The Research On Lightweight Of Coach Body Based On Collision Safety

The construction and development of the "convenient,rapid,green,and safe" urban public transport system has become an important way to solve the urban traffic problems and air pollution problems.The maintenance of large buses as the main urban public transport vehicle has grown rapidly.However,due to the large passenger capacity of buses,once an accident occurs,it can easily lead to group casualties.In addition,the lightweight design of vehicles for passenger cars contributes to energy conservation and environmental protection.This paper focuses on the collision safety and lightweight design of a 6100 semi-loaded passenger car body frame.The research contents mainly include the establishment of a side impact finite element model,safety analysis of side impact,and lightweight design of the car body skeleton.The purpose is to ensure The safety of passenger cars is accompanied by a lightweight body frame.First,a 3D solid model of a 6100 passenger car was built using CATIA software.The model was preprocessed with HyperMesh software,and the existing ECE R95 moving barrier was adjusted for weight and position,and the collision simulation parameters were set up.Passenger car side impact finite element model.Secondly,the LS-D YNA software was used to calculate the impact of the moving barrier on the left and right side impacts of the passenger car at 30km/h,40km/h and 50km/h respectively.The rationality of the simulation results was verified by the energy conservation angle,and the structure of the bus was analyzed.Deformation and occupant safety.The results show that the passenger side has a certain strength,structural deformation is reasonable,the maximum pillar displacement is 52.4mm,passenger seat pelvis and headrest acceleration,living space invasion and other indicators are within the allowable range of regulations,passenger side safety is good It is reasonable to use 50km/h as the initial voelcity of the side impact of a passenger car.Then,check the structural strength of the passenger car under bending and torsion conditions,grasp the bearing characteristics of the passenger car structure,and combine the passenger car side collision results to develop a lightweight design for the passenger car,including the optimization of the structure of the roof,left and right side walls and frame structure.The topology optimization determines the specific optimization area of the frame,and the specific thickness of the component is determined by using the size optimization.The final weight loss is 109 kg,and the weight of the entire vehicle is reduced by 7.4%.Finally,the lightweight body was evaluated,and the impact safety,structural structural strength,and modal dynamic characteristics of the front and rear body frames were compared and analyzed.Lightweight body frame crash safety is improved,the performance of the skeletal structure meets the requirements of working conditions,the vibration mode of the vehicle body avoids the resonance range,and the lightweight design scheme is relatively reasonable.This study provides corresponding theoretical support and practical basis for the formulation of the side collisions of passenger cars in China and the development of high safety passenger car products,and has good engineering application value.