A Method for Impact Localization of Composite Plates Based on Rotation Invariant Subspace

A composite material plate, rotation invariant technology, applied in the direction of analyzing materials, using sound waves/ultrasonic waves/infrasonic waves for material analysis, processing detection response signals, etc., to achieve strong real-time performance, simple and reliable methods, and save calculation time.

Active Publication Date: 2021-07-20
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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  • A Method for Impact Localization of Composite Plates Based on Rotation Invariant Subspace
  • A Method for Impact Localization of Composite Plates Based on Rotation Invariant Subspace
  • A Method for Impact Localization of Composite Plates Based on Rotation 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] like 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 material plate structure, and the distance between the sensors is set to 10 mm 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 ...

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Abstract

The invention discloses an impact positioning method for a composite material plate based on a rotation invariant subspace, comprising the following steps: collecting the impact signal of the composite material plate; The rotation invariant subspace algorithm is used to estimate the wave direction of the shock source; the distance to the shock source is estimated by combining the local mean decomposition and Lamb wave propagation characteristics, and the wave direction of the shock source is used to locate the shock source. The present invention has the following advantages and effects: the method of the present invention is simple and reliable, and the direction of arrival is directly estimated by calculating the rotation invariant factor, without the need to search for spectral peaks in the monitoring area, which greatly saves calculation time and realizes the impact on the composite material plate Online monitoring, strong 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...

Claims

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Application Information

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Patent Type & Authority Patents(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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