Abstract Microseismic source/acoustic emission (MS/AE) localization method is crucial for predicting and controlling of potentially dangerous sources of complex structures. However, the locating errors induced by both the irregular structure and pre-measured velocity are poorly understood in existing methods. To meet the high-accuracy locating requirements in complex three-dimensional hole-containing structures, a velocity-free MS/AE source location method is developed in this paper. It avoids manual repetitive training by using equidistant grid points to search the path, which introduces A* search algorithm and uses grid points to accommodate complex structures with irregular holes. It also takes advantage of the velocity-free source location method. To verify the validity of the proposed method, lead-breaking tests were performed on a cubic concrete test specimen with a size of 10 cm × 10 cm × 10 cm. It was cut out into a cylindrical empty space with a size of ϕ6 cm × 10 cm. Based on the arrivals, the classical Geiger method and the proposed method are used to locate lead-breaking sources. Results show that the locating error of the proposed method is 1.20 cm, which is less than 2.02 cm of the Geiger method. Hence, the proposed method can effectively locate sources in the complex three-dimensional structure with holes and achieve higher precision requirements.

中文翻译：

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三维含孔结构的无速度 MS/AE 源定位方法

摘要 微震源/声发射（MS/AE）定位方法对于复杂结构潜在危险源的预测和控制至关重要。然而，现有方法对不规则结构和预测速度引起的定位误差知之甚少。为了满足复杂三维含孔结构的高精度定位要求，本文开发了一种无速度MS/AE源定位方法。它通过使用等距网格点搜索路径避免了人工重复训练，引入了A*搜索算法，使用网格点来适应具有不规则孔洞的复杂结构。它还利用了无速度源定位方法。为了验证所提出方法的有效性，对尺寸为 10 cm × 10 cm × 10 cm 的立方混凝土试样进行了断铅试验。它被切割成一个直径为 φ6 cm × 10 cm 的圆柱形空白空间。基于到达，经典的盖革方法和所提出的方法被用于定位破铅源。结果表明，该方法的定位误差为1.20 cm，小于Geiger方法的2.02 cm。因此，所提出的方法可以有效地在具有孔的复杂三维结构中定位源，并达到更高的精度要求。结果表明，该方法的定位误差为1.20 cm，小于Geiger方法的2.02 cm。因此，所提出的方法可以有效地在具有孔的复杂三维结构中定位源，并达到更高的精度要求。结果表明，该方法的定位误差为1.20 cm，小于Geiger方法的2.02 cm。因此，所提出的方法可以有效地在具有孔的复杂三维结构中定位源，并达到更高的精度要求。