Impedance control based two-channel architecture in time delayed teleoperation system

Yoshimura, Nobuto; Ohnishi, Kouhei

doi:10.1109/isie.2014.6864785

Cited by 2 publications

(1 citation statement)

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“…[30] presents a transparency-optimized approach, but it requires switching between control laws. [31] utilizes impedance control as a tool for two-channel architecture, but demands the incorporation of acceleration control. [32] achieves a satisfactory balance between stability and transparency, introducing force reflection filters.…”

Section: Reducing To a 2-channel Architecturementioning

confidence: 99%

Enhancement of Stability and Transparency in Teleoperated Robots Through Isotropy-Based Design

2020

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The primary challenge in implementing teleoperated master-slave robots is that both of its objectives-stability and transparency, are conflicting to each other. This trade-off is usually attributed to the time-delay in the communication channel, and state-of-the-art controllers are proposed primarily to counteract the effects of this time delay. Despite such controllers, it is observed that the system suffers from instability and inaccurate force feedback (loss of transparency), at least under certain conditions. This is because issues other than time delay which cause oscillations and inaccurate force feedback are rarely addressed in the literature. In this paper, such issues are clearly identified and it is shown here that controller design cannot counteract these issues. It is proposed in this paper that an isotropy based design of robots is necessary for recovering the additional stable and transparent behavior of the system, apart from what a controller can achieve. Another significant contribution of this paper is that because of the proposed design, the need for two signals from the traditional four-channel teleoperation architecture is eliminated, thus reducing the complexity of the system. Experimental validation is carried out by implementing a twochannel architecture on the designed robots. INDEX TERMS Bilateral teleoperation, conditioning index, isotropy based design, stability, teleoperation architecture, transparency.

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Section: Reducing To a 2-channel Architecturementioning

confidence: 99%