Quantitative monitoring method of dimensional damage

Abstract

The invention belongs to the techniques of nondestructive testing and structural health monitoring and relates to a quantitative monitoring method of dimensional damage. In the quantitative monitoring method of the dimensional damage, a wave signal is stimulated and received by sensor networks distributed in a to-be-detected region, circular positioning curves are formed by internal loopback positioning modes of the sensors, and oval positioning curves are formed by pitch-catch positioning modes of the sensors. Internal regions formed by intersecting and surrounding of the circular positioning curves and oval positioning curves are edge positions of the dimensional damage determined by the quantitative monitoring method of dimensional damage. The area of the dimensional damage can be acquired by carrying out integration on damage regions obtained by the positioning curves, and the quantitative monitoring is realized. Compared with the prior art, the quantitative monitoring method of the dimensional damage has the advantages that the positions of the dimensional damage are given out, the size of the area of the dimensional damage can be further fast and accurately given out, the distribution of the sensors is simple, the calibration is unnecessary, the costs of structural inspection and maintenance of large equipments can be greatly reduced, and the safety of the structure can be increased.

Description

technical field [0001] The invention belongs to nondestructive testing and structural health monitoring technology, and relates to a two-dimensional damage quantitative monitoring method. Background technique [0002] Under the long-term action of cyclic loads and various extreme environments, the key structures of aircraft and other mechanical equipment may be damaged, such as corrosion and deformation of metal structures, delamination and debonding of composite structures, etc. If these damages are not detected and repaired in time, they will cause great safety hazards. The current non-destructive testing methods mainly use some external equipment to regularly test the structure. When testing some internal structures, the equipment structure often needs to be disassembled, which will not only reduce the service time of these equipment, but also increase the maintenance cost of these equipment. [0003] At present, more attention is paid to the integrated structural health...

AI Technical Summary

Problems solved by technology

[0004] However, in practical applications, the currently developed damage size quantification methods still have certain shortcomings.

For example, if a dense phased array network is arranged for a large number of structures, it will increase the weight of the system, and at the same time increase the complexity of circuit layout and wave signal processing; If the complex structure of the model and the damage of different positions and sizes are calibrated, the workload of the experiment will be very huge.

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