Accurate force reflection method for a multi-d.o.f. haptic interface using instantaneous restriction space without a force sensor in an unstructured environment

Authors: Kim, Keehoon; Chung, Wan Kyun; Nam, Sang Yep

Source: Advanced Robotics, Volume 21, Numbers 1-2, 2007 , pp. 87-104(18)

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Abstract:

This paper proposes an accurate force reflection method for a multi-d.o.f. haptic interface without a force sensor. Sensorless force reflection is possible using position-position (p-p) architecture. However, the conventional p-p architecture in the literature has limitations representing constraint space when it is applied to a multi-d.o.f. haptic interface in that it gives an inaccurate force direction. This paper demonstrates the limitation of the conventional p-p architecture through an example and proposes a novel force reflection method using the instantaneous restriction space (IRS) concept. The IRS can be calculated using the Jacobian and joint angle error of a slave manipulator. Since the proposed method has the form of an impedance two-port architecture in the sense of data flow, it can be easily combined with previous well-known results of two-port haptic display frameworks. The proposed method is especially useful when the slave manipulator collides with unexpected obstacles during motion, even though the slave does not have a force sensor. The performance of the proposed method is evaluated through experiments.

Keywords: HAPTIC DISPLAY; RESTRICTION SPACE; KINEMATIC DISSIMILARITY; MULTI-D.O.F. HAPTIC INTERFACE

Document Type: Research article

DOI: http://dx.doi.org/10.1163/156855307779293670

Publication date: 2007-01-01