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

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.

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...

AI Technical Summary

Problems solved by technology

Existing thin-walled beam energy-absorbing tubes all use a single group of the same length. In the collision test, the deceleration waveform has large peaks and troughs, especially the initial peak value is high, which is difficult to meet the needs of the collision test.

The deceleration waveform has been improved by adding induction grooves on the thin-walled beam and carefully designing the solder joint position of the thin-walled beam, but the problem cannot be solved fundamentally.

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