Precision and Dynamic Behaviour Improvement in Flexible Structures by Means of New control Strategies Based on State space Observers

摘要

The flexibility of structural components and long distances between measuring systems and the point to be controlled produce major distortion in the dynamic performance of very large structures such as telescopes. This article deals with improving the dynamic performance of such flexible structures. Two strategies are proposed: on the one hand new control techniques capable of offsetting structural deformation, and on the other hand techniques capable of increasing damping in the system. The first strategy is oriented towards improving the precision of the system by estimating the position of the point on the structure to be controlled. The devices available for measuring the position of the point of interest are usually quite complex and expensive. This article proposes the use of a state space observer to estimate the position of the point of interest using easily measurable signals. The aim of the second control strategy is to increase damping in the system by means of the acceleration signal feedback. More damped dynamic behaviour and increased system stiffness against disturbances can be achieved. The acceleration signal can be measured or also estimated by means of a state space observer.