声发射是材料产生变形或断裂，以弹性波形式释放应变能的现象。目前基于声发射监测的拉索损伤识别研究，监测位置通常靠近损伤源，没有考虑波形从损伤源传播到监测点这一过程变化，而实桥拉索长度不等，不同的损伤波传播距离将产生完全不同的识别结果。本项目通过研究声发射应力波在索内的传播规律，建立基于特征量反演的远距离损伤源识别模型。通过进行摩擦、腐蚀及断丝等不同损伤源声发射试验，提取可量化的不同损伤源波形特征；以量化的波形特征为研究对象，进行单根钢丝及拉索波传播试验；根据不同损伤源应力波在钢丝及拉索内传播的全波形变化规律，由多个波形特征量回归分析得到索内应力波传播数学模型，最终建立源识别特征量反演模型。研究成果将为拉索声发射监测系统的合理设计提供理论依据和方法，同时对拉索以外的其它索支承体系的损伤监测问题也具有参考价值。

Acoustic emission (AE) is a phenomenon of elastic wave releasing when a material undergoes deformation or crack. At present, the research on AE monitoring of bridge cables usually considers the position near to the damage, and not take into account the effect that wave propagate from damage position to monitoring instrument. However, the length of bridge cable is different, which will lead to different identification result because of the wave propagation. Through the study on the propagation characteristics of stress waves in cables, this research aims to build a damage identification model for long distance monitoring of cables based on the inversion of characteristic quantities. The characteristic quantities can be obtained through AE experiments using different kind of sound sources, such as friction, corrosion and wire breakage. First, the research is focused on the characteristics of wave form by doing wave propagation experiments in long wires and cables. Then, considering the wave features from different damage sources in wires and cables, a mathematical model of wave propagation will be built through the regression analysis of waveform characteristic quantities. Finally, the source identification model will be established based on the inversion of characteristic quantities by combining waveform characteristics of different kind of source damages. The results of this research will not only provide theoretical foundation and method for designing AE monitoring system for cables, but also have reference value for the monitoring of other cable-supported structures.