1999 Fiscal Year Final Research Report Summary
Study of magnetic resonance damping effect for fusion reactor components
| Project/Area Number |
10680475
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Nuclear fusion studies
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| Research Institution | Kyushu Institute of Technology |
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Principal Investigator |
NIHO Tomoya Faculty of Computer Science and Systems Engineering, Department of Mechanical System Engineering, Kyushu Institute of Technology, Research Associate, 情報工学部, 助手 (60295011)
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| Co-Investigator(Kenkyū-buntansha) |
NAKAGAKI Michihiko Faculty of Computer Science and Systems Engineering, Department of Mechanical System Engineering, Kyushu Institute of Technology, professor, 情報工学部, 教授 (90207720)
HORIE Tomoyoshi Faculty of Computer Science and Systems Engineering, Department of Mechanical System Engineering, Kyushu Institute of Technology, Associate Professor, 情報工学部, 助教授 (40229224)
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| Project Period (FY) |
1998 – 1999
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| Keywords | Electromagnetic-Structural Coupling / Electromagnetic-Induced Vibration / Coupled vibration / Characteristics of Magnetic Damping / Coupled Eignevalue / Coupled Finite Element Analysis / Fusion Reactor |
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| Research Abstract |
In future fusion reactors, magnetically damped vibration is developed by the interaction between the mechanical deformation and the eddy current for the conductive structures located in an electromagnetic field. Therefore, clarifying the characteristic of the magnetically damped vibration is required to the mechanical design of these components.
The results that were obtained by this research are as follows:
l. Characteristic of magnetically damped vibration
Since the equation of motion for magnetically damped vibration is expressed as the third order differential equation that is obtained from the one-degree-of-freedom magnetically damped vibration model, the characteristic of this vibration is different from that of general damped vibration. Also, the resonance frequency that is important for the mechanical design to avoid the resonance vibration changes with the magnetic damping effect.
2. Dependence of resonance frequency for magnetically damped vibration
In order to clarify the characteristic of the magnetically damped vibration, experiments and numerical analyses were performed. In the experiments, the resonance frequencies of the plate for the magnetically damped vibration were measured during the vibration test under various conditions with the magnetic field form 0.0T to 0.3T and the length of the plate from 70mm to 110mm. In the numerical analyses, the coupled eigenvalues were obtained from the coupled finite element equation under the same conditions as those of the experiments. The dependence of the resonance frequency on the magnetic field and the length of the plate were obtained.
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