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Aircraft thin-wall structure simulation detection system and detection method thereof

A technology of thin-walled structure and detection method, applied in instruments, measuring devices, scientific instruments, etc., can solve the problem of low imaging accuracy, and achieve the effect of precise and specific results

Pending Publication Date: 2022-06-07
NORTHWESTERN POLYTECHNICAL UNIV
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  • Description
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  • Application Information

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Problems solved by technology

However, the traditional OMP algorithm can only achieve small damage imaging, the main reason is that for a few pixels in a small area, due to the relatively small distance, the propagation time difference of the Lamb wave is almost equal to 0, resulting in In order to achieve the sparse representation of the signal by finding the best matching atom when the OMP algorithm is used, only one pixel can be obtained in the corresponding area as the main damaged pixel. point, ignoring other possible damaged pixels
Therefore, through the traditional OMP algorithm, the pixel points must be equal to the size of the damage in order to better realize damage localization imaging, which results in low imaging accuracy; and when the pixel points are small, it is difficult to realize the detection of existing damage in the structure. Lesion Imaging in Larger Lesions

Method used

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  • Aircraft thin-wall structure simulation detection system and detection method thereof
  • Aircraft thin-wall structure simulation detection system and detection method thereof
  • Aircraft thin-wall structure simulation detection system and detection method thereof

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experiment example

[0117] Specific experimental examples are given below to further illustrate the technical effect of the technical solution.

[0118] The content of this experimental example uses Abaqus finite element simulation to simulate the existence of single type damage or multiple types of damage in thin-walled structures, and then perform damage imaging based on the data obtained from the simulation, and finally analyze the detection method by evaluating the damage imaging performance. The size of the thin-walled structure used in the simulation is 500 × 500 × 2 mm, and a five-period Lamb wave with a center frequency of 100 modulated by a Hann window is excited. Lamb waves. In this section, by comparing the damage images obtained by the thin-wall defect damage method in this embodiment with the existing method, the performance of the simulation detection method for aircraft thin-walled structures provided in this embodiment is analyzed.

[0119] In this experimental example, firstly, ...

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Abstract

The invention relates to the field of modern aircraft large-size structure damage detection, in particular to an aircraft thin-wall structure simulation detection method and system. Detection is carried out based on Lamb waves, and the system comprises a plurality of spliced thin-wall structures and array sensors arranged on the thin-wall structures. The array sensor comprises N sensors arranged in the form of a phased array and is used for generating an excitation signal and receiving a response signal of a target; the detection device is used for determining whether damage exists on the thin-wall structure or not based on the relation between the response signal and the excitation signal; the plurality of thin-wall structures are connected in a gluing manner; according to the embodiment of the invention, the existing sparse representation is fused with the elliptical imaging algorithm, the relation between the damage scattering signal and the damage position is established by acquiring the sparse characteristic of the monitoring signal and the accurate judgment of the elliptical imaging algorithm for the damage position, the qualitative judgment and quantitative judgment of the damage position are realized, and the accuracy of the damage position is improved. And the result is more accurate and specific.

Description

technical field [0001] The invention relates to the field of damage detection of large-scale structures of modern aircraft, in particular to a simulation detection system for thin-walled structures of aircraft and a detection method thereof. Background technique [0002] Affected by dynamic / static loads, working conditions, material properties and external factors, the structure of modern aircraft often has a trend of performance degradation and more serious structural damage, which will affect its normal operation, and may further lead to potential safety hazards, or even is a catastrophic accident. In addition, in the design and manufacture stage of aircraft, because it is difficult to accurately predict the distribution of factors affecting the structural life in service, even the most perfect design is difficult to avoid the risks brought by changes in service conditions. With the increasingly prominent requirements for the safe, reliable and economical operation of mod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04G01N29/06G01N29/44
CPCG01N29/041G01N29/069G01N29/44G01N2291/023Y02T90/00
Inventor 尚柏林张子豪丑帅周德响宋笔锋张玉刚裴扬
Owner NORTHWESTERN POLYTECHNICAL UNIV
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