Position control of flexible manipulator using non-linear Hinfin with state-dependent Riccati equation

• Published in: Proceedings of the Institution of Mechanical Engineers. Part I, Journal of systems and control engineering Journal of systems and control engineering, 2007-01, Vol.221 (3), p.475-486
• Main Authors: Shawky, A M, Ordys, A W, Petropoulakis, L, Grimble, M J
• Format: Article
• Language: English
• ISSN: 0959-6518
• DOI: 10.1243/09596518JSCE313

The paper is concerned with the control of the tip position of a single-link flexible manipulator. The non-linear model of the manipulator is derived and tested, assuming the number of model shape functions to be two. It is known that the assumed modes method introduces uncertainty to the model by neglecting higher-order dynamics. There are other sources of uncertainty, such as friction. In addition, the model is non-linear. Therefore, for the next task, which is the controller design, the Hinfin approach is proposed to deal efficiently with uncertainties, and the non-linear nature of the problem is addressed by the use of the state-dependent Riccati equation (SDRE) technique. Following the SDRE approach, the state-feedback non-linear control law is derived, which minimizes a quadratic cost function. This solution is then mapped into the Hinfin optimization problem. The resulting control law has been tested with the simulation model of the flexible manipulator and the results are discussed in the paper.