Dynamic displacement prediction of beam structures using fiber bragg grating sensors

Abstract

Real-time displacement prediction of the deformed structures has important implications in engineering applications. In view of advantages of fiber bragg grating (FBG) sensors in engineering applications and insufficient research in dynamic displacement prediction, this paper proposes a new method to reconstruct dynamic deformation of beam structures by using fiber bragg grating sensors. By using a set of strain values got from FBG sensors, full-field dynamic deformation can be monitored. The new method is based on kalman filter and inverse Finite Element Method (iFEM). First, The strain state equations of beam structures are constructed by using the finite element method (FEM). Then, Kalman filter is used to suppress vibration noise. At the last, iFEM is used to construct dynamic deformation. To verify the effectiveness of the new method, numerical simulations and experiments of beam structures are employed and the results show that the method has a good performance.