A case study towards the application of NMPC to a continuously variable semi-active suspension

This paper presents a simulation-based study of the perform ance achievable by a continuously variable electro-hydraulic semi-active suspension system. By appl ying state-of-the-art dynamic optimization techniques, a direct optimal controller is developed for a nonli near quarter car model that includes an identified semi-physical damper model. The direct optimal control app roach offers an intuitive framework to take the constraints and the nonlinear dynamics of the suspension sy stem into account. The performance of the designed direct optimal controller is compared to those obtai ned using a clipped optimal and a clipped optimal preview controller. The direct optimal control reveals an i mproved performance with respect to the clipped optimal approaches. The handling characteristic benefits t he most from the included road preview and the accurate representation of the nonlinear system dynamics.

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