Composite material board impact positioning method based on rotary invariant subspace

A composite material plate, rotation invariant technology, applied in the direction of analyzing materials, using sonic/ultrasonic/infrasonic waves for material analysis, processing the response signals of detection, etc., to achieve the effect of saving computing time, fast positioning, and strong real-time performance

Active Publication Date: 2019-03-01
温州大学苍南研究院
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Problems solved by technology

There is no report on impact monitoring and localization of composite panels based on local mean decomposition and rotation-invariant subspace algorithms

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  • Composite material board impact positioning method based on rotary invariant subspace
  • Composite material board impact positioning method based on rotary invariant subspace
  • Composite material board impact positioning method based on rotary invariant subspace

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Embodiment Construction

[0041] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0042] Such as figure 1 and figure 2 As shown, in the embodiment of the present invention, a method for impact positioning of a composite material plate based on a rotation invariant subspace is proposed, which includes the following steps:

[0043] S1. Collect the impact signal of the composite material plate. It mainly includes:

[0044] a) A plurality of piezoelectric ceramic sensors of the same type are arranged in an equidistant linear arrangement on the composite plate structure, and the distance between the sensors is set to 10mm to form a linear piezoelectric array;

[0045] b) Set the sampling parameters of the impact location monitoring system, set the sampling frequency to 5MHz, the sampling length to 8000, the pre-acquisition length to 1600, and the trigger threshold of the system to trigger the acquisition to 1V;

[0046] c) When the signal ...

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Abstract

The invention discloses a composite material board impact positioning method based on rotary invariant subspace. The method includes: collecting impact signals of a composite material board; performing local mean decomposition to decompose a broadband impact signal into narrow-band impact signals; estimating the wave incoming direction of an impact source by a rotary invariant subspace algorithm;estimating the distance of the impact source with combination of the local mean decomposition and Lamb wave propagation characteristics, and positioning the impact source on the basis of the wave incoming direction. The method has the following advantages and effects: the method is simple and reliable, wherein by calculating the rotary invariant factor, the arrival direction of the wave is directly estimated without necessity of spectrum peak searching on a monitored zone, so that calculation time is greatly saved. The method achieves online monitoring on impact on the composite material board, and has great real-time performance.

Description

technical field [0001] The invention relates to the field of engineering structure health monitoring, in particular to an impact positioning method for a composite material plate based on a rotation-invariant subspace. Background technique [0002] Composite materials are materials composed of two or more different substances in different ways. It can give full play to the advantages of various materials, overcome the defects of a single material, and expand the application range of materials. Due to the advantages of light weight, high strength, convenient processing and molding, excellent elasticity, chemical corrosion resistance and good weather resistance, composite materials have gradually replaced wood and metal alloys, and are widely used in aerospace, high-speed trains, automobiles, new energy, machinery Manufacturing and other fields. However, composite materials inevitably suffer various impacts during production and service. According to the impact velocity, the...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04G01N29/44
CPCG01N29/045G01N29/4454G01N2291/0237
Inventor 钟永腾张政浩向家伟
Owner 温州大学苍南研究院
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