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Material damage positioning device, positioning method and verification method

A technology for positioning devices and material damage, which is applied in the direction of measuring devices, analyzing materials, and using acoustic wave emission technology for material analysis, etc., can solve the problems of reduced bearing capacity and complexity, and achieve low cost, simple equipment, and a small number of sensors.

Pending Publication Date: 2021-10-22
BEIHANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The complex structure of composite materials not only brings superior performance, but also causes burdens in other aspects
Different from traditional homogeneous materials, once composite materials are damaged under long-term fatigue loads and accidental impact loads, their load-bearing capacity will drop rapidly, and because they hardly deform significantly before failure, traditional damage detection methods such as the target It is difficult to find the damage inside by visual inspection or knock inspection

Method used

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  • Material damage positioning device, positioning method and verification method
  • Material damage positioning device, positioning method and verification method
  • Material damage positioning device, positioning method and verification method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] First analyze the method of detecting the azimuth angle of the damage position:

[0046] refer to figure 1 As shown, at least three acoustic emission sensors (S 1 , S 2 and S 3 ) method for detecting the azimuth angle of the damaged position:

[0047] Connect the three receiving sensors S 1 , S 2 and S 3 Mounted on composite material plate, position S1 , S 2 and S 3 The exemplary distance between the three sensors at is set to be d. The following is an example where three sensors are arranged in a right triangle arrangement, if the three sensors S 1 , S 2 , S 3 The coordinates are expressed as (x 1 ,y 1 ), (x 2 ,y 2 ) and (x 3 ,y 3 ). Then it is clear from the right triangle that x 2 =x 1 +d,x 3 =x 1 ,y 2 =y 1 and y 3 =y 1 +d. Let the coordinates of sound source A be (x A ,y A ).

[0048] Suppose three lines AS 1 , AS 2 and AS 3 are parallel, which should be the case when the AE source is far from the sensor, AS 2 -AS 1 =c(α)t 21 , AS...

Embodiment 2

[0061] refer to figure 2 , Figure 7 As shown, the present disclosure provides a material damage localization device, comprising:

[0062] At least two sensor groups, each sensor group illustratively includes three acoustic emission sensors, in this embodiment, three acoustic emission sensors in the same group are exemplary arranged on the three vertices of a right triangle, and the sensor groups use It is installed on the material to be tested and receives the sound wave signal reflected by the damage position at different positions. The two sensor groups are the first sensor group and the second sensor group, which can be at the first preset distance from the area to be tested. A first sensor group is provided at , wherein the first sensor group includes at least the sensor S 1 , sensor S 2 , sensor S 3 , the first sensor group can measure the direction angle α of the damage position relative to the position of the first sensor group 1 ; A second sensor group is provid...

Embodiment 3

[0066] refer to image 3 As shown, in one implementation, the sensor group includes four acoustic emission sensors, and the four acoustic emission sensors in the same group (S 1 , S 2 , S 3 , S 4 ) are arranged on the four vertices of the square, where the sensor S 1 , sensor S 2 , sensor S 4 Can form a group of sensors, sensor S 2 , sensor S 4 , sensor S 3 Can form a group of sensors, sensor S 4 , sensor S 3 , sensor S 1 Can form a group of sensors, sensor S 3 , sensor S 1 , sensor S 2 A group of sensor groups can be formed, and one sensor group can form four small sensor groups at the same position. Through the signal time information detected by any three acoustic emission sensors mentioned above, a direction angle α can be calculated, and multiple directions detected The angle α can be mutually verified, and at the same time, the 4 direction angles obtained by the 4 isosceles right triangle sensor groups can be normalized to reduce errors. Two sets of square...

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Abstract

The invention discloses a material damage positioning device, a positioning method and a verification method. The positioning device comprises at least two sensor groups and a position calculation module; each sensor group comprises at least three acoustic emission sensors, a first sensor group is arranged at a first preset distance from a to-be-detected area, and a second sensor group is arranged at a position with a second preset distance from the to-be-detected area; and the position calculation module is connected with the acoustic emission sensors in the sensor group and is used for calculating the damage position according to the signals received by the sensor group. The method is low in cost, does not need to consume more manpower and material resources, is simple in equipment, is small in number of sensors, is simple in layout of the sensors, is wide in positioning range, does not need priori knowledge, is suitable for the composite material, and does not need to know the propagation velocity distribution and mode of a damage signal in the anisotropic composite material compared with a conventional positioning algorithm, and a nonlinear system equation does not need to be solved.

Description

technical field [0001] The disclosure belongs to the technical field of material damage location, and in particular relates to a material damage location device, a location method and a verification method. Background technique [0002] The laminated structure of composite materials has a series of advantages such as high specific strength, high specific stiffness and designable material properties. It is an ideal structural material for large civil aircraft, and it is widely used in aviation, aerospace and other fields. The complex structure of composite materials not only brings superior performance, but also creates burdens in other aspects. Different from traditional homogeneous materials, once composite materials are damaged under long-term fatigue loads and accidental impact loads, their load-bearing capacity will drop rapidly, and because they hardly deform significantly before failure, traditional damage detection methods such as the target It is difficult to find t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/14G01N29/22
CPCG01N29/14G01N29/22
Inventor 袁梅梅帅杰董韶鹏崔晋赵涓如屈玉丰许犇李天源
Owner BEIHANG UNIV
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