基于半解析模型的涡流传感器优化设计与实验研究

针对飞机金属螺栓孔连接结构疲劳裂纹的特点与实时监测的需求，提出了一种基于柔性平面的涡流阵列传感器，设计了疲劳裂纹扩展实时监测方案，构建了传感器损伤监测半解析模型，搭建了基于涡流阵列传感器的疲劳裂纹扩展实时监测平台。通过对涡流阵列传感器的仿真和基于涡流阵列传感器的疲劳裂纹扩展实验研究，确定了传感器的监测灵敏度，优化了传感器的特征参数。研究结果表明：传感器基材层阻碍了感应线圈与激励线圈的耦合，基材层应尽量薄。当涡流阵列传感器导电层厚度为0．12—0．18mm，激励线圈的最优宽度为0．8min，感应线圈的最佳厚度为0．5mm时，传感器的损伤监测灵敏度最高。

Optimization design and current sensor based experimental research of eddy on semi-analytical model

Aiming at requirement of characteristics and real-time monitoring of fatigue crack located at the hole of metaliic bolted-joint structure, a kind of eddy current array sensor based on flexible plane is proposed. A re＇d-time scheme for fatigue crack propagation monitoring is designed. Semi-analytical model for sensor damage monitoring is constructed, and platform of real-time monitoring on fatigue crack extension based on eddy array sensor is bulit. The characteristic parameters of eddy current sensor array are optimized and the monitoring sensitivity of the sensor is determined through simulation on eddy array sensor and experimental research on fatigue crack extension. Research resuhs indicate that the substrate layer impedes the electromagnetic coupling between exciting windings and sensing windings. The thickness of substrate layer should be as thin as possible. While the thickness scope of conductive layer of eddy array sensor is 0.12-0.18 mm,the optimal width of exciting coil is 0.8 mm and that of sensing coil is 0.5 ram,and the sensitivity of damage monitoring of sensor is the highest.