A Resolution Enhancement Method of Dispersion 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: 2019-08-23
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
View PDF3 Cites 1 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
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.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[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 2780 0...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
Provided is a method for enhancing the resolution of a dispersive Lamb wave signal, which belongs to the field of Lamb wave structure health monitoring. The method comprises the following steps: (1) acquiring a dispersion wave number curve and a non-dispersion wave number curve of a Lamb wave mode; (2) calculating a transfer function of Lamb wave signal propagation; (3) obtaining, by means of calculation, a Lamb wave distance domain pulse response signal with distance delay amplified; (4) calculating a Lamb wave distance domain narrow-band excitation signal; (5) obtaining, by means of calculation, a distance domain sensing signal with distance delay amplified; and (6) calculating a high-resolution distance domain sensing signal with distance scale recovered. The present invention further increases an interval of adjacent wave packets in a Lamb wave signal in a distance domain by means of distance delay amplification on the basis of compensating Lamb wave signal dispersion and recompressing original frequency dispersion expanded Lamb wave signal packets, thereby improving the spatial resolution of the Lamb wave signal.
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...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/34B06B1/06G01N29/04
Inventor 蔡建袁慎芳汪晓鹏邱雷
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS