Investigation of the dynamic behavior of the ITER tokamak assembly using a 1/5.8-scale model

The dynamic behavior of the ITER tokamak assembly has been investigated, using a 1/5.8-scale model. In the static load test, the observed deformations and stresses were confirmed to be linearly proportional to the applied loads. In the vibration test, the first and third eigen-modes corresponded to...

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Bibliographic Details
Published inFusion engineering and design Vol. 81; no. 1; pp. 155 - 161
Main Authors Onozuka, M., Shimizu, K., Nakamura, T., Takeda, N., Nakahira, M., Tado, S., Shibanuma, K.
Format Journal Article Conference Proceeding
LanguageEnglish
Published Amsterdam Elsevier B.V 01.02.2006
New York, NY Elsevier Science
Subjects
Applied sciences
Controled nuclear fusion plants
Dynamic behavior
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Installations for energy generation and conversion: thermal and electrical energy
ITER
Seismic
Support
Tokamak assembly
Vibration
Dynamic behavior
Tokamak assembly
ITER
Vibration
Support
Seismic
Tokamak
Nuclear fusion reactor
Stress analysis
Scale model
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Summary:The dynamic behavior of the ITER tokamak assembly has been investigated, using a 1/5.8-scale model. In the static load test, the observed deformations and stresses were confirmed to be linearly proportional to the applied loads. In the vibration test, the first and third eigen-modes corresponded to horizontal vibration modes, with natural frequencies of about 29 and 81 Hz, respectively. The global-twisting and oval modes were found to be in the second and forth modes, with frequencies of about 60 and 86 Hz, respectively. A comparison of experimental and analytical results showed that the deflections and the induced stresses in the analysis were approximately half of those found in the experiment. Natural frequencies have also been compared. The frequency in the first mode was almost the same for both the experiment and the analysis. However, in higher vibration modes, the natural frequencies in the experiment were found to be smaller than those in the analysis. To further examine the dynamic behavior of the coil structure, a vibration test of the entire sub-scale model is planned using the vibration stage rather than the shaker.
ISSN:0920-3796
1873-7196
DOI:10.1016/j.fusengdes.2005.09.070