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Indexed by:期刊论文

Date of Publication:2014-06-01

Journal:INTERNATIONAL JOURNAL OF ADAPTIVE CONTROL AND SIGNAL PROCESSING

Included Journals:SCIE、EI、Scopus

Volume:28

Issue:6

Page Number:523-535

ISSN No.:0890-6327

Key Words:spherical robot; underactuated; ground adaptivity; hierarchical sliding mode

Abstract:Unlike the traditional underactuated mechanical system, the equilibrium point of the inner swing-up suspension of a spherical robot possesses stable and dynamic characteristics. The stable dynamic equilibrium position of the underactuated suspension must agree well with the uncertain rolling resistance in practice. To overcome this special underactuated problem with dynamic equilibrium, we present an adaptive control scheme to enhance the ground adaptability using hierarchical sliding mode approach. The control method can drive the spherical robot to a desired position, and at the same time, the suspension subsystem holds on their dynamic equilibrium points rapidly. The proposed control approaches are verified to be effective by numerical simulation for a spherical robot to achieve satisfactory control performances, such as ground adaptability, rapid convergence, and disturbance rejection. Copyright (C) 2013 John Wiley & Sons, Ltd.