Method for enhancing resolution of dispersive Lamb wave signal
A resolution enhancement and dispersion technology, which can be used in the analysis of solids using sonic/ultrasonic/infrasonic waves, the generation of ultrasonic/sonic/infrasonic waves, and the use of vibrating fluids. Resolution, effects for easy signal analysis and processing
Active Publication Date: 2018-03-16
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Judging from the existing data, the proposed methods rarely consider the two aspects of dispersion compensation and Lamb wave signal wave packet resolution optimization to improve the resolution of the dispersed Lamb wave signal, which limits the further improvement of the signal resolution.
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[0044] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described through implementation with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are the embodiment of the present invention. Some, but not all, embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0045] For the convenience of verification, this embodiment adopts the structure of LY21 aluminum plate, the size is 1200mm×1000mm×1.5mm, and the material parameters are shown in Table 1.
[0046] Table 1. Aluminum plate material parameters
[0047] Thickness d(mm)
Density ρ(kg / m 3 )
Poisson's ratio μ
Elastic modulus E(GPa)
1.5
...
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The invention provides a method for enhancing the resolution of a dispersive Lamb wave signal, and belongs to the field of Lamb wave structure health monitoring. The method includes the following steps: (1) obtaining the dispersive wave number curve and the non-dispersive wave number curve of a Lamb wave mode; (2) calculating the transfer function of Lamb wave signal propagation; (3) calculating adistance delay amplified Lamb wave distance domain impulse response signal; (4) calculating a Lamb wave distance domain narrow-band excitation signal; (5) calculating a distance delay amplified distance domain sensing signal; and (6) calculating a distance scale recovered high-resolution distance domain sensing signal. The interval of adjacent wave packets in the Lamb wave signal is further increased through distance delay amplification based on the compensation of the Lamb wave signal dispersion and recompressing original dispersion expanded Lamb wave signal packets, so the spatial resolution of the Lamb wave signal is improved.
Description
technical field [0001] The invention relates to a method for enhancing the resolution of a dispersed Lamb wave signal, belonging to the field of Lamb wave structural health monitoring. Background technique [0002] Structural health monitoring technology uses advanced sensors integrated in the structure to obtain information related to the structural health status online in real time, and combines advanced information processing methods and structural mechanics modeling methods to extract characteristic parameters, thereby realizing online monitoring of the structural health status. Monitoring and Evaluation. Structural health monitoring technology is of great significance for improving the safety of engineering structures and reducing maintenance costs. As a kind of ultrasonic guided wave in thin-plate structures, Lamb wave has a long propagation distance and is sensitive to both internal and surface damage of the structure, so it is widely used in structural health monito...
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IPC IPC(8): G01N29/34B06B1/06G01N29/04
Inventor 蔡建袁慎芳汪晓鹏邱雷
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS