Abstract
Time difference of arrival (TDOA) method and beamforming method are often individually utilized in the localization of acoustic emission source of a plate. Based on the performances of the two methods, a novel joint localization method for acoustic emission source is proposed in this paper. Firstly, the performances of TDOA method and beamforming method are studied based on the simulation signals. Then, aiming at the advantages and disadvantages of these two methods, a joint localization method is proposed. Finally, the performances of joint localization method are verified by simulation and experiment. Both simulation and experimental results show that the accuracy of the joint localization method is improved, and the calculation amount is greatly reduced in comparison to the TDOA method and the beamforming method.
Highlights
Acoustic emission (AE) is defined as a phenomenon whereby a transient elastic wave is generated by the rapid release of energy from a localized source of damage [1]
The proposed method improves the accuracy of the Time difference of arrival (TDOA) method, and greatly reduces the localization calculation coat of the beamforming method
Analysis of TDOA Method and Beamforming Method Based on the Simulatedrequirements, Signals and it is difficult to change them for the speed of calculation
Summary
Acoustic emission (AE) is defined as a phenomenon whereby a transient elastic wave is generated by the rapid release of energy from a localized source of damage [1]. TDOA method in two-dimensional or three-dimensional large and medium-sized structures generally requires the sensors to be sparsely arranged In response to this situation, McLaskey et al [9] carried out non-destructive testing research based on the beamforming method to achieve the location of AE sources for structural damage in the field of civil engineering. He et al [10] introduced the near-field beamforming method into the processing of AE signals in thin-plate structures, and studied a new method of arranging a small number of sensors in small areas to realize the localization of AE sources.
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