Galloping suppression of a suspended cable with wind loading by a nonlinear energy sink

The nonlinear energy sink (NES) is defined as a single-degree-of-freedom structural element with relatively small mass and weak dissipation, attached to a primary structure via essentially nonlinear coupling. It is a passive energy dissipation device designed to rapidly absorb vibration energy (due to shock, blast, earthquakes, etc.) from a primary structure and locally dissipate it. The article contains a mini-review of the works on NESs. Design schemes for single-sided and double-sided vibro-impact NESs (SSVI and DSVI NESs) are proposed on the basis of conceptual and design NES schemes that exist in the world scientific literature. The motion equations and the impact rule are given. The quasistatic Hertz contact law is adopted as the impact rule. Various representations of the impulsive loading on the primary structure are discussed. These are excitations by initial velocities only, periodic excitation, a shock in the half-sine form, single-sided periodic impulses of a rectangular shape,wind, seismic and broadband excitation. The Tables of some numerical parameters that can be accepted for VI NES are given. Using the presented data, the authors intend to investigate both the efficiency of SSVI and DSVI NESs under different types of impulsive load, and their dynamical behavior with the changing in their parameters.

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“…11, 12, 13, 14. In [31], the mitigation of cable vibrations caused by wind loading is studied. NES is used for this purpose.…”

Section: Broadband Excitationsmentioning

confidence: 99%

Choice of the Model for Vibro-impact Nonlinear Energy Sink

Lizunov

Pogorelova

Postnikova

2022

OMTC

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“…6 Shock and Vibration Substituting (19) into (18) and setting the coefficients of powers of equal to zero, the following equations are obtained:…”

Section: Strongly Modulated Responses Of the Rotor System With The Nesmentioning

confidence: 99%

“…In vibration suppression application, the NESs have been applied on beams and cables [18,19], machine tool [20,21], steel frames [22], and so on. In rotating systems, many types of NES have been developed and applied.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Nonlinear Energy Sink for Vibration Attenuation of Unbalanced Rotor System

Yao

Zheng

Wen

2017

Shock and Vibration

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A novel nonlinear energy sink (NES) consisting of permanent magnetic springs and coil springs is proposed, and the vibration attenuation performance of the NES for unbalanced rotor system is investigated. Firstly, the nonlinearity of the magnet spring is analyzed and the structure of the NES is introduced. Then, the dynamic model of the rotor system with the NES is built, and the responses and stabilities of the system are studied by applying Complexification-averaging method. The strongly modulated responses (SMR) behavior, which is the most important performance characteristic of the NES, is analytically studied by combining Complexification-averaging method and multiscale method and numerically verified by Runge-Kutta method. The results show that the NES is effective in attenuating the vibration of unbalanced rotor, and the SMR occurrence range can be broadened by increasing the nonlinearity of the NES. And also, the NES has better performance over a wider frequency range than the linear absorber.

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“…The first calls for augmenting the galloping structure with an additional oscillator, which serves as a passive energy sink. Examples of these sinks are the linear tuned mass damper (Stockbridge damper) [4], the tuned liquid damper (nutation damper) [12], the impact damper [13] and the nonlinear energy sink [14]. When properly designed, energy sinks are very effective in suppressing galloping oscillations, but the additional weight penalty and frequency matching requirement limit their implementation in many environments.…”

Section: Introductionmentioning

confidence: 99%

Suppression of galloping oscillations by injecting a high-frequency excitation

Alhadidi

Khazaaleh

Daqaq

2021

Phil. Trans. R. Soc. A.

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Galloping is an aeroelastic instability which incites oscillatory motion of elastic structures when subjected to an incident flow. Because galloping is often detrimental to the integrity of the structure, many research studies have focused on investigating methodologies to suppress these oscillations. These include using passive energy sinks, altering the surface characteristics of the structure, actively changing the shape of the boundary layer through momentum injection and using feedback control algorithms. In this paper, we demonstrate that the critical flow speed at which galloping is activated can be substantially increased by subjecting the galloping structure to a high-frequency non-resonant base excitation. The average effect of the high-frequency excitation is to produce additional linear damping in the slow response which serves to suppress the galloping instability. We study this approach theoretically and demonstrate its effectiveness using experimental tests performed on a galloping cantilevered structure. It is demonstrated that the galloping speed can be tripled in some experimental cases. This article is part of the theme issue ‘Vibrational and stochastic resonance in driven nonlinear systems (part 2)’.

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Galloping suppression of a suspended cable with wind loading by a nonlinear energy sink

Cited by 28 publications

References 28 publications

Choice of the Model for Vibro-impact Nonlinear Energy Sink

Choice of the Model for Vibro-impact Nonlinear Energy Sink

Magnetic Nonlinear Energy Sink for Vibration Attenuation of Unbalanced Rotor System

Suppression of galloping oscillations by injecting a high-frequency excitation

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