Abstract
The control loops of the actuators of a road simulator are subjected to load cross-coupling from the dynamics of differential fore to aft and/or left side to right side motions of the test vehicle. In this paper, appropriate interaction measures suitable for time-domain analysis of non-linear systems are presented and used to evaluate the proposed decentralised control structures for a four-post road simulator. A non-linear model of the electrohydraulic actuators and a non-linear multi-body model of a transit bus were developed for this purpose using the commercial software ADAMS. Simulation results show that a decentralised control structure acting on actuator load-plate positions keeps interaction to lower levels than the open-loop case. On the other hand, a decentralised control structure acting on a remote response parameter like spindle vertical acceleration faces strong interaction effects.
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