Multiobjective Optimization of Carbon Fiber-Reinforced Plastic Composite Bumper Based on Adaptive Genetic Algorithm

Dawei Gao,Guijie Shi,Liqin Cao,Haotian Liang

doi:10.1155/2019/8948315

Abstract

Genetic algorithm (GA) is a common optimization technique that has two fatal limitations: low convergence speed and premature convergence to the local optimum. As an effective method to solve these drawbacks, an adaptive genetic algorithm (AGA) considering adaptive crossover and mutation operators is proposed in this paper. Verified by two test functions, AGA shows higher convergence speed and stronger ability to search the global optimal solutions than GA. To meet the crashworthiness and lightweight demands of automotive bumper design, CFRP material is employed in the bumper beam instead of traditional aluminum. Then, a multiobjective optimization procedure incorporating AGA and the Kriging surrogate model is developed to find the optimal stacking angle sequence of CFRP. Compared with the conventional aluminum bumper, the optimized CFRP bumper exhibits better crashworthiness and achieves 43.19% weight reduction.

Highlights

People nowadays have the increasing awareness of energy conservation and emission reduction and focus more on passive safety performance of cars in collisions. erefore, the crashworthiness and lightweight design of automobile body structure are regarded as one of the most important parts of vehicle design
Design Variables. e thickness of the bumper beam of the above model is 1.92 mm, and carbon fiber-reinforced plastic (CFRP) laminates are designed as symmetric based on the center of the laminate and composed of ten layers in total, so the thickness of each ply is 0.192 mm. en, the stacking angle of each layer is determined to be the design variables; ve independent design variables can be considered as [x1/x2/x3/
The results indicate that the crashworthiness indicators of the adaptive genetic algorithm (AGA)-optimized bumper have slightly improvement than those of Genetic algorithm (GA)

Summary

Introduction

People nowadays have the increasing awareness of energy conservation and emission reduction and focus more on passive safety performance of cars in collisions. erefore, the crashworthiness and lightweight design of automobile body structure are regarded as one of the most important parts of vehicle design. Erefore, the crashworthiness and lightweight design of automobile body structure are regarded as one of the most important parts of vehicle design. There are mainly three ways to achieve these goals: adjustment of material usage, improvement of manufacturing processes, and optimization design of vehicle structure. It is proved that the combination of material adjustment and optimized design of body structure is the most effective way to improve the crashworthiness and realize lightweight [1, 2]. Kim et al designed carbon fiber-reinforced composites and hybrid fiberglass-reinforced composite hood by finite element analysis and proved that composite hood had better performance in crashworthiness and weight reduction than traditional steel and aluminum hood [4]

Objectives

Methods

Findings

Conclusion