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UNDESIRABLE DYNAMIC BEHAVIOUR OF MECHANICAL STRUCTURES-Catastrophic and high amplitude resonating modes of vibration due to periodical excitation (e.g. earthquakes) or internal disturbing sources (e.g. engines);-Instability with self generated vibrations (e.g. wind induced aero elastic flutter, chatter in cutting processes);-Bad accuracy of the response due to step or impulse excitation (e.g. overshoot).
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