Authors:
Cecilia Elisabet Garcia,
Beatriz del Carmen Morales,
Ricardo Oscar Carelli,
Jose Francisco Postigo,
Volume: 1, Page 3453 Paper number 1931
Abstract:
The stability analysis of a two-degree-of freedom teleoperation system,
considering the remote station as a non-linear system, is presented.
The non-linearity arises in the remote robot's model. Force and position
data are backfed from the local to the remote station. The time delay
between both stations is fixed and known. A model of the human operator
is incorporated into the dynamics of the local station, while a model
of the environment is incorporated into the dynamics of the remote
station. The analysis, based on operators theory, ensures that system
signals remain within a small bounded region. The validity of the theoretical
results are verified by simulation.
Authors:
Shadi Rostami,
Babak Hamidzadeh,
Dan Camporese,
Volume: 1, Page 3459 Paper number 2020
Abstract:
This paper discusses a scheduling technique, for cluster tools, that
addresses post-processing residency constraints and throughput requirements.
The residency constraints impose a limit on the post-processing time
that a material unit spends in a processing module. The technique searches
in the time and resource domains for a feasible schedule with a maximum
throughput. Several heuristics are designed and added to reduce the
complexity of the scheduling algorithm. The resulting schedules are
deadlock free, since resources are scheduled according to the times
that they are available. Analytical and experimental analyses demonstrate
the correctness and efficiency of our proposed technique.
Authors:
Fabrizio Caccavale,
Luigi Villani,
Volume: 1, Page 3465 Paper number 1691
Abstract:
In this paper a geometrically consistent impedance concept is applied
to control a multi-arm system. The case of a common rigid object rigidly
grasped by the manipulators in the system is considered. A six-DOF
impedance behaviour is enforced at the object level so as to keep limited
the force/moment due to the interaction with an external environment.
Moreover, in order to avoid large internal forces, a six-DOF impedance
behaviour is imposed at each end-effector. The adoption of the unit
quaternion to describe object frame orientation ensures consistency
with the task geometry. The overall control scheme is of inverse dynamics
type with an inner motion loop which provides robustness to unmodeled
dynamics and disturbances.
Authors:
Napoleon Nazir,
Tasuku Hoshino,
Katsuhisa Furuta,
Volume: 1, Page 3471 Paper number 1896
Abstract:
This paper presents a new hand over method of unstable object using
robot manipulators by an approach of continuously switching of controllers.
Each of robot manipulator can be considered as a controller to stabilize
the object. It is needed to switch from one controller to another
one so that the input of the system does not exceed the value which
is required to stabilize the object. However, it is known that if
the controller switches at unsuitable time, the system may become
unstable. The idea of a new method that is presented here is to make
a switching of the controllers based on Double Bracket Flow. It will
be shown that even if switching time is done at any time, the system
remains stable. Experimental results using two Puma-like 6 D.O.F.
robot to hand over an inverted pendulum from one robot to another
are included.
Authors:
Stergios I. Roumeliotis,
George A. Bekey,
Volume: 1, Page 3477 Paper number 96
Abstract:
In this paper we present a new approach to the problem of simultaneously
localizing a group of mobile robots capable of sensing each other.
Each of the robots collects sensor data regarding its own motion and
shares this information with the rest of the team during the update
cycles. A single estimator, in the form of a Kalman filter, processes
the available positioning information from all the members of the team
and produces a pose estimate for each of them. The equations for this
centralized estimator can be written in a decentralized form therefore
allowing this single Kalman filter to be decomposed into a number of
smaller communicating filters each of them processing local (regarding
the particular host robot) data for most of the time. The resulting
decentralized estimation scheme constitutes a unique mean for fusing
measurements collected from a variety of sensors with minimal communication
and processing requirements. The distributed localization algorithm
is applied to a group of 3 robots and the improvement in localization
accuracy is presented. Finally, a comparison to the equivalent distributed
information filter is provided.
Authors:
Daniel J. Stilwell,
Bradley E. Bishop,
Volume: 1, Page 3483 Paper number 2119
Abstract:
Development of decentralized control systems for platoons of robotic
vehicles often requires direct communication between vehicles. Using
basic tools from the field of decentralized control, we develop a framework
from which existence of vehicle controllers can be assessed for a given
communication structure. This approach to control design allows us
to investigate minimum inter-vehicle communication solutions. Simulation
results are presented for a platoon of autonomous underwater vehicles.
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