Three-dimensional braided composite material damage source positioning method and device

A composite material and three-dimensional weaving technology, which is applied in positioning, analyzing materials, measuring devices, etc., can solve problems such as damage to three-dimensional weaving composite materials, and positioning methods that cannot meet the requirements of precise positioning.

Active Publication Date: 2020-10-23
丁刚
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the present invention aims to propose a method for locating damage sources of three-dimensional braided composite materials to solve the problem that the single positioning method in the above-mentioned background technology cannot meet the requirements of precise positioning

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  • Three-dimensional braided composite material damage source positioning method and device
  • Three-dimensional braided composite material damage source positioning method and device
  • Three-dimensional braided composite material damage source positioning method and device

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Embodiment Construction

[0074] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0075] In describing the present invention, it is to be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", " The orientations or positional relationships indicated by "vertical", "horizontal", "top", "bottom", "inner" and "outer" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and Simplified descriptions, rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and thus should not be construed as limiting the invention. In addition, the terms "first", "second", etc. are used for descriptive purposes only, and should not be understood a...

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Abstract

The invention provides a method for positioning a damage source of a three-dimensional braided composite material. The method comprises the following steps of initially positioning the damage source by adopting a four-point arc positioning method; and adopting an improved probabilistic neural network to accurately position the damage source of the composite material. The method is advantaged in that a four-point arc positioning algorithm is selected for preliminary positioning of the three-dimensional braided composite material acoustic emission source, a sound velocity error is corrected according to the anisotropism characteristic of the three-dimensional braided composite material, and positioning precision is improved; the key parameters of the probabilistic neural network are optimized by using the fruit fly optimization algorithm, so the mode recognition capability of the probabilistic neural network is improved, and accurate positioning is realized.

Description

technical field [0001] The invention belongs to the field of composite materials, in particular to a method and device for locating damage sources of three-dimensional braided composite materials. Background technique [0002] Acoustic emission source location is one of the important purposes of acoustic emission nondestructive testing, and the location accuracy reflects the degree of agreement between the identified location and the actual damage location. The premise of the traditional AE source location is to determine the propagation velocity of the sound wave in the solid medium, and determine the location of the AE source by the time difference between the sound waves arriving at the two sensors. However, three-dimensional braided composite materials have anisotropic characteristics, and the speed of sound waves is not only related to material properties and plate thickness, but also related to the propagation angle, and environmental factors such as temperature and hu...

Claims

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Application Information

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IPC IPC(8): G01N29/14G01N29/44G01S5/28G06N3/04G06N3/08
CPCG01N29/14G01N29/4481G01N29/4472G01S5/28G06N3/086G01N2291/011G01N2291/0231G01N2291/0289G01N2291/10G06N3/047
Inventor 丁刚
Owner 丁刚
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