Novel FBG rosette for determining impact location in thin plate-like structure

11th International Conference on Damage Assessment of Structures

物理学;材料科学

Majewska, K.^1 ; Opoka, S.^1 ; Kudela, P.^1 ; Ostachowicz, W.^1,2

Institute of Fluid Flow Machinery of PASci, Fiszera 14, Gdansk

80-952, Poland^1

Warsaw University of Technology, Narbutta 84, Warsaw

02-524, Poland^2

关键词: Fibre Bragg grating sensors;    Force excitation;    Homogeneous deformation;    Impact locations;    Modulation depth;    Principal directions;    Thin composite plates;    Wave propagation velocities;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/628/1/012118/pdf
DOI  :  10.1088/1742-6596/628/1/012118

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The paper consists of two interdependent parts. The first part presents numerical simulations of output response of single Fibre Bragg Grating (FBG) sensor which is driven by homogeneous deformation along sensor length. The example of such sensor is FBG sensor glued at only two points. The grating length and modulation depth of the refractive index are the critical parameters contributing to performance of the FBG sensors. Numerical analysis allowed to select an appropriate FBG sensors which will be used in the impact detection problem. In the second part of the paper a novel strain rosette with specific sensor array used in impact localisation problem is discussed and presented. The experiment was carried out on thin composite plate with the use of pulse force excitation. The method is based on estimation of principal direction of perturbed travelling wave initiated at impact point and does not use any information about wave propagation velocity.