A method for measuring intrusion amount of b-pillar impact test

Abstract

The invention belongs to the technical field of automobile component test equipment, and specifically relates to a measuring method of the invasion amount of a collision test of a B-pillar. The methodincludes steps: installing the B-pillar on a positioning rack, wherein the B-pillar arranged on the positioning rack has an installation form on an automobile; installing more than one laser displacement sensor on the positioning rack in sequence along the vertical direction from top to bottom, wherein the laser displacement sensors correspond to measuring points on the B-pillar; colliding with the B-pillar with a set collision speed, and acquiring data by the laser displacement sensors; after finishing the collision of the B-pillar, stopping acquisition and outputting the data by the laser displacement sensors; and drawing a displacement change curve of a test point of the B-pillar according to the outputted data, and obtaining the invasion amount of the test point of the B-pillar according to the displacement change curve of the test point of the B-pillar. According to the method, the test data is accurate and comprehensive.

Description

technical field [0001] The invention belongs to the technical field of auto parts test equipment, and in particular relates to a method for measuring the intrusion amount of a B-pillar collision test. Background technique [0002] According to statistics, about 1 / 3 of all kinds of traffic accidents in our country are caused by side collisions of automobiles. The fatality rate of side collision is second only to frontal collision, and the injury rate ranks first. Automobile side collision regulations are one of the main collision regulations of automobiles, which are involved in the mandatory automobile regulations and star evaluation standards of various countries. In the side collision of a car, the B-pillar is the most important deformation and force transmission component in the side collision. Therefore, the stiffness and strength of the B-pillar are directly related to the side impact performance of the vehicle. Crash test is the most intuitive and simple method to e...

AI Technical Summary

Problems solved by technology

[0005] Since the B-pillar is generally made of high-strength steel, the B-pillar will generally rebound quickly when it is impacted. If the deformation value obtained by comparing the shape of the B-pillar before and after the collision is used as the intrusion value, it is not accurate because the rebound is not considered.

[0006] In addition, due to the shape characteristics of the B-pillar, the convex surface on the outside of the B-pillar will be deformed in contact with the collision object. Therefore, if a high-speed camera is used for shooting calculations, part of the structure on the B-pillar will be blocked by the outer surface of the B-pillar during the deformation process. The deformation process of some covered structures in the B-pillar cannot be photographed, that is, the high-speed camera method also cannot obtain the amount of intrusion when the B-pillar collides

[0007] In addition, during the B-pillar crash test, acceleration sensors are arranged on the B-pillar and the trolley, and the displacement curve can also be obtained by quadratic integration of the acceleration curve, but in the actual test process, the obtained acceleration curve has more noise points, and the curve The fluctuation of the displacement curve is very large, and the error of the displacement curve obtained after the second integration will be larger. Therefore, the intrusion amount obtained by the second integration method is not accurate, and even the error is extremely large.

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