为改善复合材料结构大范围检测需求，进一步提高检测灵敏度和成像精度，本项目针对结构健康监测(SHM)系统中的PVDF叉指式换能器(IDT)存在弱驱动力及复杂损伤特征等问题，在研究正交异性压电纤维复合材料(OPFC)IDT构造理论及相关技术的基础上，提出了一种全方位可调宽频带柔性DE-IDT及阵列驱动/传感器件，通过数值仿真、理论计算和实验验证等方法，研究其在力电耦合作用下与被测构件的耦合机制、结构参数优化设计理论、3D打印加工工艺及其性能标定方案，所形成的DE-IDT阵列具有全方位激发与接收、宽频带、高弹性、高电能密度和高机电耦合效率等特性；构建自适应波束成形及宽频带导波信号的模态分离及损伤特征信号提取算法和SHM实验平台，研究复合材料中新型频率-波数(f-k)域多模态波束成形损伤融合成像方法，所形成的全面评价复合材料损伤成像的相关理论及技术体系具有重要的学术意义和工程应用价值。

In order to improve the large-scale detection requirements of composite materials and further improve the detection sensitivity and imaging accuracy, such problems as the weak actuating force of PVDF- interdigital transducer (IDT) and complex damage characteristics in the composite structure health monitoring (SHM) system were proposed. Based on the research of high-performance orthotropic piezoelectric fiber composite (OPFC) IDT construction theory and related technologies, a flexible dielectric elastomer (DE) substrate and compliant electrode with adaptive function was proposed innovatively. The omni-directionally adjustable broadband flexible DE-IDT and its relative actuator /sensor array, through numerical simulations, theoretical calculations and experimental verification, have studied their coupling mechanisms and structural parameters with the composite materials under force-electric coupling. Optimized design theory, 3D printing precision preparation process and its performance calibration program were also studied. The resulting DE-IDT array has features such as full excitation and reception, wide frequency band, high elasticity, high power density, high electromechanical coupling efficiency, and is easy to arrange and plant. The separation of wide-band guided wave signals, damage signature signal extraction algorithms and SHM experimental platform were constructed. A new frequency-wavenumber (f-k) domain multi-modal beam-forming damage fusion imaging method in composite materials was developed. The relevant theories and technical systems of damage imaging resulting in comprehensive evaluation of composite materials have important academic significance and engineering application value.