Stability-Guaranteed Impedance Control of Hydraulic Robotic Manipulators

Janne Koivumäki, Jouni Mattila

    Research output: Contribution to journalArticleScientificpeer-review

    103 Citations (Scopus)
    115 Downloads (Pure)


    In challenging robotic tasks, high-bandwidth closedloop control performance of the system is required for successful task completion. One of the most critical factors inhibiting the wide-spread use of closed-loop contact control applications has been the control system stability problems. To prevent unstable system behavior, the need for rigorously addressed manipulator dynamics is substantial. This is because the contact dynamics between a manipulator and its environment can be drastic. In this paper, a novel Cartesian space impedance control method is proposed for hydraulic robotic manipulators. To address the highly nonlinear dynamic behaviour of the hydraulic manipulator, the system control is designed according to the subsystem-dynamics-based virtual decomposition control (VDC) approach. The unique features of VDC (virtual power flow and virtual stability) are used to analyze the interaction dynamics between the manipulator and the environment. Based on the desired impedance parameters and stability analysis, an explicit method to design the control gains for the proposed impedance control law is developed. The L2 and L¥ stability is guaranteed in both free-space motions and constrained motions. Experimental results demonstrate that the hydraulic robotic manipulator is capable of adjusting its dynamic behaviour accurately in relation to the imposed target impedance behaviour. This provides compliant system behaviour, which is needed in many dynamically challenging robotic tasks.
    Original languageEnglish
    Pages (from-to)601-612
    JournalIEEE - ASME Transactions on Mechatronics
    Issue number2
    Early online date2016
    Publication statusPublished - 2017
    Publication typeA1 Journal article-refereed


    • Impedance
    • Manipulator dynamics
    • Nonlinear dynamical systems
    • Service robots
    • Stability analysis
    • hydraulic manipulators
    • impedance control
    • nonlinear model-based control
    • stability analysis
    • virtual decomposition control
    • virtual power flow

    Publication forum classification

    • Publication forum level 2


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