Frontal Collision Performance Optimization Research Of Commercial Vehicle Cab

At present,the domestic commercial vehicle cab is basically dominated by a flatheaded cab.Its structural characteristics determine the lack of collision buffers in the front of the car.At the same time,the commercial vehicle is of high quality.In the event of a traffic accident,the cab body will suffer too much The impact load produces large deformation,resulting in serious casualties and economic losses.Therefore,it is particularly important to carry out simulation analysis of the collision safety of the cab,analyze and evaluate its collision performance,and then improve and optimize the main structures and parts of energy absorption.With the increasing emphasis on lightweighting,while ensuring the passive safety of the cab,it effectively reduces the total quality of the cab,uses multiobjective optimization theory and methods to solve practical engineering problems,and effectively improves the performance of the cab in all aspects.Based on the ECE R29-03 regulations,this paper establishes a finite element model of the entire vehicle of the cab and performs simulation analysis,extracts performance indicators that characterize the crash safety of the cab,verifies the effectiveness of the built model through the energy change curve,and discusses the collision process The deformation and energy absorption characteristics of the entire vehicle and components were confirmed by introducing the 50 th percentile male dummy model.The occupant’s living space during the collision process did not meet the requirements,and the cab needs to be improved and optimized.Based on the structural characteristics of floor longitudinal beams,the cross-sectional characteristics of S-shaped thin-walled beams,the influence of key parameters such as the position and size of the reinforcement on its crashworthiness were studied,and it was found that the introduction of left diagonal reinforcing ribs inside the S-shaped thin-walled beams caused lateral crushing.Improvement,anti-collision performance is significantly improved,comprehensive lightweight requirements,using NSGA Ⅱ algorithm for multi-objective optimization design,to provide a reference for the longitudinal beam structure improvement and vehicle optimization.Based on the contribution analysis theory and the results of the cab energy absorption analysis,the key thickness variables were selected as multi-objective optimization design variables.Considering that the frontal collision of the cab did not meet the requirements,based on the research of S-beams with reinforcement,Give priority to the improved design of the floor stringers.Based on the improved model,the optimal Latin hypercube test design method is used on the premise that the shortest distance between the steering wheel and the dummy’s chest in the x-axis direction can provide sufficient occupant survival space.Select sample points and establish corresponding agent models for multi-objective optimization.After optimization,the total mass of the components is reduced by 3.72%,the total energy absorption is increased by 1.16%,the acceleration of the B-pillar is reduced by 1.9%,and the safety performance of the front collision of the cab is significantly improved.The result has certain reference value for the optimization of the frontal collision safety performance of the commercial vehicle cab..