CN107239612A - A kind of cracking connecting-rod modeling method based on plane of disruption three-dimensionalreconstruction - Google Patents
A kind of cracking connecting-rod modeling method based on plane of disruption three-dimensionalreconstruction Download PDFInfo
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- CN107239612A CN107239612A CN201710411312.5A CN201710411312A CN107239612A CN 107239612 A CN107239612 A CN 107239612A CN 201710411312 A CN201710411312 A CN 201710411312A CN 107239612 A CN107239612 A CN 107239612A
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- rod
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
Abstract
The present invention relates to a kind of cracking connecting-rod modeling method based on plane of disruption three-dimensionalreconstruction, using high-precision optical system, connecting rod cracking face cloud data is obtained；Noise, acnode, overlapping point etc. are removed, optimizes cloud data；Triangular mesh is encapsulated, optimizes triangle gridding quality；By detecting curvature, relaxation border is fitted contour line, constructs polygon patch；By NURBS fitting surfaces, plane of disruption threedimensional model is obtained；The plane of disruption of reconstruct is imported into CAD, on the basis of the plane of disruption, by sketch, stretched, the function such as Boolean calculation obtains the threedimensional model of cracking connecting-rod body, connecting rod cap, assembling model.The plane of disruption that the present invention passes through Reverse reconstruction, it is capable of the shape characteristic of true reductive cleavage joint surface of connection rod, compared to the cracking connecting-rod modeling pattern that existing utilization plane replaces the plane of disruption, this method, which has accomplished to set up, meets cracking connecting-rod pattern and the threedimensional model of structure, and the model can be used for the FEM Simulations such as cracking connecting-rod intensity, fatigue study and structure optimization.
Description
Technical field
The invention belongs to Reverse Engineering CAD modeling technique field, and in particular to a kind of cracking connecting-rod plane of disruption is three-dimensional reverse
Reconstruct and geometrical model construction method, more particularly to a kind of cracking connecting-rod modeling method based on plane of disruption three-dimensionalreconstruction.
Background technology
Because connecting rod condition of work is severe, motion state is complicated, intensity, Fatigue Life Research and the connecting rod optimization of connecting rod
Design is required to finite element analysis, calculated.And set up meet connecting rod true profile and physical dimension threedimensional model be into
The premise of row finite element analysis.
Cracking process technology is the state-of-the-art technology of current connecting rod production, in terms of manufacturing procedure, reduction production cost is reduced
With the unrivaled superiority of conventional linkage processing method.What is obtained after fracture subdivision there is interlock feature 3-D in umbo to close
Face, realizes the perfect engagement of gonnecting rod body, lid.The maximum difference of cracking connecting-rod and tradition machining connecting rod is joint surface of connection rod
Form, that is, break to form three-dimensional male and fomale(M＆F) and instead of machining plane.Because connecting rod cracking faying face is in oneself indenting
Right form, belongs to abnormal curved surface, it is difficult to quantify to the plane of disruption, therefore is modeled as problem.
Being presently used for cracking connecting-rod model its plane of disruption that simulation calculates is replaced with plane, without ready-made physics mould
Type.When carrying out the performance evaluations such as bar linkage structure intensity, fatigue life, the model built based on plane can not reflect cracking processing
The true loaded state of connecting rod.In consideration of it, considering the method reconstruct plane of disruption using reverse three-dimensional reconstruction, cracking connecting-rod is set up
Threedimensional model simultaneously carries out structural strength and analysis of Fatigue-life.
Reverse-engineering refers in the case of no design drawing or design drawing are incomplete, according to the production existed
Measurement, the data processing of product model, and the process that the three-dimensional CAD model of product is redesigned is constructed on this basis.It is bent
Face reconstruct is the key technology of reverse-engineering, wherein, NURBS defines the power of aspect in shape, can be than traditional grid
Modeling pattern better controls over the angularity of body surface, so as to be created that more true to nature, lively moulding.It is to sum up shown,
If using the advantage of nurbs surface moulding, Reverse reconstruction cracking face simultaneously builds cracking connecting-rod threedimensional model, and this is a kind of new
Attempt, have broad application prospects.
The content of the invention
To solve the problem of cracking connecting-rod faying face modeling, the present invention provides a kind of cracking based on plane of disruption three-dimensionalreconstruction
Connecting rod modeling method, by reverse-engineering, the three-dimensionalreconstruction of the cracking connecting-rod plane of disruption, reduction fracture are realized using nurbs surface
The real topography feature in face, sets up whole cracking connecting-rod threedimensional model on this basis, for cracking connecting-rod structural strength, just
The finite element simulation calculations such as the optimization design of degree, analysis of Fatigue-life and cracking connecting-rod.
The purpose of the present invention is achieved through the following technical solutions：
A kind of cracking connecting-rod modeling method based on plane of disruption three-dimensionalreconstruction, comprises the following steps：
The qualified connecting rod exemplar of A, acquisition fracture quality, utilizes high-precision optical system, obtains connecting rod cracking millet cake cloud number
According to；
B, pass through detection, remove acnode, overlapping point and noise point optimization cloud data；
C, a cloud is packaged triangular mesh processing, optimize triangle gridding quality；
D, into the polygon stage, by detecting curvature, relaxation border is fitted contour line, and constructing curve piece is repaired polygon
Shape grid defect；
E, by surface parameterization, with NURBS fitting surfaces, obtain plane of disruption threedimensional model；
F, the plane of disruption importing CAD by reconstruct, on the basis of the plane of disruption, by sketch, stretching and Boolean calculation, are split
Gonnecting rod body, the threedimensional model of connecting rod cap are solved, and assembles acquisition cracking connecting-rod threedimensional model.
Step A, the connecting rod exemplar is that the cloud data obtained is scanned using high speed optical tracker, with being cracked in reality
Face shape characteristic realizes complete matching.
Step B is specially：Acnode, the point beyond specified mobile limitation and the overlapping cloud deletion of principal point cloud are will deviate from,
Noise point is reduced by compressive scans data band.
The step of step E, fitting surface with NURBS is：NURBS adjusts the node of curved surface by four side field parameters
Vector weight factor controls shape, according to parametric direction u and direction w, the knot vector created Surfaces.
Compared with prior art, the device have the advantages that being：
1st, the present invention obtains cracking face cloud data using high-precision optical measuring system so that cracking face real topography is special
Obtain to retain.
2nd, the present invention utilizes reverse Engineering Technology, by nurbs surface fit fracture face, effectively solves cracking connecting-rod
This engineering problem of plane of disruption three-dimensionalreconstruction.
3rd, compared to plane faying face, the plane of disruption of Reverse reconstruction can more reflect that the real topography of cracking connecting-rod faying face is special
Levy, the connecting rod 3-D geometric model built on the basis of secondary, available for finite elements such as cracking connecting-rod performance evaluation and structure optimizations
Simulation is calculated, more application value.
Brief description of the drawings
Fig. 1 is the cracking connecting-rod modeling method overall flow figure based on plane of disruption three-dimensionalreconstruction that the present invention is provided；
Fig. 2 is the cracking connecting-rod and plane of disruption exemplar figure for scanning；
Fig. 3 is the plane of disruption cloud data figure obtained after being scanned through；
Fig. 4 is datagram after spots cloud optimization；
Fig. 5 encapsulates network of triangle trrellis diagram；
Graph of a relation between Fig. 6 curved surfaces and control point；
Fig. 7 is nurbs surface fitted figure；
Fig. 8 a are the three-dimensional model diagrams of big end end cap；
Fig. 8 b are the three-dimensional model diagrams of cracking connecting-rod body；
Fig. 8 c are the assembly figures of gonnecting rod body and lid.
Embodiment
The present invention is further discussed below below in conjunction with accompanying drawing.
As shown in figure 1, a kind of cracking connecting-rod modeling method based on plane of disruption three-dimensionalreconstruction, comprises the following steps：
The qualified connecting rod exemplar of A, acquisition fracture quality, utilizes high speed optical tracker to scan cracking face, obtains cracking face
Cloud data, is matched completely with cracking shape characteristic realization in face in reality；
B, pass through detection, delete acnode, overlapping point and noise point optimization cloud data；
C, a cloud is packaged triangular mesh processing, optimize triangle gridding quality；
D, into the polygon stage, by detecting curvature, relaxation border is fitted contour line, and constructing curve piece is repaired polygon
Shape grid defect；
E, by surface parameterization, with NURBS fitting surfaces, NURBS, which passes through four side field parameters and adjusts the nodes of curved surfaces, to swear
Measure with weight factor to control shape, according to parametric direction u and direction w, the knot vector created Surfaces is fitted to nurbs surface；
F, export the three-dimensional cracking face after reconstruct as STEP files, and import CAD, then pass through sketch, stretching and cloth
The threedimensional model of cracking connecting-rod body, connecting rod cap is set up in your computing, and the complete cracking connecting-rod of assembling acquisition is carried out to gonnecting rod body, lid
Threedimensional model.
The present invention is used behind NURBS fitting surfaces, reconstruct cracking face, is conducted into CAD, is set up on the basis of cracking face
The threedimensional model of whole cracking connecting-rod is simultaneously used for the finite element moulds such as cracking connecting-rod intensity, analysis of Fatigue-life and Optimal Structure Designing
Intend calculating.
The above method specifically includes following steps：
A, take cracking face cloud data
Obtain exemplar
In reverse-engineering, the three-dimensional data for obtaining body surface is the crucial first step, the quality and essence of measurement data
Degree will directly affect the quality of later stage modeling.After con-rod fracture splitting processing, the qualified connecting rod exemplar of fracture quality is chosen, Fig. 2 is seen.
Obtain cloud data
In order to reach the precision to being broken faying face quantitative description, it is ensured that get high-quality cloud data.In view of
Connecting rod cracking face shape characteristic (size is smaller, is extremely complex space curved surface) and reconstruction accuracy requirement, it is public with Canadian NDI
3500 type PROCMM systems of department, data acquisition is carried out to the plane of disruption.Plane of disruption cloud data such as Fig. 3 after scanning.
B, optimization cloud data
Due to geometry topological sum optical block effect by ambient light, image processing algorithm and tested part itself etc. because
, there is random error unavoidably in the influence of element, produces noise point, acnode etc..These abnormity points will influence what follow-up composition surface reproduced
Really degree.Therefore, cloud data need to be optimized.It will deviate from the acnode of principal point cloud, the point beyond specified mobile limitation and overlapping
Point cloud is deleted, and noise point is reduced by compressive scans data band (upper and lower deviation).Point cloud after optimization is as shown in Figure 4.
C, encapsulation triangular mesh
Each point in point cloud is connected, triangular mesh encapsulation process is carried out to a cloud.As shown in figure 5, with triangular mesh
Form be paved with whole model surface.Repair triangulation network grid defect, fill up grid leak, and do not influence the feelings of curved surface details
Simplified under condition, relaxed, the operation such as fairing.
D, polygon stage
Cause triangular facet data volume larger and complicated because the data volume of scanning element cloud is excessive, be unfavorable for carrying out theory
Parametric modeling is, it is necessary into the polygon stage, carry out mesh generation to the plane of disruption by detecting curvature, do not influenceing curved surface thin
Relaxation patch in the case of section, removes and repairs intersecting area, be fitted contour line, construct polygon patch.
E, fitting nurbs surface
Construct after polygon patch, repair polygonal mesh defect, construct grid, surface parameterization is fitted to
Nurbs surface.NURBS adjusts the knot vector and weight factor of curved surface to control shape, root by four side field parameter fitting surfaces
According to parametric direction u and direction w, the knot vector created Surfaces is fitted to nurbs surface.The mathematical definition of nurbs surface is：
In formula：Ni,p(u), Nj,q(w) be respectively u to w to basic function；pi,jFor curved surface control vertex；Wi,jFor curved surface
Weight factor.Relation between curved surface and control point is as shown in Figure 6.Nurbs surface after fitting is as shown in fig. 7, i.e. cracking is combined
Face fitting is completed.Finally obtained nurbs surface can be exported as STEP files, and inputted in CAD system.
F, importing CAD modelings
The cracking face being fitted is imported into CAD, on this basis by sketch, stretching, Boolean calculation etc. set up gonnecting rod body,
The threedimensional model of connecting rod cap, and the complete cracking connecting-rod threedimensional model of assembling acquisition, such as Fig. 8 a- Fig. 8 c are carried out to gonnecting rod body, lid
It is shown.
Claims (4)
1. a kind of cracking connecting-rod modeling method based on plane of disruption three-dimensionalreconstruction, it is characterised in that comprise the following steps：
The qualified connecting rod exemplar of A, acquisition fracture quality, using high-precision optical system, obtains connecting rod cracking face cloud data；
B, pass through detection, remove acnode, overlapping point and noise point optimization cloud data；
C, a cloud is packaged triangular mesh processing, optimize triangle gridding quality；
D, into the polygon stage, by detecting curvature, relaxation border is fitted contour line, and constructing curve piece repairs polygon latticed
Lattice defect；
E, by surface parameterization, with NURBS fitting surfaces, obtain plane of disruption threedimensional model；
F, the plane of disruption importing CAD by reconstruct, on the basis of the plane of disruption, by sketch, stretching and Boolean calculation, obtain cracking and connect
The threedimensional model of the body of rod, connecting rod cap, and further set up the threedimensional model of cracking connecting-rod.
2. a kind of cracking connecting-rod modeling method based on plane of disruption three-dimensionalreconstruction according to claim 1, it is characterised in that：
Step A, the connecting rod exemplar is that the cloud data obtained is scanned using high speed optical tracker, special with cracking face pattern in reality
Levies in kind is now matched completely.
3. a kind of cracking connecting-rod modeling method based on plane of disruption three-dimensionalreconstruction according to claim 1, it is characterised in that
Step B is specially：Acnode, the point beyond specified mobile limitation and the overlapping cloud deletion of principal point cloud are will deviate from, passes through extruding
Scan data band reduces noise point.
4. a kind of cracking connecting-rod modeling method based on plane of disruption three-dimensionalreconstruction according to claim 1, it is characterised in that：
The step of step E, fitting surface with NURBS is：NURBS adjusts the knot vector and power of curved surface by four side field parameters
The factor controls shape, according to parametric direction u and direction w, the knot vector created Surfaces.
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| CN108080602A (en) * | 2017-12-21 | 2018-05-29 | 南京航空航天大学 | A kind of part blank nature cracking technology |
| CN108717725A (en) * | 2018-04-26 | 2018-10-30 | 东华大学 | A kind of spherical joints close-fitting vest undergarment covering the chest and abdomen prototype method based on virtual reality |
| CN109191447A (en) * | 2018-08-31 | 2019-01-11 | 宁波大学 | A kind of three-dimensional grid quality evaluating method based on geometric buckling analysis |
| CN109726477A (en) * | 2018-12-29 | 2019-05-07 | 华中科技大学 | A kind of gap revolute pair finite element modeling and analysis method |
| CN109816788A (en) * | 2019-01-17 | 2019-05-28 | 中国公路工程咨询集团有限公司 | A kind of three-dimensional geological object model method based on three-dimensional laser point cloud data |
| CN110335338A (en) * | 2019-04-30 | 2019-10-15 | 苏州科先包装机械有限公司 | The abnormal curved surface modeling method of hose circular arc sealing heating sheet |
| CN111739038A (en) * | 2020-08-05 | 2020-10-02 | 成都四方伟业软件股份有限公司 | Automatic connection method and device for hand-drawn graph contour line breakpoints |
| CN112304233A (en) * | 2020-11-04 | 2021-02-02 | 上海建工四建集团有限公司 | Deformation detection method for construction process of cantilever steel structural member |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107991711A (en) * | 2017-11-27 | 2018-05-04 | 吉林大学 | Aviation time domain electromagnetic three-dimensional bar random fracture band model is established and method of discrimination |
| CN108080602A (en) * | 2017-12-21 | 2018-05-29 | 南京航空航天大学 | A kind of part blank nature cracking technology |
| CN108717725A (en) * | 2018-04-26 | 2018-10-30 | 东华大学 | A kind of spherical joints close-fitting vest undergarment covering the chest and abdomen prototype method based on virtual reality |
| CN109191447B (en) * | 2018-08-31 | 2021-11-19 | 宁波大学 | Three-dimensional grid quality evaluation method based on geometric curvature analysis |
| CN109191447A (en) * | 2018-08-31 | 2019-01-11 | 宁波大学 | A kind of three-dimensional grid quality evaluating method based on geometric buckling analysis |
| CN109726477A (en) * | 2018-12-29 | 2019-05-07 | 华中科技大学 | A kind of gap revolute pair finite element modeling and analysis method |
| CN109816788A (en) * | 2019-01-17 | 2019-05-28 | 中国公路工程咨询集团有限公司 | A kind of three-dimensional geological object model method based on three-dimensional laser point cloud data |
| CN110335338A (en) * | 2019-04-30 | 2019-10-15 | 苏州科先包装机械有限公司 | The abnormal curved surface modeling method of hose circular arc sealing heating sheet |
| CN111739038A (en) * | 2020-08-05 | 2020-10-02 | 成都四方伟业软件股份有限公司 | Automatic connection method and device for hand-drawn graph contour line breakpoints |
| CN112304233A (en) * | 2020-11-04 | 2021-02-02 | 上海建工四建集团有限公司 | Deformation detection method for construction process of cantilever steel structural member |
| CN113626892A (en) * | 2021-07-31 | 2021-11-09 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Conformal curved surface radome high-precision three-dimensional model reconstruction method |
| CN113626892B (en) * | 2021-07-31 | 2023-02-28 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Conformal curved surface radome high-precision three-dimensional model reconstruction method |
| CN115908182A (en) * | 2022-11-25 | 2023-04-04 | 哈尔滨鑫润工业有限公司 | Mold abrasion repairing method based on digital model |
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Application publication date: 20171010 |