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E. Schmidt, W. Paradeiser, F. Dohnal, H. Ecker:
"Design of an Electromagnetic Actuator for Parametric Excitation Realization";
Talk: The 12th International IGTE Symposium on Numerical Field Calculation in Electrical Engineering, Graz, A; 2006-09-18 - 2006-09-20; in: "Proceedings of the 12th International IGTE Symposium on Numerical Field Calculation", (2006), ISBN: 978-3-902465-56-6; 336 - 341.

This article reports on design, realization and application of a novel
electromagnetic actuator to create a time-harmonic variation of a
mechanical stiffness. It is known from theoretical studies, that such a
time-periodic parameter variation at a non-resonant parametric resonance
frequency can improve the damping behaviour of a mechanical system. To
demonstrate this effect, an effective and easy to control actuator is
necessary. Therefore, a device consisting of a current driven coil
positioned between two permanent magnets has been designed and tested.
Finite element analyses have been carried out to obtain the mechanical
stiffness provided as a function of the coil current excitation. With
this electromagnetic actuator it is possible to demonstrate the improved
damping behaviour of a mechanical two-mass system, when the actuator is
operating at or near a certain parametric combination resonance frequency.