NES cell

Abstract

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

Dynamics analysis and parameter optimization of a nonlinear energy sink with geometrically nonlinear inerters

“…Kong et al [7,8] studied the dynamics of 1-dof and 2-dof NES with geometrically nonlinear damping, the incorporation of this type of damping into the NES absorber system enhances vibration absorption signi cantly. Several traditional cubic NESs can be integrated in series [9][10][11] or parallel [12][13][14][15] in order to optimize the vibration absorption capabilities, and it was revealed that they exhibit superior performance when compared to single-degree-of-freedom (SDOF) NESs of equal mass. However, the ability of NES to absorb vibration can also be greatly affected by variations in its initial energy, and may even fail under excessive input energy that forms a frequency island.…”

A vertical track nonlinear energy sink

“…In recent years, many scholars have studied and extended the applications of NESs [26][27][28] , and many types of NESs have been proposed, e.g., limited NESs [29][30][31] , inertial NESs [32][33] , lever-type NESs [34] , multi-stable NESs [21,35] , track NESs (TNESs) [36][37] , and NES cells [38] . In addition, many research methods and experiments have been developed to evaluate the vibration control effect of NESs.…”

A viscoelastic nonlinear energy sink with an electromagnetic energy harvester: Narrow-band random response

“…[12][13][14] Some scholars have explored the possibility of achieving enhanced vibration reduction by increasing the number of NES units. [15] Ding et al [16] firstly put forward the concept of NES cell and have improved the reliability of NES and its versatility to complex vibration structures by adding a large number of NES cells in parallel. Additionally, considerable attention has been devoted to studying the dynamic response of systems coupled with NESs under conditions of random or harmonic excitation.…”