Negative-Poisson-ratio structure type energy absorption box and multi-objective optimization method therefor

Abstract

The invention discloses a negative-Poisson-ratio structure type energy absorption box and a multi-objective optimization method therefor. The negative-Poisson-ratio structure type energy absorption box consists of an energy absorption box body (1), a front mounting plate (2), a back mounting plate (5) and a three-dimensional negative-Poisson-ratio structure type inner core (3). The three-dimensional negative-Poisson-ratio structure type inner core consists of a large amount of negative-Poisson-ratio unit cell structures, so that parameters of the negative-Poisson-ratio unit cell structures have a great influence on energy absorption performance of the energy absorption box. The invention provides the multi-objective optimization method based on the negative-Poisson-ratio structure type energy absorption box. The method comprises the steps of establishing an objective function by taking the parameters of part of the negative-Poisson-ratio unit cell structures as optimization variables; setting constraint conditions; building a negative-Poisson-ratio structure type energy absorption box optimization model; and performing multi-objective optimization on the negative-Poisson-ratio structure type energy absorption box by adopting a multi-objective particle swarm optimization algorithm.

Description

technical field [0001] The invention belongs to the field of automobile passive safety protection, and in particular relates to a negative Poisson's ratio structural energy-absorbing box and a multi-objective optimization method thereof. Background technique [0002] When a car has a frontal collision, it mainly absorbs the collision energy as much as possible through the compression deformation of the energy-absorbing box at the front of the car, reduces the acceleration generated by the collision, and reduces the maximum collision force to ease the impact, thereby reducing the collision damage to the occupants and reducing the impact. Vehicle maintenance costs. One end of the crash box is connected to the longitudinal beam, and the other end is connected to the front bumper beam of the vehicle. At present, the shape of the common energy-absorbing box is a square structure. This structure can achieve a certain energy-absorbing effect, but the deformation is not stable enou...

AI Technical Summary

Problems solved by technology

At present, the shape of the common energy-absorbing box is a square structure. This structure can achieve a certain energy-absorbing effect, but the deformation is not stable enough and the compression is not thorough enough during the collision, which leads to the inability to absorb and decompose the energy to the maximum extent, resulting in partial energy loss. Axially transmitted to the longitudinal beam connected to it, resulting in bending damage to the longitudinal beam and then causing damage to parts in the engine compartment, and even transferring energy to the passenger compartment to endanger the safety of the occupants in the car

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