DYNAMICS OF ESSENTIALLY NONLINEAR VIBRATION ABSORBER COUPLED TO HARMONICALLY EXCITED 2 DOF SYSTEM

This paper investigates mitigation of vibrations in 2 DOF forced linear system with nonlinear energy sink (NES) attached. It is shown that analytic methods developed recently for description of periodic and strongly modulated response regimes in the two DOF harmonically excited systems (containing NES) may be successfully applied for 3 DOF system. Ability of the properly tuned NES to successfully absorb energy for each excited mode of the linear subsystem is demonstrated. Proposed methodology of the NES tuning guidelines is based on the analytical treatment developed for the system under investigation. Essentially nonlinear vibration absorber is compared to the best tuned linear one and excitation zones of preference of the nonlinear absorber are revealed.

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