Methodology for the Design of a Double-Wishbone Suspension System by Means of Target Cascading: Problem Statement 2013-01-0973
The target cascading methodology allows dealing with multi-domain coupled design problems. With this methodology, a complex design and optimization problem is decomposed into reduced-order problems in an ordered hierarchical structure, without losing the information about the coupling interactions between them. The order-reduction and partition of the original design problem not only bring computational advantages in the solution process, but also permit the designer to have a deeper insight of the problem nature.
This work is centered in the geometric problem related to the design and optimization of a double-wishbone suspension system of an off-road vehicle. Given the nature of this problem, the target cascading methodology is proposed as an efficient solution approach. This methodology recognizes that the suspension system plays an important role in the interactions at different levels of the design problem including system dynamic response and systems physical interactions.
Two types of hierarchies are considered in parallel, a system-type hierarchical decomposition of the overall vehicle problem and a discipline-type decomposition of the suspension kinematic and dynamic problem. Four levels are proposed for the system-type hierarchical partition: a super-system at the top level, two system design levels at the second and third levels, and a components level at the fourth level. Four analysis models of the suspension problem are proposed: suspension kinematics and longitudinal, lateral and vertical dynamics models.
The general hierarchical design scheme is presented. As the solution methodology depends strongly on the variable definition, a suitable set of geometric design variables that fully describe the suspension configuration is proposed.