Mechanical and control design of a variable geometry active suspension system

In this study, a variable geometry active suspension system is considered. Actuation is employed to vary the leverage ratio between spring/damper unit and road wheel assembly. Since actuation is substantially perpendicular to the main suspension unit forces, work is primarily done only against frict ional resistances to motion and the systems have inherently low force and e nergy requirements. Mechanical design and control system design involving p roportional/differential elements or neural networks are discussed. System performance in self-levelling, free vibrations and manoeuvring of a theoret ical vehicle are calculated. Good control of roll angle and jacking respons es are predicted and energy economy is confirmed by these trials, which inc lude a detailed consideration and modelling of the electrical actuators. Th e results reinforce the notion that variable geometry schemes have practica l applications potential and are worthy of further research effort.