Safety system with closed-loop negative Poisson ratio structure, of automobile, and design method

Abstract

The invention discloses a safety system with a closed-loop negative Poisson ratio structure, of an automobile and a design method. The automobile safety system comprises a closed-loop framework structure formed by mutually and sequentially connecting the head end and the tail end of a front bumper, the head end and the tail end of a left energy absorbing box, the head end and the tail end of a rear bumper and the head end and the tail end of a right energy absorbing box; the front bumper is a front bumper crossbeam with a negative Poisson ratio structure filling core; the rear bumper is a rear bumper crossbeam with a negative Poisson ration structure filling core; the left energy absorbing box is a left energy absorbing box longitudinal beam with a negative Poisson ratio structure filling core; and the right energy absorbing box is a right energy absorbing box longitudinal beam with a negative Poisson ratio structure filling core. The design method comprises the following steps of firstly, establishing a parametric model of the bumper crossbeams and the negative Poisson ratio structure filling cores, and establishing an approximation model by combining Latin hypercube and a response surface method, and multi-objective optimization design is performed by applying multi-objective optimization algorithm in accordance with crashworthiness and light weight properties. By adopting the closed loop design and using excellent energy absorption property of the negative Poisson ratio structure, the automobile safety system disclosed by the invention can improve the energy absorbing and buffering capacity of the structure in the collision process of an automobile, enhance the protection of the automobile to occupants and pedestrians, and reduce the damage of collision to an automobile body.

Description

Technical field [0001] The invention belongs to the technical field of automobile passive safety, and specifically relates to a closed-loop negative Poisson's ratio structure automobile safety system and a design method. Background technique [0002] Improving the passive safety of a car in a frontal collision is a key link in car design. In a frontal collision of a car, a bumper system composed of a bumper and an energy-absorbing box is generally the first to participate, and in a collision between a car and a pedestrian, the bumper system directly contacts the human body, causing pedestrian injury. Therefore, the quality of the bumper system design is of great significance to the passive safety of the car and pedestrian protection. [0003] The car bumper system absorbs energy through plastic buckling during a car collision so as to alleviate the damage to the occupants, pedestrians and key parts of the car body. Traditional car bumpers and energy absorbing boxes mainly focus o...

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Problems solved by technology

[0004] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a closed-loop negative Poisson's ratio structure automobile safety system and design method, which overcomes the energy and buffer absorbed by the bumper system in the prior art during the collision of the automobile The ability is limited, and it cannot protect occupants, pedestrians and key parts of the car body well, so it can be widely used in the design of traditional and electric vehicle bumper systems

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