CN106651891B - Surface parameter measurement method for three-dimensional braided fabric composite material prefabricated member - Google Patents
Surface parameter measurement method for three-dimensional braided fabric composite material prefabricated member Download PDFInfo
- Publication number
- CN106651891B CN106651891B CN201610898613.0A CN201610898613A CN106651891B CN 106651891 B CN106651891 B CN 106651891B CN 201610898613 A CN201610898613 A CN 201610898613A CN 106651891 B CN106651891 B CN 106651891B
- Authority
- CN
- China
- Prior art keywords
- image
- composite material
- fabric
- pitch
- dimensional
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/20—Special algorithmic details
- G06T2207/20048—Transform domain processing
- G06T2207/20061—Hough transform
Landscapes
- Treatment Of Fiber Materials (AREA)
Abstract
The invention relates to a method for measuring surface parameters of a three-dimensional braided fabric composite material prefabricated member, namely braiding angle and flower pitch, which comprises image preprocessing based on partial differential equation, edge extraction based on phase consistency, and braiding angle and flower pitch measurement based on Hough transformation straight line extraction. The invention can measure the average braiding angle and each flower pitch of the three-dimensional braided composite material prefabricated member image.
Description
Technical Field
The invention relates to a method for measuring surface parameters of a three-dimensional braided composite material prefabricated member, which has a good measurement effect on the surface parameters of the three-dimensional braided composite material prefabricated member made of carbon fiber materials, belongs to the technical field of image processing, and can be applied to measurement of the surface parameters of the prefabricated member in the three-dimensional braided field, namely, braiding angles and flower pitches.
Background
The three-dimensional braided fabric composite material is a novel high-performance composite material, has obvious advantages compared with other materials, has the excellent characteristics of high specific strength, high specific modulus, high damage tolerance, fracture toughness, impact resistance, cracking resistance, fatigue resistance and the like, and has obvious advantages in the aspects of designability, integral formability, net section manufacturing and the like. The three-dimensional braided fabric composite material has become an important structural material in the fields of aviation and aerospace, and has been widely applied in the fields of automobiles, medical treatment, sports and the like. Along with the increasing demands of the fields of aerospace, military instruments, medical services and the like on high-performance composite materials, the three-dimensional textile composite material can effectively overcome the defects of layering, cracking, low strength in the thickness direction, poor impact damage resistance and the like of the traditional composite materials, and has the excellent performances of high strength, impact resistance, layering resistance, high temperature resistance, flexible structural design, excellent comprehensive mechanical properties and the like. Different three-dimensional woven composite preforms produce different properties, and parameters of the preform need to be measured and controlled in order to better understand the properties of the composite, with the surface parameters weave angle and pitch being important parameters reflecting the internal structure and properties of the preform.
The surface knitting angle theta refers to the angle formed by the fiber bundles on the surface of the three-dimensional knitted fabric and the axial direction of the fabric. The stitch pitch h, which refers to the length produced along the knitting direction in one machine knitting cycle; a schematic diagram of the braiding angle and the flower pitch is shown in fig. 2, wherein fig. 2-1 is the ideal braiding angle and the flower pitch, and fig. 2-2 is the actual braiding angle and the flower pitch.
At present, the measurement of the two surface parameters is mostly manual measurement, and the method has strong subjective dependence and low efficiency. Therefore, the establishment of the method for measuring the surface parameters of the three-dimensional braided fabric composite material prefabricated member has important significance for improving the detection level of textile industry. In recent years, computer technology and digital image processing technology have been greatly developed and have been successfully used in the textile industry. The research results in the related fields enable detection and analysis of the tissue structure of the fabric to be possible by using a digital image processing technology.
The research results of the existing fabric surface parameter measurement mainly comprise the following methods: three-point angle measurement, four-point angle measurement [1]; a measurement of the average braiding angle based on the fourier power spectrum [2]; measurement of braiding angle based on curve fitting [3]; automated measurement of flower-node length based on wavelet transform multi-resolution analysis [4].
In these methods, there are still some problems. Firstly, a three-point angle measurement method and a four-point angle measurement method are needed to manually point a fabric image on a computer display screen, and the method has strong subjective dependence and low automation degree; based on the measurement of the braiding angle of the curve fitting method, the quality of the measurement result depends on the quality of curve fitting; the length of the flower node is measured based on a wavelet transformation multi-resolution analysis method, and the method depends on the interception of a fabric image template and the solving of related parameters. Therefore, a method which is efficient, accurate and capable of measuring the average braiding angle and the pitch of each flower is of great significance for analyzing the internal structure of the prefabricated member and the like.
Reference to the literature
[1] Wu Delong, shen Huairong. Mechanical Properties of textile composite [ M ]. Changsha: national defense university of science and technology press, 1988, 30-34
[2]Wan，Z.K.，& Li，J.L.(2006).Braided angle measurement technique for three-dimensional braided composite material preform using mathematical morphology and image texture.AUTEX Research Journal，6(1)，30-39.
[3] Mo Zhenkai, shen Junhui, wang Xishan. Composite preform braiding angle measurement study. Journal of textile, 2004, 25 (3): 42-43.
[4] Gong Liying, mo Zhenkai. Automatic measurement System of the length of the flower sections of the woven composite preform [ J ]. Computer measurement and control. 2006, 14 (6): 730-733.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method capable of measuring the surface parameter knitting angle and the flower pitch of a three-dimensional knitted composite material prefabricated member. Therefore, the invention adopts the following technical scheme.
The method for measuring the surface parameters of the braiding angle and the spline pitch of the three-dimensional braided composite material prefabricated member comprises the following steps:
step 1: preprocessing the acquired image based on partial differential equation to obtain an image F pt ；
Step 2: for image F pt Edge detection based on phase consistency is carried out to obtain an image F pc ；
Step 3: for image F pc Performing straight line extraction based on Hough transformation, and determining reference angles of two texture directions of the braided fabric;
step 4: measuring the weaving angle of the fabric;
step 5: the fabric pitch was measured.
The invention has the following technical effects:
1. the average knitting angle and each flower pitch can be detected simultaneously, and the measuring effect is good.
2. Favoring application.
Drawings
Fig. 1: the invention relates to an integral design drawing of a surface parameter measurement method of a three-dimensional braided fabric composite material prefabricated member.
Fig. 2: braiding angle θ and stitch pitch h are schematically shown. Fig. 2-1 is an ideal case of braiding angle and flower pitch. Fig. 2-2 shows the actual braiding angle and the flower pitch.
Fig. 3: the original acquired image and the preprocessed image. FIG. 3-1 shows an image of an original acquisition, and FIG. 3-2 shows a graph F after partial differential equation preprocessing pt FIGS. 3-3 are diagrams of F pt Graph F after phase consistency edge detection pc 。
Fig. 4: FIG. 4-1 is FIG. F pc The image rotated 45.8 deg. is shown in FIG. 4-2 as F pc Gray level histogram of the image rotated 45.8 °.
Fig. 5: FIG. 5-1 is FIG. F pc The image after 126.4℃rotation is shown in FIG. 5-2 as F pc Gray level histogram of the image rotated by 126.4 °.
Detailed Description
The method of the invention is shown in fig. 1 and comprises the steps of partial differential equation-based image preprocessing, phase consistency-based edge extraction, hough transformation-based straight line extraction, and measurement of knitting angles and flower pitches. The following describes the implementation process of the technical scheme of the invention with reference to the attached drawings.
1) The partial differential equation pre-processes the acquired image: converting an image processing process into a partial differential equation solving process, wherein the method regards an image as a continuous signal, writes an image processing operation into a partial differential operator, and realizes fabric image preprocessing by solving the partial differential equation taking an original image as an initial value to obtain an image F pt ；
Wherein G is σ Is Gaussian function, satisfy
G σ (x，y)＝Cσ -1/2 exp(-(x 2 +y 2 )/4σ)
Where σ is a parameter related to the variance of the gaussian function, different σ defining different degrees of smoothness.
Means estimating edges at the scale t and then using this information to determine the extent of diffusion to avoid excessive diffusion at the edge points;
2) Edge extraction based on phase consistency:
the basic concept of phase consistency is to take the point in the image where the fourier components are most consistent in phase as the feature point. Taking the fourier series expansion of some simple functions as an example, when the square wave is expanded into the fourier series, all fourier components are sine waves, and at the step point, each harmonic component has the same phase (the phase is 0 degrees or 180 degrees depending on whether the point is located at the rising edge or the falling edge), while the single phase values of other points are all changed, and the degree of phase coincidence is lower; for triangular waves, the harmonic components are most phase-coincident at the vertices (i.e., at the peaks and troughs, 90 degrees or 270 degrees in phase);
3) Straight line extraction based on Hough transformation, and image F pc Transforming to a parameter space, obtaining a set conforming to a straight line by calculating the local maximum value of the accumulated result as a Hough transformation result, and determining the reference angles theta of the braid texture in two directions 1 、θ 2 ；
4) Measurement of braiding angle: rotating the image by θ 1n Degree and X-axis gray level projection G (X) is carried out on the image, and projection variance S is calculated 1 And find the maximum S 1MAX Corresponding theta 1nmax Wherein: θ 1n ＝θ 1 +n×0.1°，-50≤n≤50，
Find S in the same way 2MAX Corresponding theta 2nmax The surface knitting angle of the three-dimensional fabric is +.>
5) Measurement of flower pitch: respectively calculating the peak and peak pixel distance difference d between different periods of the projection graphs in two directions 1 And d 2 I.e. the distance between pixels in a straight line, according to the cosine theorem
And calculating a pixel-level flower pitch d, and converting the pixel-level flower pitch into an actual flower pitch according to the size calibration result.
The invention provides a method for measuring surface parameters of a three-dimensional braided fabric composite material prefabricated member, which combines partial differential equation, phase consistency and Hough transformation to realize measurement of braiding angle and flower pitch of the three-dimensional braided fabric composite material prefabricated member made of carbon fiber materials.
Claims (3)
1. The method for measuring the surface parameters of the three-dimensional braided fabric composite material prefabricated member comprises the following steps:
step 1: preprocessing the acquired image based on partial differential equation to obtain an image F pt The method converts the image processing process into a partial differential equation solving process, the method regards the image as a continuous signal, writes the image processing operation into a partial differential operator, and realizes fabric image preprocessing by solving the partial differential equation taking the original image as an initial value to obtain an image F pt ，
Wherein G is σ Is Gaussian function, satisfy
Where σ is a parameter related to the variance of the gaussian function, different σ defining different degrees of smoothness,
means estimating edges at the scale t and then using this information to determine the extent of diffusion to avoid excessive diffusion at the edge points;
step 2: for image F pt Edge detection based on phase consistency is carried out to obtain an image F pc ；
Step 3: for image F pc Performing straight line extraction based on Hough transformation, and determining reference angles theta of two texture directions of the braided fabric 1 、θ 2 ；
Step 4: measuring the knitting angle of the fabric, rotating the image by θ 1n The degree and the gray level projection of the X-axis direction are carried out on the image, and the projection variance S is calculated 1 And find the maximum S 1MAX Corresponding theta 1nmax Wherein θ is 1n ＝θ 1 +n×0.1°, n is equal to or greater than-50 and is equal to or less than 50, and the image is rotated by θ in the same way 2n The degree and the gray level projection of the X-axis direction are carried out on the image, and the projection variance S is calculated 2 And find S 2MAX Corresponding theta 2nmax Wherein θ is 2n ＝θ 2 +n×0.1 DEG, -50.ltoreq.n.ltoreq.50, the surface knitting angle of the three-dimensional fabric being
Step 5: measuring the pitch of fabric, and respectively calculating the peak and peak pixel distance difference d between different periods of two direction projection patterns 1 And d 2 I.e. the distance between pixels in a straight line, according to the cosine theorem
The pixel-level flower pitch d is known, and the pixel-level flower pitch is converted into an actual flower pitch according to the size calibration result.
2. The method for measuring surface parameters of three-dimensional braid composite material preform according to claim 1, wherein in step 2, image F is taken pt Performing Fourier transformation, and taking the point with the most consistent Fourier component phases as a characteristic point to obtain an image F after edge detection pc 。
3. The method for measuring surface parameters of three-dimensional braid composite material preform according to claim 1, wherein in step 3, image F is taken pc Transforming to parameter space, obtaining a set conforming to a straight line by calculating the local maximum value of the accumulated result as Hough transformation result, and determining the reference angle theta of two texture directions of the braided fabric 1 、θ 2 。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610898613.0A CN106651891B (en) | 2016-10-13 | 2016-10-13 | Surface parameter measurement method for three-dimensional braided fabric composite material prefabricated member |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610898613.0A CN106651891B (en) | 2016-10-13 | 2016-10-13 | Surface parameter measurement method for three-dimensional braided fabric composite material prefabricated member |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106651891A CN106651891A (en) | 2017-05-10 |
| CN106651891B true CN106651891B (en) | 2023-05-09 |
Family
ID=58856414
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610898613.0A Active CN106651891B (en) | 2016-10-13 | 2016-10-13 | Surface parameter measurement method for three-dimensional braided fabric composite material prefabricated member |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106651891B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113989314A (en) * | 2021-10-26 | 2022-01-28 | 深圳前海环融联易信息科技服务有限公司 | Method for removing header and footer based on Hough transform linear detection |
| CN117437270B (en) * | 2023-12-21 | 2024-03-19 | 江苏恒力化纤股份有限公司 | Fabric texture regularity calculation method based on Fourier transform |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102109498A (en) * | 2009-12-28 | 2011-06-29 | 天津工业大学 | Nondestructive testing system and testing analysis method for three-dimensional braided composite material |
| CN102564332A (en) * | 2010-12-27 | 2012-07-11 | 天津工业大学 | Method for embedding FBG (Fiber Bragg Grating) sensors into three-dimensional weaving composite material parts |
| CN102788793A (en) * | 2012-03-31 | 2012-11-21 | 江南大学 | Method for measuring density of weft knitted fabric based on spectrum analysis |
| CN103234969A (en) * | 2013-04-12 | 2013-08-07 | 江苏大学 | Method for measuring fabric weft density based on machine vision |
| CN104359403A (en) * | 2014-11-21 | 2015-02-18 | 天津工业大学 | Plane part size measurement method based on sub-pixel edge algorithm |
| CN104483316A (en) * | 2014-12-30 | 2015-04-01 | 南通大学 | On-line density measuring instrument for three-dimensional braided fabrics |
| CN105387814A (en) * | 2015-12-04 | 2016-03-09 | 天津工业大学 | Automatic measurement system for surface parameters of prefabricated component of three-dimension braiding composite material |
-
2016
- 2016-10-13 CN CN201610898613.0A patent/CN106651891B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102109498A (en) * | 2009-12-28 | 2011-06-29 | 天津工业大学 | Nondestructive testing system and testing analysis method for three-dimensional braided composite material |
| CN102564332A (en) * | 2010-12-27 | 2012-07-11 | 天津工业大学 | Method for embedding FBG (Fiber Bragg Grating) sensors into three-dimensional weaving composite material parts |
| CN102788793A (en) * | 2012-03-31 | 2012-11-21 | 江南大学 | Method for measuring density of weft knitted fabric based on spectrum analysis |
| CN103234969A (en) * | 2013-04-12 | 2013-08-07 | 江苏大学 | Method for measuring fabric weft density based on machine vision |
| CN104359403A (en) * | 2014-11-21 | 2015-02-18 | 天津工业大学 | Plane part size measurement method based on sub-pixel edge algorithm |
| CN104483316A (en) * | 2014-12-30 | 2015-04-01 | 南通大学 | On-line density measuring instrument for three-dimensional braided fabrics |
| CN105387814A (en) * | 2015-12-04 | 2016-03-09 | 天津工业大学 | Automatic measurement system for surface parameters of prefabricated component of three-dimension braiding composite material |
Non-Patent Citations (2)
| Title |
|---|
| 基于小波变换的复合材料预制件表面纹理分析;沈俊辉;《中国优秀博硕士学位论文全文数据库(硕士)工程科技Ⅰ辑》;20030915;全文 * |
| 基于角向功率谱的复合材料预制件表面编织角的测量;苏华;《天津工业大学学报》;20040229;第23卷(第1期);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106651891A (en) | 2017-05-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP6359665B2 (en) | Methods for characterizing composite parts | |
| CN105593669B (en) | Image analysis apparatus and program | |
| CN106651891B (en) | Surface parameter measurement method for three-dimensional braided fabric composite material prefabricated member | |
| CN103234969B (en) | Method for measuring fabric weft density based on machine vision | |
| CN105387814B (en) | A kind of D braided composites preform surfaces parameter automatic measurement system | |
| Zhang et al. | A review of fabric identification based on image analysis technology | |
| Fang et al. | Micro-tomography based geometry modeling of three-dimensional braided composites | |
| Holmes et al. | Digital image and volume correlation for deformation and damage characterisation of fibre-reinforced composites: A review | |
| CN105261006B (en) | Medical image segmentation algorithm based on Fourier transformation | |
| Xu et al. | Intelligent analysis technology of bamboo structure. Part II: The variability of radial distribution of fiber volume fraction | |
| Sherman et al. | Mesoscale characterization of continuous fiber reinforced composites through machine learning: Fiber chirality | |
| Rosen et al. | A method for reverse engineering of material microstructure for heterogeneous CAD | |
| Zhang et al. | An overview of the application of image processing technology for yarn hairiness evaluation | |
| Wang et al. | Statistical analysis of yarn feature parameters in C/epoxy plain-weave composite using micro CT with high-resolution lens-coupled detector | |
| CN110335287A (en) | The extracting method and device of Architectural drawing data | |
| Li et al. | Microstructure characteristics of nonwoven geotextiles using SEM and CT methods | |
| Kim et al. | Evaluation of fabric pilling using hybrid imaging methods | |
| CN115222914A (en) | Aggregate three-dimensional morphology spherical harmonic reconstruction method based on three-dimensional point cloud data | |
| Zhenkai et al. | Braided angle measurement technique for three-dimensional braided composite material preform using mathematical morphology and image texture | |
| Qin et al. | Analysis and research of the fabric density based on the wavelet transform | |
| Yang et al. | Iterative excitation with noise rejection techniques for X-ray computed tomography of hollow turbine blades | |
| Yildiz et al. | A new approach to the determination of warp-weft densities in textile fabrics by using an image processing technique | |
| Ershov et al. | Method for measuring the braid angle and its deviation from the specified value in braided preforms using image analysis | |
| Chapoullié et al. | Orientation-guided two-scale approach for the segmentation and quantitative description of woven bundles of fibers from three-dimensional tomographic images | |
| Jeong et al. | A Comparison of Surfacelet-Based Methods for Recognizing Linear Geometric Features in Material Microstructure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |