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T. Pumhössel, H. Ecker, P. Hehenberger, K. Zeman:
"Controlled modal energy transfer in torsional systems using impulsive parametric excitation";
Talk: 9th IFToMM International Conference on Rotor Dynamics, Mailand; 09-22-2014 - 09-25-2014; in: "Proceedings 9th IFToMM International Conference on Rotor Dynamics", (2014), Paper ID MIQ9Z4, 10 pages.

In this contribution, the effect of impulsive parametric excitation
to the modal energy content of torsional systems is investigated.
First, it is shown analytically that impulsive parametric excitation allows
to transfer vibration energy between sets of modes of vibration. Transferring
vibration energy from lower to higher modes allows to utilize the
damping properties inherent in a mechanical structure much more effectively.
This leads to a faster decrease of the overall energy content, and
hence, of the vibrations of a mechanical system, compared to the case
where no impulsive parametric excitation is present, as it is demonstrated
with some numerical investigations.