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Adaptive Tracking Control of Nonholonomic Mobile Robots by Computed Torque
TiChung LEE ChingHung LEE ChingCheng TENG
Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Vol.E86A
No.7
pp.17661777 Publication Date: 2003/07/01 Online ISSN:
DOI: Print ISSN: 09168508 Type of Manuscript: PAPER Category: Systems and Control Keyword: mobile robots, tracking, timevarying system, nonlinear systems, backstepping,
Full Text: PDF(430.6KB)>>
Summary:
A computed torque controller for a dynamic model of nonholonomic mobile robots with bounded external disturbance is proposed to treat the adaptive tracking control problem using the separated design method. A velocity controller is first designed for the kinematic steering system to make the tracking error approaching to zero asympotically. Then, a computed torque controller is designed such that the true mobile robot velocity converges to the desired velocity controller. In each step, the controllers are designed independently, and this will simplify the design of controllers. A novel stability analysis involving the estimation of some differential inequalities is also given to guarantee the stability of the closedloop system. Moreover, the regulation problem and the tracking problem will be treated using the proposed controller. In particular, the mobile robots can globally follow any path such as a straightline, a circle and the path approaching to the origin. Furthermore, the problems of backintogarage parking and the parallel parking problem can also be solved using the proposed controller. Some interesting simulation results are given to illustrate the effectiveness of the proposed tracking control law.

