提出一种基于Livelink数据交互的光纤布拉格光栅-力学结构感知仿真方法。通过Livelink模块将光纤布拉格光栅(FBG)传感仿真模型与COMSOL有限元多物理场耦合模型结合,建立了COMSOL与MATLAB的交互式模型,实现了应力和温度等多物理场下FBG对力学结构感知信号的仿真分析。采用基于自适应滑动窗口的效率优化模块,提高了FBG反射光谱的仿真速度。同时,基于典型工字梁结构与光纤布拉格光栅传感器,实现了光纤布拉格光栅-力学结构多物理场感知仿真分析模型的验证。实验结果表明:工字梁静载实验中,仿真与实测的FBG中心波长偏移量误差小于4.6%,其均方根误差小于0.0048;冲击载荷实验中,仿真结果与实测数据具有较好的吻合度,进一步验证了本文提出仿真方法的正确性,可为FBG传感网络的排布提供仿真依据。

In this paper, a sensing simulation method for fiber Bragg grating (FBG)-based mechanical structures, based on Livelink data interaction, is proposed. The proposed simulation method combines the FBG sensing simulation model with the COMSOL finite element multiphysical field coupling model using the Livelink module. An interactive model based on the combination of COMSOL and MATLAB was established to realize the simulation analysis of the FBG sensing signal from mechanical structures under multiple physical fields such as stress and temperature. Moreover, an efficiency optimization module based on an adaptive sliding window was adopted to improve the speed of simulation of the FBG reflectivity spectrum. Finally, a typical H-beam structure and FBG sensors were used to verify the FBG-based mechanical structure sensing simulation model. Results show that the error of the FBG center wavelength offset between simulation and experiment is less than 4.6%, and the root-mean-square error is less than 0.0048. In an impact-loading experiment, simulation results were in good agreement with the measured data, which further verifies the correctness of the simulation method proposed in this paper. Furthermore, this simulation method can lay the foundation for the arrangement of FBG sensor networks.