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复合材料由于具有介质的不均匀性、各向异性的特点,常规声发射定位方法检测难以实现对其进行声发射源定位,作者提出利用单个声发射传感器(acoustic emission,AE),基于时间反转法(time reversal,TR)实现复合材料声发射源定位。在测试过程中,基于散射场条件和声场的互易性,时反和互易性时反(inverse filtering,IF)方法均较准确实现复合材料板材(100cm×100cm×3mm)表面的声发射源定位。相对常规多传感器声发射源定位,时反方法定位精度可提高34.8%,并且不需要各向异性介质的相关先验知识(声速等)。互易性时间反转定位法在TR的基础上可进一步提高AE源信号的聚集效果,其第二匹配系数可提高36.4%。
Due to the heterogeneity and anisotropy of the medium, the composite material is difficult to locate by conventional acoustic emission localization method. The authors propose to use single acoustic emission (AE), time-based inversion Method of time reversal (TR) for the location of composite acoustic emission sources. In the testing process, based on the conditions of the scattering field and the reciprocity of the sound field, the inverse and reciprocal inverse filtering (IF) methods can accurately achieve the acoustic emission sources on the surface of the composite material sheet (100 cm × 100 cm × 3 mm) Positioning. Compared with the conventional multi-sensor acoustic emission source positioning, anti-method positioning accuracy can be increased by 34.8%, and does not require the relevant prior knowledge of anisotropic media (sound velocity, etc.). Reciprocal time-reversal localization method can further improve the AE source signal gathering effect on the basis of TR, and the second matching coefficient can be increased by 36.4%.