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ESTIMATION OF THE GEOMETRIC PARAMETERS OF A FRONT DOUBLE WISHBONE SUSPENSION BASED ON GEOMETRY FORMULATION

机译:基于几何公式的双前叉臂悬架几何参数估计

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Vehicle suspension stands out as an important subsystem, which allows vertical compliance to the wheels following an uneven road; keeps the proper steer and camber attitudes, resist roll of the chassis and provides comfort for passengers. The suspension subsystem needs to comply with stability, handling and optimum steering based on an appropriate suspension geometry. Nowadays, the use of simulation software in automotive design has increased. However, the cost and complexity of such software can make them unavailable to those working in the domain, especially the young designers working in vehicle's student competition (Baja SAE~®). Thus, this paper aims to propose a methodology for assessing a frontal Double Wishbone suspension, which is based on a set of analytical equations implemented computationally at Matlab~®. The formulae are developed considering simple concepts of algebra, trigonometry and geometry. The input data are the Cartesian coordinates (x, y, z) of predefined points, which are obtained from the CAD design and the bound/rebound travel. The main results are the simple analytical formulae, for the most important suspension's geometric parameters: caster, camber and toe angles. These analytical results are validated with MSC ADAMS~®, particularly its add-on specialized for the automotive industry ADAMS/Car~®, showing good agreement.
机译:车辆悬架是一个重要的子系统,它可以在崎an不平的道路上垂直对准车轮;保持适当的转向和外倾姿态,抵抗底盘的滚动并为乘客提供舒适感。悬架子系统需要基于适当的悬架几何形状来满足稳定性,操纵性和最佳转向的要求。如今,仿真软件在汽车设计中的使用已经增加。但是,此类软件的成本和复杂性可能使领域内的工作人员无法使用它们,尤其是在车辆学生竞赛(Baja SAE〜®)中工作的年轻设计师。因此,本文旨在提出一种评估额骨双叉骨悬架的方法,该方法基于在Matlab®上以计算方式实现的一组解析方程。公式是在考虑代数,三角学和几何学等简单概念的基础上开发的。输入数据是预定义点的笛卡尔坐标(x,y,z),这些坐标是从CAD设计和绑定/回程行程中获得的。主要结果是简单的解析公式,其中列出了最重要的悬架几何参数:脚轮,外倾角和前束角。这些分析结果已通过MSC ADAMS〜®验证,特别是针对汽车行业ADAMS / Car〜®的附加组件,具有很好的一致性。

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