Combined thin-walled beam power absorbing method in trolley collision test

A crash test, thin-wall beam technology, applied in vehicle testing, machine/structural component testing, measuring devices, etc., can solve the problem of high initial peak value

CN101776524AInactive Publication Date: 2010-07-14INST OF FIELD OPERATION SURGERY NO 3 MILITARY MEDICL UNIV PLA
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2010-07-14
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a combined thin-walled beam power absorbing method in a trolley collision test and belongs to the field of automobile passive safety. A standard thin-walled square steel pipe is adopted; a combination mode of the length and the thickness of the thin-walled square steel pipe is regulated to form an energy absorber in the trolley collision test; and the energy absorber solves the problems of high cost, single waveform, complex operation and poor repeatability and the like existing in the conventional trolley energy absorber. In the combination mode, the action time of each group of the thin-walled square pipe is controlled by controlling the length of each group of the thin-walled square pipe, so that a peak and a valley between the groups are mutually supplemented and a smooth deceleration waveform is obtained. The combination mode of the thin-walled square pipe can be determined according to the trolley quality and the deceleration curve; the average length of the thin-walled square pipe can be determined according to a collision speed; a mounting block is arranged on the trolley, so that the thin-walled square pipe and the trolley are connected in a close fit mode; and prestrain is applied to the front end of the thin-walled square pipe, and the front end of the thin-walled square pipe is rigidly collided with a fixing wall barrier without a buffer block directly, so that the deceleration waveform meets the test requirements. The method provides a practical solution for a large amount of safety performance collision tests and biological tests of auto parts.
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Description

Technical field:

[0001] Automotive passive safety. Background technique:

[0002] The in-depth study of automobile passive safety provides a safer means of transportation for human beings. However, in the passive safety research of automobiles, a large number of trolley crash tests need to be carried out, and the energy absorbing device in the trolley crash tests plays a very important role in the trolley crash tests. Existing energy-absorbing devices include electronically controlled hydraulic energy-absorbing devices, cut-off rod hydraulic energy-absorbing devices, polyurethane energy-absorbing tubes, thin-walled beam energy-absorbing tubes, steel wire (steel plate) deformation energy-absorbing devices, etc. The cost is too high, the waveform is not easy to control, the operation is cumbersome, and the consistency is poor. Therefore, there is an urgent need for an energy-absorbing technology with low price, easy operation, easy-to-control waveform, and good repeatability...

Examples

Embodiment

[0014] Example: The mass of the trolley is 750 kg, the collision speed is 50km / h, the peak value of the deceleration required in the experiment shall not exceed 28G, the duration of the deceleration greater than 20G shall not be less than 30ms, the deceleration curve is located in a band, and the experimental temperature is 20°C. According to the requirements of the experiment, six thin-walled square tubes with lengths of 850, 780, 720, 720, 780, and 850 and a wall thickness of 1.5 mm were selected to form a combined thin-walled square tube energy-absorbing method. Put 6 thin-walled square tubes on the thin-walled square tube mounting seat of the trolley in sequence, and use a tool to bend the thin-walled square tube by 45° at the front end 20mm of each thin-walled square tube to produce pre-deformation. The traction system accelerates the trolley to 50km / h and directly hits the fixed barrier. Do not place planks or other cushioning materials on fixed barriers. The experiment...