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The purpose of this research is to obtain an estimation of behavior of an elastic body based on errorneous observations. To do this, the ensemble Kalman filter finite element method is used. In numerical study, a three dimensional elastic body is considered. 2 case studies are carried out. In case 1, cantilever beam is used for the verification. Dynamic motion is caused by the external force applied to the body. As the boundary condition, one side of the beam is fixed in all directions. Observation data of acceleration at observation points are necessity to estimate acceleration at some other points. In this study, artificial data is used. Computed values plus the white Gaussian noise is used as artificial observations. The finite element method is applied to the spatial discretization and the linear acceleration method(Newmark method) is used as the temporal interpolation. Finally, the estimation is compared with the results by the finite element method, and effectiveness of the EnKF is verified.We suggest that an ensemble of size 5, 10 and 40 to consider the relation between the size of ensemble members and accuracy of the EnKF. In case 2, an actual site is used for the verification. The Iwatayama tunnel is employed. This construction site is located in Gifu prefecture, in Japan. The external force is applied to the tunnel face. As the boundary condition, bottom of the computational model is fixed in all directions. The EnKF is applied to Iwatayama tunnel as well as cantilever beam.

Ensemble Kalman Filter Finite Element Method Applied to Dynamic Motion of Elastic Body