| 講演要旨(和文) | | 微動中のレーリー波の位相速度を求めるための新しい推定法を導いた.この方法はセンサーを任意に配置できるという利点をもつ.本研究で提案した方法は,複数の複素コヒーレンス関数(Complex Coherence Function: CCF)によって任意アレーの信号出力を数学的に表現し,これらの式から観測値と理論値との残差を最小とする波数を求めて位相速度の推定を行う.ここでは,まずCCFを用いた任意アレーの数学的表現方法およびその解法を示し,次にCCFの近似方法および拘束条件の設定方法について数値実験による検討を行った. |
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| | 講演要旨(英文) | | We have derived a new estimation technique for the Rayleigh wave phase velocity in microtrmors. This technique allows us to employ the unconfined sensor configurations during the observations. The phase velocities can be obtained from solving the equations that are composed by complex coherence functions - CCFs. The expression manner of a sensor array using CCFs is explained here and the solution procedure is also presented. In addition, some characteristics of this technique, approximation process of the CCF and rough standard for the installation of restraint condition, are discussed by a numerical experiment. |
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