Simulation And Improvement On Multi-condition Of Restraint System For A Vehicle-borne Cylindrical Container

With the continuous development of China's automobile industry and the continuous improvement of road conditions,the proportion of road transport in the freight field is increasing,and commercial vehicles play an important role in the field of road transport.Compared with passenger vehicles,commercial vehicles have huge mass and larger structure size,which generate far more energy in the event of collision and impact than passenger vehicles.Once a commercial vehicle is involved in an accident,it will cause very serious consequences in most cases,especially for some special transport items.Therefore,the study on the safety of commercial vehicles is of great significance.At present,the safety research of commercial vehicles mainly focuses on the safety performance of the cab and the vehicle structure in the process of collision.However,in some specific scenarios,the safety performance of the transported object also needs to be paid close attention to.In this paper,finite element simulation method is used to study t he mechanical response and failure of a truck-mounted cylindrical container and its restraint system under a variety of collision conditions.After that,the existing restraint system is optimized under frontal collision conditions and the performance of the constraint system is improved.Based on obtaining the 3d mathematical model of related components,the finite element modeling and pretreatment of the transporter,constraint system and cylindrical container were carried out,including meshing the 3D model,giving the characteristic parameters of each component and de fining the boundary conditions,thus the finite element model that could be simulated was obtained.The simulation results of the model are compared with the experimental data for benchmarked verification.By comparing the motion posture and acceleration data of the cylindrical box,the reliability of the finite element model is verified and can be used for simulation of other working cond itions.Seven different initial velocities were simulated for the three working conditions of frontal collision,angular collision and rear-end collision,and we evaluated the limits of existing constraint devices.Based on frontal collision,we optimized the connection mode and component structure of the existing constraint system,and verified the feasibility of optimization of the constraint system by comparing the constraint effect before and after optimization.The results show that,in the frontal collision process with initial velocity of 50km/h and below,the existing restraint system has a better restraint effect on the columnar boxes,and the columnar boxes suffer less mechanical impact.In the frontal collision condition with initial speeds of 60 km/h and 70km/h,the existing constraint system has a poor constraint effect,and the cylindrical box will have a second collision and be subjected to a large mechanical impact.The improved constraint system can prevent the column-shaped box from secondar y collision in the frontal collision condition of 70km/h,and the constraint effect is greatly enhanced.In the case of Angle collision and rear-end collision,the existing restraint system has better restraint effect on the columnar box,and the columnar box will not be subjected to severe mechanical impact.