Design Of GMM-FBG AC Current Sensor Based On Smith Free Energy Hysteresis Model

Optical fiber material has good insulation,strong anti-electromagnetic interference ability,and has the function of sensing communication.Giant magnetostrictive materials have high heat-resistant temperature and strong magnetostrictive ability,which are often used in precision machining and sensing measurement.Based on the advantages of the two kinds of smart materials,an optical current sensor combining Giant Magneto-Strictive Material(GMM)and Fiber Bragg Grating(FBG)was designed,and a GMM-FBG AC current sensor was designed.The experimental platform of GMM-FBG AC current sensor is built,and the simulation experiment and data analysis of the corresponding sensor model are completed.On the basis of the existing literature,the sensing characteristics of GMM and FBG materials are analyzed,and the current sensor model of GMM-FBG is constructed.Based on the Smith free energy hysteresis model,the dynamic free energy hysteresis model is established.The dynamic free energy hysteresis model,which is composed of the free energy hysteresis model coupled with the equivalent ordinary differential equation of the eddy current loss,uses the equivalent resistance method to calculate the eddy current loss in the strain process of GMR materials.The parameters of the improved dynamic model were identified and optimized by using the nonlinear genetic algorithm,and the dynamic free energy hysteresis model with the optimal parameter combination was obtained,which improved the prediction accuracy of the model for hysteresis curve under power frequency.Based on the GMM-FBG current sensor model,the GMM-FBG current sensor experimental platform was built,and the experimental simulation and data analysis were carried out.The hysteresis characteristics of the sensor are simulated and compensated by using the dynamic free energy model with optimized parameters.The validity of the sensor model and the correctness of the parameter identification results are proved by analyzing the experimental data.Based on the GMM-FBG current sensor model,the GMM-FBG current sensor experimental platform was built,and the experimental simulation and data analysis were carried out.The hysteresis characteristics of the sensor are simulated and compensated by using the dynamic free energy model with optimized parameters.The validity of the sensor model and the correctness of the parameter identification results are proved by analyzing the experimental data.