CN113591232A - Product information modeling method based on interactive feature couple - Google Patents
Product information modeling method based on interactive feature couple Download PDFInfo
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Abstract
The invention provides a product information modeling method based on an interactive feature couple, which comprises the following steps: constructing a product information model framework based on the interactive feature couple, wherein the product information model framework comprises the steps of constructing the attribute of the interactive feature couple and determining the organization relationship among information; the organization relation of the interactive characteristic even information, the part information and the assembly body information; and when the part is modeled, assigning values to part of attributes of the interactive feature pairs, instantiating each interactive feature pair and associating the interactive feature pairs. According to the invention, by constructing a product information model framework based on the interactive feature couple, the interactive feature couple is instantiated according to the interactive information in the part modeling stage, part attributes of the interactive feature couple are assigned, the interactive feature couple is taken as a carrier, and the product design intention is associated to the part model, so that the product design intention can be uniformly transmitted to the assembly modeling stage from the part modeling stage, and the defect of the product design intention in the assembly modeling stage is made up.
Description
Technical Field
The invention belongs to the field of computer aided design, and particularly relates to a product information modeling method based on an interactive feature pair.
Background
With the rapid development of digital manufacturing technology and information technology, a product information model with a uniform process plays an increasingly critical role in the field of Computer Aided Design (CAD), and the quality and efficiency of product modeling are influenced. The method is based on a model definition (MBD) technology, adopts an integrated three-dimensional solid model to completely express the information of product definition, and takes the information as a core, so that the information becomes a unique basis for design, manufacture and management, the uniformity of data information from upstream to downstream of digital design and manufacture is realized, and the efficiency of product design and manufacturing process planning is improved. However, the MBD technology is widely applied only in the field of part modeling and the field of assembly process planning, and the development in the field of assembly modeling is not mature enough. The assembly modeling is that discrete CAD entity parts are constructed into a digitalized assembly model which can be identified by a computer through the matching constraint between part models, and the assembly modeling has important significance for guiding the production and assembly operation of actual products and improving the manufacturing efficiency of the products. Due to the lack of design intents available for assembly modeling, the design intents store information on how parts are matched, so that the intelligence degree of the assembly modeling is low, and the design intents are specifically represented as follows: the assembly modeling stage is full of manual operations such as a large number of mouse picking matching surface operations, keyboard inputting matching information operations, repeated view rotating zooming and the like. Actually, the operation is to secondarily express the information which is already expressed in the part modeling stage in the assembly modeling stage, so that the improvement of the product modeling efficiency is severely restricted.
In view of the above problems, the document "assembly constraint modeling based on mating surface couple" (yi guo, tan zhang, zhang tree, etc.. the university of zhejiang schoolwork (engineering edition), 2006(06):921 and 926) proposes a method for dynamically establishing assembly constraint by identifying the mating surface couple on the part model in the assembly modeling stage, but the information model established by the method is only directed at the assembly modeling stage, and cannot cover the whole life cycle from product design to manufacturing.
Unlike the mating surface couple, which cannot cover the product design and Manufacturing full life cycle, the present team proposed an interaction feature in the earlier document Framework for the integration of assembly modeling and simulation based on assembly development pair (Zhang J., Xu, Z., Li, Y., et al. the International Journal of Advanced Manufacturing Technology,2015,78(5/8):765 780) and the document Automatic assembly of product in virtual environment based on interaction development pair (Zhang, J., Wang, P., Li, Y., et al. Journal of Intelligent Manufacturing 2018, 6 (1235): 1256) pair of IFP 1256, and the method for product modeling, sequence planning, path planning, simulation and the like based on the interactive feature pair is provided, the interactive feature pair is used as a carrier of a design intention and is consistently transmitted from the upstream of product design to the downstream of product manufacture, and the MBD idea is supported to be fully covered. However, these works do not form a systematic framework for product information modeling, resulting in the idea of MBD not being systematically implemented in the field of assembly modeling.
Disclosure of Invention
Aiming at the problems that the MBD thought cannot be systematically realized in the assembly modeling field, so that the assembly modeling efficiency and the intelligence degree are low and the like, the invention provides a product information modeling method based on an interactive feature pair, which is used for making up the deficiency of the assembly modeling design intention, realizing the uniform transmission of the design intention from the part modeling stage to the assembly modeling stage and enabling the MBD thought to be systematically realized in the assembly modeling field.
In order to achieve the purpose of the invention, the invention provides a product information modeling method based on an interactive feature couple, which comprises the following steps:
constructing a product information model framework based on the interactive feature couple, wherein the product information model framework comprises the steps of constructing the attribute of the interactive feature couple and determining the organization relationship among information;
the method comprises the following steps of (1) organizing the information of an interactive feature couple, the information of parts and the information of an assembly body, wherein the attributes comprise the basic type, the interactive feature, the interactive type and the interactive parameters of the interactive feature couple;
and when the part is modeled, assigning values to part of attributes of the interactive feature pairs, instantiating each interactive feature pair and associating the interactive feature pairs.
According to the further improvement of the scheme, an IntFeatPair class is constructed to support the construction of the product information model framework based on the interactive feature pair.
According to the further improvement of the scheme of the invention, the organization relationship between the information comprises the relationship between the interactive characteristic pair information and the part information and the organization relationship between the interactive characteristic pair information and the assembly body information.
In a further refinement of the solution according to the invention, the part information comprises geometric information and a design intent, which is stored in the part model in the form of an interactive feature pair.
The geometric information describes the geometric shape and size of the part entity, and the information is uniformly organized in a geometric entity set and comprises the construction processes of the part entity, such as stretching, cutting and rotating;
design intent refers to information about how parts fit together, captured by an interaction feature couple during the part modeling phase, that is uniformly organized in an interaction feature couple set, including all interaction feature couples with which the part is associated. The two types of information are in parallel relation and are both attributes of the part information.
In the organization relationship, the interactive characteristic even information is the attribute of the design intention, the geometric information and the design intention are parallel, and the geometric information and the design intention are both subordinate to the attribute of the part.
In addition, the invention further improves the scheme, and the attributes comprise the basic type of the interactive feature couple, the interactive feature, the interactive type and the interactive parameter.
1) Basic types of interaction feature pairs: the interactive features have six basic types, which are respectively: the point-point interaction feature pair, the point-edge interaction feature pair, the point-surface interaction feature pair, the edge-edge interaction feature pair, the edge-surface interaction feature pair and the surface-surface interaction feature pair.
2) Interactive characteristics of the interactive characteristics couple: the interactive feature pair comprises two interactive features, which can be respectively defined as a first interactive feature 1 and a second interactive feature 2, whose topological form corresponds to the basic type of the interactive feature pair. During part modeling, only one interactive feature in each interactive feature pair is associated with the actual feature of the part, and the other interactive feature remains virtual.
3) Interaction type of the interaction feature couple: the interaction type of the interaction feature pair determines the pose relationship between the pair of interaction features, including fixed constraints, concentric constraints, distance constraints, alignment constraints, and angle constraints.
4) Interaction parameters of the interaction feature pairs: the interaction parameters of the interaction feature pairs determine the quantitative relationship of the poses between a pair of interaction features, for example, for distance constraint, the interaction parameters determine the distance between the pair of interaction features.
In a further improvement of the solution of the present invention, said assigning values to part of attributes of the interactive feature pairs during part modeling, so as to instantiate each interactive feature pair and associate the interactive feature pairs, comprises:
step 2.1: determining a set of parts P { P1,p2,…,pnWhere n is the number of parts; and a part piSet of interaction features F { F }1,f2,…,fmWhere m is the part piThe number of interactive features of (a);
step 2.2: taking i as 1;
step 2.3: for part piTaking j as 1;
step 2.4: for feature fjCreating an interactive aspect object according to fjAnd fjThe topological form of the interactive features assigns values to the basic type attributes of the interactive feature pairs;
step 2.5: only one interactive feature of the interactive feature pair is associated with the actual feature, the other one remains virtual, e.g. the first interactive feature 1 in the interactive feature pair object created in step 2.4 is designated as fjWhile the second interactive feature 2 remains virtual, i.e. an interactive feature even object, the first interactive feature 1 ═ fjInteractive characterSecond interaction feature
Step 2.6: according to fjAssigning a value to the interaction type attribute of the interaction feature even object created in step 2.4;
step 2.7: according to fjAssigning values to the interaction parameter attributes of the interaction feature even object created in step 2.4;
step 2.8: j is j +1, if j is less than or equal to m, repeating the step 2.4 to the step 2.7 to complete the association of the remaining interactive feature pairs, otherwise, entering the step 2.9;
step 2.9: and if i is not more than n, repeating the steps from 2.3 to 2.8 to complete the interactive feature pair association of all the parts, and otherwise, ending the interactive feature pair association operation.
After all parts are associated with the interactive feature pairs, the design intention is stored in the part model in the form of the interactive feature pairs and is transmitted to an assembly modeling stage; and in the assembly modeling stage, the interactive feature pairs can be identified and matched, the assembly of the actual features of the parts is guided according to the design intention expressed by the matched interactive feature pairs, the manual operation of assembly modeling is reduced, and the MBD idea is systematically realized in the assembly modeling stage.
Compared with the prior art, the invention can realize the following beneficial effects:
the product information modeling method provided by the invention comprises the steps of firstly constructing a product information model framework based on an interactive feature couple, wherein the product information model framework comprises the steps of constructing the attribute of the interactive feature couple and determining the organization relation between the information of the interactive feature couple and part information and assembly body information; and then in the part modeling stage, the interactive feature pairs are instantiated according to the interactive information, the values are assigned to partial attributes of the interactive feature pairs, the interactive feature pairs are used as carriers, the product design intentions are related to the part models, so that the product design intentions can be uniformly transmitted to the assembly modeling stage from the part modeling stage, the loss of the product design intentions in the assembly modeling stage is made up, the MBD supporting idea can be systematically realized in the assembly modeling field, and even can be covered in the downstream stages of sequence, process planning and the like.
Drawings
FIG. 1 is a flow chart of the information modeling of the present invention;
FIG. 2 is a schematic view of a product information model of the present invention, including a part information model and an assembly information model;
FIG. 3 is a UML class diagram of the present invention supporting the implementation of a product information model;
FIG. 4 is a flow chart of the part modeling phase correlation interaction feature couple of the present invention;
FIG. 5 is a schematic structural view of a bolt and nut of an embodiment of the present invention;
FIG. 6 is a schematic view of the structure of the shaft and key in the embodiment of the present invention
FIG. 7 is a schematic view of a part construction tree of a bolt in an embodiment of the present invention;
FIG. 8 is a schematic drawing of a part construction tree of a nut in an embodiment of the invention;
FIG. 9 is a schematic view of a part construction tree of a shaft in an embodiment of the present invention;
FIG. 10 is a schematic view of a part construction tree of a key in an embodiment of the present invention;
FIG. 11 is a schematic view of an assembled construction tree of a bolt and a nut in an embodiment of the present invention;
FIG. 12 is a tree diagram illustrating the assembled construction of the shaft and key in an embodiment of the present invention.
Wherein:
1. bolt 2, nut 3, actual interaction characteristic f of boltb1
4. Actual interaction characteristic f of bolt b25. Actual interaction characteristic f of nut n16. Actual interaction characteristic f of nutn2
7. Axis 8, key 9, actual interaction feature of axis fs1
10. Actual interaction characteristic f of the shaft s211. Actual interaction characteristic f of the shaft s312. Actual interaction characteristics f of keysk1
13. Actual interaction characteristics f of keys k214. Actual interaction characteristics f of keysk3。
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.
Referring to fig. 1, the present invention provides a product information modeling method based on an interactive feature pair, which includes the following steps:
step 1: and constructing a product information model framework based on the interactive feature couple, wherein the construction of the attributes of the interactive feature couple is included, and the organization relation among the information is determined.
In assembly modeling, fit constraints between parts are achieved by specifying fit interactions (e.g., fit, concentricity, etc.) between mating features (e.g., planes, cylinders, centers, etc.) associated with Interactive Features (IFs). By Interactive Features (IF) is meant areas (e.g. points, lines, faces) of the parts that are of significance to the assembly, when a pair of parts are mated, a pair of interactive features that interact form an interactive feature couple. For example, a pair of planar features in contact with each other on two plates with applied conformable constraints constitutes an inter-feature couple.
Step 1.1: and constructing the attribute of the interactive feature couple. The attributes comprise basic types, interactive characteristics, interactive types and interactive parameters of the interactive characteristic pairs.
1) Basic types of interaction feature pairs: the interactive features have six basic types, which are respectively: the point-point interaction feature pair, the point-edge interaction feature pair, the point-surface interaction feature pair, the edge-edge interaction feature pair, the edge-surface interaction feature pair and the surface-surface interaction feature pair.
2) Interactive characteristics of the interactive characteristics couple: the interactive feature pair comprises two interactive features, which can be respectively defined as a first interactive feature 1 and a second interactive feature 2, whose topological form corresponds to the basic type of the interactive feature pair. During part modeling, only one interactive feature in each interactive feature pair is associated with the actual feature of the part, and the other interactive feature remains virtual.
3) Interaction type of the interaction feature couple: the interaction type of the interaction feature pair determines the pose relationship between the pair of interaction features, including fixed constraints, concentric constraints, distance constraints, alignment constraints, and angle constraints.
4) Interaction parameters of the interaction feature pairs: the interaction parameters of the interaction feature pairs determine the quantitative relationship of the poses between a pair of interaction features, for example, for distance constraint, the interaction parameters determine the distance between the pair of interaction features.
Step 1.2: and determining the organization relation of the interactive feature even information, the part information and the assembly body information.
In one embodiment of the invention, the part information is divided into two categories, including geometric information and design intent.
The geometric information describes the geometric shape and size of the part entity, and the information is uniformly organized in a geometric entity set and comprises the construction processes of the part entity, such as stretching, cutting and rotating;
design intent refers to information captured by the interaction feature couple during the part modeling phase regarding how parts fit together, which information is uniformly organized in an interaction feature couple set, including all interaction feature couple information associated with the part. The two types of information are in parallel relation and are both attributes of the part information.
The assembly information of the invention is similar to that of the mainstream modeling method, and comprises part information and assembly constraint information, and the difference is that the part information in the assembly comprises interactive characteristic even information.
Step 2: when a part is modeled, part of attributes of an interactive feature couple are assigned, an actual interactive feature object is created, each interactive feature couple is instantiated, the interactive feature couple is associated in the part modeling stage, the interactive feature couple is used as a carrier to capture a design intention and is transmitted to downstream stages such as assembly modeling, and the system implementation of the MBD idea in the assembly modeling stage is supported.
In one embodiment of the present invention, the steps are specifically as follows:
step 2.1: determining a set of parts P { P1,p2,…,pnWhere n is the number of parts; and a part piSet of interaction features F { F }1,f2,…,fmWhere m is the part piThe number of interactive features of (a);
step 2.2: taking i as 1;
step 2.3: for part piTaking j as 1;
step 2.4: for feature fjCreating an interactive aspect object according to fjAnd fjThe topological form of the interactive features assigns values to the basic type attributes of the interactive feature pairs;
step 2.5: only one interactive feature of the interactive feature pair is associated with the actual feature, the other one remains virtual, e.g. the first interactive feature 1 in the interactive feature pair object created in step 2.4 is designated as fjWhile the second interactive feature 2 remains virtual, i.e. an interactive feature even object, the first interactive feature 1 ═ fjInteractive feature even object, second interactive feature
Step 2.6: according to fjAssigning a value to the interaction type attribute of the interaction feature even object created in step 2.4;
step 2.7: according to fjAssigning values to the interaction parameter attributes of the interaction feature even object created in step 2.4;
step 2.8: j is j +1, if j is less than or equal to m, repeating the step 2.4 to the step 2.7 to complete the association of the remaining interactive feature pairs, otherwise, entering the step 2.9;
step 2.9: and if i is not more than n, repeating the steps from 2.3 to 2.8 to complete the interactive feature pair association of all the parts, and otherwise, ending the interactive feature pair association operation.
In one embodiment of the invention, the embodiment constructs an IntFeatPair class to support the construction of a product information model framework based on an interactive feature pair, and instantiates the design intention expressed by the interactive feature pair in a part model; additionally, relationships between the IntFeatPair class and classes associated with part information and assembly information are also determined.
1. Referring to fig. 1, the IntFeatPair class is constructed by the following steps:
construct attributes of the IntFeatPair class:
1) basic types of IntFeatPair class: constructing a basic Type attribute Type of the IntFeatPair class for storing basic Type information of an interactive feature pair, wherein the Type comprises IFPVV、IFPVE、IFPVF、IFPEE、IFPEF、IFPFFRespectively representing a point interactive feature pair, a point edge interactive feature pair, a point surface interactive feature pair, an edge interactive feature pair, an edge surface interactive feature pair and a surface interactive feature pair;
2) interactive features of the IntFeatPair class: constructing interactive feature attributes IF1 and IF2 of an IntFeatPair class, and respectively storing first interactive feature 1 information and second interactive feature 2 information of an interactive feature pair;
3) interaction type of IntFeatPair class: constructing an interactive type attribute Constraint of an IntFeatPair class, wherein the interactive type attribute Constraint is used for storing assembly Constraint type information in a CAD system, such as Fix, Coincident, Distance, Align and Angle, and respectively represents fixed Constraint, concentric Constraint, Distance Constraint, alignment Constraint and Angle Constraint;
4) interaction parameters for the IntFeatPair class: and constructing an interaction parameter attribute Value of the IntFeatPair class, and storing the interaction parameter information of the interaction feature pair.
2. The specific steps for determining the relationship between the IntFeatPair class and the related classes of the part information and the assembly information are as follows:
1) in this embodiment, referring to fig. 3, the part model is represented by Component class; the geometric information is uniformly organized in a geometric entity set and is represented by a Body class; the design intent is uniformly organized in an interactive feature idol set, represented by the intfeatpoargroup class. The Body class and the IntFeatPairgroup class are parallel and are the attributes of the Component class; the IntFeatPairgroup uniformly manages all interactive characteristic pair objects related to the part, so that the IntFeatPair class is the attribute of the IntFeatPairgroup class;
2) the assembly model is represented by a Product type, the assembly constraint information is represented by a constraintGroup type, both the Component type and the constraintGroup type are attributes of the Product type, and the Component information comprises interactive characteristic even information IntFeatPair.
In one embodiment of the invention, the interaction of a bolt and a nut is adopted, and the specific steps of associating the interaction feature pairs in the part modeling stage are shown as follows:
1. determining a part set P { bolt P1Nut p2The number of parts n is 2; for part p1Bolt, its set of interaction features F1{ threaded cylindrical surface fb1Bottom plane f of bolt headb2}，m 12; for part p2Nut, set of interaction characteristics F2{ threaded cylindrical surface fn1Top plane f of nutn2}，m2＝2。
2. Constructing a solid model of a bolt and a nut in a part modeling environment;
3. taking i as 1;
4. for piTaking j as 1;
5. creating interactive feature doublet IFP1, according to piF of (a)jAnd fjThe topological form of the interactive feature assigns a value to the basic Type attribute Type of the interactive feature couple, here, the face-to-face interactive feature couple IFPFFI.e. IFP1.type ═ IFPFF；
6. The interactive feature IF of IFP1 is specified. Interactive features even only one interactive feature is associated with the actual feature, while the other remains virtual, defining a first interactive feature 1IF1 ═ fjHere ifp1.if1 ═ fb1，
7. According to fjThe actual Constraint type of IFP1 is assigned a value, here, a coaxial Constraint, i.e., IFP1.Constraint is Coincident;
8. according to fjThe Value of the interaction parameter attribute Value of the IFP1 is assigned, where the interaction parameter is zero, that is, IFP1.Value is 0;
j ═ j +1, and steps 5 to 8 are repeated until part piAll interactive features are associated with an interactive feature pair. For feature fb2Creating p1The interactive feature doublet IFP2, wherein Type IFPFF，IF1＝fb2，
Constriant＝Distance，Value＝0；
In one embodiment of the present invention, the example adopts the interaction of the axis and the key, and shows the specific steps of associating the interaction feature couple in the part modeling stage:
1. determining a set of parts P { axis P1Bond p2The number of parts n is 2; for part p1Axis, set of interaction features F1{ bottom plane of key groove fs1Side plane f of key grooves2End surface f of shafts3}，m 13; for part p2Key, its set of interaction features F2{ key bottom plane fk1Key side plane fk2Key end face fk3}，m2＝3。
2. Constructing a solid model of the shaft and the key in a part modeling environment;
3. taking i as 1;
4. for piTaking j as 1;
5. creating interactive feature doublet IFP1, according to piF of (a)jAnd fjThe topological form of the interactive feature assigns a value to the basic Type attribute Type of the interactive feature couple, here, the face-to-face interactive feature couple IFPFFI.e. IFP1.type ═ IFPFF；
6. Specifying interactive features of IFP1, only one interactive feature of an interactive feature pair being associated with an actual feature, while the other interactive feature remains virtual, i.e. interactive feature 1IF1 ═ fjHere ifp1.if1 ═ fs1，
7. According to fjThe actual Constraint type of IFP1 is assigned a value, here, a Distance Constraint, i.e., IFP1.Constraint is Distance;
8. according to fjThe Value of the interaction parameter attribute Value of the IFP1 is assigned, where the interaction parameter is zero, that is, IFP1.Value is 0;
j ═ j +1, and steps 5 to 8 are repeated until part piAll interactive features of (2) are associated with an interactive feature pair. For feature fs2And fs3Creating p1The IFP2 and IFP3, wherein IFP2{ Type ═ IFPFF，IF1＝fs2，
Constraint＝Distance，Value＝0}，IFP3{Type＝IFPFF，IF1＝fs3，
Constraint＝Align，Value＝0}
After all parts are associated with the interactive feature pairs, the design intention is stored in the part model in the form of the interactive feature pairs and can be transmitted to an assembly modeling stage subsequently; and in the assembly modeling stage, the interactive feature pairs can be identified and matched, the assembly of the actual features of the parts is guided according to the design intention expressed by the matched interactive feature pairs, the manual operation of assembly modeling is reduced, and the MBD idea is systematically realized in the assembly modeling stage.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A product information modeling method based on an interactive feature couple is characterized by comprising the following steps:
constructing a product information model framework based on the interactive feature couple, wherein the product information model framework comprises the steps of constructing the attribute of the interactive feature couple and determining the organization relationship among information;
the organization relation of the interactive characteristic even information, the part information and the assembly body information;
and when the part is modeled, assigning values to the attributes of the interactive feature pairs, instantiating each interactive feature pair and associating the interactive feature pairs.
2. The method of claim 1, wherein an IntFeatPair class is constructed to support construction of the interactive feature couple-based product information model framework.
3. The method of claim 1, wherein the organization relationship between the information includes a relationship between the information of the interactive feature couple and the information of the part, and a relationship between the information of the interactive feature couple and the information of the assembly body.
4. The method of claim 3, wherein the part information comprises geometric information and design intent, and the design intent is stored in the part model in the form of an interactive feature couple.
5. The method of claim 4, wherein in the organizational relationship, the interactive feature pair information is an attribute of a design intention, the geometric information and the design intention are juxtaposed, and both the geometric information and the design intention belong to an attribute of the part.
6. The method of claim 1, wherein the attributes comprise basic type of interaction feature couple, interaction feature, interaction type and interaction parameter.
7. The method of claim 6, wherein the basic types of the interactive feature couple include a point-point interactive feature couple, a point-edge interactive feature couple, a point-surface interactive feature couple, an edge-edge interactive feature couple, an edge-surface interactive feature couple, and a surface-surface interactive feature couple.
8. The method of claim 6, wherein the interaction type corresponds to an assembly constraint type of a CAD system.
9. The method of claim 6, wherein the interaction types include fixed constraints, concentric constraints, distance constraints, alignment constraints, and angle constraints.
10. The method for modeling product information based on interaction feature pairs according to any one of claims 1-9, wherein assigning values to attributes of interaction feature pairs to instantiate each interaction feature pair and associate interaction feature pairs during part modeling comprises:
s2.1, determining a part set P { P1,p2,…,pnWhere n is the number of parts; and a part piSet of interaction features F { F }1,f2,…,fmWhere m is the part piThe number of interactive features of (a);
s2.2, taking i as 1;
s2.3 for part piTaking j as 1;
s2.4, for feature fjEstablishing an interactive feature even object according to fjAnd fjThe topological form of the interactive features assigns values to the basic type attributes of the interactive feature pairs;
s2.5, only the interactive feature pairOne interactive feature is associated with the actual feature and the other remains virtual, so the first interactive feature in the interactive feature couple object created in step 2.4 is designated as fjAnd the second interactive feature remains virtual, i.e. an interactive feature doubletjSecond interactive characteristic ═ second interactive characteristic
；
S2.6 according to fjAssigning a value to the interaction type attribute of the interaction feature even object created in step S2.4;
s2.7, according to fjAssigning values to the interaction parameter attributes of the interaction feature even object created in step S2.4;
s2.8, if j is equal to or less than j +1, repeating step S2.4 to step S2.7 to complete the association of the remaining interactive feature pairs, otherwise, entering step 9;
and S2.9, i is i +1, if i is not more than n, repeating the step S2.3 to the step S2.8 to complete the interactive feature pair association of all the parts, and otherwise, ending the interactive feature pair association operation.
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| ZHIJIA XU ET AL: "Product modeling framework based on interaction feature pair", 《COMPUTER-AIDED DESIGN》, vol. 45, no. 12, pages 1591 - 1602 * |
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