Automobile energy absorption box based on negative poisson ratio structure filling and multi-object optimization method thereof

Abstract

The invention discloses an automobile energy absorption box based on negative poisson ratio structure filling and a multi-object optimization method thereof. An energy absorption box body (2) is filled with negative poisson ratio filling inner cores (3) with an inner sunken hexagonal negative poisson ratio structure, wherein deformation induction grooves are designed on the energy absorption box body (2). The energy absorption box body is connected between front protection transverse beams and front longitudinal beams. Through mechanical properties uniquely owned by the negative poisson ratio structure, a stress deformation state during automobile collision is improved, and the energy absorption effect is reinforced, so that safety of passengers is improved, and maintenance cost is reduced. Meanwhile, the invention provides a multi-object optimization scheme aiming at the novel structure; through parametric modeling of the energy absorption inner cores, an energy absorption outer shell and a surrounding structure, on the basis of the Hamersley experimental design, the structure is subjected to crash simulation, a model approximating a response surface is obtained, and finally optimal design parameter combination is obtained on the basis of multi-object optimization of imperial competition algorithm; and the process can be applied to the development process of actual industrial production, reliability is improved, and the development time is reduced.

Description

technical field [0001] The invention belongs to the technical field of automobile collision safety, and in particular relates to an automobile energy-absorbing box based on negative Poisson's ratio structure filling and its multi-objective optimization design. Background technique [0002] In most traffic accidents, collisions involving the front of the vehicle are involved. When a car has a frontal collision, in order to alleviate the impact to reduce occupant injuries, and reduce the deformation of the front longitudinal beam to protect the car components and reduce maintenance costs, an energy-absorbing box is usually installed between the front bumper and the front longitudinal beam of the car. When it happens, the energy-absorbing box begins to crush and deform, absorbing most of the energy in a short time, so as to protect the safety of the occupants and reduce maintenance costs. [0003] The extent to which the crash box plays a role in a crash depends on the reasona...

AI Technical Summary

Problems solved by technology

For example, the Chinese patent CN104590178A uses foamed aluminum alloy fillers, but because of its positive Poisson's ratio structure, the full function of the energy-absorbing box cannot be brought into full play in actual collisions

[0006] In summary, the existing designs of crash boxes for automobiles have their own deficiencies, and the energy-absorbing effect is not ideal, and in the crash simulation for crash boxes There is no complete optimization design process

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