CN109872080B - Knowledge management method and system for aircraft assembly coordination rules - Google Patents
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Abstract
The invention discloses a method and a system for managing knowledge of an aircraft assembly coordination rule, which relate to the technical field of digital assembly, and the method comprises the following steps: firstly, a reasonable knowledge representation frame is constructed to explicitly express implicit assembly coordination knowledge, then a knowledge model is constructed to acquire knowledge, and finally an assembly coordination rule base is constructed to realize effective management of the assembly coordination rule, so that craftsmen can conveniently complete operations such as inputting, inquiring, deleting and reusing the assembly coordination rule. The system comprises three layers, namely a data layer, a logic layer and an application layer, wherein the data layer provides relevant data of the assembly coordination rule for the logic layer, the logic layer processes the rule data source and provides the rule data source for the application layer in different data views, and the application layer makes different application modes for different roles on the data formed by the logic layer, so that the assembly coordination design is assisted by process personnel.
Description
Technical Field
The invention relates to the technical field of digital assembly, in particular to an aircraft assembly coordination rule knowledge management method and system.
Background
Because of complex aircraft assembly, the aircraft assembly process is divided into two stages, wherein the first stage is the assembly coordination design (also called top-level process design), and finally the aircraft assembly coordination scheme is output. The second stage is the assembly process design (also called detailed process design/bottom process design), the assembly procedure and the process step design are carried out according to the result of the assembly coordination scheme, and finally the assembly process instruction is output. Therefore, the coordination design work of the aircraft assembly is an important link in the aircraft assembly process, and has important influence on the development of the design work of the subsequent assembly process and the aircraft assembly quality.
The current situation of the aircraft with respect to the assembly coordination design work is as follows:
(1) Coordination of aircraft assembly is a typically complex problem. The aircraft has the advantages of multiple structural parts, complex molded surfaces, multiple assembly stage divisions, and coordination requirements on pneumatic shapes, relative positions, butt joint separation surfaces and the like of the parts. And meanwhile, the selection of a processing method, measuring equipment and process equipment, various judgment and decision problems, and the tolerance distribution problems of each link of an error calculation and dimension chain are also considered.
(2) The solution of the assembly coordination problem is based on experience. Since related process theory is not yet mature, most decision-making problems have not yet established practical mathematical models and general algorithms, and the design and handling of interchange coordination problems is essentially solved with the experience knowledge that individuals have accumulated in a particular production environment.
(3) Aircraft assembly coordination knowledge is difficult to review and reuse. The aircraft assembly coordination knowledge is mainly empirical knowledge, and is difficult to describe by using symbol coding languages such as characters, formulas, pictures and the like, so that the aircraft assembly coordination knowledge cannot be digitally stored and organized and managed, and therefore, the aircraft assembly coordination knowledge is difficult to review and reuse by process staff.
(4) The requirements on aircraft assembly coordination design technicians are high. The coordination knowledge of aircraft assembly is mostly implicit knowledge, mainly experiences of technicians, and the main carrier is the technician with abundant experiences. When the ordinary craftsman performs the coordination design work of the aircraft assembly, the ordinary craftsman has no reference data due to lack of relevant working experience, and the ordinary craftsman cannot perform the coordination design work of the aircraft assembly. Therefore, only the craftsman with abundant aircraft assembly coordination work experience can be qualified when performing aircraft assembly coordination process design work.
Disclosure of Invention
The embodiment of the invention provides a method and a system for managing knowledge of aircraft assembly coordination rules, which can solve the problems in the prior art.
The invention provides an aircraft assembly coordination rule knowledge management method, which comprises the following steps:
a frame representation method is adopted to carry out structural representation on the knowledge of the assembly coordination rule;
classifying the assembly coordination rule knowledge according to the similarity, constructing a classification framework of an assembly coordination rule base, and defining classification attributes for each classification;
acquiring assembly coordination rule knowledge from an aircraft assembly coordination scheme and expert knowledge, taking classification attributes of the assembly coordination rule knowledge as a structure of a digital knowledge model, and constructing a plurality of digital knowledge models according to a knowledge framework of the assembly coordination rule, wherein each digital knowledge model is used for representing and storing one type of assembly coordination rule knowledge;
after the storage of the assembly coordination rule knowledge is completed, the assembly coordination rule knowledge is associated with the classification structure to form an assembly coordination rule knowledge instance, and then an assembly coordination rule base is formed.
The invention also provides an aircraft assembly coordination rule knowledge management system, which comprises a data layer, a logic layer and an application layer, wherein the data layer is used for providing data related to the assembly coordination rule knowledge to the logic layer; the logic layer is used for processing the assembly coordination rule knowledge and providing the assembly coordination rule knowledge to the application layer in different data views, and the application layer is used for making different application modes for different roles on the data formed by the logic layer, so as to assist process personnel in carrying out assembly coordination design;
the processing of the assembly coordination rule knowledge by the logic layer comprises the following steps:
a frame representation method is adopted to carry out structural representation on the knowledge of the assembly coordination rule;
classifying the assembly coordination rule knowledge according to the similarity, constructing a classification framework of an assembly coordination rule base, and defining classification attributes for each classification;
acquiring assembly coordination rule knowledge from an aircraft assembly coordination scheme and expert knowledge, taking classification attributes of the assembly coordination rule knowledge as a structure of a digital knowledge model, and constructing a plurality of digital knowledge models according to a knowledge framework of the assembly coordination rule, wherein each digital knowledge model is used for representing and storing one type of assembly coordination rule knowledge;
after the storage of the assembly coordination rule knowledge is completed, the assembly coordination rule knowledge is associated with the classification structure to form an assembly coordination rule knowledge instance, and then an assembly coordination rule base is formed.
The method and the system for managing the knowledge of the aircraft assembly coordination rule in the embodiment of the invention have the following advantages:
1. the aircraft assembly coordination rule representation framework is constructed, so that implicit assembly coordination knowledge can be expressed explicitly, and the aircraft assembly coordination rule representation framework can be checked, learned and used conveniently.
2. By constructing an assembly coordination rule classification structure and classification attribute definition, an assembly coordination rule base is formed, so that a craftsman can quickly inquire the required assembly coordination rule.
3. Through knowledge reuse, can assist technology personnel to carry out the coordination design work of assembly.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flowchart of an aircraft assembly coordination rule knowledge management method provided by an embodiment of the invention;
FIG. 2 is a classification structure of an assembly coordination rule base;
fig. 3 is a block diagram of an aircraft assembly coordination rule knowledge management system according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, the invention provides a method for managing aircraft assembly coordination rule knowledge, which comprises the steps of constructing a reasonable knowledge representation frame to explicitly express implicit assembly coordination knowledge, then constructing a classification frame and defining classification attributes to form an assembly coordination rule base. The specific method comprises the following steps:
1. assembly coordination rule knowledge representation
The assembly coordination rule is a typical result of an assembly coordination design meeting specific design requirements under certain process design conditions. A piece of assembly orchestration rule should include two parts of content: a brief description of the aircraft assembly coordination problem, which may also be referred to as a condition, is the basis for rule retrieval; the results of the aircraft assembly coordination design, which may also be referred to as conclusions, are what assists the craftsman in the assembly coordination design.
The assembly coordination rules are descriptions of assembly coordination problems and design results, are typical of factual knowledge, and have static properties. The assembly coordination rule is thus structured using a frame representation. The condition and conclusion part of the rule is split into a plurality of knowledge attributes as slots of the framework, including the condition attributes and conclusion attributes, so that the simple, clear and complete expression of the assembly coordination rule is realized, and the condition attributes are ensured to be screened to correspond to the unique assembly coordination rule.
Different types of rules, because of the nature of the solution problem, need to be described in different ways, and therefore their attribute set elements tend to be different. The same type of rule has the same attribute set, but different rules are formed due to different attribute values.
2. Assembly coordination rule knowledge classification and classification attribute definition
The method mainly uses the similarity among things and certain relations when classifying the assembly coordination rules based on the thought of a grouping technology, and the rules with high similarity are classified into the same class so as to be convenient for organization and management, and meanwhile, the unified model representation of the same class rules is also convenient.
In aircraft assembly coordination schemes, different chapters are often used to describe different assembly coordination issues. For different assembly coordination problems, the description of the coordination design content is often quite different; for the same assembly coordination problem, the sentence structure similarity of the coordination design content is high. Therefore, when classifying the assembly coordination rule, the classification structure is as shown in fig. 2 in a manner of classifying the assembly coordination problem.
And constructing a classification framework of the assembly coordination rule base according to the classification structure, and defining classification attributes for each classification, wherein the classification attributes are only used when a craftsman inquires the assembly coordination rule and can be the same as the condition attributes of the rule, so that the craftsman can conveniently and quickly inquire the corresponding rule.
3. Assembly coordination rule knowledge acquisition
The sources of assembly coordination rule knowledge are two: aircraft assembly coordination schemes and expert knowledge. The aircraft assembly coordination scheme is a resulting file of aircraft coordination process design, and is a summary and presentation of experience of process designers in terms of coordination design. The aircraft assembly coordination scheme is the basis of aircraft assembly coordination work, so that the description of coordination problems and the expression of coordination design results are relatively standard, the assembly coordination rules are easily extracted from the description and the dominance of the assembly coordination rules, and the method is a main source for acquiring the knowledge of the assembly coordination rules. In addition, the aircraft assembly coordination design is generally completed by process personnel working on process technology for many years and having abundant experience, and field experts for long-term coordination process design have abundant experience, so that the aircraft assembly coordination design has practical method strategies and unique insights for coordination design problems, and is a very important and precious knowledge source.
The current knowledge acquisition mode is mainly non-automatic knowledge acquisition, and knowledge input is mainly carried out manually according to a knowledge model. And constructing a digital knowledge model according to the knowledge framework of the assembly coordination rule, wherein one knowledge model is used for representing and storing one type of assembly coordination rule, and taking the attribute of the rule as the structure of the knowledge model, so that the rule is conveniently input and stored. According to the structure of the constructed knowledge model, the assembly coordination rule can be conveniently input by a craftsman and stored in a computer.
4. Assembly coordination rule classification warehouse-in
After the knowledge is input and stored in a computer, the assembly coordination rule knowledge object is associated with the classification structure to form an assembly coordination rule knowledge instance, and then an assembly coordination rule base is formed. In addition, the existing assembly coordination rules in the library can be pruned, so that the rules are conveniently organized and managed.
Examples
In this example, taking a knowledge management method of "positioning requirement rule" in an assembly coordination rule base as an example, the specific steps are as follows:
1. knowledge representation is carried out on the knowledge of the positioning requirement rule, the knowledge is divided into a plurality of combinations of attributes, and the attributes and the corresponding interpretations are as follows:
applicable model (conditions): (this fitting coordination knowledge applies to which model)
Section (condition) to which: (which section of the aircraft the positioning object belongs to)
Component name (condition): (which component the positioning object belongs to)
Positioning case (condition): (positioning in what circumstances)
Positioning object (condition): (which object is specifically located)
Orientation direction (condition): (in which direction to locate)
Positioning reference (conclusion): (based on which positioning is performed)
Positioning method (conclusion): (what method to use for positioning)
2. Establishing a digital knowledge model of the positioning requirement rule, acquiring the positioning requirement rule knowledge from an aircraft assembly coordination scheme and an industry expert according to the knowledge model, inputting and storing the knowledge into a computer, wherein the input result is as follows:
applicable model (conditions): passenger plane
Section (condition) to which: middle machine body
Component name (condition): top wall panel assembly
Positioning case (condition): when the top wall plate is assembled
Positioning object (condition): frame body
Orientation direction (condition): heading course
Positioning reference (conclusion): frame axis surface
Positioning method (conclusion): tool positioner
3. After the input is completed, the knowledge is associated with the classification structure, classification attributes are set, and unified management and query use of knowledge are facilitated.
Based on the same inventive concept, the invention also provides a knowledge management system of the aircraft assembly coordination rule, as shown in fig. 3, the implementation of the system can refer to the implementation of the method, and the repetition is omitted. The system comprises three layers, namely a data layer, a logic layer and an application layer, wherein the data layer provides relevant data of the assembly coordination rule for the logic layer. The logic layer processes the regular data sources and provides the processed regular data sources to the application layer in different data views. The application layer makes different application modes for different roles for the data formed by the logic layer, thereby assisting the process personnel in carrying out assembly coordination design. The processing of the assembly coordination rule knowledge by the logic layer comprises the following steps:
a frame representation method is adopted to carry out structural representation on the knowledge of the assembly coordination rule;
classifying the assembly coordination rule knowledge according to the similarity, constructing a classification framework of an assembly coordination rule base, and defining classification attributes for each classification;
acquiring assembly coordination rule knowledge from an aircraft assembly coordination scheme and expert knowledge, taking classification attributes of the assembly coordination rule knowledge as a structure of a digital knowledge model, and constructing a plurality of digital knowledge models according to a knowledge framework of the assembly coordination rule, wherein each digital knowledge model is used for representing and storing one type of assembly coordination rule knowledge;
after the storage of the assembly coordination rule knowledge is completed, the assembly coordination rule knowledge is associated with the classification structure to form an assembly coordination rule knowledge instance, and then an assembly coordination rule base is formed.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (2)
1. The aircraft assembly coordination rule knowledge management method is characterized by comprising the following steps of:
a frame representation method is adopted to carry out structural representation on the knowledge of the assembly coordination rule;
when the assembly coordination rules are classified, the similarity and certain relation are commonly existing among different things, and the rules with high similarity are divided into the same class so as to be convenient for organization and management, and meanwhile, the unified model representation is also convenient for the same class rules, a classification framework of an assembly coordination rule base is constructed, and classification attributes are defined for each classification;
acquiring assembly coordination rule knowledge from an aircraft assembly coordination scheme and expert knowledge, taking classification attributes of the assembly coordination rule knowledge as a structure of a digital knowledge model, and constructing a plurality of digital knowledge models according to a knowledge framework of the assembly coordination rule, wherein each digital knowledge model is used for representing and storing one type of assembly coordination rule knowledge;
after the storage of the assembly coordination rule knowledge is completed, the assembly coordination rule knowledge is associated with the classification structure to form an assembly coordination rule knowledge instance, and then an assembly coordination rule base is formed;
the assembly coordination rule is a typical result of an assembly coordination design meeting specific design requirements under certain process design conditions, and comprises two parts: a brief description of the aircraft assembly coordination problem, called a condition, which is the basis for rule retrieval; the result of the aircraft assembly coordination design, called conclusion, is the content of assisting the craftsman in the assembly coordination design;
the assembly coordination rule is a description of assembly coordination problems and design results, is typical of factual knowledge, has static properties, and adopts a frame representation method to carry out structural representation on the assembly coordination rule; dividing the condition and conclusion part of the rule into a plurality of knowledge attributes as slots of the framework, wherein the slots comprise the condition attributes and the conclusion attributes, so that the brief, clear and complete expression of the assembly coordination rule is realized, and the condition attributes are screened to correspond to the unique assembly coordination rule;
different types of rules, because of the nature of the solution problem, need to be described in different aspects, and therefore their attribute set elements tend to be different; the same type of rule has the same attribute set, but different rules are formed due to different attribute values.
2. An aircraft assembly coordination rule knowledge management system, which is characterized by comprising a data layer, a logic layer and an application layer, wherein the data layer is used for providing data related to the assembly coordination rule knowledge to the logic layer; the logic layer is used for processing the assembly coordination rule knowledge and providing the assembly coordination rule knowledge to the application layer in different data views, and the application layer is used for making different application modes for different roles on the data formed by the logic layer, so as to assist process personnel in carrying out assembly coordination design;
the processing of the assembly coordination rule knowledge by the logic layer comprises the following steps:
a frame representation method is adopted to carry out structural representation on the knowledge of the assembly coordination rule;
when the assembly coordination rules are classified, the similarity and certain relation are commonly existing among different things, and the rules with high similarity are divided into the same class so as to be convenient for organization and management, and meanwhile, the unified model representation is also convenient for the same class rules, a classification framework of an assembly coordination rule base is constructed, and classification attributes are defined for each classification;
acquiring assembly coordination rule knowledge from an aircraft assembly coordination scheme and expert knowledge, taking classification attributes of the assembly coordination rule knowledge as a structure of a digital knowledge model, and constructing a plurality of digital knowledge models according to a knowledge framework of the assembly coordination rule, wherein each digital knowledge model is used for representing and storing one type of assembly coordination rule knowledge;
after the storage of the assembly coordination rule knowledge is completed, the assembly coordination rule knowledge is associated with the classification structure to form an assembly coordination rule knowledge instance, and then an assembly coordination rule base is formed;
the assembly coordination rule is a typical result of an assembly coordination design meeting specific design requirements under certain process design conditions, and comprises two parts: a brief description of the aircraft assembly coordination problem, called a condition, which is the basis for rule retrieval; the result of the aircraft assembly coordination design, called conclusion, is the content of assisting the craftsman in the assembly coordination design;
the assembly coordination rule is a description of assembly coordination problems and design results, is typical of factual knowledge, has static properties, and adopts a frame representation method to carry out structural representation on the assembly coordination rule; dividing the condition and conclusion part of the rule into a plurality of knowledge attributes as slots of the framework, wherein the slots comprise the condition attributes and the conclusion attributes, so that the brief, clear and complete expression of the assembly coordination rule is realized, and the condition attributes are screened to correspond to the unique assembly coordination rule;
different types of rules, because of the nature of the solution problem, need to be described in different aspects, and therefore their attribute set elements tend to be different; the same type of rule has the same attribute set, but different rules are formed due to different attribute values.
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| CN108564304A (en) * | 2018-05-04 | 2018-09-21 | 西北工业大学 | A kind of operation characterising parameter generation method towards aircraft assembly |
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| CN105354375A (en) * | 2015-10-27 | 2016-02-24 | 利诚服装集团股份有限公司 | Design method of expert knowledge base oriented to intelligent garment manufacturing |
| CN108564304A (en) * | 2018-05-04 | 2018-09-21 | 西北工业大学 | A kind of operation characterising parameter generation method towards aircraft assembly |
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| "融合规则的典型工艺表示与工艺决策方法研究";黄利江等;《西北工业大 学学报》;20091031;第583-588页 * |
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