In addition, it improves the reliability of NES applications. Therefore, the lightweight NES cell is flexible for vibration control of complex structures. In summary, the mode of the primary structure can be efficiently controlled by a large number of lightweight NES cell. In addition, the effect of the distribution of NES cells on the multi-mode resonance suppression of the beam is also studied. The relationship between the vibration suppression effect of NES cells and the number of NES cell is studied. An elastic beam is used as the primary vibration structure, and a limited NES is used as the cell. By applying a large number of NES cells in parallel, the reliability of NES and its versatility to complex vibration structures are improved. The advantages of the adaptive vibration control of NES are applied to cellular NES. Therefore, this paper proposes the concept of NES cell. In addition, the performance of NES depends on its mass ratio of the primary system, and NES lacks versatility for different vibration systems. The low reliability of NES has hindered its application in engineering. As a result, the reliability of NES is not high. Besides, it is difficult to realize pure nonlinear stiffness without the linear part. However, targeted energy transfer may cause severe vibration of NES. The high vibration damping performance of nonlinear energy sink (NES) has attracted attention. In a word, the proposed non-contact ME-NES is a reliable and efficient vibration reduction strategy, which is helpful to the design of the NES in engineering practice.Ī broadband adaptive vibration control strategy with high reliability and flexible versatility is proposed. The vibration of the NES mass is evidently reduced, and the vibration suppression of the NES is significantly enhanced by the limitation of the nonlinear magnetic force. The results show that the limiting effect of nonlinear magnetic force is better than that of linear force.

The effects of nonlinear magnetic force, magnetic spacing, and magnetic field strength on the vibration of the NES oscillator and the LO are summarized. The transient response and steady-state response of the LO with the ME-NES are investigated. Moreover, the experiment of the ME-NES is carried out to verify the theoretical results. The dynamic characteristics of the ME-NES are analyzed by approximate analytical and numerical simulations. Based on the magnetic force expression of permanent magnets, a dynamic equation of a linear oscillator (LO) equipped with the magnetic-enhanced NES (ME-NES) is established. In order to improve the reliability of the nonlinear energy sink (NES), a nonlinear, non-contact magnetic force is proposed to limit the large vibration of the NES oscillator in this paper.

Time sink energy