Acoustic emission localization method based on improved whale optimization algorithm
In order to improve the accuracy of AE source location,an improved whale optimization algorithm was proposed,and a method of AE event locating method was generated based on this algorithm.According to the time difference between different channels,an objective function based on the least square method was established.The objective function was solved by the search mechanism of improved whale optimization algorithm,then the AE events location results were obtained.In order to accurately evaluate the positioning accuracy of the improved whale optimization algorithm,the coal rock pencil-lead breaking experiment and mode Ⅰ fracture experiment under three-point bending condition were carried out for verification.The positioning results of the improved whale optimization algorithm,whale optimization algorithm,Geiger algorithm,and least square method were compared and analyzed.The results show that the improved whale optimization algorithm has higher positioning accuracy than other algorithms,and the cumulative effective AE events are more concentrated in the real fracture process area;the results of AE event location at each stage of the improved whale optimization algorithm are consistent with the results obtained by digital image correlation method.It can effectively reflect the dynamic evolution process of crack initiation and propagation in coal rock specimen.
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