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Design and structural analysis of support structure for ITER vacuum vessel

板バネを用いたITERトカマク機器用支持構造の振動に関する基礎特性試験

武田 信和; 大森 順次*; 中平 昌隆; 柴沼 清

Takeda, Nobukazu; Omori, Junji*; Nakahira, Masataka; Shibanuma, Kiyoshi

トロイダル磁場コイルや真空容器等のITERの主要機器に用いられる板バネを用いた支持構造体に関して、剛性の荷重方向依存性等の基礎的機械特性の取得を目的として、小規模試験体を用いた振動試験を行った。打診試験と周波数スイープ試験とによって得られた実験結果は一致しており、実験方法の信頼性が確認された。また、適切な数値計算手法を評価するため、実験結果を数値計算結果比較した。その結果、ボルト締結が支持構造の剛性に強い影響を与えることが明らかになった。ボルトのモデル化に関する考察の結果、ボルトの引張方向の剛性のみを有限とし、他の方向の剛性を有限とするモデルを用いた数値計算結果が実験結果と一致した。このモデルを用いて、ITERの主要機器の動的挙動を評価するために必要な、支持構造の剛性が正確に計算できる。

The vibration experiments of the support structures with flexible plates for the ITER major components such as toroidal field coil and vacuum vessel were performed using small-sized flexible plates aiming to obtain its basic mechanical characteristics such as dependence of the stiffness on the loading angle. The experimental results obtained by the hammering and frequency sweep tests were agreed each other, so that the experimental method is found to be reliable. In addition, the experimental results were compared with the analytical ones in order to estimate an adequate analytical model. As a result, the bolt connection strongly affected on the stiffness of the support structure. After studies of modeling the bolts, it is found that the analytical results modeling the bolts with finite stiffness only in the axial direction and infinite stiffness in the other directions agree well with the experimental ones. Using this model, the stiffness of the support structure for the ITER major components can be calculated precisely in order to estimate the dynamic behaviors.

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