Transactions of Nanjing University of Aeronautics & Astronautics
Construction of Crack Perturbation Model and Forward Semianalytical Model of Attached Eddy Current Sensor
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Abstract:
Fatigue damage monitoring is critical metallic structure health monitoring of aircraft. The sensor should be high sensitive, easy to be integrated into structure and well adaptable for poor working conditions. Therefore, an attached eddy current sensor with flexible plane is put forward and its characteristics are analyzed. By extracting material′s conductivity as the crack features, forward semianalytical model is established and parameter optimizations are carried out. Crack perturbation model of attached eddy current sensor is constructed, and perturbation voltages of sensing channels under threedimension structural crack are obtained. To verify the sensor′s performance, monitoring experiment on crack extension is conducted under condition of 3 MHz frequency. The validation experimental results show that perturbation model of 2A12T4 aluminum alloy agrees well with experiment results, and perturbation model errors of four sensing channels are within 25%. The attached eddy current sensor is capable of testing the crack nondestructively and measuring the crack extension zuantitatively with the accuracy of 1 mm.
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Project Supported:
the National Natural Science Foundation of China (No.51175509).
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