Optical Fiber-Based Strain Field Measurement and Reconstruction for High-Speed EMU Beam
This paper addresses the issue of strain field reconstruction for the underframe beam of high-speed EMUs by proposing a method that reconstructs the structural spatial strain field according from the measured unidirectional strain at specific measuring points,utilizing the modal superposition method and sensor optimal configuration theory.With the strain mode of the structure as the input and the independence of modal coordi-nates as the optimization goal,a mathematical model for optimal sensor configuration is established based on in-formation entropy theory,and then the structural strain field is reconstructed using a regularization method in ac-cordance with modal coordinates and vibration modes.Noise-free simulation results indicate high reconstruction accuracy,with the maximum mean square error being 9.87×10-12.The regularization method can effectively suppress the impact of noise on the results.A test bench based on Fiber Bragg grating sensing system has been constructed,and the strain field is reconstructed based on the measured strain data and modal results.The re-sults show that the relative error band for the reconstructed strain amplitude is 1.21%～10.79%,and the mean square error band for the reconstructed and the measured data is 0.80～3.69.The method proposed in this paper can accurately identify the modal coordinates of the structure,offering a novel approach for acquiring the strain field distribution of critical structure in high-speed train.
strain field reconstructionoptimal sensor placementstrain modefiber Bragg grating
NETL
NSTL
万方数据
维普
