Co-optimization Of The Material/structure Of The FRP Automobile Anti-collision Beam

Passive safety,as an important factor affecting the improvement of automobile safety performance,has always been a hot research topic at home and abroad.It plays a vital role in the sustainable development of automobile industry.automobile anti-collision beams is the first part of automobile body collision.The research on lightweight and crashworthiness of automobile anti-collision beam is very important.Lightweight materials are one of the important ways to achieve lightweight of automobiles.Fiber reinforced composites,as a new type of materials,have been widely used in aerospace,vehicle engineering and other fields because of their excellent properties such as high specific strength,high specific modulus and low density.In this paper,the automobile anti-collision beam is taken as the research object.The basic mechanics of composite material,the theory of collision simulation analysis and the optimization design method of composite material are taken as the theory.The secondary development is realized by using the combination of MATLAB software and Ansys software.Based on the domestic GB17354-1998 low-speed collision standard,the carbon fiber resinbased material(T300/Y)is developed.PH209)is applied to the structural design of anticollision beams.(1)According to the existing genetic algorithm theory,an improved adaptive genetic algorithm adjustment formula is proposed.Considering the relationship between fitness mean and individual fitness in parent population,the relationship between iteration times and maximum crossover and maximum mutation probability.The improved adaptive algorithm is combined with two-dimensional Rasrtigrin test function.Genetic algorithm is used for performance testing.(2)A two-scale collaborative optimization method for the structure/material of the anticollision beam is proposed based on the prototype of a composite vehicle anti-collision beam.The optimization analysis of the anti-collision beam under uniform load is simulated.The simulation results show that the strength ratio of the anti-collision beam increases by 81.41% and the maximum Von Mises stress decreases by 56.4% after the co-optimization,while meeting the lamination criterion and material strength.The result of optimization achieves the expected effect.The proposed optimization method solves the problem that the traditional optimization only considers a single level,which leads to the optimization result is not the optimal solution of the whole design space.(3)According to the domestic GB17354-1998 collision standard,the finite element analysis of the anti-collision beam under the condition of low-speed collision is carried out.The structural and material parameters of the anti-collision beam are taken as design variables,the maximum cross-section force,the maximum deceleration of collision and the quality of the anti-collision beam are taken as constraints.The single-objective collision performance is established with the maximum energy absorption as the optimization objective.The optimization problem is solved by the improved adaptive genetic algorithm,and the optimal design scheme in the whole design space is obtained.