Actuator saturation is probably the most frequent nonlinearity
encountered in control applications. Input saturation leads to
controller windup, removable by structural modification during
compensator realization and plant windup which calls for additional
dynamics.
Peter Hippe presents solutions to the windup prevention problem
for stable and unstable single-input-single-output and
multiple-input-multiple-output (MIMO) systems. The solutions use
only standard tools for the investigation of linear systems a"
state equations, transfer functions, etc. The stability tests are
based on well-known criteria for loops consisting of a linear part
with isolated sector-type nonlinearity. Less rigorous "engineering
solutions" which guarantee improved performance but without strict
proof of stability are also demonstrated.
MIMO systems in which the behaviour of controlled variables is
decoupled require specific input vectors and so also suffer
problems of directionality when their input signals saturate. This
can have extremely deleterious consequences for closed-loop
behaviour. Windup in Control offers an exact solution to this
directionality problem for stable and unstable systems. The methods
laid out in this survey also integrate solutions for applications
with rate-constrained actuators and for bumpless transfer from
manual to automatic during system start-up or in override control.
Developments in control methods are always supplemented by easily
repeated numerical examples.
Academics doing control-related research in electronics,
mechanics, or mechatronics and engineers working in the process
industries will find this book an extremely useful overview of
systematic windupprevention for all kinds of systems. It also has
valuable insights to offer the graduate student of control.
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