E. Schmidt, H. Ecker:
"Prototype Design and Experimental Verification of an Electromagnetic Actuator for Parametric Stiffness Excitation";
Talk: IEEE Canadian Conference on Electrical and Computer Engineering (CCECE), Calgary, Alberta, Canada; 05-02-2010 - 05-05-2010; in: "Proceedings of the IEEE Canadian Conference on Electrical and Computer Engineering (CCECE)", (2010), ISBN: 978-1-4244-5376-4; 1 - 5.

Initial design, realization and application of a novel electromagnetic actuator to create a time-harmonic variation of a mechanical stiffness will be discussed. 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. Thus, 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 novel 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.

http://publik.tuwien.ac.at/files/PubDat_192068.pdf