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Nonlinear Industrial Control Systems presents a range of mostly
optimisation-based methods for severely nonlinear systems; it
discusses feedforward and feedback control and tracking control
systems design. The plant models and design algorithms are provided
in a MATLAB (R) toolbox that enable both academic examples and
industrial application studies to be repeated and evaluated, taking
into account practical application and implementation problems. The
text makes nonlinear control theory accessible to readers having
only a background in linear systems, and concentrates on real
applications of nonlinear control. It covers: different ways of
modelling nonlinear systems including state space,
polynomial-based, linear parameter varying, state-dependent and
hybrid; design techniques for nonlinear optimal control including
generalised-minimum-variance, model predictive control,
quadratic-Gaussian, factorised and H design methods; design
philosophies that are suitable for aerospace, automotive, marine,
process-control, energy systems, robotics, servo systems and
manufacturing; steps in design procedures that are illustrated in
design studies to define cost-functions and cope with problems such
as disturbance rejection, uncertainties and integral wind-up; and
baseline non-optimal control techniques such as nonlinear Smith
predictors, feedback linearization, sliding mode control and
nonlinear PID. Nonlinear Industrial Control Systems is valuable to
engineers in industry dealing with actual nonlinear systems. It
provides students with a comprehensive range of techniques and
examples for solving real nonlinear control design problems.
Many large-scale processes like refineries or power generation
plant are constructed using the multi-vendor system and a main
co-ordinating engineering contractor. With such a methodology. the
key process units are installed complete with local proprietary
control systems in place. Re-assessing the so called lower level
control loop design or structure is becoming less feasible or
desirable. Consequently, future comp~titive gains in large-scale
industrial systems will arise from the closer and optimised global
integration of the process sub-units. This is one of the inherent
commercial themes which motivated the research reported in this
monograph. To access the efficiency and feasibility of different
large-scale system designs, the traditional tool has been the
global steady-state analysis and energy balance. The process
industries have many such tools encapsu lated as proprietary design
software. However, to obtain a vital and critical insight into
global process operation a dynamic model and simulation is
necessary. Over the last decade, the whole state of the art in
system simulation has irrevocably changed. The Graphical User
Interface (G UI) and icon based simulation approach is now standard
with hardware platforms becoming more and more powerful. This
immediately opens the way to some new and advanced large-scale
dynamic simulation developments. For example, click-together blocks
from standard or specialised libraries of process units are
perfectly feasible now.
This monograph was motivated by a very successful workshop held
before the 3rd IEEE Conference on Decision and Control held at the
Buena Vista Hotel, lake Buena Vista, Florida, USA. The workshop was
held to provide an overview of polynomial system methods in LQG (or
H ) and Hoo optimal control and 2 estimation. The speakers at the
workshop were chosen to reflect the important contributions
polynomial techniques have made to systems theory and also to show
the potential benefits which should arise in real applications. An
introduction to H2 control theory for continuous-time systems is
included in chapter 1. Three different approaches are considered
covering state-space model descriptions, Wiener-Hopf transfer
function methods and finally polyno mial equation based transfer
function solutions. The differences and similarities between the
techniques are explored and the different assumptions employed in
the solutions are discussed. The standard control system
description is intro duced in this chapter and the use of Hardy
spaces for optimization. Both control and estimation problems are
considered in the context of the standard system description. The
tutorial chapter concludes with a number of fully worked ex
amples."
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