Full Waveform Inversion Based On Acoustic Emission Study On The Health Condition Of Concrete

Acoustic emission analysis has been successfully used in structural engineering for the detection of damage in concrete and reinforced concrete. However, for further detection of crack development and crack patterns common detection methods can not be effective from the heart. Therefore, this paper proposes a method based on AE analysis of concrete internal damage point positioning. In this paper, we establish a two-dimensional and three-dimensional acoustic emission model for the effective components of the random distribution of concrete. The elastic wave field is simulated by the finite difference method based on the model. Using the time domain inversion transformation to locate the damage location and the maximum energy can be used in the model.This paper studies the localization method based on the wave propagation process and the inversion method. time domain inversion transformation is in exploration geophysics get considerable development. In this paper from related research methods, on concrete specimens based on signal of acoustic emission(AE) collection and analysis to the concrete failure of acoustic emission signal. Subsequently, the signals are inverted in time sequence, and the time domain inversion transformation is used as the initial boundary condition of the positioning operation, and re launch the test block in the original acquisition position. These elastic waves like rewind in the test block internal back-propagation until the time is zero, the final elastic wave will arrive at the focal position and focal position in the formation of resonance, so the emission source location phenomenon of energy concentration. By using this phenomenon, the maximum energy concentration method is proposed in this paper. As a validation of the method, this paper obtained by CT imaging line measurements damage model to verify the accuracy of time domain inversion transformation.Acoustic emission has the characteristics of non destructive and real time, it can understand the growth of concrete damage crack, and make a timely remedy or disaster warning. The research shows that time domain inversion transformation is suitable for the health monitoring of concrete. The acoustic emission caused by cracking of concrete can be successfully located by time domain inversion transformation.