Semi-active vibration control by means of electro-magnetic elements

The PhD project is focused on an implementation of the electromagnetic elements,
i.e. devices capable to introduce non-linear electromagnetic forces into a mechanical
system. Furthermore, as the electromagnetic elements are connected to the
electric circuit, serving as a source of electromagnetic force, coupling of three physical
domains, namely electrical, mechanical and magnetic, is established. Since
the electromagnetic force is of a non-linear nature, the system constitutes a coupled
multidisciplinary non-linear problem. In the thesis the non-linear problem is
addressed from the analytical view point and a dynamical response at close to resonance
operation region is analysed using the method of multiple scales. For the
multi degree of freedom system a modal interaction is investigated. The operation
regions are identied and discussion on control presented. The parameters of the
controller are searched experimentally and the operation regions are veried by
means of a numerical experiment as well as using simple experimental set-ups. A rapid reduction of an amplitude of vibration (due to additional damping) as well
as natural frequency reduction (detuning of resonance) are identied analytically,
as well as experimentally.