Analysis And Numerical Modelling Of Eddy Current Damper

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Analysis and numerical modelling of eddy current damper

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1. Introduction. The concept of eddy currents has been investigated since the late 1800s, and many researchers have proposed different uses of eddy currents for dynamic systems, such as braking systems, suppression of rotor vibration and damping of structural vibrations [].The main advantage of using the eddy current phenomenon to dampen structural …

1. 14
Publish Year: 2018
Author: L. Irazu, M.J. Elejabarrieta

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Analysis and numerical modelling of eddy current damper

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The dynamics of a contactless eddy current damper is studied from an experimental modal analysis in the bandwidth of 0–1 kHz. Vibration is attenuated in all the bandwidth without modifying the natural frequencies and mode shapes of the structure. A new modelling approach for contactless eddy current dampers is proposed based on an inverse method.

1. 14
Publish Year: 2018
Author: L. Irazu, M.J. Elejabarrieta

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Analysis and numerical modelling of eddy current damper

2 hours ago Ui.adsabs.harvard.edu Visit Site

Analysis and numerical modelling of eddy current damper for vibration problems. This work discusses a contactless eddy current damper, which is used to attenuate structural vibration. Eddy currents can remove energy from dynamic systems without any contact and, thus, without adding mass or modifying the rigidity of the structure.

1. 14
Publish Year: 2018
Author: L. Irazu, M.J. Elejabarrieta

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 See Also: Eddy Current Damper Simulation And Modeling

Experimental and Numerical Study on Dynamic Behavior …

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This study investigates the dynamic and nonlinear behavior of an eddy current (EC) damping mechanism by using shaking table tests and finite-element modeling. A noncontact and friction-free EC damper is firstly designed and tested, illustrating the existing frequency-dependent characteristic.

1. 1
Publish Year: 2020
Author: Zhiguo Shi, Jiazeng Shan, Cheng Ning Loong, Weichao Wu, Chih-Chen Chang, Weixing Shi

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920. Design and analysis of a novel eddy current damper

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920. DESIGN AND ANALYSIS OF A NOVEL EDDY CURRENT DAMPER BASED ON THREE-DIMENSIONAL TRANSIENT ANALYSIS. TIAN HE, DENGHONG XIAO, XIANDONG LIU, YINGCHUN SHAN 48 VIBROENGINEERING.JOURNAL OF VIBROENGINEERING.MARCH 2013.VOLUME 15, ISSUE 1.ISSN 1392-8716 By arranging the magnet this way, the radial …

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Experimental and Numerical Study on Dynamic Behavior …

6 hours ago Ascelibrary.org Visit Site

This study investigates the dynamic and nonlinear behavior of an eddy current (EC) damping mechanism by using shaking table tests and finite-element modeling. A noncontact and friction-free EC damper is firstly designed and tested, illustrating the existing frequency-dependent characteristic.

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(PDF) Analytical modeling of a simple passive

5 hours ago Researchgate.net Visit Site

The eddy current damping force in the damper is generated because of the motion of the PMS in the vicinity of a conductor. Numerical verification of …

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Design and analysis of a novel eddy current damper based

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With advantages of no mechanical contact, vacuum compatibility, oil-free, and high reliability, an eddy current damper has a great potential use in space. In this paper, a passive magnetic damper system is developed by using the eddy current damping effect. The proposed eddy current damper utilizes a stationary permanent magnet and two conductive plates, and has …

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Design of a vibration isolation system using eddy current

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Damper assembly model For magnetic dampers it is known that the coefficient of damping is proportional to the conductivity of the conductor and the square of flux density. Hence, the damper assembly is designed in such a way that it has minimum flux leakage and the copper body is chosen as the conductor to facilitate eddy current generation.

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(PDF) Design and Damping Analysis of a New Eddy Current

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In this paper, an analytical model based on the electromagnetic theory for this type of eddy current damper is proposed, and a finite-element analysis (FEA) …

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An Analytical 3-D Model for Calculating Eddy-Current

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An analytical solution for obtaining steady-state eddy-current-based force on a levitated permanent magnet above a plate with linear conductivity in the field of an electromagnet having cylindrical symmetry is presented in this paper. In literature, the force due to eddy current in this levitation system have been used for high precision positioning of a levitated permanent …

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Physical Modeling Mechanical - New York University

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Physical Modeling - Mechanical K. Craig 27 Eddy-Current Damper • Motion of the conducting cup in the magnetic field generates a voltage in the cup. • A current is generated in the cup’s circular path. • A current-carrying conductor in a magnetic field experiences a force proportional to the current. • The result is a force

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Evaluation of eddy current damper for vibration control of

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In this study, an eddy current damper (ECD) prototype model is presented. The ECD consists of three principal components: Neodymium Iron Boron (NdFeB) permanent magnets, a copper plate (conductive material) and an aluminium frame.

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Design and Fabrication of Eddy Current Damper

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By using the concept of eddy current for damping purposes majority of research in eddy current damping has taken place [6]. Fig -1: Schematic of conductive material passing through a magnetic field and the generation of eddy currents [8]. 2. AIM AND OBJECTIVES 2.1 Aim The aim of the project is to design and fabricate eddy current damper.

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Eddy current damper feasibility in automobile suspension

4 hours ago Iopscience.iop.org Visit Site

In this paper, a scaled-down passive eddy current damper (ECD) is developed by using the eddy current damping phenomenon. An analytical model for the generated damping force is derived by applying the electromagnetic equations. Then, the proposed ECD geometry is optimized and the final configuration is simulated, using FE software.

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EXPERIMENTAL AND NUMERICAL ANALYSIS OF MR DAMPERS

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rent dependent, which considerably increases the difficulty level when a numerical model is developed. To use the MR damper as a controllable semi-active device into a control system it is es-sential that the selected numerical model can capture its non-linear behavior in order to devel-op a feasible semi-active controller [3-6].

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Interdependence of Hysteresis and Eddy-Current Losses in

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Based on the results of a numerical model developed for the analysis, the magnetodynamic loss phenomena are found to be distinctly interdependent. Because of the effects of eddy currents on the flux distribution in the lamination depth, hysteresis and excess losses show a dependence on eddy currents, and hence, on the excitation frequency.

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Experimental Tuned Mass Damper Based on Eddy Currents

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2. Eddy currents Tuned Mass Damper When a conductive material moves along a stationary magnetic field, eddy currents are induced, (Figure 1.a). By neglecting the surface charge in the conductive plate, the eddy currents density can be written as: J v B uV() (1) where V is the electrical conductivity of the conductive material, ()T v vz is the

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Finite Element Analysis of Magneto-Rheological Damper

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TABLE II MAGNETIC FLUX DENSITY OF FEM MODEL OF MR DAMPER PROTOTYPE Current (A) Magnetic Flux Density- FEM Model (Tesla) 0.1 0.053 0.2 0.106 0.3 0.158 0.4 0.211 0.5 0.264 0.6 0.317 0.7 0.370 III. CALCULATION OF THE TOTAL DAMPING FORCE The damping force for the FEM modeling is calculated using the magnetic flux density as determined at different

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Development of Novel Eddy Current Dampers for the

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Development of Novel Eddy Current Dampers for the Suppression of Structural Vibrations Henry A. Sodano Abstract The optical power of satellites such as the Hubble telescope is directly related to the size of the

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Sundaria, Ravi; Rasilo, Paavo; Belahcen, Anouar; Arkkio

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task in the numerical analysis of electrical machines. For estimation of eddy current losses, various formulations based on 1-D and 2-D models are mentioned in literature which neglect effect of current density at the edges of steel laminations. This paper compares such simplified 1-D/2-D eddy current loss model with a

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ME 7327 Mechanical Vibration

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Module 3: Damped Free vibration analysis of a single dof system, different types of damping used in practice (viscous damping, eddy current damping, structural damping, dry friction damping, non contact damping), Solution of free vibration with damping (viscous damping) in a single dof system,

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Design of eddy current dampers for vibration suppression

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The designed eddy current dampers are installed on the milling spindle to damp the tool tip vibrations. The structural design and the working principle of the eddy current dampers are explained. The magnetic flux density distribution and the magnetic force generation of the designed eddy current damper are analyzed with the finite element method.

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Investigations of eddy current vibration damping

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found by the FEA analysis to maximise the damping forces (see below). The measured damping (c) due to eddy current effect was approximately 6.8 N∙s/m. The FEA model was configured with the same parameters as in the test configuration and analysed. The results shown below in Figure 4 indicate that maximum damping is achieved at a location when

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Advances in Structural Engineering - ScienceGate

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This study proposes an equivalent circuit model to simulate the mechanical behavior and frequency-dependent characteristic of eddy current (EC) damping, with the validations from multi-physics finite element (FE) modeling and dynamic testing. The equivalent circuit model is first presented with a theoretical expression of the EC damping force.

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The Damper Spring Unit of the Sentinel 1 Solar Array

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The Damper Spring Unit (DSU, see Figure 1) has been designed to provide the damping required to control the deployment speed of the spring driven solar array deployment in an ARA Mk3 or FRED based Solar Array in situations where the standard application of a damper at the root-hinge is not feasible. The unit consists of four major parts: a main bracket, an eddy

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A passive electromagnetic eddy current friction damper

2 hours ago Onlinelibrary.wiley.com Visit Site

The focus of this paper is on analytical modeling of a novel type of passive friction damper for seismic hazard mitigation of structures. The proposed seismic damping device, which is termed as passive electromagnetic eddy current friction damper, utilizes a solid-friction mechanism in parallel with an eddy current damping mechanism to maximize the dissipation …

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Damping problem in the undamped vibration analysis of a

6 hours ago Comsol.com Visit Site

I'm working on modeling of eddy current damping effects on the vibration of conducting cantilevered beams. I want to compare the case in which eddy current damper is active to the case in which there is no damping in the material of beam. I know it will be just theoretical but I think it will be much impressive in the plots when comparing the

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Eddy current loss and its magnetization effect of

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L. Irazu and M.J. Elejabarrieta, Analysis and numerical modelling of eddy current damper for vibration problems, Journal of Sound and Vibration 426 (2018), 75–89. [10] J. Edwards, B. Jayawant, W. Dawson and D. Wright, Permanent-magnet linear eddy-current brake with a non-magnetic reaction plate, IEE Proceedings-Electric Power Applications 146

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Eddy Current Dampers - Avior Control Technologies, Inc

6 hours ago Aviorcontrols.com Visit Site

2000 Pike Road, Unit B Longmont, CO 80501 (Tel) 720-491-3708

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 See Also: Numerical Modelling And Experimental Testing Of Eddy

A novel eddy current damper: theory and experiment - NASA/ADS

2 hours ago Ui.adsabs.harvard.edu Visit Site

A novel eddy current damper is developed and its damping characteristics are studied analytically and experimentally. The proposed eddy current damper consists of a conductor as an outer tube, and an array of axially magnetized ring-shaped permanent magnets separated by iron pole pieces as a mover. The relative movement of the magnets and the conductor causes …

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CN110182326A - It is a kind of with the semi-submersible

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The invention belongs to floating offshore wind-driven generator correlative technology fields, it discloses a kind of with the semi-submersible type wind-power electricity generation machine platform for subtracting vibration isolation function, the generator platform includes support construction, damping component and flexural pivot, the support construction is upper and …

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An accurate and efficient three‐dimensional high‐order

2 hours ago Onlinelibrary.wiley.com Visit Site

These eddy currents, As a first approximation to damping effects, the simple case of proportional damping is considered. In this model, a damping block is added to in the system 24, where α M is the mass proportional damping coefficient, In order to ensure that the current source is divergence free, a mapping of the current source to

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Computer modeling of electromagnetic edge containment in

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OSTI.GOV Conference: Computer modeling of electromagnetic edge containment in twin-roll casting Title: Computer modeling of electromagnetic edge containment in twin-roll casting Full Record

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Guan, Weimin - onAcademic

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Numerical Analysis of Electromagnetic Force on Magnetic Nanoparticles in Fluid Guan, Weimin Fang, Fuxin Kong, Haiyang Guan, Huanmei In this paper, the nanoparticles are ferromagnetic and have charge density on the surface, and the magnetic force is coupled with the Lorentz force.

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SIAM Journal on Matrix Analysis and Applications

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(2018) Axial-field eddy-current coupling: a 3D test problem for numerical experiments. International Journal of Numerical Modelling: Electronic Networks, Devices and Fields 31 :2, e2217. (2018) High-order Padé and singly diagonally Runge-Kutta schemes for linear ODEs, application to wave propagation problems.

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Welcome to LS-DYNA Examples

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The site presents approximately 500 LS-DYNA examples from various training classes. The input files and several class notes are available for download. The download is free of charge, a login is not required. All examples are presented with a brief description. You may find an example by checking a specific class or by using the search functionality of the site.

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Damping Factor! - COMSOL

4 hours ago Comsol.com Visit Site

Hi there are a couple of possible "damping factors" in any FEM calculation, the "numerical" ones to be sure your calculations converge, and in your case you might have motion induced "Eddy current" damping, if you have the correct physics active: bacause in any conductor that is moving in a static magnetic field (or the opposite, or both) will see a current

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صفحه رسمی یوسف حجت

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دکتر یوسف حجت استاد دانشکده مهندسی مکانیک دانشگاه تربیت مدرس است. او در سال 1335 در تهران متولد شد.

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Frequently Asked Questions

What is the damper configuration?

The damper configuration con- sists of a copper tube as a conductor and an array of permanent magnets and iron pole pieces as the moving elements. Ebrahimi et al.14analyzed a passive eddy current damper using different configurations of permanent magnets by using magnets magnetized in axial and radial directions.

Can active–passive eddy current damper be used for vibration isolation?

Further, a theoretical model for an active isolation system is proposed in order to reduce the transmissibility at resonance. It is envisaged that the combined active–passive eddy current damper could be effectively used for vibration isolation.

How is an eddy current induced?

An eddy current is induced by spinning a thin aluminum disc between the poles of an electromagnet and the accuracy is validated by a theoretical model. Control techniques have been used to adjust the damping force obtained from traditional damping systems.

Why is copper used as a conductor in magnetic dampers?

For magnetic dampers it is known that the coefficient of damping is proportional to the conductivity of the conductor and the square of flux density. Hence, the damper assembly is designed in such a way that it has minimum flux leakage and the copper body is chosen as the conductor to facilitate eddy current generation.

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