Acoustic emission source positioning method suitable for three-dimensional structure

Abstract

The invention relates to an acoustic emission source positioning method suitable for a three-dimensional structure, belongs to the technical field of sound source positioning, and the position of theacoustic emission source is positioned through the time difference information and the space information of the right-angled tetrahedron type sensor array. The method comprises the following steps: establishing a three-dimensional sound emission source positioning sensor array, recording and storing sound wave signals from a sound source received by each sensor, analyzing a sound wave signal graphto obtain a required time difference, and determining the position of the sound source according to the time difference. The method is not only suitable for isotropic materials, but also can be wellsuitable for anisotropic materials; only eight ultrasonic sensors are needed, so that the cost of the continuous monitoring structure can be greatly reduced; any iterative algorithm is not needed, andthe positioning precision and speed are effectively improved. The invention provides a new method for sound source localization in acoustic emission detection, guarantees the safety of the structureby discovering damage and potential threats in time, and has a good application prospect in the fields of spaceflight and navigation, civil engineering, large and small machinery and the like.

Description

technical field [0001] The invention relates to the technical field of sound source localization, in particular to an acoustic emission source localization method suitable for three-dimensional structures. Background technique [0002] Three-dimensional structures are widely used in the fields of pressure vessels, large complex engineering structures, satellites, aircraft and aerospace. However, sound source localization in 3D structures is a challenging task, especially when the structural material properties are unknown or even anisotropic. At this time, a large number of unknown parameters requires a large number of sensor arrays or complex iterative calculations for accurate source localization. [0003] Acoustic emission technology is an important dynamic non-destructive testing method. Transient elastic stress waves are transmitted to the surface of the material through the local material due to the rapid release of energy, which is received by the sensor and causes t...

AI Technical Summary

Problems solved by technology

Aiming at the situation that the three-dimensional structural characteristics cannot be obtained in advance, the present invention proposes an acoustic emission source positioning method that only needs a small number of ultrasonic sensors, and describes the theoretical relationship of the method and verifies it experimentally

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