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

对电磁与结构耦合振动现象或磁阻尼效应进行了分析和实验。本研究的目的是：(1)研究磁场中机械振动的磁阻尼效应与磁场强度和磁场方向的关系，(2)通过有限元分析耦合系统本征值的变化来确定磁阻尼效应的参数，(3)研究参数与刚度、厚度、密度和磁场强度的关系；(4)建立了聚变堆第一壁磁阻尼力的评价方法，研究结果如下：1.进行了导电板在恒定磁场作用下的电磁与机械耦合振动试验。利用激光…测量了耦合效应引起的固有频率和阻尼率的变化更多的挠度传感器和动态应变放大器。由于受电感效应的影响，磁阻尼强度与杨氏模数、厚度和磁场强度等参数之间的关系不能用指数函数来描述。2.考虑耦合参数。对磁场中本征值、阻尼率和固有频率的变化进行了有限元分析和理论考虑。3.磁阻尼效应的耦合强度参数在实验和数值结果的基础上，提出了耦合强度参数作为磁阻尼效应的参数。实验结果表明，该参数唯一地描述了结构的磁阻尼效应。对于与真实第一墙结构相似的复杂构型的试验和分析，以及建立考虑磁阻尼效应的第一墙结构设计准则，还需要进一步的研究。较少

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