Static Analysis Of Carrier Body Structure

With the rapid development of computer hardware and software and increasingly mature of numerical calculation methods,the application of finite element method in the field of automotive research has becoming more and more widely.However,by querying the relevant literature,at present,the research method of body strength and rigidity is still relatively backward.Therefore,this subject used a certain type of load-bearing sheet metal bus as the main body,take a comprehensive exposition about a new idea’s application in Static Simulation Analysis and Optimization of Vehicle Body StructureAt present,most of the static analysis of the body structure using inertial release method,the definition of inertial release refers to the use of structural inertial force to balance the external force.The process is relatively cumbersome,need to specify a specific condition,and obtain support force of chassis system in the multi-body dynamics software such as Adams.Then,take it as the boundary conditions of the structure in the finite element software and use the inertial release method for calculation.This method is limited,at first,the workload will increase with the increase in working conditions,and by two stages in the analysis process will cause errors.Finally,it completely ignored the suspension system deformation on the body structure of the impact.The reason why the use of inertial release method,on the one hand is the theoretical limitations,on the other hand is the lack of understanding of the suspension system modeling.Therefore,in order to get more efficient and accurate simulation of the body structure of the stress and strain situation,and to avoid the cumulative error caused by the results of distortion.This subject presents and uses the static analysis of the body structure including the suspension system by MPC technology.Combined with finite element analysis software Hyperworks,in this paper,the simulation of the eight working conditions is carried out,it contain bending conditions,left front to reverse the working conditions,the right front to reverse the working conditions,the left rear to reverse the working conditions,the right rear to reverse the working conditions,limit braking conditions,limit steering conditions,in the result analysis,the strength of the body structure is checked according to the stress distribution and the evaluation criterion of the structure,and the reasonable improvement scheme is put forward for the high stress area.Such as torsion spring mounts,leaf spring mounts and other design unreasonable areas,through the three-dimensional software design improvements.And then take the analysis and calculation for the structure,until the structural strength to meet the design requirements.At the same time,this subject also analyze and verify the stiffness of the vehicle body,and found: The body deformation resistance of the body is good,the deformation of the body opening parts and the deflection of the frame are within the acceptable range of deformation,combined with the relevant data on the vehicle,it can determine that the structural stiffness meet the design requirements.In the modal analysis,this paper carries on the constraint modal analysis of the vehicle body including the suspension system.Compared with the traditional body free mode analysis,the model of constrained modal analysis is more complicated.By adding an external load and complex movement suspension system,making the load boundary conditions more in line with the actual situation,and can better reflect the vehicle structure in the actual operation of the vibration characteristics.