Designing Dynamic Temporal Controls for Critical Systems
Designing Dynamic Temporal Controls for Critical Systems
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Date
1998-10-15
Authors
Choi, Seonho
Agrawala, Ashok K.
Shi, Leyuan
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Abstract
Traditional control systems have been designed to exercise control at
regularly spaced time instants. When a discrete version of the system dynamics
is used, a constant sampling interval is assumed and a new control value is
calculated and exercised at each time instant. In this paper, we propose a new
control
scheme, {\it dynamic temporal control},
in which we not only calculate the control value but also
dynamically decide the time instants when the new control computations
have to be calculated. Taking a
discrete, linear,
time-invariant system, and a cost function which reflects a cost for
computation of the
control values, as an example, we show the feasibility of using this
scheme. We implement
the dynamic temporal control scheme in a rigid body satellite control example
and demonstrate the significant reduction in cost. The scheme proposed
here can be implemented using real-time operating system, such as {\em Maruti},
which schedules activities along the time axis. The reduced computations
for control permit the use of the same processor for higher level
functions resulting in a significant improvement in the performance of
the overall system.
(Also cross-referenced as UMIACS-TR-97-51)