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Rate-hardness: a new performance metric for haptic interfaces

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5 Author(s)
Lawrence, D.A. ; Dept. of Aerosp. Eng. Sci., Colorado Univ., Boulder, CO, USA ; Pao, Lucy Y. ; Dougherty, A.M. ; Salada, M.A.
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Rate-hardness is introduced as a quality metric for hard virtual surfaces, and linked to human perception of hardness via a psychophysical study. A 3 degree-of-freedom haptic interface is used to present pairs of virtual walls to users for side-by-side comparison, 19 subjects are tested in a series of three blocks of trials, where different virtual walls are presented in randomly ordered pairs. Results strongly support the use of rate-hardness, as opposed to mechanical stiffness, as the more relevant metric for haptic interface performance in rendering hard virtual surfaces. It is also shown that common techniques of enhancing stability of the rendered surfaces tend to actually enhance performance as measured by rate-hardness

Published in:

Robotics and Automation, IEEE Transactions on  (Volume:16 ,  Issue: 4 )

Date of Publication:

Aug 2000

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