Analysis and numerical modelling of eddy current damper for vibration problems

Irazu, Leire; Elejabarrieta, María Jesús

doi:10.1016/j.jsv.2018.03.033

Cited by 34 publications

(14 citation statements)

References 19 publications

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“…Lu et al [25] estimated the effectiveness and performance of the EC-TMD system by installing it on the top of a steel-frame model and performing shaking table tests, thus demonstrating the EC-TMD system was an excellent passive device forin suppressing vibrations under seismic excitation condtitions. Irazu et al [26] analyzed the damping characteristics of the eddy current and proposed a new inverse method to simulate its influences on mitigating the vibrations of a cantilever beam. Many researchers have tried to utilize EC-TMD systems to solve practical engineering problems in long-span structures and high-rise buildings.…”

Section: Introductionmentioning

confidence: 99%

Application of an Eddy Current-Tuned Mass Damper to Vibration Mitigation of Offshore Wind Turbines

et al. 2018

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Offshore wind turbine (OWT) structures are highly sensitive to complex ambient excitations, especially extreme winds. To mitigate the vibrations of OWT structures under windstorm or typhoon conditions, a new eddy current with tuned mass damper (EC-TMD) system that combines the advantages of the eddy current damper and the tuned mass damper is proposed to install at the top of them. In the present study, the electromagnetic theory is applied to estimate the damping feature of the eddy current within the EC-TMD system. Then, the effectiveness of the EC-TMD system for vibration mitigation is demonstrated by small-scale tests. Furthermore, the EC-TMD system is used to alleviate structural vibrations of the OWT supported by composite bucket foundations (CBF) under extreme winds at the Xiangshui Wind Farm of China. It is found that the damping of the EC-TMD system can be ideally treated as having linear viscous damping characteristics, which are influenced by the gaps between the permanent magnets and the conductive materials as well as the permanent magnet layouts. Meanwhile, the RMS values of displacements of the OWT structure can be mitigated by 16% to 28%, and the acceleration can also be reduced significantly. Therefore, the excellent vibration-reducing performance of the EC-TMD system is confirmed, which provides meaningful guidance for application in the practical engineering of OWTs.

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Section: Introductionmentioning

confidence: 99%

Application of an Eddy Current-Tuned Mass Damper to Vibration Mitigation of Offshore Wind Turbines

et al. 2018

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“…(11), it is taken into account that since the surface ΔS − k is close to the surface ΔS k , integration over area ΔS − k can be replaced by integration over area ΔS k . The system of Equation (11) replaces the system of Equation (1). Its distinctive feature is that it is obtained from the boundary condition written in integral form in Eq.…”

Section: Derivation Of a New System Of Linear Algebraic Equationsmentioning

confidence: 99%

“…Mathematical modeling of the distribution of eddy currents in conductive bodies of various geometries has a wide range of practical applications [1][2][3][4][5]. From the point of view of automation, as well as the possibility of studying both surface and subsurface defects, one of the most effective methods of nondestructive testing of conducting non-ferromagnetic samples is eddy current testing (ECT) [6,7].…”

Section: Introductionmentioning

confidence: 99%

Improving Efficiency of the Secondary Sources Method for Modeling of the Three-Dimensional Electromagnetic Field of Eddy Currents

Filippov¹,

Shuyskyy²

2019

PIER M

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A mathematical model is constructed for calculating a three-dimensional quasistationary electromagnetic field in a piecewise-homogeneous medium containing massive conductors which is excited by a variable magnetic field. The field is varying in time according to an arbitrary law. It is proposed to use the integral relation instead of the boundary condition written at a point, which allows one to get away from the problem of collocation points and at the same time increase the computational efficiency of the numerical model. The magnetic field is calculated for the case of the excitation of eddy currents in a conducting sample containing a cut of finite size. The results obtained are confirmed by natural experiments.

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“…In order to ensure the normal operation of equipment, various vibration isolation systems and vibration control technologies have been developed for vibration reduction and noise reduction of working machinery, stability control of precision measuring instrument and test bed, improvement of vehicle comfort, and so on [6,7]. In general, the vibration isolation systems can be divided into passive vibration isolation systems and active vibration isolation systems.…”

Section: Introductionmentioning

confidence: 99%

Vibration Control Method of an Electromagnetic Isolation System Based on LQR and Coevolutionary NGA

Zhang

Zhuan

2020

Shock and Vibration

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An electromagnetic isolation system can dynamically adjust the output characteristic parameters of the system in real time through the active control strategy, which has strong adaptability to the external environment. In order to control the electromagnetic vibration isolation system effectively, an active control method is presented based on the linear quadratic regulator (LQR) approach and the coevolutionary niche genetic algorithm (NGA). In this paper, the dynamical equation and state equation of the electromagnetic isolation system are built, which include the nonlinear relationship between electromagnetic force and coil current and gap. The LQR approach is employed to maintain a steady state of an isolated object on the vibration isolation system. Meanwhile, a coevolutionary niche genetic algorithm is put forward to optimize the parameters in Q and R matrices. Simulation and experimental results demonstrate that the electromagnetic isolation system with the LQR approach and coevolutionary NGA can effectively isolate the vibration and maintain a steady state for an isolated object in comparison with the passive isolation system.

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Analysis and numerical modelling of eddy current damper for vibration problems

Cited by 34 publications

References 19 publications

Application of an Eddy Current-Tuned Mass Damper to Vibration Mitigation of Offshore Wind Turbines

Application of an Eddy Current-Tuned Mass Damper to Vibration Mitigation of Offshore Wind Turbines

Improving Efficiency of the Secondary Sources Method for Modeling of the Three-Dimensional Electromagnetic Field of Eddy Currents

Vibration Control Method of an Electromagnetic Isolation System Based on LQR and Coevolutionary NGA

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