Structural Design And Simulation Analysis Of Passenger Car Considering Suspension Constraints

With the development of national living standards,people travel more frequently,requiring higher quality of travel.The development of bearing passenger car is in line with people’s needs.This paper combines the energy,security,environment and other issues facing the world today,discussing the development course of the bearing passenger car.The body is the main bearing part of passenger car.Its performance of the structure determines the performance and service life of the vehicle directly.The static and dynamic analysis were done to ensure compliance with regulatory requirements for bus body structure.In this paper,the finite element method is used to analyze the static and dynamic performance of the vehicle body.According to the features of bus body structure and the actual stress situation of the bus structure do a proper simplification.The shell element can bus discrete choice reaction of actual stress,a finite element stress reflecting body layout model.The finite element model is established to reflect the stress distribution of the car body,which is based on the plate and shell element which can reflect the actual stress of the bus.This paper proposes the simulation method of vehicle structure including suspension system.Comparing with conventional simulation methods for vehicle structure,the new simulation method can be used to integrate the independent suspension system into the finite element model to analyze the mode of the vehicle vibration.Using conventional methods: In the calculation of the bending stiffness,the front and rear lifting lugs of the rear plate are restrained by the Z degree of freedom,so that the span between the front and rear suspension decreases,and the stiffness increases;In the conditions of reversing,due to the rigid constraints of rear suspension plate spring Z to translational degrees of freedom,the basic no longer back torque transfer,only through the rear body small deformation and some upper body involved,so where the cross.The new simulation method simplifies the analysis process,is more close to the actual motion and shortens the analysis time.According to the actual situation in the car driving,under the condition of static analysis to the body torsional bending condition and four limit,find out the weak link in the design,and compared with experimental results,provide a reference for the design of new models.Based on the theory of structural dynamics,the modal analysis is carried out,obtaining the dynamic characteristics such as frequency and mode shapes of the first 11 order modes of the bus structure under undamped free vibration.As a result,the reasonable evaluation was made.In order to verify the rationality of the finite element model,the modal test of bus body structure was carried out.Consequently,the reference is provided for further modification of the finite element model of the bus body.Based on the analysis of the dent resistance of the seven parts of the outer cover and the outer cover of the bus,obtain the loading and unloading deformation curve of the outer skin plate、load displacement curves of loading and unloading.Analysis results were studied,the dent resistance of the top cover and the two sides of the body meets the requirements of use.