background technique [0002] With the promotion and popularization of high-speed trains in our country, the impact of strong airflow outside on the car body of high-speed trains is increasing. However, the current strength test of the car body basically adopts the static loading method with a safety factor, which is obviously unscientific. [0003] Its weak point: the fixed coefficient is big, and the car body is made bulky, increases the self-weight of car body, wastes resource and energy. If the coefficient is set low, the strength and rigidity of the car body are difficult to meet the requirements of high-speed safe driving. Contents of the invention [0004]...

Claims

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Application Information

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IPC IPC(8): G01N3/08G01M3/02
Inventor 高广军许平姚松鲁寨军姚曙光周丹熊小慧周伟
Owner CENT SOUTH UNIV
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