摘要
To solve the problem that the existing acoustic emission(AE) source location algorithms cannot always obtain accurate results for multilayer cylindrical media,a new acoustic emission source location method considering refraction was proposed.AE source coordinates were solved by the complex method.Pencil-lead-break experiments were used to verify this method.The absolute distance errors of location results are less than 3 mm,much less than those by the traditional method.The numerical experiments were used to further analyze factors that affect location accuracy.The results of numerical experiments show that the location accuracy of the proposed method is not affected by the ratio of wave velocities but affected by the measurement accuracy of wave velocity.These results show that new method can obtain accurate AE source location in the two-layered cylindrical surface media such as the triaxial compression test.
为了解决现有声发射源定位算法对多层曲面介质定位结果不准确的问题,提出一种新的考虑折射的声发射源定位算法。利用复合形算法求解得到声发射源坐标,采用断铅试验验证新算法的准确性。新算法定位结果的绝对距离误差小于3 mm,比传统算法有较大的提高。运用数值试验进行定位精度影响因素分析。结果表明,新算法的声发射源定位精度不受层状介质波速比的影响,但测量波速的准确性对定位精度有影响。这些均说明新算法能够在两层曲面介质比如常规三轴压缩测试中得到准确的声发射源位置。
基金
Project(2015CB060200)supported by the National Basic Research Program of China
Project(41772313)supported by the National Natural Science Foundation of China
Project(MDPC201803)supported by the Open Fund Research Program of State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology,China
Project(2019zzts308)supported by the Fundamental Research Fund for the Central Universities of Central South University,China