Abstract
The coupling effect between the electromagnetic field and mechanical response of a conducting structure is of importance in magnetic fusion devices such as a tokarnak machine. The electromagnetically induced motion of the structure due to the Lorentz force induces additional eddy currents and further modifies the dynamic characteristics of the system. This paper is concerned with the numerical modeling of the dynamic field-structure interaction and its verification by experimental tests.
Here, a finite element numerical model for mechanical deformation and a wire-grid numerical model for eddy currents are employed for non-ferrous and elastic conductors. A computer code has been developed for 3D thin shell structure. Experimental tests for the code verification were carried out by using rectangular thin copper plates. Three kinds of the plate supporting systems were investigated: a cantilever system, a system with both ends fixed, and a system with simply supported ends. A good agreement between the numerical and experimental results was obtained. Therefore, the computer code developed here is available for analyzing the electromagnetomechanical behavior of the plasma facing components of the tokamak device and for realizing the optimum structure configuration where the electromagnetic load is minimized.
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