Impact load location method based on multiple signal classification algorithm

A technology of multiple signal classification and positioning methods, which is applied in the field of structural impact load position identification, can solve problems such as instability, difficulty in impact monitoring, and heavy training workload, and achieve the effects of ensuring safe operation, high positioning accuracy, and preventing accidents

Active Publication Date: 2012-07-04
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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AI Technical Summary

Problems solved by technology

Due to too many unknown parameters to be solved and heavy calculation tasks, it is difficult to meet the real-time requirements of online monitoring
The load identification method based on artificial intelligence can solve the load identification problem, but the model used for load identification needs to be trained by the method of obtaining response samples from the actual loading method or analytical solution, which can only be used for the training of the known structure and the structure The amount of load is large, and the structure after training is also unstable when the actual load is identified. Therefore, it is still difficult to apply to the practical problem of impact monitoring.

Method used

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  • Impact load location method based on multiple signal classification algorithm
  • Impact load location method based on multiple signal classification algorithm
  • Impact load location method based on multiple signal classification algorithm

Examples

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Embodiment

[0083] The test piece is a T-30 carbon fiber composite laminate with a size of 610×610×2mm, and the four sides are fastened to the fixture by screws. The material of the carbon fiber layup is T300 / QY8911, and the layup sequence is [45 / 0 / -45 / 90 / 0 / 45 / 0 / -45 / 0] S . A uniform linear array composed of 7 identical piezoelectric sheets is adopted, and the distance between the centers of two adjacent piezoelectric sheets is 1.1 cm. The array elements are numbered from 0 to 6 from left to right, with the center of the 0 piezoelectric sheet as the coordinate origin, the axis of the piezoelectric array as the real axis, and the direction perpendicular to the array as the normal direction. Such as image 3 shown. The sensing element is a PZT-5 piezoelectric film with a diameter of 8mm and a thickness of 0.48mm. The impact tool is a spring mechanical impact rod with two levels of impact energy. The top of the impact head is hemispherical with a diameter of 10mm, such as image 3 shown....

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Abstract

The invention discloses a structural impact load location method based on multiple signal classification algorithm, comprising the following steps: step 1: collecting impact response signals; step 2: conducting estimation of direction-of-arrival of impact source by utilizing the multiple signal classification algorithm; and step 3: conducting estimation of distance of the impact source according to the propogation characteristic of Lamb wave. The method in the invention is convenient and reliable, can perform real-time and online monitoring to the impact; and has high-precision impact location and strong instantaneity.

Description

technical field [0001] The invention relates to a structural impact load position identification method based on the MUSIC algorithm in the array signal processing technology, which belongs to an engineering structure health monitoring method. Background technique [0002] With a series of advantages such as high specific strength, high specific stiffness, good fatigue resistance and designable material properties, composite materials have been increasingly widely used in aviation, aerospace, automotive and other engineering fields, especially in military and civil aircraft. Advanced composite structures have begun to be increasingly used. However, laminate composites will inevitably bear the impact of various energy objects during their service, such as the impact of hail, the collision of aircraft wings with birds in the air, the aircraft being shot and tools often falling on the aircraft during maintenance. surface etc. These impacts can easily cause damage such as inte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M7/08G01B7/02
Inventor 袁慎芳苏永振邱雷梁栋张炳良
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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