Parameter Optimization of Anti-roll Bar Based on Stiffness 2020-01-0921
Anti-rolling bar is an important structural part of the automobile, which can effectively prevent the automobile from rolling and improve the safety of the vehicle during bending. In the design of the current anti-rolling bar, the stiffness of anti-rolling is determined based on experience or oversimplified mathematic model. In this paper, an anti-rolling bar is determined by 7 parameters, and forces in different directions and perpendicular to the bar are applied at both ends. The mathematical model of stiffness of anti-rolling bar is established by combining the Deformation Energy Theorem and Castigliano Theorem. Nonlinear programming and genetic algorithm are used to acquire the optimal solution and corresponding values of parameters of the mathematical model. Then, by means of partial least-squares regression method, the correlation of different parameters to the stiffness of anti-rolling bar is analyzed. Besides, the stiffness of the anti-rolling bar is calculated by finite element method. On the experimental bench, the tensile and compressive tests were carried out on the equal-scale shrinking model of the bar, which verified the correctness of the influence relationship of parameters on stiffness. The results show that the anti-rolling bar with improved structure has an 11.24% increase in stiffness compared with the original one, and it has a better effect on the prevention of automobile rolling, which significantly improves the driving safety of bending.