Sensitivity matrix ultrasonic inversion method for coating surface and interface integrity parameters

Abstract

The invention discloses a sensitivity matrix ultrasonic inversion method for coating surface and interface integrity parameters, and belongs to the technical field of nondestructive testing. According to the method, a material-oriented feature detection signal regularization strategy is provided by combining model regularization, data regularization and sensitivity matrix analysis on the basis of a propagation mechanism of ultrasonic waves in a coating multi-interface structure according to the requirements of surface and interface integrity multi-parameter high-precision detection of coating defects, geometry, structures, performance and the like. The model regularization adopts analysis, numerical simulation and machine learning to realize theoretical modeling of ultrasonic response signals. According to data regularization, function correlation is established between an ultrasonic detection signal and a theoretical model. Sensitivity matrix analysis converts an unsuitable nonlinear inverse problem into a suitable linear inverse problem, and a coating surface and interface integrity multi-parameter ultrasonic inversion method based on a sensitivity matrix is developed. According to the detection method, the defects of a traditional trial and error method are overcome, and a nondestructive detection technology can be promoted to jump from qualitative and semi-quantitative to accurate quantitative.

Description

technical field [0001] The invention relates to a sensitivity matrix ultrasonic inversion method of integrity parameters of coating surface and interface, which belongs to the technical field of ultrasonic nondestructive testing of materials. Background technique [0002] Functional coatings such as thermal barrier, sealing, and wave absorption can significantly improve the comprehensive performance of components such as heat insulation, sealing, and stealth, and are widely used in the aviation field. The parameters of aerospace functional coatings (hereinafter referred to as "coatings"), such as thickness, surface and interface morphology, tissue structure, sound velocity, density, and elastic modulus, are key indicators for controlling the integrity of the surface and interface of parts. Coatings often have geometric and material coupling characteristics such as anisotropy, heterogeneity, and ultra-thin multi-interface, which lead to complex response mechanisms of ultrason...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a sensitivity matrix ultrasonic inversion method for the integrity parameters of the coating surface and interface, which overcomes the problems of nonlinearity, non-uniqueness and ill-posedness in solving the problem of coating ultrasonic inspection based on experience in the traditional "trial and error method" , by combining model regularization, data regularization and sensitivity matrix analysis, a material-oriented feature detection signal regularization strategy is developed, and the ill-posed nonlinear inverse problem is transformed into a well-posed linear inverse problem, and a sensitivity-based The multi-parameter ultrasonic testing and inversion method of matrix coating surface and interface integrity has high quantitative accuracy and wider application range, and can be extended and applied to other non-destructive testing technologies, which has great economic benefits

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