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原子力施設の振動特性精密評価のためのアクロスによる周波数コムスペクトル計測法,3; 存否法による3次元構造物の多元的振動特性評価

Frequency comb spectroscopy for reliable evaluation of vibration characteristics of nuclear facilities by means of ACROSS, 3; Data processing method to estimate the vibration characteristics in multi-scales by means of SOMPI method

西田 明美  ; 鈴木 喜雄   ; 林 幸子; 國友 孝洋*; 熊澤 峰夫*; 羽佐田 葉子*

Nishida, Akemi; Suzuki, Yoshio; Hayashi, Sachiko; Kunitomo, Takahiro*; Kumazawa, Mineo*; Hasada, Yoko*

アクロスによって得られる伝達関数データの解析手法として従来用いられてきた存否法を、3次元構造物の多数点の測定で得られる伝達関数データ群の解析用に適用した。その2で得られた周波数領域計測データの解析に、時間領域と空間-波数領域の両面から2段階のアプローチを総合して、線形力学系の整合的なモデルとしての結果を得られる手法を開発している。これでは、構造物の大局的な振動特性(固有振動数,減衰,振幅,位相等)と各部材レベルでの局所的波動伝播特性(伝播速度,波長,部材間の相互作用など)、さらに、それらの微小な時間変動の検出までをできるようにした。

The transfer function data in frequency domain acquired by ACROSS is analyzed by SOMPI method, which is based essentially on AR model as a discrete equivalent of linear dynamic system. The analysis is made in two steps, time domain analysis and space-wave number domain both in a consistent way as a linear dynamic system. We have derived an accurate set of vibration characteristics including attenuation and also the local characteristics such as wave propagation within the structural units and their interactions. Detection of small change in the structure is demonstrated by introduction of very precise measurement by ACROSS combined with the data analysis by SOMPI method.

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