Robust passive tracking control for an uncertain soft actuator using robust right coprime factorization. (14th June 2021)

• Record Type: Journal Article
• Authors: Bu, Ni; Liu, Haoyu; Li, Wenpeng
• Is Part Of: International journal of robust and nonlinear control. Volume 31:Number 14(2021)
• Page Start: 6810
• Page End: 6825
• Publication Date: 2021-06-14
• Subjects: integral sliding mode control -- robust passive control -- soft actuator -- system identification; Automatic control -- Periodicals; Control theory -- Periodicals; Nonlinear systems -- Periodicals; 629.836
• DOI: 10.1002/rnc.5645
• Languages: English
• ISSNs: 1049-8923

Abstract

Abstract: As a research of human arm activities, the research of soft actuator is one of the important topics in the field of robotics. This article is concerned with the robust passive tracking control for an uncertain soft actuator by robust right coprime factorization (RRCF). First, applying the recursive least squares identification algorithm, the identification of the actuator modeling is studied by which the parameter of radius is estimated by using the experimental data. Second, the passivity of the soft actuator with inflatable rubber tube is discussed; meanwhile, the robustness of the soft actuator is ensured by the designed robust controllers. Third, by combining the RRCF and integral sliding mode control methods, the tracking performance is improved, for the soft actuator with time‐varying radius. Finally, the proposed methods are confirmed by the simulation with experimental data.