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Technical Brief

Asymmetric Magnet-Based Nonlinear Energy Sink

[+] Author and Article Information
Mohammad A. AL-Shudeifat

Aerospace Engineering,
Khalifa University of Science,
Technology & Research,
Abu Dhabi 127788, United Arab Emirates
e-mail: mohd.shudeifat@kustar.ac.ae

Manuscript received August 23, 2013; final manuscript received April 16, 2014; published online October 13, 2014. Assoc. Editor: D. Dane Quinn.

J. Comput. Nonlinear Dynam 10(1), 014502 (Oct 13, 2014) (4 pages) Paper No: CND-13-1205; doi: 10.1115/1.4027462 History: Received August 23, 2013; Revised April 16, 2014

The nonlinear energy sink (NES) is a light-weighted device used for shock mitigation in dynamic structures through its passive targeted energy transfer (TET) mechanism. Here, a new design for the NES is introduced based on using an asymmetric NES force. This force is strongly nonlinear in one side of the NES equilibrium position, whereas it is either weakly nonlinear or weakly linear in the other side. This is achieved by introducing the asymmetric magnet-based NES in which the asymmetric nonlinear magnetic repulsive force is generated by two pairs of aligned permanent magnets. Consequently, this proposed design is found to provide a considerable enhancement in the shock mitigation performance compared with the symmetric stiffness-based NESs for broadband energy inputs.

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Topics: Magnets , Stiffness , Design
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Figures

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Fig. 1

The proposed design of the magnetic nonlinear energy sink

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Fig. 2

Schematic diagrams for the side view of the magnetic NES components

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Fig. 8

(a) Time histories of the LO displacement; (b) the NES relative displacement; and (c), (d) their corresponding wavelet transforms for initial velocity of 0.3 m/s of the LO

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Fig. 7

Symmetric and asymmetric magnet-based NESs forces

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Fig. 6

(a) Time histories of the LO displacement; (b) the NES relative displacement; and (c), (d) their corresponding wavelet transforms for initial velocity of 0.1 m/s of the LO

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Fig. 5

Percentage of the dissipated energy by the NES for different initial input velocities of the LO

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Fig. 4

Asymmetric magnetic NES design

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Fig. 3

(a) The magnetic NES configuration; (b) the single degree-of-freedom linear oscillator of mass M attached to the NES of mass m

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