VIBRATION ISOLATION BASED ON NONLINEAR MODE LOCALIZATION

Abstract eng:
We study a nonlinear vibration isolation system capable of, (a) isolating its upper part (the ‘machine’) from periodic disturbances generated at its base; and (b) simultaneously isolating its base from periodic disturbances generated at the level of the machine. By making use of essentially nonlinear (i.e. nonlinearizable) stiffness elements we completely eliminate resonances close to linearized modes, thus achieving vibration isolation over an extended frequency range. Instead, we prove the existence of branches of localized steady state motions in the frequency domain. Indeed, these localized forced motions are principally responsible for fulfilling the dual mode vibration isolation objective of this work.

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