Method development for early architectural optimization of a wheel suspension system

Oskar Eklund - ÅF Industry/Automotive Projects

CHALLENGE The purpose of motor vehicle suspension is to provide comfortable driving with minimum vibrations and noise (NVH). This presentation demonstrates the development of a CAE methodology for optimization of a rear wheel suspension system with the objectives of low weight, high cost efficiency, minimal road noise transfer, and competitive drivability and comfort. A two-phase optimization methodology is carried out, focusing on the first phase in this presentation.

SOLUTION - In the first phase, the chosen simulation model is a multi-body dynamics model (using Altair MotionSolve). The objectives are to optimize the NVH, ride and handling, performed in MotionSolve and modeFRONTIER. Afterwards, a robustness analysis is done using these two softwares followed by a space violation analysis which is a geometric analysis of solutions in MotionView or CAD tool. Max load calculation is run and a solution is selected by a comparison of attributes and loads. 

BENEFITS - The best solution is selected from the proposed optimization methodology. Each Pareto design from the ride, handling and NVH optimization is analyzed for sensitivity by varying the hardpoints within construction tolerances. Best values in optimization are found in strut & coil spring B at 80%.