Two-arm trajectory planning in a manipulation task |
| |
Authors: | GJ Garvin M Žefran EA Henis V Kumar |
| |
Institution: | (1) GRASP Laboratory, University of Pennsylvania, Philadelphia, PA 19104-6228, USA, US;(2) Information Principles Laboratory, AT&T Bell Laboratories, Murray Hill, NJ 07974, USA, US |
| |
Abstract: | This paper addresses the trajectory planning problem for a task which requires positioning and orienting an object firmly
grasped by two hands at a visually specified goal configuration in the horizontal plane. The motor task involves three degrees
of freedom (two translational and one rotational), and the motions of the arms are constrained by the physical coupling through
the held object. Experimentally measured trajectories of two arms in the coordinated positioning/orienting task are presented.
The hypothesis that the rotational and translational components of motions are decoupled and independently planned is tested.
Two explicit mathematical models to account for the kinematic features of the two-arm motions are formulated, and the predictions
of the models are compared with the experimental data. Both models extend the minimum-jerk model to the two-arm coordinated
motions case. The trajectories predicted by the models were found to be in qualitative agreement with the experimental data.
However, neither model could account for the observed configuration dependence of the motions, nor for some of the properties
of the measured velocity components of the motions. Our findings support the idea that the rotational and translational components
of two-arm motions in the positioning/orienting task are independently planned in extra-personal space, and are further combined
in a hierarchical fashion to produce the observed motions. The tested models may serve as a basis for further investigations
of issues pertinent to the generation of two-arm trajectories.
Received: 27 March 1995 / Accepted in revised form: 17 September 1996 |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|