Study On Lightweight Of FSEC Racing Car Frame Based On Hyperworks

As the main structure of the vehicle body and other auxiliary assembly load,the performance of the frame directly affects the performance of the vehicle.The frame of the pure electric equation racing car of Xihua University is mainly carried on the load produced by the power system,the transmission system and the self weight of the driver,and the force and torque produced in various working conditions.The lightweight design of the frame is achieved under the premise of meeting the stiffness performance of the frame and avoiding the resonance between the frame and other systems.Based on the rules of 2017 formula formula racing competition,the following studies are carried out in this paper.(1)The determination of the structure,material and welding procedure of the frame.Through the comparison of the frame structure of some formula student racing cars,the suitable structure form is selected,and the more suitable materials are selected through comparing the performance of several commonly used materials.Based on the design rules and the principle of ergonomics,the geometric model of the frame is established in the three-dimensional software CATIA.(2)The finite element model of the frame is established by using software Hypermesh,and the static simulation analysis is carried out on five working conditions of full load bending,full load torsion,high speed turning,emergency braking and linear acceleration.And in the field,the tests of circle the loop in figure 8,emergency braking and 75 meter linear acceleration are compared with the static simulation analysis of the frame.The simulation results are verified,the strength and stiffness of the frame are checked,and the strength and stiffness of the frame can be determined to meet the safety requirements.(3)Using the established finite element model and Optistruct solver to carry out free modal analysis,the first seven order modal frequencies and vibration modes are extracted.The free modal test is carried out on the frame,and the first seven order modal frequencies and vibration modes and simulation results are compared,and the authenticity of the simulation results is verified by comparison.In oder to prevent the racing car from resonating during driving,and the first seven modal frequencies of the frame are compared with the related excitation source.(4)Local topology optimization and size optimization of the frame are designed to optimize the structure of the frame.The weight of the frame is reduced to 27.3kg from the original 34 kg,and the weight of the frame is reduced by 19.7% to achieve the goal of lightweighting.The optimized frame is simulated and analyzed and compared with the related performance of the original frame.It is concluded that the performance after optimization is basically better than that of the original frame.