Abstract
Nonlinear energy sink (NES) can passively absorb broadband energy from primary oscillators. Proper multiple NESs connected in parallel exhibit superior performance to single-degree-of-freedom (SDOF) NESs. In this work, a linear coupling spring is installed between two parallel NESs so as to expand the application scope of such vibration absorbers. The vibration absorption of the parallel and parallel-coupled NESs and the system response induced by the coupling spring are studied. The results show that the responses of the system exhibit a significant difference when the heavier cubic oscillators in the NESs have lower stiffness and the lighter cubic oscillators have higher stiffness. Moreover, the e±ciency of the parallel-coupled NES is higher for medium shocks but lower for small and large shocks than that of the parallel NESs. The parallel-coupled NES also shows superior performance for medium harmonic excitations until higher response branches are induced. The performance of the parallel-coupled NES and the SDOF NES is compared. It is found that, regardless of the chosen SDOF NES parameters, the performance of the parallel-coupled NES is similar or superior to that of the SDOF NES in the entire force range.
Highlights
Nonlinear energy sink (NES) can engage in resonance with modes over broad frequency bands because of lacking a preferential resonant frequency
In order to meet the engineering requirements, several novel devices based on the theory of targeted energy transfer are proposed
The results demonstrate that regardless of the SDOF NES parameters chosen, the parallel-coupled NES with performance close or superior to this SDOF NES can always be constructed across the entire force range
Summary
Nonlinear energy sink (NES) can engage in resonance with modes over broad frequency bands because of lacking a preferential resonant frequency. Vibro-impact NES[4,5,6] is the least like original design of purely cubic stiffness absorber It consumes energy through the impact between the primary system and an internal impactor, and can be connected in parallel with cubic NES to enhance energy absorption[7,8]. Several traditional cubic NESs can be connected in series or parallel so as to improve the vibration absorption performance. A linear spring is attached to two traditional cubic NESs in parallel to construct parallel-coupled NES with favorable performance over a large range of excitations.
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