Application of Finite Elements for Determination of the Damping Coefficient of an Eddy Current Damper Using Matlab

2008 ◽  
Vol 36 (2) ◽  
pp. 120-139
Author(s):  
A. S. Das ◽  
A. Nandi ◽  
S. Neogy
Keyword(s):  
Finite Elements ◽  
Eddy Current ◽  
Damping Coefficient ◽  
Eddy Current Damper

scholarly journals Design and Development of Novel Semi Active Eddy Current Damper for Aerospace Applications

2019 ◽  
Vol 8 (10) ◽  
pp. 1589-1592
Keyword(s):  
Eddy Current ◽  
Plate Thickness ◽  
Damping Coefficient ◽  
Structural Vibration ◽  
Aerospace Applications ◽  
Damping Characteristics ◽  
Straight Line ◽  
Eddy Current Damping ◽  
Eddy Current Damper ◽  
Mechanical Devices

The structural vibration damping is of utmost priority and critical for electronic and mechanical devices used in aircraft and automobiles. A novel eddy current damper is designed and developed, thereby the damping characteristics were evaluated theoretically and experimentally to obtain an optimum value of damping coefficient to suppress the vibrations in the devices. After performing the various calculations, the desired value for “c” (eddy current damping co-efficient) is found out to be 150.93 Ns/m for a plate thickness of 3 mm, a current value of 3A, number of turns on the electromagnet was 1000. The graph of “c” vs “t” was found out to be a straight line. The nature of the graph obtained between amplitude of vibration vs time was similar to that of logarithmic decrement curve where the ratio of successive amplitudes remains constant. The value of damping coefficient ζ was found out to be in the desired range of the theoretical value

Electromagnetic methods in nondestructive testing of materials

2003 ◽  
Vol 16 (1) ◽  
pp. 1-23
Author(s):  
Konstanty Gawrylczyk
Keyword(s):  
Sensitivity Analysis ◽  
Finite Elements ◽  
Nondestructive Testing ◽  
Eddy Current ◽  
Quality Evaluation ◽  
Leakage Flux ◽  
Electromagnetic Methods ◽  
Conducting Materials ◽  
Inductive Methods ◽  
Flux Probe

The article deals with progress in electromagnetic methods used for quality evaluation of conducting materials. The term "electromagnetic methods" covers the following areas: magneto-inductive methods, magnetic leakage flux probe method, magnetometer principle and eddy-current methods. For the aim of numerical cracks recognition the sensitivity analysis with finite elements was shown.

Locating complex eigenvalues for analytical eddy-current models used to detect flaws

2019 ◽  
Vol 38 (6) ◽  
pp. 1800-1809
Author(s):  
Grzegorz Tytko ◽  
Łukasz Dawidowski
Keyword(s):  
Eddy Current ◽  
Design Methodology ◽  
Complex Function ◽  
Precise Determination ◽  
Argument Principle ◽  
Content Type ◽  
Conductive Material ◽  
Complex Roots ◽  
Complex Eigenvalues

Purpose Discrete eigenvalues occur in eddy current problems in which the solution domain was truncated on its edge. In case of conductive material with a hole, the eigenvalues are complex numbers. Their computation consists of finding complex roots of a complex function that satisfies the electromagnetic interface conditions. The purpose of this paper is to present a method of computing complex eigenvalues that are roots of such a function. Design/methodology/approach The proposed approach involves precise determination of regions in which the roots are found and applying sets of initial points, as well as the Cauchy argument principle to calculate them. Findings The elaborated algorithm was implemented in Matlab and the obtained results were verified using Newton’s method and the fsolve procedure. Both in the case of magnetic and nonmagnetic materials, such a solution was the only one that did not skip any of the eigenvalues, obtaining the results in the shortest time. Originality/value The paper presents a new effective method of locating complex eigenvalues for analytical solutions of eddy current problems containing a conductive material with a hole.

Laminated steel eddy-current loss versus frequency computed using finite elements

2000 ◽  
Vol 36 (4) ◽  
pp. 1132-1137 ◽  
Author(s):  
J.R. Brauer ◽  
Z.J. Cendes ◽  
B.C. Beihoff ◽  
K.P. Phillips
Keyword(s):  
Finite Elements ◽  
Eddy Current ◽  
Eddy Current Loss ◽  
Current Loss

scholarly journals Determination of the process damping coefficient using plain cutting tests

Procedia CIRP ◽  
2021 ◽  
Vol 101 ◽  
pp. 302-305
Author(s):  
Berend Denkena ◽  
Alexander Krödel ◽  
Lars Ellersiek
Keyword(s):  
Damping Coefficient ◽  
Process Damping

Determination of residual stresses in disk keyways by the finite-elements method

1982 ◽  
Vol 14 (7) ◽  
pp. 865-867
Author(s):  
B. A. Kravchenko ◽  
V. G. Fokin ◽  
G. N. Gutman
Keyword(s):  
Finite Elements ◽  
Residual Stresses ◽  
Finite Elements Method
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