Magneto-rheological (MR) dampers, recently, have found many successful applications in civil engineering and
numerous area of mechanical engineering. When an MR damper is to be used for vibration suppression, an inevitable
problem is to determine the input voltage so as to gain the desired restoring force determined from the control law. This
is the so-called inverse problem of MR dampers and is always an obstacle in the application of MR dampers to vibration
control. It is extremely difficult to get the inverse model of MR damper because MR dampers are highly nonlinear and
hysteretic. When identifying the inverse model of MR damper with simple fuzzy system, there maybe exists curse of
dimensionality of fuzzy system. Therefore, it will take much more time, and even the inverse model may not be
identifiable. The paper presents two-layer hierarchical fuzzy system, that is, two-layer hierarchical ANFIS to deal with
the curse of dimensionality of the fuzzy identification of MR damper and to identify the inverse model of MR damper.
Data used for training the model are generated from numerical simulation of nonlinear differential equations. The
numerical simulation proves that the proposed hierarchical fuzzy system can model the inverse model of MR damper
much more quickly than simple fuzzy system without any reduction of identification precision. Such hierarchical ANFIS
shows the higher priority for the complicated system, and can also be used in system identification and system control
for the complicated system.
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