Structural Topology Optimization of Multilink Suspension System Using ATOM

A multilink suspension offers a good balance between ride and handling performance and packaging space efficiency. It is also complex in design due to changes in link loading and compliance at high articulation travel. Therefore, geometric and material non-linearity behaviors are important to consider when designing these types of suspension components. Structural topology optimization has been applied in linear structural design for many years. It is a proven method for developing concept designs to meet design requirements. However, most techniques of this type in use do not comprehend geometric and material nonlinearities. This may lead to suboptimal designs for components where these effects are important, such as multilink suspensions. GM Chassis CAE has used Abaqus for many years. We have been exploring new simulationbased design methods to reduce development time and provide mass-efficient vehicles to our customers. ATOM is one tool that offers the ability to optimize our designs while comprehending material and geometric nonlinearities. This study is an example of our recent efforts. First, this study demonstrates a simulation of an integrated multilink suspension system model in Abaqus. This model includes both finite element models of the links as well as connector elements. Next, the model is assessed in Abaqus to determine the suspension strength and fatigue life of each individual link. Finally, topological design optimization is executed for this multilink suspension model using ATOM to determine the critical load path, alternative concept designs, and locations for mass reduction in order to meet the performance requirements.