Abstract
In recent years, significant strides have been made in enhancing stiffness design to improve energy dissipation efficiency. Nevertheless, there appears to be limited discourse on the concept of decomposing vibrational energy into multiple frequencies to enable concurrent dissipation. This paper introduces an innovative isolator denoted as NES-C, characterized by polynomial variable stiffness, consisting of a nonlinear energy sink and a polynomial damped frequency converter (PDFC). Tristate NES-C and quad-state NES-C configurations are realized by exploiting the nonreciprocal nature of energy propagation within the PDFC framework. Numerical simulations reveal that NES-C exhibits adaptive stiffness modulation contingent upon vibration intensity, facilitates frequency decomposition, and exhibits superior damping characteristics compared to the conventional Type I NES. Investigation into the influence of various parameters on the vibration mitigation performance of NES-C reveals that quad-state NES-C exhibits heightened robustness relative to tristate NES-C, particularly in cases involving smaller initial impulses. Additionally, the amalgamated attributes of PDFC impart enhanced programmability to NES-C design.
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