Optimization Design On Parameters Of Torsion Beam Cross Section Of A Rear Suspension

With the environmental pollution and intensified energy crisis more and more serious, energy conservation and emissions reduction become the focus of automobile designers. Lightweight technology not only improves the fuel economy, but also reduces harmful gas emissions to achieve the goal of energy conservation and emission reduction. So the lightweight technology is widely used in automobile product design.As the main part of a torsion beam rear suspension, torsion beam has a direct effect on the performance of the suspension, and the torsion beam is accounted for 50% of the total suspension weight. Under meeting the suspension performance, its structural optimization is one important way to achieve the purpose of lightening a suspension weight. So this paper takes the torsion beam as the research object, and its structure is optimized.Firstly, a three-dimensional model of the original torsion beam rear suspension is imported into Hyper Mesh, and a finite element model of the torsion beam and parts that are related to suspension is established. Then this paper makes static analysis and modal analysis, which provide a reference for the following lightweight design.Secondly, taking into account the torsion beam structure is mainly influenced by material thickness and cross-sectional shape. The uniform test method and response surface methodology are used to optimize its structure. The evaluation index after optimization should keep consistent with the before. At last, the weight reduction of the optimized torsion beam is about 13.87 %., and the torsion stiffness is reduced by 7%.Finally,using the software ADAMS, two kinematics models of the torsion beam rear suspension is set up. One is before optimization, and the other is optimized. During opposite wheel travel, a wheel is upward and a wheel is downward. Because torsion stiffness has a great effect on the wheel alignment parameters and the height of roll center. The opposite wheel travel is used to better investigate this effect. Then the lightweight design for torsion beam is proved to meet the request of the suspension.