Dynamic behavior of thin plates under impulsive magnetic field

Tani, Junji; Minagawa, Masakazu; Ohtomo, Kikuo; Saigo, Magumi

doi:10.1109/20.106374

Cited by 8 publications

(3 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Many authors have studied the effect of a conductive beam or plate subjected to a strong magnetic field. Tani et al (1990) numerically determined the dynamic behavior of thin conductive plates with a crack under both impulsive and continuous magnetic fields generated by an electromagnet positioned a small distance perpendicular to the surface of the plate. They showed that when the impulsive magnetic field is applied to the structure, it begins to vibrate, and through experiments the finite element code was shown to produce results with fair agreement.…”

Section: Eddy Current and Magnetic Damping Of Vibrationsmentioning

confidence: 99%

Eddy Current Damping in Structures

Sodano

Bae

2004

The Shock and Vibration Digest

109

View full text Add to dashboard Cite

When a conductive material is subjected to a time-varying magnetic flux, eddy currents are generated in the conductor. These eddy currents circulate inside the conductor generating a magnetic field of opposite polarity as the applied magnetic field. The interaction of the two magnetic fields causes a force that resists the change in magnetic flux. However, due to the internal resistance of the conductive material, the eddy currents will be dissipated into heat and the force will die out. As the eddy currents are dissipated, energy is removed from the system, thus producing a damping effect. 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. Therefore, the research into eddy current and magnetic damping mechanisms has led to a diverse range of dampers, many of which are detailed in this paper. The majority of the research in eddy current damping has taken place in the area of magnetic braking. A second topic that has received significant interest is the use of eddy current dampers for the suppression of structural vibrations. However, much of this research is not concentrated in one area, but has been applied to a variety of different structural systems in a number of distinct ways. In this paper, we review the research into various types of eddy current damping mechanisms and we discuss the future of eddy currents with some potential uses that have not yet been studied.

show abstract

Section: Eddy Current and Magnetic Damping Of Vibrationsmentioning

confidence: 99%

Eddy Current Damping in Structures

Sodano

Bae

2004

The Shock and Vibration Digest

109

View full text Add to dashboard Cite

show abstract

“…The use of an electromagnet with a time changing current to induce eddy currents has been previously studied, but only in the context to see the structural response of a system subjected to the changing field. For instance, Tani et al [11], Morisue [12], Tsuboi et al [13], Takagi et al [14] and Takagi and Tani [15] have all analyzed the response of a conducting plate subjected to impulsive magnetic fields. Each of these researchers has applied upwards of 1000 amps to an electromagnet and predicted the dynamic response.…”

Section: Introductionmentioning

confidence: 98%

Experimental validation of an active eddy current vibration control scheme

Sodano

Inman

2006

Smart Structures and Materials 2006: Modeling, Signal Processing, and Control

View full text Add to dashboard Cite

When a conductive material is subjected to a time changing magnetic field, eddy currents are formed in the conductor. These currents circulate inside the conductor such that a magnetic field is formed. This eddy current field then interacts with the applied field resulting in a dynamic force between the conductor and the magnetic source. The force can be considered dynamic because as the eddy currents circulate inside the conductor they are dissipated by the internal resistance of the conductor. Therefore, if a continuously changing field is not applied to the conductor the force will disappear. However, the eddy current forces can be utilized to form an actuator by applying a time changing current to an electromagnet that is in close proximity to a conductive material. This actuation method is easy to incorporate into the system and allows significant forces to be applied without every coming into contact with the structure. Therefore vibration control can be applied without inducing mass loading or added stiffness, which are downfalls of other methods. This manuscript will develop the concept and show that it can be accurately modeled and effectively used to control the vibration of a structure. This vibration control system will use a velocity feedback filter to actively modify the current applied to the coil. Using this system, experiments are performed on a cantilever beam showing the system can effectively suppress the each of the first five modes of vibration by upwards of 20dB.

show abstract

“…Based on [12], we can conclude that both the magnetic field intensity and the induced eddy current in the substrate increase linearly with the exciting current in the spiral inductor for both layers. As such, there exists a mutual coupling factor, which is denoted as M in Fig.…”

Section: Introductionmentioning

confidence: 88%

A novel circuit model for two-layer spiral inductor with Eddy current effects

Leong

The Ninth International Conference onCommunications Systems, 2004. ICCS 2004.

View full text Add to dashboard Cite

In this paper, an improved two layered spiral inductor lumped-element circuit model, which takes into account the effect of eddy current within the silicon substrate, is proposed. Physical explanation on the modifications of the circuit is given. Compared to the conventional model, our proposed model provides a better agreement between the simulated and measured responses for a sample of circular spiral inductors fabricated using silicon substrate.

show abstract

Dynamic behavior of thin plates under impulsive magnetic field

Cited by 8 publications

References 2 publications

Eddy Current Damping in Structures

Eddy Current Damping in Structures

Experimental validation of an active eddy current vibration control scheme

A novel circuit model for two-layer spiral inductor with Eddy current effects

Contact Info

Product

Resources

About