Journal ArticleDOI
Improved Concept and Model of Eddy Current Damper
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In this article, an improved theoretical model of the previously developed system was formulated using the image method, thus allowing the eddy current density to be more accurately computed in addition to the development, modeled, and tested.Abstract:
When a conductive material experiences a time-varying magnetic field, eddy currents are generated in the conductor These eddy currents circulate such that they generate a magnetic field of their own, however the field generated is of opposite polarity, causing a repulsive force The time-varying magnetic field needed to produce such currents can be induced either by movement of the conductor in the field or by changing the strength or position of the source of the magnetic field In the case of a dynamic system the conductor is moving relative to the magnetic source, thus generating eddy currents that will dissipate into heat due to the resistivity of the conductor This process of the generation and dissipation of eddy current causes the system to function as a viscous damper In a previous study, the concept and theoretical model was developed for one eddy current damping system that was shown to be effective in the suppression of transverse beam vibrations The mathematical model developed to predict the amount of damping induced on the structure was shown to be accurate when the magnet was far from the beam but was less accurate for the case that the gap between the magnet and beam was small In the present study, an improved theoretical model of the previously developed system will be formulated using the image method, thus allowing the eddy current density to be more accurately computed In addition to the development of an improved model, an improved concept of the eddy current damper configuration is developed, modeled, and tested The new damper configuration adds significantly more damping to the structure than the previously implemented design and has the capability to critically damp the beam 's first bending mode The eddy current damper is a noncontacting system, thus allowing it to be easily applied and able to add significant damping to the structure without changing dynamic response Furthermore, the previous model and the improved model will lie applied to the new damper design and the enhanced accuracy of this new theoretical model will he provenread more
Citations
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Journal ArticleDOI
Variable impedance actuators: A review
Bram Vanderborght,A. Albu-Schaeffer,Antonio Bicchi,Antonio Bicchi,Etienne Burdet,Darwin G. Caldwell,Raffaella Carloni,Manuel G. Catalano,Manuel G. Catalano,Oliver Eiberger,Werner Friedl,Gowrishankar Ganesh,Manolo Garabini,Markus Grebenstein,Giorgio Grioli,Sami Haddadin,Hannes Höppner,Amir Jafari,Matteo Laffranchi,Dirk Lefeber,Florian Petit,Stefano Stramigioli,Nikos G. Tsagarakis,M. Van Damme,R. Van Ham,L. C. Visser,Sebastian I. Wolf +26 more
TL;DR: A classification based on the principles through which the variable stiffness and damping are achieved is proposed and allows for designers of new devices to orientate and take inspiration and users of VIA's to be guided in the design and implementation process for their targeted application.
Journal ArticleDOI
Eddy Current Damping in Structures
Henry A. Sodano,Jae-Sung Bae +1 more
TL;DR: There are several different methods of inducing a time-varying magnetic field, and from each method arises the potential for a different type of damping system as mentioned in this paper, which can be applied to a variety of different structural systems in a number of distinct ways.
Journal ArticleDOI
Design and modeling of a magnetic shock absorber based on eddy current damping effect
TL;DR: In this paper, a self-powered magnetic spring-damper is proposed, which utilizes two permanent magnets and a conductive aluminum plate to generate both spring and variable damping effects.
Journal ArticleDOI
Eddy current damper feasibility in automobile suspension: modeling, simulation and testing
TL;DR: In this paper, a novel eddy current damper (ECD) is proposed for vehicle suspension systems, which utilizes permanent magnets (PMs), separated by iron poles that are screwed to an iron rod, and a conductive hollow cylinder to generate damping.
Journal ArticleDOI
Vibration suppression of a cantilever beam using magnetically tuned-mass-damper
TL;DR: In this paper, an improved concept of the tuned mass damper for the vibration suppression of structures is introduced, which consists of the classical tuned massdamper and an eddy current damping.
References
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Book
Field and wave electromagnetics
TL;DR: In this article, the authors consider boundary value problems in Cylindrical Coordinates and present a solution to the problem of boundary addition and subtraction in Cartesian Coordinates.
Journal ArticleDOI
Concept and model of eddy current damper for vibration suppression of a beam
TL;DR: In this paper, a new electromagnetic damping mechanism is introduced, which is different from previously developed electromagnetic braking systems and eddy current dampers because the system investigated in the subsequent manuscript uses the radial magnetic flux to generate the electromagnetic dampening force rather than the flux perpendicular to the magnet's face as done in other studies.
Journal ArticleDOI
A unified matrix polynomial approach to modal identification
TL;DR: In this paper, a unified matrix polynomial approach (UMPA) is used to unify the presentation with respect to current algorithms such as the least-squares complex exponential (LSCE), the polyreference time domain (PTD), Ibrahim time domain, eigensystem realization algorithm (ERA), rational fraction polynomials (RFP), polyreference frequency domain (PFD), and the complex mode indication function (CMIF) methods.
Journal ArticleDOI
Permanent magnet linear motors used as variable mechanical dampers for vehicle suspensions
TL;DR: In this paper, a coreless design appropriate for use with high energy permanent magnets is proposed which would significantly reduce the weight of the units, and the results indicate that for the oscillation freauencies tvoicallv encountered in road vehicle suspensions, electrodynamic variable shock absorbers are feasible.
Journal ArticleDOI
Magnetic braking: Simple theory and experiment
TL;DR: In this article, a simple theory of magnetic braking in a thin metal strip is proposed and the predictions of the model are compared to experiment and good agreement is obtained. But the experimental tests were conducted by spinning a thin aluminum disk of large radius between the pole pieces of an electromagnet.