Modeling and Measurements on a Finite Rectangular Conducting Plate in an Eddy Current Damper

Pluk, K. J. W.; Beek, T. A. van; Jansen, J.W.; Lomonova, E. A.

doi:10.1109/tie.2013.2279364

Cited by 50 publications

(24 citation statements)

References 25 publications

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“…According to [60,61], a vertical force is often modelled as a sum of a static and a dynamic component as Equation (16).…”

Section: Case Studymentioning

confidence: 99%

“…In order to verify the effect of semi-active ECTMD further, human-induced vibrations of 1.8 Hz, 2.0 Hz and 2.2 Hz are simulated. According to [60,61], a vertical force is often modelled as a sum of a static and a dynamic component as Equation (16 The comparisons of structural response under 2.0 Hz walking, running and jumping excitations are shown in Figure 13. The detailed results of the harmonic and human-induced excitation simulations are shown in Table 6.…”

Section: Case Studymentioning

confidence: 99%

“…Eddy current in the conductive plate is induced by the relative motion between the permanent magnet and the conductive plate [16,17]. The Lorentz force in the conductive plate will hinder the relative motion, and the vibration energy is dissipated by the heat of the conductive plate.…”

Section: Introductionmentioning

confidence: 99%

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Study on Adaptive-Passive and Semi-Active Eddy Current Tuned Mass Damper with Variable Damping

et al. 2018

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Tuned mass damper (TMD) is a widely used vibration control device, consisting of a mass, some springs and damping elements. Viscous damper is mostly used as a damping element; however, it has many unsustainable problems, e.g., poor durability, sensitive to the change of temperature, difficult to adjust the damping, oil leakage etc. In this paper, a new sustainable adaptive-passive eddy current tuned mass damper (ECTMD) with variable damping, which is very easy to be further upgraded to a semi-active one, is proposed. Four important parameters, e.g., adsorption position of permanent magnets, thickness of the conductive plate, thickness of the extra steel plate and the air gap between permanent magnets and the conductive plate are investigated by a parametric study. Two new evaluation indexes are put forward to indicate the damping mechanism of the proposed device. The relationship between effective damping coefficient and air gap is fitted through a quadratic function. Then, the corresponding design method of the proposed adaptive-passive ECTMD is presented. At last, the previous adaptive-passive ECTMD is upgraded to a semi-active one, which can adjust its eddy current damping through adjusting its air gap in real-time, based on the linear-quadratic-Gaussian algorithm. The effectiveness of semi-active ECTMD is evaluated through harmonic excitations and human-induced excitations. The results show that the semi-active ECTMD with variable damping has a better vibration control effect than the optimized passive one.

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“…According to [60,61], a vertical force is often modelled as a sum of a static and a dynamic component as Equation (16).…”

Section: Case Studymentioning

confidence: 99%

Section: Case Studymentioning

confidence: 99%

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Study on Adaptive-Passive and Semi-Active Eddy Current Tuned Mass Damper with Variable Damping

et al. 2018

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“…Other recent interesting applications of the quasi-stationary 3D FEM-simulations for eddy currents include models of magnetic brakes [16] and in electromagnetical dampers [6]. An analytical model has been compared with the 3D time-dependent solution for an eddy current linear damping plate [11]. Solid pole electric machines have been analyzed with 2D time-dependent solutions [14].…”

Section: Introductionmentioning

confidence: 99%

Eddy currents in a passive magnetic axial thrust bearing for a flywheel energy storage system

Hedlund¹,

Abrahamsson²,

Perez-Loya³

et al. 2017

JAE

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Abstract. Two types of passive magnetic lift bearings were evaluated in terms of thrust force and eddy current losses. The first type of bearings were based on two sets of segmented Halbach arrays mounted in repulsive mode, and the second type was based on ring-magnets. The eddy-currents studied arose in the bearing due to manufacturing variations of magnetic remanence, and due to non-radial magnetization. Both a 3D time-dependent and a quasi-stationary Finite-Element Method (FEM) formulation were used, and the simulated results were compared with lift-force measurements from experiment. The losses were found (by FEM) to be in the order of 25 W at a rotational speed of 30000 rpm while lifting a 45 kg rotor with a stiffness of 359 N/mm.

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“…21 The other is passive MD, and various kinds of passive MDs have been presented. [22][23][24][25][26][27] For example, in Laborenz et al, 23 two types of passive eddy current dampers were investigated for the damping of turbine blade vibrations. In Cheng and Oh, 24 an electromagnetic shunt damper was newly developed to passively suppress the vibration of flexible beams.…”

Section: Introductionmentioning

confidence: 99%

An integrated passive magnetic damping system for high-speed compressor with flexible rotor

Fang

Sun

2014

Proceedings of the Institution of Mechanical Engineers, Part C:

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To provide a more reliable rotor damping system for high-speed compressor with flexible rotor, a passive magnetic damping integrated with an active axial bearing (PMDAB) system is proposed. The PMDAB system can provide active force in axial direction and also can provide damping force without control system in radial direction. To enhance the damping ability of the system, an analytical model is set up especially for the high-speed vibration rotor, and the relation between resistance of radial coils and the provided damping force is discussed for the first time. The coupling characteristic between passive radial damping coefficient and active axial bearing stiffness is also analyzed; the result shows that the coupling is too small, therefore can be neglected. Finally, a design example for a high-speed compressor is given based on electromagnetic analysis of PMDAB and dynamic analysis of the flexible rotor. The analytical and design results, which are verified by the finite element method result, show that the PMDAB is effective in controlling the first bending vibration of flexible rotor.

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Modeling and Measurements on a Finite Rectangular Conducting Plate in an Eddy Current Damper

Cited by 50 publications

References 25 publications

Study on Adaptive-Passive and Semi-Active Eddy Current Tuned Mass Damper with Variable Damping

Study on Adaptive-Passive and Semi-Active Eddy Current Tuned Mass Damper with Variable Damping

Eddy currents in a passive magnetic axial thrust bearing for a flywheel energy storage system

An integrated passive magnetic damping system for high-speed compressor with flexible rotor

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