Authors:
Julián Salt,
Pedro Albertos,
Volume: 1, Page 4895 Paper number 1267
Abstract:
In many industrial control applications the control action updating
can be faster that the output measurement, leading to multirate controllers.
In the paper, the controller design is approached based on the characteristics
of each available sampling rate. The controller is split into two parts
acting at different sampling rates. By the lowest rate sub-controller
the main points of the desired response are determined while the response
envelope, approaching the continuous time response of the controlled
system is completed by the action of the fast rate control part. Cancellation
controllers, three-term controllers and PID controllers are designed
using this approach and promising results are obtained.
Authors:
Roozbeh Izadi-Zamanabadi,
Marcel Staroswiecki,
Volume: 1, Page 4901 Paper number 1954
Abstract:
An analysis of structural model representation has been used to extract
available inherent redundant information in the system. The paper presents
a refined structural model representation based on bipartite directed
graph definition and the necessary condition for structural observability
are proposed.
Authors:
Ming-Tzu Ho,
Volume: 1, Page 4903 Paper number 1154
Abstract:
Recent results have provided a complete characterization of all stabilizing
PID controllers for a given plant. This characterization has an elegant
property: for a given fixed proportional gain, the set of all stabilizing
integral and derivative gain values is the intersection of the admissible
solutions of sets of linear inequalities. Based on this characterization,
the design of non-fragile PID settings for enhancing the robustness
of the closed-loop systems to perturbations in the controller coefficients
is addressed.
Authors:
Ricardo H. C. Takahashi,
Daniel A. Dutra,
Reinaldo M. Palhares,
Pedro L. D. Peres,
Volume: 1, Page 4909 Paper number 1928
Abstract:
This paper addresses the design of robust non-fragile state feedback
controllers, with controller uncertain parameters described as polytope-type
convex-bounded uncertainties. The linearizing change of variables Z=KW
that is the basis for a large class of LMI-based robust control design
algorithms is slightly modified. The modified change of variables proposed
here leads to LMI-based robust non-fragile control design algorithms
that are directly derived from any former algorithm formulated in terms
of the traditional change of variables. In this way, the ``fragility''
issue is solved inside the mainstream of the LMI-based robust control
synthesis algorithms that have been developed up to now, in a unified
basis.
Authors:
Jiang Qian Ying,
Volume: 1, Page 4915 Paper number 21
Abstract:
A plant is strongly stabilizable if there exists a stable compensator
to stabilize it. This paper presents necessary conditions for the strong
stabilizability of complex and real n-D multi-input multi-output (MIMO)
shift-invariant linear plants. For the real case, the condition is
a generalization of the parity interlacing property of Youla et al.
for the strong stabilizability of a real 1-D MIMO plant. These conditions
are also sufficient for the cases of n-D plants with a single output
(MISO) or with a single input (SIMO). For general n-D MIMO plants,
we do not know if the conditions are sufficient or not. A useful sufficient,
but not necessary, condition for the strong stabilizability of a class
of n-D (n > 1) MIMO plants is given.
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