Estimation of Structural Displacements for Flat Shell Structures Using Mode Shapes and Accelerometers

초록

In this study, a method to estimate static and dynamic displacements of wing-like flat structures using measured acceleration data is proposed for structural health monitoring of aircraft wing structures. In the proposed method, the structural deformation is estimated by superposition of selected mode shapes of the structure. Acceleration time integration method which is generally used to estimate displacements from acceleration data requires accurate information on initial conditions, and errors caused by noise can be accumulated during time integration. To avoid these problems, the method based on time integration is supplemented by a mode superposition method based on free vibration assumption. To verify this method, finite element analyses and vibration experiments for wing-like flat structures are conducted. The estimated static and dynamic displacements are compared with the analyzed displacements and the measured displacements using laser displacement sensor. The results show that the estimated displacements are in good agreement with the analyzed and measured ones. From the investigation, it is verified that the proposed approach is valid and useful for estimation of displacements from acceleration data of wing-like flat structures and it is expected to be applied to structural health monitoring of aircraft wings.