Near resonance vibration isolation on a levered-dual response (LEDAR) Coulomb-damped system by differential preloads/offsets in linear springs

The levered-dual response (LEDAR) Coulomb-damped system attains near resonant vibration isolation by differential preloads/offsets in linear springs. It takes the advantages of both the preloads/offsets in linear springs and the guiderail friction for realizing different levels of vibration isolation. The isolation capacities are investigated on the strategies with both the horizontal and vertical guiderails, with the horizontal rail only, and without guiderails. The compressive preloads generally result in the consumption of most of the initial excitation energy so as to overcome the potential threshold. The isolation onsets at the frequency ratio of 1 ∓ 0.095 on the left-hand side (LHS) and the right-hand side (RHS) of the lever are relative to the load plate connector. The observed near resonant isolation thus makes the LEDAR system a candidate for the isolation of the mechanical systems about resonance while opening a path for simultaneous harvester-isolation functions and passive functions at extreme frequencies.