Author : Joaquin Astorga
Publisher :
ISBN 13 :
Total Pages : 238 pages
Book Rating : 4.:/5 (238 download)
Book Synopsis Robust Low-order Control of Flexible Joint Manipulators by : Joaquin Astorga
Download or read book Robust Low-order Control of Flexible Joint Manipulators written by Joaquin Astorga and published by . This book was released on 1990 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents the application of novel linear time invariant techniques to the design of low-order controllers for flexible joint manipulators. The nonlinear manipulator model is linearized via the perturbation method about an unstable operating point. Some nonlinear terms are treated as an external disturbance, and parametric uncertainty is represented as the structured uncertainty of the nominal plant. The $Hsb{infty}$-norm approach is then utilized to design a robust state feedback controller to stabilize the linear system and to give a specified bound on the disturbance rejection of the closed-loop system with enough robustness margin as to stabilize the actual nonlinear model. The nominal linear system with the state feedback controller determines the reference dynamics to be retained by the low-order controller based on the projective controls approach. The residual dynamics of the closed-loop system are selected under a suitable criterion to enhance disturbance rejection. The nonlinear model of the manipulator is also treated as a nonlinear system with structured uncertainty and sufficient conditions are determined for stability and disturbance rejection using linear state feedback and full-order controllers. Examples are given in the case of the one-link and two-link manipulators. The decentralized control option is also studied. The design of the controllers is based on a linear decoupled model obtained from the linearized model. The methodology here follows the same two phases of design used in the centralized case. Adaptive mechanisms are illustrated to improve the robust performance of the low-order decentralized control.