Optimisation of Double Wishbone Suspension System Using Multi-Objective Genetic Algorithm

This paper presents an application of multi-objective optimisation for the design of an important component of automobiles, namely the suspension system. In particular, we focus on the

double wishbone

suspension, which is one of the most popular suspensions in use today and is commonly found on mid-range to high-end cars. The design of such mechanical systems is fairly complicated due to the large number of design variables involved, complicated kinematic model, and most importantly, multiplicity of design objectives, which show conflict quite often.

The above characteristic of the design problem make it ideally suited for a study in optimisation using non-classical techniques for multi-objective optimisation. In this paper, we use +NSGA-II+ [5] for searching an optimal solution to the design problem. We focus on two important performance parameters, namely

camber

and

toe

, and propose objective functions which try to minimise the variation of these as the wheel travels in

jounce

and

rebound

. The

pareto-optimal

front between these two objectives are obtained using multiple formulations and their results are compared.