Optimal Design of Frame Structure of Center Axle Trailer Under Heavy Load Conditions

In recent years, the mid axle train has gradually entered the transportation market because of its large loading capacity and flexible steering. The static simulation of full load bending, full load torsion and full load braking were carried out for the upper and lower platforms of the trailer frame, and the stress and deformation were obtained. Through the topology optimization design, the pseudo density cloud image with material removal as the optimization objective was obtained. The response surface optimization method was used to adjust the main optimization parameters of the frame platform, and the sensitivity value of its influence on the strength, stiffness and mass of the lightweight frame was analyzed. Finally, the actual value of the optimization parameters was determined. The results showed that the strength, stiffness, and stability of the lightweight frame met the requirements, and the total weight loss of the lightweight frame is 437.07 kg, and the weight loss ratio reached 14.51%. Finally, the static strength test of the lightweight frame was carried out, and the results showed that the lightweight frame met the use requirements.