Research On Lightweight Of Electric Cleaning Car Frame Considering Collision Load

The electric cleaning vehicle has an extensive application in many green spaces of the city,but the specific energy of on-board battery has a low yield of energy,therefore the study of weight-reduction research of electric car is necessary.The vehicle frame is the key part of the electric vehicle,the vehicle frame structure directly influenced the car’s performance.In order to improve the static and dynamic performance of the electric vehicle frame,the topology optimization and finite element method are applied to the study of the frame mechanical performance.Firstly, the collision load is applied to the multi-objective topology optimization for the vehicle frame and we get the optimal material distribution of the cleaning vehicle frame.Then the improved frame model is established in CATIA and the mass of the frame is reduced by 3.3%.Lastly,the static analysis,modal analysis and front crashworthiness of the before and after frame are simulated.Comparing with the results,we find that the frame strength and previous five natural frequency are property improved.We also find the bending stiffness and torsional stiffness are increased by 9.96% and 10.37%,the cab deformation in the frontal impact is reduced by 12.76 mm. Ultimately,we get that the multi-objective topology optimization is verified and feasible.Considering the most dangerous load case in the static analysis,CATIA and ABAQUS are integrated in Isight.By taking three kinds of rectangular tube sectional dimensions as design variables,the lightweight research of the improved frame is carried out based on the combinatorial optimization algorithm.After 526 ASA iterations and 104 NLPQL optimal iterations,the calculation converges.According to the steel section standard, we get the optimized frame weight is 240.402 kg which is a 11.99% decrease compared with the weight before optimization 273.153 kg. The maximum mises stress of the optimized frame is 163.8Mpa and it meets the strength requirement and the cab deformation in the frontal impact is reduced by 7.08 mm. The study realizes the goal of the frame lightweight while improves the crashworthiness of the electric cleaning vehicle.The multi-objective topology optimization for the vehicle frame based on the collision load has important reference value for the crashworthiness research of the frame.With the help of integrated optimal design in Isight,the ability of CATIA and ABAQUS software is ful y used.Simultaneously,with the application of the combinatorial optimization algorithm, optimized efficiency and accuracy are increased significantly.The whole study not only enriches the frame design optimization method, but also has important guiding meaning to the light-weight research of the vehicle frame.