Acoustic Emission Source Location Method For Geiger Optimization Iterative Algorithm Based On The All-phase Phase Difference

Acoustic emission localization is used in rock fracture,which is of great significance to the early warning of the rock and mineral.The commonly used acoustic emission localization methods are the time difference positioning,the cross correlation localization,the Geiger localization.Geiger algorithm is widely used in the field of earthquake,which is particularly harsh for the iterative requirements of the initial value,if the initial iteration is not rigorous at the beginning of the selection,then the iteration is not easy to enter the range of convergence,which will increase the number of the iteration.In order to solve the above problems,a method of Geiger acoustic emission source location based on all-phase phase difference method is proposed.The specific experiment:The lead breaking experiment is performed on the 50 mm x100 mm x 50 mm granite,then making full use of all-phase FFT to analyze the broken lead signal,and the time delay is calculated by the phase difference method,at the same time,the initial value of Geiger iteration is obtained by the inversion of acoustic emission source,and the optimal solution is obtained by the least square method and Geiger algorithm,which determines the coordinates of the rock failure point.The simulation results show that this method can effectively solve the problem of selecting the initial value of Geiger,so that it can enter the scope of convergence faster.And compared with the average error of positioning results of the PCI-2 type acoustic emission instrument,the error is reduced by about 6mm.At the same time,under the same experimental conditions,the other three acoustic emission localization algorithms(Rock acoustic emission localization method based on all-phase multiple correlation;Rock acoustic emission localization method based on multiple correlation and Geiger algorithm;Rock acoustic emission localization method based on all-phase multiple correlation and Geiger algorithm)have been done respectively.The results show that the Geiger algorithm based on all-phase phase difference method is the best one.