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Paper TuA206.3

Yasrebi, Naser (University of Victoria), Constantinescu, Daniela (University of Victoria)

Passive Wave Variable Control of Haptic Interaction with an Unknown Virtual Environment

Scheduled for presentation during the Regular Sessions "Haptics and Haptic Interfaces I" (TuA206), Tuesday, May 10, 2011, 10:35−10:50, Room 5A

2011 IEEE International Conference on Robotics and Automation, May 9-13, 2011, Shanghai International Conference Center, Shanghai, China

This information is tentative and subject to change. Compiled on March 29, 2020

Keywords Haptics and Haptic Interfaces

Abstract

The wave variable transformation cannot be exploited for the control of sampled-data and discrete-time systems without precaution. This paper shows that connecting a haptic interface to a discrete time virtual environment through a wave variable controller can inject energy into the haptic feedback loop and thus jeopardize the stability of the haptic interaction. The connection involves a one step computational delay when the virtual environment is not known prior to starting the interaction. Using the Jury-Marden stability criterion, the paper investigates the effect of this computational delay on the stability of wave variable control of haptic interaction with a virtual wall. It also develops a time domain passivity analysis to compute the energy injected in the wave variable transformation by the computational delay. Then, it proposes an algorithm for dissipating the extra energy and restoring the passivity of the wave variable transformation. The paper concludes with the experimental validation of the energy dissipating algorithm.

 

 

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