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Multi degree-of-freedom input-to- state stable approach for stable haptic interaction

Jafari, Aghil; Nabeel, Muhammad; Ryu, Jee-Hwan

Authors

Muhammad Nabeel

Jee-Hwan Ryu



Abstract

Passivity has been the most often used constraint for the controller design of haptic interfaces. However, the designed controller based on passivity constraint has been suffering from its conservatism, especially when the user wants to increase the maximum achievable impedance. To overcome this problem, our group have proposed Input-to-State Stable (ISS) approach [1], which reduce the design conservatism of the passivity-based controller by allowing bigger output energy from the haptic interface compared with the passivity-based controller while guaranteeing the stability. However, the previous paper was limited to single Degree-of-Freedom (DoF) systems. This paper extends the ISS approach for multi-DoF haptic interaction. For multi-DoF haptic interaction, penetration depth-based rendering method using Virtual Proxy (VP) is adopted, and VP allows us to decouple the interaction into each axis. Although the interaction can be decoupled, previous ISS analysis “cannot” be directly implemented because the decoupled system, unlike to the previous case, has unconstrained end point, that is a moving Virtual Environment (VE). To include the moving VE into the ISS approach, we extend the previous one-port ISS approach to two-port ISS approach, and generalize this into multi-DoF ISS approach by augmenting each two-port analysis. Proposed approach is experimentally verified with Phantom Pre. 1.5, and showed the effectiveness of the proposed multi-DoF ISS approach.

Citation

Jafari, A., Nabeel, M., & Ryu, J. Multi degree-of-freedom input-to- state stable approach for stable haptic interaction. Paper presented at IEEE World Haptics Conference (WHC 2015), Chicago

Presentation Conference Type Conference Paper (unpublished)
Conference Name IEEE World Haptics Conference (WHC 2015), Chicago
Acceptance Date Jun 14, 2015
Online Publication Date Aug 6, 2015
Publication Date Jun 14, 2015
Deposit Date Sep 1, 2017
Peer Reviewed Peer Reviewed
Keywords haptic interfaces, virtual environments, force, hysteresis, probes, stability analysis, rendering (computer graphics)
Public URL https://uwe-repository.worktribe.com/output/832713
Publisher URL http://dx.doi.org/10.1109/WHC.2015.7177728
Additional Information Title of Conference or Conference Proceedings : IEEE World Haptics Conference (WHC 2015)