结构健康监测是保障工程结构安全、降低维护成本的前沿热点研究。导波阵列监测是极具应用前景的损伤诊断方法，但在面向复合材料工程结构时，还存在多源损伤信号耦合、损伤信号微弱、基准信号混叠等导致损伤监测可靠性大幅下降的瓶颈问题。本项目拟利用均匀圆形压电阵列的构型特征及其在UCA-mode域内阵列导波信号数学特性具备可解决上述问题的潜力，先构建多源损伤散射的近场阵列导波UCA-mode域信号矢量模型；建立UCA-mode域平滑算法的可执行条件实现多源损伤信号解相干，进而提出复合材料结构多源损伤的阵列导波UCA-mode域监测方法；提出差分-秩损算法并基于此建立基准信号的在线滤除机制，将其与UCA-mode域方法融合实现损伤监测免基准优化；最后，研制基于UCA-mode域的多源损伤监测系统，并于在役的复合材料结构上进行工程适用性验证。本项目研究对促进复合材料结构健康监测技术的工程应用具有重要意义。

Structural health monitoring (SHM) is a hot topic, which can guarantee the safety of engineering structure and reduce the maintenance cost. It has been proved that guided wave array based method is promising in application for damage diagnosis. However, there are several bottleneck problems such as multi-damage scattered signals coupling, damage scattered signal weak and baseline signal aliasing, which can reduce the reliability of damage monitoring of this method greatly in composite engineering structures. Hence, this project exploits the configuration characteristics of uniform circular piezoelectric array and the mathematical properties of array guided wave signals in UCA-mode domain, which has the potential to cope with the above mentioned problems. The model of near-field array guided wave signals caused by multi-damages scattering is constructed in UCA-mode domain first. Then, the condition for executing the smoothing method in UCA-mode domain is built to achieve the de-coherence of the multi-damage scattered signals, and then the dense guided wave array based method in UCA-mode domain for monitoring multi-damages of composite materials is proposed. To filter the baseline signal on line, the difference-rank-reduce method is proposed, and then the method in UCA-mode domain and the difference-rank-reduce method are combined to realize the optimization with baseline signal free. At last, a functional demonstration system is built on the composite structure in service to verify the engineering applicability of the proposed method. This project can promote the engineering application of SHM for composite structures.