Abstract
Nonlinear energy sink (NES) has proven to be very effective in reducing the vibration response of structures. In this paper, a magnetic bistable nonlinear energy sink (BNES) that composed of a guided moving mass attached with linear springs and permanent magnets is proposed. To assess the seismic control performance of the proposed BNES, a shear frame model equipped with the proposed BNES is compared with the same shear frame model equipped with an optimized cubic NES and with a linear tuned mass damper (TMD) system. The results show that, in the idealized situation, where the mass and stiffness is clearly defined (no uncertainty), the BNES can achieve similar performance as a thoroughly in-tuned TMD system. Moreover, in the detuned condition, due to broadband high internal resonance capability, the proposed BNES can outperform the linear TMD and the cubic NES. The study demonstrates that the proposed BNES can be used as an efficient passive vibration absorber for structural seismic control.
Highlights
Passive tuned mass dampers (TMDs) are efficient and lowcost devices to reduce the vibration response of structures
Linear or equivalently linear TMD has been used as effective passive vibration control devices for seismic application
A magnetic bistable nonlinear energy sink (BNES) is proposed. e present BNES utilizes permanent magnets with a moving mass connected using linear springs to dissipate the earthquake energy. Different from those impact types of nonlinear energy sink (NES) which scatter the seismic energy in high frequency domains by instant impacts, the present BNES efficiently works with any impact avoided. e bistable property enhances the capacity of transient internal resonance capture of the BNES device in broadband. e essential working mechanism of the present BNES under seismic excitation can be attributed to the cascade of transient internal resonance. e strong robustness of the present BNES is due to the insensitivity of the broadband transient internal resonance to condition variation of the primary structure
Summary
Passive tuned mass dampers (TMDs) are efficient and lowcost devices to reduce the vibration response of structures. An NES is usually designed as a mass-spring-damper system attached to a primary structure, coupled with strongly nonlinear stiffness. To overcome the aforementioned drawbacks of the NES with smooth stiffness, the bistable NES (BNES) [21,22,23,24,25], which can lead to higher efficient energy absorption, is proposed. A magnetic BNES device, utilizing magnets and linear springs, is proposed. E result shows the present BNES is generally superior to the cubic NES and the TMD in both the ideally tuned and the detuned conditions The seismic behavior of the proposed BNES on a shear building is investigated. e performance of the BNES on a shear building is compared with the cubic NES and the TMD. e result shows the present BNES is generally superior to the cubic NES and the TMD in both the ideally tuned and the detuned conditions
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