A method and device for constructing landing gear metamodel based on metamodeling

Abstract

The present invention discloses a method and device for constructing a metamodel of a landing gear based on metamodeling, the method comprising: splitting the aircraft landing gear according to five dimensions, namely, physical components, interfaces, technical indicators, processes involved in the development of the aircraft landing gear engineering, and technical fields involved in each component, to construct a metamodel instance of the aircraft landing gear; establishing constraint relationships based on the structural, electromechanical, and thermal properties of the aircraft landing gear, attaching the constraint relationships to the metamodel instances of each aircraft landing gear through modeling expressions, encapsulating the metamodel instances of the aircraft landing gear to which the constraint conditions are attached; determining the association relationship between the metamodel instances of the aircraft landing gear after encapsulation; constructing an aircraft landing gear model, and assigning values ​​to each instance in the aircraft landing gear model. The method constructs a metamodel instance suitable for the aircraft landing gear in view of the characteristics of the aircraft landing gear system, saving the overall architecture design time of the landing gear.

Description

Technical Field

[0001] The present invention relates to the field of aircraft landing gear engineering, and in particular to a method and device for constructing a landing gear metamodel based on metamodeling. Background Art

[0002] The landing gear is a key device used to realize the parking, take-off, landing and directional control of the aircraft, and to absorb the impact energy of the aircraft landing and taxiing. Its overall design process involves load, hydraulic, pneumatic, control, structure, electrical and other disciplines, and is a typical electromechanical and hydraulic coupling system. With the gradual evolution of the landing gear product spectrum, the continuous application of new technologies, new processes and new materials, new products and new functions of the landing gear continue to emerge, and the traditional landing gear design model based on structural design has gradually become difficult to achieve digital innovation design of the landing gear. At present, Model-based Systems Engineering (MBSE) has gradually become widely used in the digital innovation design process of landing gear, supporting the design, analysis and verification of complex product development throughout the life cycle through models.

[0003] In the design process of landing gear model based on MBSE, metamodel is the basis for realizing complex system modeling. Metamodel is usually a set of graphics or symbols with syntax and semantics, which defines the elements and relationships between elements that make up the model. It can be used as an "abstract language" to describe the model and provide effective support for the parsing and processing of the model. The icons formed by the combination of metamodels are called models. Taking the composition structure of the landing gear as an example, the main landing gear may include main struts, wheels and brakes, among which the wheels may be divided into left front wheels, left rear wheels, etc. according to different positions. At this time, dragging some icons in some specific modeling software tools and assigning them attributes to draw and describe the composition relationship of the landing gear is called modeling. The icons with specific attributes (such as left front wheels and left rear wheels) are called models, and the general icons (such as wheels) dragged are called metamodels. The software that generates the above model drawings is called modeling tools.

[0004] In the process of implementing MBSE in the engineering field, it is found that it is difficult for engineers to model the functions, interfaces and other elements of the landing gear application object through modeling tools. The fundamental reason is that the existing mainstream MBSE modeling tools mainly use a single type of generalized icons to realize the modeling of the landing gear system, and the icons used are too abstract and not close to the engineers' understanding of the landing gear. For example, the Cameo System Modeler modeling tool of Dassault Company in France uses SysML plug-ins to realize partial view modeling of landing gear requirements, functions, interfaces, and parameters, but when considering other views such as reliability and safety analysis, the constructed landing gear model needs to be expanded through design profiles and secondary development, and the scalability is poor. In addition, the Enterprise Architect (EA) modeling tool provided by Spark System Company in Australia can also design landing gear through modeling languages ​​such as SysML or UML, but its meta-model (such as modules, actions, etc.) is relatively fixed and abstract, which is difficult for engineers to understand and modify.

[0005] By analyzing the landing gear modeling functions of the above two typical MBSE modeling tools, we can find the problems that need to be solved in the current technology:

[0006] (1) Some tools only support a single metamodel type and do not support unified modeling in multiple fields.

[0007] Most MBSE modeling tools are developed based on the SysML (System Modeling Language) modeling specification. SysML is a well-known system-level product modeling specification and de facto standard in the MBSE field, and is extremely outstanding in terms of system expression ability and coverage. However, in the engineering design practice of the landing gear system, design data may often be expressed through domain-specific modeling languages ​​(Domain Specified Modeling Language, DSML) such as UML (software design field) and AADL (embedded system design field). These domain-specific modeling languages ​​provide semantics to support the development of their respective fields, which are easier for engineers to accept and learn. Obviously, the metamodel semantics of SysML are not enough to cover the modeling languages ​​involved in the above-mentioned landing gear modeling process. Therefore, it is necessary to explore a set of metamodels that are compatible with the semantics of heterogeneous modeling languages ​​to support the description of multi-domain model data in the entire life cycle of the landing gear system development.

[0008] (2) Metamodel expansion is difficult, which is not conducive to the full life cycle changes of the model

[0009] Taking the SysML modeling language in the Cameo System Modeler modeling tool as an example, although the modeling tool also provides a custom metamodel extension mechanism based on Profile, the main framework still needs to be extended on the existing framework of a specific language. For example, the nine basic diagram types of the SysML modeling language, such as the requirement diagram and the model definition diagram, cannot cover the customized modeling of multidisciplinary knowledge such as structure, electromechanical, and thermal in the landing gear design process, and have certain limitations. Therefore, in the process of landing gear system modeling, a landing gear metamodel construction method that is expandable and supports customization is needed.

[0010] (3) The underlying semantics of existing modeling languages ​​are not unified, resulting in ambiguity

[0011] Taking the SysML modeling language in the Cameo System Modeler modeling tool as an example, the semantics used in its activity diagram metamodel are mostly inherited from the activity diagram semantics in UML. Although the graphical representation meets the compliance requirements of the SysML modeling language, the underlying semantics are easily confused. For example, the element "module" is represented in the XML of the underlying software as <sysml:block>< / sysml:block> However, in EA modeling tools, the underlying data semantics of the "action" elements in the activity diagram are different from those in Cameo System Modeler, which can easily cause ambiguity during software integration and lead to additional integration costs. Therefore, in the process of landing gear system modeling, a landing gear underlying modeling language with unified underlying semantics is needed.

[0012] The GOPPRR-E (Graph, Object, Property, Point, Relationship, Role, Extension) meta-meta modeling method is a customizable modeling method at the meta-model level, which can perform customized modeling according to the design target. In the current technology CN115510563A, a model-based product development process design method and device, a meta-model library that conforms to the BPMN process modeling design specification is constructed to design the development process. However, when it comes to modeling an aircraft landing gear, it has the defect of being unable to describe the multi-disciplinary professional characteristics such as mechanical, electrical, hydraulic, and control. Summary of the invention

[0013] In view of this, the present invention provides a method and device for constructing a landing gear metamodel based on metamodeling, which can solve the technical problem that the existing technology cannot perform scalable modeling and design for the multi-disciplinary characteristics of the landing gear system, such as mechanical, electrical, hydraulic, and control.

[0014] In order to solve the above technical problems, the present invention is implemented as follows.

[0015] A method for constructing a landing gear metamodel based on metamodeling, comprising:

[0016] Step S1: splitting the aircraft landing gear according to five dimensions, namely, physical components, interfaces, technical indicators, processes involved in the development of aircraft landing gear engineering, and technical fields involved in each component, establishing a mapping relationship between the splitting result and the metamodel instance, and constructing the metamodel instance of the aircraft landing gear according to the mapping relationship; establishing a constraint relationship based on the structure, electromechanical, and thermal properties of the aircraft landing gear, and attaching the constraint relationship to the metamodel instance of each aircraft landing gear through modeling expression, and encapsulating the metamodel instance of the aircraft landing gear with the constraint condition attached; after encapsulation, the metamodel instance of the aircraft landing gear includes a landing gear diagram metamodel instance, a landing gear object metamodel instance, a landing gear relationship metamodel instance, a landing gear point metamodel instance, a landing gear attribute metamodel instance, and a landing gear role metamodel instance;

[0017] Step S2: determining the association relationship between the encapsulated metamodel instances of the aircraft landing gear;

[0018] Step S3: obtaining the physical properties of the aircraft landing gear to be modeled; dragging and encapsulating the metamodel instance of the aircraft landing gear in the modeling tool based on the physical properties, building the aircraft landing gear model, and assigning values ​​to each instance in the aircraft landing gear model.

[0019] Preferably, the physical components of the landing gear are a system that takes the aircraft landing gear as a whole, and is divided into a system level and a subsystem or / single-machine level according to the level, and the subsystem includes a main support, wheels, tires, brakes, retraction and extension locks, valves, retraction and extension actuators, main and standby power supplies, distributors, cable networks, and force / pressure / wheel speed / temperature sensors;

[0020] The interface includes an internal interface and an external interface;

[0021] The technical indicators include braking energy, ground contact static friction and / or sliding friction and / or rolling friction coefficient, landing gear layout, maximum braking actuation ratio, and maximum reduction ratio;

[0022] The process involved in the aircraft engineering development refers to the abstract design process when designing the aircraft landing gear, which includes six design stages: requirement design, function design, behavior design, composition design, parameter design, and interface design;

[0023] The various components described relate to technical fields, including mechanical, electrical, hydraulic, and control.

[0024] Preferably, in terms of the splitting result of the mapped aircraft landing gear, the landing gear graphic element model instance includes a structure graphic element model instance, a control graphic element model instance, a hydraulic graphic element model instance, an electrical graphic element model instance, a sensor graphic element model instance, and a file graphic element model instance;

[0025] The structural graphic element model instance is the graphic element required by the structural discipline in the development process of aircraft landing gear, including electromechanical actuators, tires, wheels, struts, struts, and dampers; the control graphic element model instance includes the graphic element required by the control discipline in the development process of landing gear, including controllers, storage units, and processing units; the hydraulic graphic element model instance is the graphic element required by the hydraulic discipline in the development process of landing gear, including actuators, shock absorbers, and valves; the electrical graphic element model instance is the graphic element required by the electrical discipline in the development process of aircraft landing gear, including batteries, cable networks, distributors, drive circuits, and processing circuits; the sensor graphic element model instance is the graphic element required by the sensor discipline in the development process of landing gear, including pressure sensors, temperature sensors, and wheel speed sensors; the file graphic element model instance is the graphic element of the development standard file involved in the development process of aircraft landing gear;

[0026] In terms of the process involved in the aircraft landing gear architecture design, the landing gear diagram metamodel instance includes a requirement analysis diagram class metamodel instance, a use case analysis diagram class metamodel instance, an activity behavior diagram class metamodel instance, a state analysis diagram class metamodel instance, a system composition diagram class metamodel instance, a parameter definition diagram class metamodel instance, and an internal composition diagram class metamodel instance;

[0027] The requirement analysis diagram class metamodel instance corresponds to the requirement design stage of the aircraft landing gear architecture design, and represents the functional and non-functional requirements of the aircraft landing gear; the use case analysis diagram class metamodel instance corresponds to the functional design stage of the aircraft landing gear architecture design, and represents the functions and sub-functions of the aircraft landing gear; the activity behavior diagram class metamodel instance and the state analysis diagram class metamodel instance correspond to the behavior design stage of the aircraft landing gear architecture design, and represent the event actions, state transitions, and behavior timing of the aircraft landing gear system involving the functions or sub-functions of the aircraft landing gear; the system composition diagram class metamodel instance The graph element model instance corresponds to the composition design stage of the aircraft landing gear architecture design, characterizing the decomposition, aggregation, and association relationship between the functions of the aircraft landing gear and the structure that carries the functions; the parameter definition graph class graph element model instance corresponds to the parameter design stage of the aircraft landing gear architecture design, characterizing the performance parameters, technical indicators and other parameter items and design constraints of each component of the aircraft landing gear; the internal composition graph class graph element model instance corresponds to the interface design stage of the aircraft landing gear architecture design, characterizing the interface type of each component of the aircraft landing gear, the objects transferred between each component, and the interface direction.

[0028] Preferably, the landing gear object metamodel instance is used to characterize the physical components of the aircraft landing gear, and includes a plurality of landing gear point metamodel instances and / or landing gear attribute metamodel instances; the landing gear relationship metamodel instance is used to characterize the information transfer relationship between the actual components of the aircraft landing gear, and the landing gear relationship metamodel instance is an abstract description of the association relationship between the landing gear object metamodel instances, and is associated with the landing gear object metamodel instance through the landing gear role metamodel instance; the landing gear role metamodel instance includes a landing gear attribute metamodel instance, and the landing gear role metamodel instance is used to describe the type and method of input and output of the information transfer relationship between different components of the actual physical product of the landing gear, and the landing gear role metamodel instance is an abstract description of how the aircraft relationship metamodel instance is connected to the landing gear object metamodel instance.

[0029] Preferably, the landing gear meta-model instance is a single meta-model instance or a composite meta-model instance, wherein the single meta-model instance only includes the landing gear meta-model instance; the composite meta-model instance includes the landing gear meta-model instance and also includes one or more of the landing gear object meta-model, the landing gear relationship meta-model, the landing gear point meta-model instance, the landing gear attribute meta-model instance, and the landing gear role meta-model instance.

[0030] The present invention provides a landing gear meta-model construction device based on meta-modeling, the device comprising:

[0031] Decomposition module: configured to decompose the aircraft landing gear according to five dimensions, namely, physical components, interfaces, technical indicators, processes involved in the development of aircraft landing gear engineering, and technical fields involved in each component, establish a mapping relationship between the decomposition result and the metamodel instance, and construct the metamodel instance of the aircraft landing gear according to the mapping relationship; establish a constraint relationship based on the structure, electromechanical, and thermal properties of the aircraft landing gear, attach the constraint relationship to the metamodel instance of each aircraft landing gear through modeling expression, and encapsulate the metamodel instance of the aircraft landing gear with the constraint condition attached; after encapsulation, the metamodel instance of the aircraft landing gear includes a landing gear diagram metamodel instance, a landing gear object metamodel instance, a landing gear relationship metamodel instance, a landing gear point metamodel instance, a landing gear attribute metamodel instance, and a landing gear role metamodel instance;

[0032] An association module: configured to determine an association relationship between the metamodel instances of the aircraft landing gear after encapsulation;

[0033] Model building module: configured to obtain the physical properties of the aircraft landing gear to be modeled; based on the physical properties, drag and drop the metamodel instance of the encapsulated aircraft landing gear in the modeling tool to build the aircraft landing gear model, and assign values ​​to each instance in the aircraft landing gear model.

[0034] The present invention provides a computer-readable storage medium, wherein a plurality of instructions are stored in the storage medium; the plurality of instructions are used for a processor to load and execute the method as described above.

[0035] An electronic device provided by the present invention is characterized in that the electronic device comprises:

[0036] A processor, which is used to execute multiple instructions;

[0037] A memory for storing a plurality of instructions;

[0038] The plurality of instructions are used to be stored by the memory and loaded and executed by the processor to implement the method as described above.

[0039] Beneficial effects:

[0040] (1) The present invention constructs a meta-model library for the development of a landing gear system based on the multi-disciplinary characteristics of the aircraft landing gear system, such as structure, electromechanical, and thermal. Compared with the existing technology CN115510563A, the above-mentioned meta-model library is not limited to specific views such as design process and system composition. It can be directly dragged and instantiated and relevant technical parameters can be filled in to support the engineering design of the landing gear system's retraction and extension system, control system, and electrical system. In view of the characteristics of the aircraft landing gear system, the present invention divides the aircraft landing gear into six dimensions: physical components, interfaces, technical indicators, processes involved in the aircraft landing gear architecture design, and technical fields involved in each component, and then constructs a meta-model instance suitable for the aircraft landing gear, saving the overall architecture design time.

[0041] (2) The present invention is developed based on the GOPPRR-E modeling theory. In addition to supporting the establishment of the above-mentioned landing gear specific domain model, the GOPPRR-E modeling theory can currently support the establishment of multiple architecture models such as UML, UPDM, SysML, etc., and supports the relationship between them, and is not limited to models in a certain field.

[0042] (3) The present invention adopts the GOPPRR-E modeling theory. The syntax of the underlying KARMA language not only supports modeling, but also supports the definition of custom model conversion rule syntax and the expansion of syntax. This not only ensures the consistency of language style, without the need to learn multiple languages ​​and reduce learning costs, but also supports the interoperability requirements of multiple different model export formats such as XML and OWL without changing the model.

[0043] (4) The underlying KARMA language used in the present invention has unified semantics. In addition to the metamodel in the above case, the underlying view metamodels of other view metamodels are also constructed based on the KARMA language, and there will be no ambiguity. The metamodel definition is flexible, and expansion only requires building the metamodel and metamodel binding relationship and recompiling. The extensibility is much stronger than existing modeling solutions such as SysML. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 A schematic diagram of the process flow of the landing gear metamodel construction method based on metamodeling provided by the present invention;

[0045] Figure 2 A schematic diagram of the framework of the landing gear metamodel construction method based on metamodeling provided by the present invention;

[0046] Figure 3 A schematic diagram of the structure of a landing gear metamodel building device based on metamodeling provided by the present invention. DETAILED DESCRIPTION

[0047] The present invention is described in detail below in conjunction with the accompanying drawings and embodiments.

[0048] like Figure 1-Figure 2 As shown, the present invention proposes a landing gear metamodel construction method based on metamodeling, comprising the following steps:

[0049] Step S1: splitting the aircraft landing gear according to five dimensions, namely, physical components, interfaces, technical indicators, processes involved in the development of aircraft landing gear engineering, and technical fields involved in each component, establishing a mapping relationship between the splitting result and the metamodel instance, and constructing the metamodel instance of the aircraft landing gear according to the mapping relationship; establishing a constraint relationship based on the structure, electromechanical, and thermal properties of the aircraft landing gear, and attaching the constraint relationship to the metamodel instance of each aircraft landing gear through modeling expression, and encapsulating the metamodel instance of the aircraft landing gear with the constraint condition attached; after encapsulation, the metamodel instance of the aircraft landing gear includes a landing gear diagram metamodel instance, a landing gear object metamodel instance, a landing gear relationship metamodel instance, a landing gear point metamodel instance, a landing gear attribute metamodel instance, and a landing gear role metamodel instance;

[0050] Step S2: determining the association relationship between the encapsulated metamodel instances of the aircraft landing gear;

[0051] Step S3: obtaining the physical properties of the aircraft landing gear to be modeled; dragging and encapsulating the metamodel instance of the aircraft landing gear in the modeling tool based on the physical properties, building the aircraft landing gear model, and assigning values ​​to each instance in the aircraft landing gear model.

[0052] In the present invention, the object-oriented architecture modeling method used is the GOPPRR-E (Graph, Object, Property, Point, Relationship, Role, Extension) meta-meta modeling method. The GOPPRR-E modeling method constructs a meta-model through six basic meta-meta models and extended relationships, constructs a model within a domain through the meta-model, and analyzes the system from multiple perspectives through the combination of models. The GOPPRR-E modeling method has a high level of abstraction, is not limited to a certain field, and can support model descriptions of multiple architectures. The modeling language based on the GOPPRR-E modeling method (such as: KARMA) can support the unified description of the design information and R&D process of complex systems in multiple fields.

[0053] The language used in this method is KARMA. KARMA is a multi-architecture modeling language that supports MBSE, proposed in the national standard plan "Systems and Software Engineering Model-based Unified Architecture Modeling Language for Systems Engineering" (No. 20230680-T-469), and recognized by the Science Popularization Workstation of the Chinese Society for Systems Engineering and the Software and Systems Engineering Branch of the National Standardization Committee. The text-based multi-architecture modeling language KARMA is created based on the GOPPRR modeling method, which can support the description of multi-architecture models from different perspectives and complete the description of the entire development process of complex systems. This method is executed in the multi-architecture modeling tool MetaGraph. MetaGraph is a tool for modeling and analysis of model-based systems engineering related languages ​​based on the multi-architecture unified modeling language KARMA. The platform can express MBSE models in a text-readable formal language, realize the development and modeling of model libraries of different general modeling languages ​​and frameworks, such as UML, SysML, BPMN, Capella, DoDAF, UAF, etc. It can also support the development and modeling of model libraries based on frameworks for specific domain modeling languages, such as EAST-ADL, etc.

[0054] The meta-metamodel is composed of the description of the structure and semantics of meta-metadata, and is an abstract language defined to describe the meta-model. The definition of the meta-metamodel is more abstract and concise than the meta-model (that is, the meta-metamodel is a deeper level of abstraction about the meta-metadata itself, that is, it is an abstraction that describes the meta-metadata). A meta-metamodel can define multiple meta-models, and a meta-model is an instance of a meta-metamodel.

[0055] The present invention is based on the landing gear system, the engineering design personnel determine the basic elements required for designing the system, and then construct the icon corresponding to the system based on the meta-model representation. The modeling needs to follow the modeling theory of the GOPPRR-E meta-meta-model, that is, first define the meta-meta-model of the model, then combine the meta-meta-model to define the meta-model, use the meta-model to define the specific domain model, and combine different models into a model layer that can describe the landing gear system.

[0056] The step S1, wherein:

[0057] In the present invention, according to the existing and historical product realization data of the landing gear system, the existing design scheme of the landing gear is summarized and summarized. The design scheme includes the physical components, interfaces and technical indicators of the landing gear.

[0058] The physical components of the landing gear are the aircraft landing gear as a whole system, which is divided into system level and subsystem or / single-machine level. Taking the subsystem as an example, it includes main struts, wheels, tires, brakes, retraction and extension locks, valves, retraction and extension actuators, main and standby power supplies, distributors, cable networks, force / pressure / wheel speed / temperature sensors, etc.

[0059] The interface includes internal interface and external interface. The internal interface includes the electrical interface of the aircraft landing gear, the 28V control positive and negative pole interface, etc.; the external interface includes the external interface of the GNC system, the 1553B bus protocol communication interface, etc.

[0060] Technical indicators include braking energy, ground contact static friction / sliding friction / rolling friction coefficient, landing gear layout, maximum braking actuation ratio, maximum reduction ratio, etc.

[0061] The process involved in aircraft engineering development refers to the abstract design process when designing the aircraft landing gear, which includes six design stages: requirement design, function design, behavior design, composition design, parameter design, and interface design.

[0062] Each component involves a technical field. Since each system-level, subsystem or / stand-alone-machine-level component of the aircraft landing gear has multi-field coupling characteristics, the technical field involved by each component is divided into mechanical, electrical, hydraulic and control.

[0063] The constraint relationship is a specific condition of each metamodel instance of the aircraft landing gear. For example, specific conditions are imposed on each metamodel instance of the aircraft landing gear according to the actual product characteristics and information of the aircraft landing gear. For example, the electrical interface of the landing gear includes interfaces such as the positive and negative electrodes of the 28V control electricity. The above interface is modeled and expressed only through the metamodel instance of the "control electricity port" point, and does not exist in other metamodel instances.

[0064] According to the six meta-meta-models of graph, object, relationship, attribute, point and role provided by GOPPRR-E modeling theory, a meta-model instance of the aircraft landing gear is constructed, and the meta-model instance includes a graph meta-model instance, an object meta-model instance, a relationship meta-model instance, a point meta-model instance, an attribute meta-model instance and a role meta-model instance; after encapsulation, the meta-model instance of the aircraft landing gear includes a landing gear graph meta-model instance, a landing gear object meta-model instance, a landing gear relationship meta-model instance, a landing gear point meta-model instance, a landing gear attribute meta-model instance and a landing gear role meta-model instance; after encapsulation, the meta-model instance of the aircraft landing gear is used to construct an aircraft landing gear system model instance by dragging and dropping modeling in the modeling software MetaGraph in subsequent use.

[0065] Furthermore, the landing gear metamodel instance is used to describe the system composition and internal interactive interface relationship of the aircraft landing gear. It is an abstract description of the actual engineering product of the aircraft landing gear, and is an element composed of a collection of five other metamodel instances. In terms of structure, the landing gear metamodel instance is a single metamodel instance or a composite metamodel instance, and the single metamodel instance only includes the landing gear metamodel instance; the composite metamodel instance includes the landing gear metamodel instance, and also includes one or more of the landing gear object metamodel, the landing gear relationship metamodel, the landing gear point metamodel instance, the landing gear attribute metamodel instance, and the landing gear role metamodel instance.

[0066] For example, both the "left rear landing gear" and the "integrated control unit" have certain internal components. For example, the "left rear landing gear" may include components such as the "main strut", "wheel", and "brake device", and the "integrated control unit" may include components such as the "left EMAC drive circuit" and "left and right Hall sensor processing circuits". It is necessary to use a unified "landing gear physical composition diagram" metamodel to describe the components, interface relationships and other elements contained therein in a unified manner. Therefore, the "landing gear physical composition diagram" metamodel needs to include object metamodel instances such as "electromechanical actuator" to represent the actual components of the landing gear, relationship metamodel instances such as "electrical interaction" to describe the interaction relationship between the components of the landing gear, role metamodel instances such as "electrical interaction start" and "electrical interaction terminal" to describe the beginning and end of the interaction relationship between the components of the landing gear, point metamodel instances such as "electrical port" to describe the type of landing gear interaction interface, and attribute metamodel instances such as "impedance", "frequency", and "torque" to describe the key technical parameters of the components of the landing gear.

[0067] In terms of the splitting results of the mapped aircraft landing gear, the landing gear meta model instances include structure class meta model instances, control class meta model instances, hydraulic class meta model instances, electrical class meta model instances, sensor class meta model instances, and file class meta model instances.

[0068] Among them, the structural graphic element model instance is the graphic element required by the structural discipline in the process of aircraft landing gear development, such as electromechanical actuators, tires, wheels, struts, struts, dampers, etc.; the control graphic element model instance includes the graphic element required by the control discipline in the process of landing gear development, such as controllers, storage units, processing units, etc.; the hydraulic graphic element model instance is the graphic element required by the hydraulic discipline in the process of landing gear development, such as actuators, shock absorbers, valves, etc.; the electrical graphic element model instance is the graphic element required by the electrical discipline in the process of aircraft landing gear development, such as batteries, cable networks, distributors, drive circuits, processing circuits, etc.; the sensor graphic element model instance is the graphic element required by the sensor discipline in the process of landing gear development, such as pressure sensors, temperature sensors, wheel speed sensors, etc.; the file graphic element model instance is the graphic element of the development standard document involved in the process of aircraft landing gear development, such as GJB1184A-2005 "General Specifications for Aircraft Wheels and Braking Devices".

[0069] In terms of the processes involved in the design of aircraft landing gear architecture, the landing gear meta-model instances include requirement analysis diagram class meta-model instances, use case analysis diagram class meta-model instances, activity behavior diagram class meta-model instances, state analysis diagram class meta-model instances, system composition diagram class meta-model instances, parameter definition diagram class meta-model instances, and internal composition diagram class meta-model instances.

[0070] The requirement analysis diagram class element model instance corresponds to the requirement design stage of the aircraft landing gear architecture design, and represents the functional requirements and non-functional requirements for the aircraft landing gear. The functional requirement is, for example, to provide an aircraft deceleration function, and the non-functional requirement is, for example, the braking performance of the landing gear system.

[0071] The use case analysis diagram class metamodel instance corresponds to the functional design stage of the aircraft landing gear architecture design, and represents the functions and sub-functions of the aircraft landing gear, such as braking, steering, door retraction and extension, ground driving, touchdown, and takeoff.

[0072] The activity behavior graph class metamodel instance and the state analysis graph class metamodel instance correspond to the behavior design stage of the aircraft landing gear architecture design, and characterize the event actions, state transitions, and behavior timing of the aircraft landing gear system involving the functions or sub-functions of the aircraft landing gear. The event actions include power supply self-check and aircraft braking, and the state transitions include aircraft descent, aircraft level flight, and aircraft leveling.

[0073] The system composition diagram class element model instance corresponds to the composition design stage of the aircraft landing gear architecture design, and represents the decomposition, aggregation, and association relationship between the function of the aircraft landing gear and the structure that carries the function. The system function is, for example, braking, and the structure that carries the function is, for example, a braking device.

[0074] The parameter definition graph class model instance corresponds to the parameter design stage of the aircraft landing gear architecture design, and represents the performance parameters, technical indicators and other parameter items and design constraints of each component of the aircraft landing gear. The performance parameter is, for example, the maximum reduction ratio, the technical indicator is, for example, the maximum reduction actuation ratio, and the parameter items and design constraints are, for example, the brake capacity mechanism formula.

[0075] The internal composition graph class element model instance corresponds to the interface design stage of the aircraft landing gear architecture design, and represents the interface type, the object transmitted between the components, and the interface direction of each component of the aircraft landing gear. The interface type is, for example, a 28V control electrical interface, the object transmitted between the components is, for example, current, hydraulic pressure, etc., and the interface direction is, for example, the positive and negative poles of the control electricity.

[0076] The landing gear object metamodel instance is used to characterize the physical components of the aircraft landing gear, and the object metamodel instance includes a plurality of point metamodel instances and / or a plurality of attribute metamodel instances.

[0077] The aircraft object metamodel instance includes metamodel instances such as attributes and points. The landing gear object metamodel instance is mainly used to describe the components of the landing gear physical product. The abstract description of an entity in the landing gear metamodel instance may further include several landing gear point metamodel instances and landing gear attribute metamodel instances. Among them, typical landing gear object metamodel instances include elements such as "electromechanical actuator", "controller", "sensor", "wheel" and "brake device". Among them, taking the "brake device" as an example, the "brake device" is a rectangular box containing a brake wheel and brake pad device icon, indicating a specific device or product that performs a braking function in the landing gear physical product.

[0078] From the perspective of the splitting results of the mapped aircraft landing gear, the landing gear object metamodel instances include structure class object metamodel instances, control class object metamodel instances, hydraulic class object metamodel instances, electrical class object metamodel instances, sensor class object metamodel instances, and file class object metamodel instances.

[0079] Among them, the structural object metamodel instance is the object elements required by the structural discipline in the development process of aircraft landing gear, such as electromechanical actuators, tires, wheels, struts, struts, dampers, etc.; the control object metamodel instance includes the object elements required by the control discipline in the development process of landing gear, such as controllers, storage units, processing units, etc.; the hydraulic object metamodel instance is the object elements required by the hydraulic discipline in the development process of landing gear, such as actuators, shock absorbers, valves, etc.; the electrical object metamodel instance is the object elements required by the electrical discipline in the development process of aircraft landing gear, such as batteries, cable networks, distributors, drive circuits, processing circuits, etc.; the sensor object metamodel instance is the object elements required by the sensor discipline in the development process of landing gear, such as pressure sensors, temperature sensors, wheel speed sensors, etc.; the file object metamodel instance is the development standard documents involved in the development process of aircraft landing gear, such as GJB1184A-2005 "General Specifications for Aircraft Wheels and Braking Devices".

[0080] The landing gear point metamodel instance is used to characterize the interface types and interaction transactions between the actual components of the aircraft landing gear. It is an abstract description of the interface in the landing gear object metamodel instance that is connected to the aircraft relationship metamodel instance. The landing gear point metamodel instance includes a landing gear attribute metamodel instance.

[0081] In the present invention, the landing gear point metamodel instance includes a landing gear attribute metamodel instance, and the landing gear point metamodel instance is used to describe the interface types and interactive things that interact between the actual components of the landing gear, and is an abstract description of the interface in the landing gear object metamodel instance that is connected to the landing gear relationship / aircraft role metamodel instance. The interface refers to the means by which the object metamodel instance provides internal information to the outside world by satisfying certain specific conditions. For example, the electric brake may interact with the outside world through the three-phase drive signal of the motor, so the electric brake has the "electrical port" metamodel element. The landing gear point metamodel instance cannot exist independently and must be attached to the landing gear object metamodel instance.

[0082] The landing gear relationship meta-instance is used to characterize the information transfer relationship between the actual components of the aircraft landing gear. The landing gear relationship meta-model instance is an abstract description of the association relationship between the landing gear object meta-model instances, and is associated with the landing gear object meta-model instance through the landing gear role meta-model instance.

[0083] In the present invention, the landing gear relationship metamodel instance includes a landing gear role and a landing gear relationship metamodel instance, the landing gear relationship metamodel is used to describe the information transmission and other relationships between different components of the actual landing gear product, and the landing gear relationship metamodel instance refers to an abstract description of the association relationship between the landing gear object metamodel instances, and is associated with the landing gear object metamodel instance through the landing gear role metamodel instance. Among them, typical landing gear relationship metamodel instances include relationship elements such as "electrical interaction" and "force interaction".

[0084] The landing gear role metamodel instance is used to characterize the type and method of input and output of information transmission between the actual components of the aircraft landing gear. The landing gear role metamodel instance is an abstract description of how the landing gear relationship metamodel instance is connected to the landing gear object metamodel instance.

[0085] The landing gear role metamodel instance includes a landing gear attribute metamodel instance, and the landing gear role metamodel instance is used to describe the information transmission relationship between different components of the landing gear physical actual product through what type and method the input and output are performed, and the landing gear role metamodel instance is an abstract description of how the aircraft relationship metamodel instance is connected to the landing gear object metamodel instance. Among them, the typical landing gear role metamodel instance includes elements such as the start and end of "electrical interaction".

[0086] The landing gear point metamodel instance is used to describe the interface types and interaction transactions between the actual components of the landing gear, and is an abstract description of the interface connected to the relationship / role metamodel instance in the object metamodel instance. The landing gear attribute metamodel instance is an abstract description of the attributes of the technical parameters in each architecture view of the landing gear.

[0087] Furthermore, the metamodel is an instance of the meta-metamodel, and all metamodel instance definitions are completed through the form-based navigation configuration window of the metamodel definition in the MetaGraph modeling tool.

[0088] The step S2: determining the association relationship between the metamodel instances of the aircraft landing gear after encapsulation, aims to construct a metamodel library of an aircraft landing gear system that meets the requirements according to the aircraft landing gear information by defining the basic association relationship between the landing gear diagram metamodel instance, the landing gear object metamodel instance, the landing gear relationship metamodel instance, the landing gear point metamodel instance, the landing gear attribute metamodel instance, and the landing gear role metamodel instance. The landing gear metamodel library means that the user reuses the metamodel instance elements contained therein and realizes the description of key development information such as the composition and interaction of the landing gear system through drag-and-drop modeling.

[0089] In this embodiment, there are six types of association relationships between landing gear metamodel instances: role relationship association relationship, object relationship association relationship, decomposition and analysis association relationship, object attribute association relationship, object point association relationship, and relationship point association relationship.

[0090] Wherein: 1) the role relationship association relationship is to connect the designated landing gear role metamodel instance at both ends of the landing gear relationship metamodel instance, and describe the input and output styles and information of the landing gear relationship metamodel; 2) the object relationship association relationship is to connect the designated landing gear object metamodel instance at both ends of the landing gear relationship metamodel instance, and specify the landing gear object metamodel instance to which the landing gear relationship metamodel instance can be connected, and the landing gear object metamodel instance that is not designated cannot be connected through the landing gear relationship metamodel instance; 3) the decomposition view association relationship is defined as to specify the landing gear metamodel instance in the landing gear object metamodel instance, and specify the landing gear metamodel instance information that needs to be expanded to represent the landing gear metamodel instance, and the landing gear metamodel instance that is not designated does not have the ability to be expanded to represent the landing gear metamodel instance; 4) the object attribute association relationship is defined as to specify the landing gear metamodel instance in the landing gear object metamodel instance, and specify the landing gear metamodel instance information that needs to be expanded to represent the landing gear metamodel instance; 5) the object attribute association relationship is defined as to specify the landing gear metamodel instance in the landing gear relationship metamodel instance, and specify the landing gear metamodel instance information that needs to be expanded to represent the landing gear metamodel instance. The landing gear attribute metamodel instance is specified in the metamodel instance, and the landing gear attribute metamodel instance information contained in the landing gear object metamodel instance is specified. For the landing gear attribute metamodel instance that is not specified, the landing gear object metamodel instance does not have the value of the landing gear attribute metamodel instance; 5) The object point association relationship is defined as specifying the landing gear point metamodel instance in the landing gear object metamodel instance, specifying the landing gear point metamodel instance information contained in the landing gear object metamodel instance, and for the landing gear point metamodel instance that is not specified, the landing gear object metamodel instance does not have the name and attribute value of the landing gear point metamodel instance; 6) The point relationship association relationship is defined as connecting the specified landing gear point metamodel instance at both ends of the landing gear relationship metamodel instance, specifying the landing gear point metamodel instance that the landing gear relationship metamodel instance can be connected to, and the landing gear point metamodel instance that is not specified cannot be connected through the landing gear relationship metamodel instance.

[0091] In this embodiment, the role relationship association relationship, for example, both ends of the "force interaction" relationship metamodel instance need to be bound to the corresponding start and end role metamodel instances; the object relationship association relationship, for example, the start end of the "physical composition" relationship can be connected to the "landing gear" object metamodel instance with the name attribute "front main landing gear", and the end end can also be connected to the "brake device" object metamodel instance with the name attribute "electromechanical actuated brake device"; the decomposed anatomical association relationship definition, for example, a "landing gear" object metamodel can contain a complete "landing gear physical composition" "Figure" figure metamodel instance; the object attribute association relationship definition, for example, the object metamodel instance of "landing gear" with the name attribute "front main landing gear" needs to include attribute metamodel instances such as "name", "wheelbase" and "layout form"; object point association relationship definition, for example, the object metamodel instance of "ground" with the name attribute "airport ground" can include two point metamodel instances of "force port" and "signal port"; relationship point association relationship definition, for example, the relationship metamodel of "force interaction" can be connected to the point metamodel instance of "force port" on the "ground" object model instance.

[0092] Furthermore, all the association relationship definitions in this embodiment are completed through the form-based navigation configuration window of the metamodel definition in the MetaGraph modeling tool.

[0093] The step S3 comprises: obtaining the landing gear information of the aircraft to be modeled, obtaining the attributes of the landing gear of the aircraft from the landing gear information, wherein the attributes include the product composition, interface and technical indicators of the landing gear system and its components, such as the wheel of the landing gear including a wheel speed sensor, the wheel speed sensor and the integrated control unit having multiple sine signals, cosine signals and excitation signals, and the key technical indicators of the wheel speed sensor (such as excitation voltage, transformation ratio, open-circuit input impedance, etc.); based on the attributes, dragging the meta-model instance in the modeling tool to construct the meta-model instance corresponding to the meta-model instance. An aircraft landing gear model is created, and a metamodel instance of the aircraft landing gear model is assigned a value. For example, the landing gear system and wheel speed sensor mentioned above can be modeled by the two object metamodels of "landing gear" and "speed sensor", respectively. The input and output ports of sine signals, cosine signals and excitation signals can be modeled by multiple "signal port" point metamodels on the "speed sensor" object metamodel. Key technical indicators such as excitation voltage, transformation ratio, open-circuit input impedance, etc. can be modeled by attribute metamodels such as "voltage", "ratio", and "impedance" on the "speed sensor" object metamodel.

[0094] In the present invention, based on the actual development of the landing gear system, the corresponding landing gear system model instance is determined, and the landing gear system model covers the key elements required for the development of the engineering system, such as the landing gear product module composition, the landing gear product module interface relationship, the landing gear product key attributes, etc.; by dragging the metamodel instance constructed in step 1 in the modeling tool, the modeling tool automatically generates a landing gear system model instance. The "landing gear brake physical scene graph model" is a model graph associated with the actual operation scene of the landing gear system based on the above metamodel representation.

[0095] In this embodiment, the landing gear system model instance is defined according to the constructed metamodel instance. By dragging the constructed metamodel to the tool canvas in the MetaGraph modeling tool, the modeling tool automatically generates a model instance. By adding information in the attribute column of the model instance, for example, after dragging a "landing gear" object metamodel instance into the canvas, by assigning its attribute metamodel instance "name" to "front main landing gear" in the attribute column, the attribute metamodel instance "wheelbase" is assigned to "6.51m", the attribute metamodel instance "layout form" is assigned to "three-point type", and so on. The MetaGraph modeling tool will automatically generate a "landing gear" object model instance, which has the key parameter information required for the actual composition of the landing gear.

[0096] The present invention also provides a landing gear meta-model construction device based on meta-modeling, such as Figure 3 As shown, the device comprises:

[0097] Decomposition module: configured to decompose the aircraft landing gear according to five dimensions, namely, physical components, interfaces, technical indicators, processes involved in the development of aircraft landing gear engineering, and technical fields involved in each component, establish a mapping relationship between the decomposition result and the metamodel instance, and construct the metamodel instance of the aircraft landing gear according to the mapping relationship; establish a constraint relationship based on the structure, electromechanical, and thermal properties of the aircraft landing gear, attach the constraint relationship to the metamodel instance of each aircraft landing gear through modeling expression, and encapsulate the metamodel instance of the aircraft landing gear with the constraint condition attached; after encapsulation, the metamodel instance of the aircraft landing gear includes a landing gear diagram metamodel instance, a landing gear object metamodel instance, a landing gear relationship metamodel instance, a landing gear point metamodel instance, a landing gear attribute metamodel instance, and a landing gear role metamodel instance;

[0098] An association module: configured to determine an association relationship between the metamodel instances of the aircraft landing gear after encapsulation;

[0099] Model building module: configured to obtain the physical properties of the aircraft landing gear to be modeled; based on the physical properties, drag and drop the metamodel instance of the encapsulated aircraft landing gear in the modeling tool to build the aircraft landing gear model, and assign values ​​to each instance in the aircraft landing gear model.

[0100] The above specific embodiments only describe the design principle of the present invention. The shapes and names of the components in the description may be different and are not limited. Therefore, those skilled in the art in the field of the present invention may modify or replace the technical solutions recorded in the above embodiments; and these modifications and replacements do not deviate from the creative purpose and technical solutions of the present invention and should all fall within the protection scope of the present invention.

Claims

1. A method for constructing a landing gear metamodel based on metamodeling, characterized in that: include: Step S1: splitting the aircraft landing gear according to five dimensions, namely, physical components, interfaces, technical indicators, processes involved in the development of aircraft landing gear engineering, and technical fields involved in each component, establishing a mapping relationship between the splitting result and the metamodel instance, and constructing the metamodel instance of the aircraft landing gear according to the mapping relationship; establishing a constraint relationship based on the structure, electromechanical, and thermal properties of the aircraft landing gear, and attaching the constraint relationship to the metamodel instance of each aircraft landing gear through modeling expression, and encapsulating the metamodel instance of the aircraft landing gear with the constraint condition attached; after encapsulation, the metamodel instance of the aircraft landing gear includes a landing gear diagram metamodel instance, a landing gear object metamodel instance, a landing gear relationship metamodel instance, a landing gear point metamodel instance, a landing gear attribute metamodel instance, and a landing gear role metamodel instance; Step S2: determining the association relationship between the encapsulated metamodel instances of the aircraft landing gear; Step S3: obtaining the physical properties of the aircraft landing gear to be modeled; dragging and encapsulating the metamodel instance of the aircraft landing gear in the modeling tool based on the physical properties, building the aircraft landing gear model, and assigning values ​​to each instance in the aircraft landing gear model.

2. The method according to claim 1, characterized in that The physical components of the landing gear are a system that takes the aircraft landing gear as a whole, and are divided into a system level and a subsystem or / single-machine level according to the level. The subsystem includes the main strut, wheels, tires, brakes, retraction and extension locks, valves, retraction and extension actuators, main and standby power supplies, distributors, cable networks, and force / pressure / wheel speed / temperature sensors; The interface includes an internal interface and an external interface; The technical indicators include braking energy, ground contact static friction and / or sliding friction and / or rolling friction coefficient, landing gear layout, maximum braking actuation ratio, and maximum reduction ratio; The process involved in the development of aircraft landing gear engineering refers to the abstract design process when designing aircraft landing gear, which includes six design stages: requirement design, function design, behavior design, composition design, parameter design, and interface design. The various components described relate to technical fields, including mechanical, electrical, hydraulic, and control.

3. The method according to claim 1, characterized in that In terms of the splitting result of the mapped aircraft landing gear, the landing gear metamodel instance includes a structure metamodel instance, a control metamodel instance, a hydraulic metamodel instance, an electrical metamodel instance, a sensor metamodel instance, and a file metamodel instance; The structural graphic element model instance is the graphic element required by the structural discipline in the development process of aircraft landing gear, including electromechanical actuators, tires, wheels, struts, struts, and dampers; the control graphic element model instance includes the graphic element required by the control discipline in the development process of landing gear, including controllers, storage units, and processing units; the hydraulic graphic element model instance is the graphic element required by the hydraulic discipline in the development process of landing gear, including actuators, shock absorbers, and valves; the electrical graphic element model instance is the graphic element required by the electrical discipline in the development process of aircraft landing gear, including batteries, cable networks, distributors, drive circuits, and processing circuits; the sensor graphic element model instance is the graphic element required by the sensor discipline in the development process of landing gear, including pressure sensors, temperature sensors, and wheel speed sensors; the file graphic element model instance is the graphic element of the development standard file involved in the development process of aircraft landing gear; In terms of the process involved in the aircraft landing gear architecture design, the landing gear diagram metamodel instance includes a requirement analysis diagram class metamodel instance, a use case analysis diagram class metamodel instance, an activity behavior diagram class metamodel instance, a state analysis diagram class metamodel instance, a system composition diagram class metamodel instance, a parameter definition diagram class metamodel instance, and an internal composition diagram class metamodel instance; The requirement analysis diagram class metamodel instance corresponds to the requirement design stage of the aircraft landing gear architecture design, and represents the functional requirements and non-functional requirements of the aircraft landing gear; the use case analysis diagram class metamodel instance corresponds to the functional design stage of the aircraft landing gear architecture design, and represents the functions and sub-functions of the aircraft landing gear; the activity behavior diagram class metamodel instance and the state analysis diagram class metamodel instance correspond to the behavior design stage of the aircraft landing gear architecture design, and represent the event actions, state transitions, and behavior timing of the aircraft landing gear system involving the functions or sub-functions of the aircraft landing gear; The system composition diagram class element model instance corresponds to the composition design stage of the aircraft landing gear architecture design, and represents the decomposition, aggregation, and association relationship between the functions of the aircraft landing gear and the structure that carries the functions; The parameter definition graph class element model instance corresponds to the parameter design stage of the aircraft landing gear architecture design, and represents the performance parameters of each component of the aircraft landing gear, parameter items of technical indicators and design constraints; the internal composition graph class element model instance corresponds to the interface design stage of the aircraft landing gear architecture design, and represents the interface type of each component of the aircraft landing gear, the objects transferred between the components, and the interface direction.

4. The method according to claim 1, characterized in that The landing gear object metamodel instance is used to characterize the physical components of the aircraft landing gear, and includes several landing gear point metamodel instances and / or landing gear attribute metamodel instances; the landing gear relationship metamodel instance is used to characterize the information transfer relationship between the actual components of the aircraft landing gear, and the landing gear relationship metamodel instance is an abstract description of the association relationship between the landing gear object metamodel instances, and is associated with the landing gear object metamodel instance through the landing gear role metamodel instance; the landing gear role metamodel instance includes a landing gear attribute metamodel instance, and the landing gear role metamodel instance is used to describe the type and method of input and output of the information transfer relationship between different components of the actual physical product of the landing gear, and the landing gear role metamodel instance is an abstract description of how the aircraft relationship metamodel instance is connected to the landing gear object metamodel instance.

5. The method according to any one of claims 1 to 4, characterized in that The landing gear meta-model instance is a single meta-model instance or a composite meta-model instance, wherein the single meta-model instance only includes the landing gear meta-model instance; the composite meta-model instance includes the landing gear meta-model instance and also includes one or more of the landing gear object meta-model, the landing gear relationship meta-model, the landing gear point meta-model instance, the landing gear attribute meta-model instance, and the landing gear role meta-model instance.

6. A landing gear metamodel construction device based on metamodeling, characterized in that: include: Decomposition module: configured to decompose the aircraft landing gear according to five dimensions, namely, physical components, interfaces, technical indicators, processes involved in the development of aircraft landing gear engineering, and technical fields involved in each component, establish a mapping relationship between the decomposition result and the metamodel instance, and construct the metamodel instance of the aircraft landing gear according to the mapping relationship; establish a constraint relationship based on the structure, electromechanical, and thermal properties of the aircraft landing gear, attach the constraint relationship to the metamodel instance of each aircraft landing gear through modeling expression, and encapsulate the metamodel instance of the aircraft landing gear with the constraint condition attached; after encapsulation, the metamodel instance of the aircraft landing gear includes a landing gear diagram metamodel instance, a landing gear object metamodel instance, a landing gear relationship metamodel instance, a landing gear point metamodel instance, a landing gear attribute metamodel instance, and a landing gear role metamodel instance; An association module: configured to determine an association relationship between the metamodel instances of the aircraft landing gear after encapsulation; Model building module: configured to obtain physical properties of the landing gear of the aircraft to be modeled; Based on the physical properties, the metamodel instance of the aircraft landing gear is dragged and packaged in a modeling tool to build an aircraft landing gear model, and values ​​are assigned to each instance in the aircraft landing gear model.

7. A computer-readable storage medium, wherein a plurality of instructions are stored in the storage medium; the plurality of instructions are used for a processor to load and execute the method as claimed in any one of claims 1 to 5.

8. An electronic device, characterized in that: The electronic device comprises: A processor, which is used to execute multiple instructions; A memory for storing a plurality of instructions; The plurality of instructions are used to be stored in the memory and loaded and executed by the processor according to any one of claims 1 to 5.

Images