Electromagnetic and mechanical coupled deformation and evaluation parameter of magnetic damping for fusion reactor first wall

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Analyzes and experiments on electromagnetic and structural coupled vibration phenomenon or magnetic damping effect are described. The purpose of this study are : (1) To investigate the relation between the magnetic damping effect and the intensity and direction of magnetic field for the mechanical vibration in electromagnetic field ; (2) To determine the parameter of magnetic damping effect by analyzing the change of eigenvalue of the coupled system using finite element method ; (3) To investigate the dependence of the parameter on stiffness, thickness, density and the magnetic field intensity ; (4) To establish the evaluation method of the magnetic damping effect of the fusion reactor first wall.The results obtained in this study are as follows.1.Electromagnetic and mechanical coupled experimentVibration tests of thin conducting plates were performed in steady magnetic field. The change of natural frequency and the damping rate caused by the coupled effect was measured by use of laser … More deflection sensor and dynamic strain amplifier. The relations between the intensity of magnetic damping and parameters such as Young's modulus, thickness and magnetic field intensity can not be described by an exponential function because of the influence of inductance effect.2.Consideration on coupling parameterFinite element analysis and theoretical consideration were performed for the change of eigenvalue, the damping rate, and the change of natural frequency in the magnetic field. The dependence of parameters were clarified.3.Coupling intensity parameter for the magnetic damping effectThe coupling intensity parameter is proposed as a parameter of magnetic damping effect based on the experimental and numerical results. It is confirmed that the magnetic damping effect is described uniquely using this parameter.Further investigation is needed for the experiment and analysis of complicated configurations similar to real first wall structures and for preparation for first waall structural design criteria considering the magnetic damping effect. Less