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Chapter 9
Neuro-Fuzzy Control for Semi-active Dampers
G. Nicolás Marichal, Ángela Hernández, Isidro Padrón, Alfonso Poncela,
María Tomás-Rodríguez and Evelio González
9.1 Introduction
In many engineering applications, vibrations are a very typical type of disturbances.
Due to this, different technologies have been developed in order to reduce (or
ultimately eliminate) the potential negative impact they may incur on mechanical
systems. In this sense, great efforts have been done in devising new vibration control
methodologies in recent years. In particular, several researchers have paid special
attention to semi-active dampers. The classical approach has been to use passive
dampers, but these devices are unable to adapt themselves to changes in the vibra-
tion characteristics, whilst semi-active dampers can adapt to the changes, simply by
modifying the structural damper parameters.
On the other hand, several active approaches have been used in order to reduce
vibrations and their impact on mechanical systems. The active approaches allow
the control system to adapt its parameters in an on-line mode to new features that
may appear on the vibration signal. However, these active methodologies are asso-
ciated to high energy consumption as it is necessary to generate opposite forces
in order to compensate the forces which produce the disturbances vibrations. In
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