CN113806940B - Digital twin representation and naming method - Google Patents
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Abstract
The invention discloses a novel digital twin representation and naming method, which respectively models different types of physical entities into digital twin bodies, wherein each digital twin body comprises a plurality of components, and each component comprises: data and/or functions; the data are description data and/or state data of the corresponding physical entity, and the function is a service or physical characteristic which can be provided by the corresponding physical entity; the digital twin is named in a set mode, the components contained in the digital twin are uniquely named based on the component ID, and the components belonging to the same digital twin are stored on different nodes or servers in a network in a distributed mode or are stored in the same physical position in a centralized mode. The method can comprehensively, accurately and uniquely represent the digital twin and the relation among the digital twin components, more accurately reflect the real situation of the physical space and better integrate the resources of the actual scene.
Description
Technical Field
The invention relates to the technical field of computer networks, in particular to a digital twin representation and naming method.
Background
Along with the gradual becoming of human production life factor of a large amount of intelligent agents that have the ability such as perception, reasoning and execution, interaction cooperation between intelligent agent and people and intelligent agent is frequent, virtual space and physical space are mutual integration increasingly, and the network is changed from traditional information transmission to the novel intelligent agent information service that provides people, machine, thing integration. But the existing network space and physical space are blocked, and the efficiency is low in forming intelligent agent closed-loop information service of information transmission, intelligent decision and on-line control. At present, the problems that the digitization and intelligent expression of physical entities are difficult to support, the requirements of the cross-space efficient intelligent information service are difficult to meet and the like mainly exist.
In order to better realize novel applications such as unmanned, intelligent manufacturing, etc., deep interaction and fusion of physical space and network space are required. The digital twin is to fully utilize data such as a physical model, sensor update, operation history and the like, integrate simulation processes of multiple disciplines, multiple physical quantities, multiple scales and multiple probabilities, and complete mapping in a virtual space, thereby reflecting the full life cycle process of corresponding entity equipment. By constructing an interactive loop between the physical space and the digital space, the digital twin can realize the full-scale, real-time and accurate digital representation of the physical entity, and the copying and interaction of the physical entity in the virtual space can be realized. The digital twin technology can greatly improve the information transmission efficiency between the physical space and the network space, and realize the efficient integration, organization and scheduling of various resources in different scenes, thereby achieving the deep collaboration between virtual and real and improving the task execution efficiency.
The digital twin technology is an excellent idea for showing the possibility of virtual-real space cooperation, but when the existing digital twin implementation technology is introduced into a network space, the representation and naming system are not clear enough, the hierarchical relationship cannot be well represented, the deep cooperation between virtual and real can not be effectively realized, and the task execution efficiency is still to be improved.
Disclosure of Invention
The invention aims to provide a novel digital twin representation method and a naming method, which can comprehensively, accurately and uniquely represent digital twin and the relationship among digital twin components, more accurately reflect the real condition of a physical space and better integrate the resources of an actual scene.
The invention aims at realizing the following technical scheme:
a method of digital twin representation and naming, comprising:
modeling different classes of physical entities separately as digital twins, each digital twins comprising a number of components, each component comprising: data and/or functions; the data are description data and/or state data of the corresponding physical entity, and the function is a service or physical characteristic which can be provided by the corresponding physical entity;
the digital twin is named in a set mode, the components contained in the digital twin are uniquely named based on the component ID, and the components belonging to the same digital twin are stored on different nodes or servers in a network in a distributed mode or are stored in the same physical position in a centralized mode.
According to the technical scheme provided by the invention, on one hand, the digital twin body representation form has a clear storage structure, supports nesting of the digital twin body, provides an interface convenient to call, can easily check related information of the digital twin body, and uses the service function provided by the digital twin body to establish a foundation for calling requirements of upper-layer services, and the twin body component supports centralized and distributed storage, is suitable for flexible existence forms in a network, and facilitates storage of the twin body in the network; on the other hand, the resources of the actual scene can be better integrated, and the task execution efficiency is ensured.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present 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 flow chart of a digital twinning representation and naming method provided by an embodiment of the present invention;
FIG. 2 is a schematic diagram of component properties according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of different components in a digital twin body according to an embodiment of the present invention flexibly stored in a network or operated at different physical locations;
FIG. 4 is a schematic diagram of error occurrence in Merkle tree structure according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a portion of a digital twin body assembly of an individual vehicle 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 fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. 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 fall within the scope of the invention.
In order to smoothly introduce a digital twin of a physical entity into a network space and realize information application of a physical space and network space fusion type, the embodiment of the invention provides a novel digital twin representation and naming method, and designs a representation form and naming mode of the digital twin in a network, so that the digital twin in the network can be managed and called to support services. The purpose of designing the representation form of the digital twin in the network is to ensure the storage form of the digital twin, provide designed service interfaces for different digital twin or other individuals in the network, allow the invocation of services oriented to the digital twin in the network, and further provide service as functional support for the digital twin layer to the upper layer architecture.
The terms that may be used herein will first be described as follows:
the term "and/or" is intended to mean that either or both may be implemented, e.g., X and/or Y are intended to include both the cases of "X" or "Y" and the cases of "X and Y".
The terms "comprises," "comprising," "includes," "including," "has," "having" or other similar referents are to be construed to cover a non-exclusive inclusion. For example: including a particular feature (e.g., a starting material, component, ingredient, carrier, formulation, material, dimension, part, means, mechanism, apparatus, step, procedure, method, reaction condition, processing condition, parameter, algorithm, signal, data, product or article of manufacture, etc.), should be construed as including not only a particular feature but also other features known in the art that are not explicitly recited.
A digital twin representation and naming method provided by the present invention is described in detail below. What is not described in detail in the embodiments of the present invention belongs to the prior art known to those skilled in the art. The specific conditions are not noted in the examples of the present invention and are carried out according to the conditions conventional in the art or suggested by the manufacturer.
As shown in fig. 1, a digital twin representation and naming method includes the steps of:
1. modeling different classes of physical entities separately as digital twins, each digital twins comprising a number of components, each component comprising: data and/or functions; the data is description data and/or status data of the corresponding physical entity, and the function is a service or physical property that can be provided by the corresponding physical entity.
In the embodiment of the invention, various physical entities are respectively modeled as digital twin bodies, the digital twin bodies are a representation form of the physical entities in the network space, and the digital twin bodies in one network not only contain data, such as description and state data of the physical entities, but also contain certain functions, such as specific services or physical characteristics which can be provided by the physical entities, and can be represented by a function. Thus, to achieve the existence of such digital twins in a network information system, a relevant data structure is designed and a relevant naming hierarchy is established.
As described above, the components may be data, may be functions, or may be both data and functions; for the case where the component is a data and function, the representation component is also a digital twin.
2. The digital twin is named in a set mode, the components contained in the digital twin are uniquely named based on the component ID, and the components belonging to the same digital twin are stored on different nodes or servers in a network in a distributed mode or are stored in the same physical position in a centralized mode.
In order to more clearly show the novel technical scheme and the technical effects, the three parts of digital twinning expression form, digital twinning organization form and digital twinning naming and calling are described below.
1. Digital twinned representation.
In order to accurately characterize a digital twin, it is necessary to design the digital twin with a data structure having generic features, normalized, multi-key indexes. In the embodiment of the invention, referring to the idea of Class (Class) in an Object-oriented programming language, each Class of digital twin can also be regarded as a Class, and each digital twin instance is an Object (Object) generated by the Class, and in the digital twin Class, members of the digital twin Class include some data and some functions (components), and even other digital twin classes can also be included.
In the embodiment of the invention, the twin body individual and the components to which the twin body individual belongs are uniquely named based on the component ID, and corresponding verification data is generated by a system for each component for integrity verification. The verification data is a hash value calculated according to the data content of the component, and the hash value and the data content of the component form a component structure together; the data content of the component is the content contained in the component, for example, when the component comprises data, the data content is corresponding data; when the component comprises a function, the data content of the component is the corresponding function; when the component comprises data and functions, the data content is the corresponding data and functions.
Considering the external access rights of each member in the digital twinning, in the embodiment of the present invention, the component attributes in the twinning volume data structure are classified into Private attributes (Private), public attributes (Public) and protected attributes (protection).
As shown in fig. 2, the private attribute is determined by the specific type of the digital twin, and the private attribute contains the private information of the digital twin, and only the private information passes through the individual and has access rights, so that the private attribute is the data for privacy comparison; taking a vehicle as an example, when a digital twin is constructed, the private attributes of the components include: vehicle data, available services, connection attributes, etc. The public attribute is an attribute owned by all the digital twin, comprises the use information of the digital twin in a network, and takes a vehicle as an example, and comprises the following steps: owners, use cases, basic information, etc.; any external module or component can be accessed, being digital twins capable of externally disclosed information that characterizes and characterizes their own identity, including a description of the access interface. The protected attribute serves the inheritance of the digital twins, allowing access by owners or other digital twins having inheritance, making the iterative upgrade of twins more convenient, taking vehicles as an example, the protected attribute includes: part verification code, partial database, etc.
As previously described, the digital twin class may include other digital twin classes, that is, allowing the digital twin to set other twin as the owner in the creation process, forming a dependency relationship, and as the nature of the class, the digital twin may be nested, and a component in a twin may also be in the form of a digital twin (i.e., where the component described above includes data and functions); or based on a class, digital twins of similar attribute classes are generated in batch in an inheritance manner (as will be described in the following with respect to examples).
In addition, in order to better represent the attribute of the physical entity in the network information system, accurately describe the relationship between the components contained in the physical entity, if the matching relationship exists between the physical entities corresponding to the components in the process of modeling the digital twin, the description representing the connection relationship and the connection attribute between different components is added and exists as a component form of the digital twin. Specifically, the embodiment of the invention designs the data of the twin body, which represents the connection relation description data and expresses the connection relation and the connection attribute among different component modules of the twin body. Taking a vehicle as an example, components to which a digital twin of the vehicle belongs include an engine, a tire, a wheel axle, and the like, depending on the connection of the components contained in the physical entity. As the matched components exist in the driving process, the connection of the components is also required to be considered in the twin network, and the connection attribute between the components can be described to the network information system along with the connection relation description data of each component, so that the stability of the connection is ensured.
2. Digital twinned organization.
As described above, the data and functions belonging to the same digital twin are stored in a distributed form on different nodes or servers in the network, or stored in a centralized form on the same physical location locally, and can be accessed when required, as shown in fig. 3, and the form of storing the relevant components in the network is given as an example of a vehicle. In addition, the function to which the twin belongs has two expression states, namely a static code state and an awake state, namely: can be stored in the form of static codes and awakened to run when needed; when awakened, typically runs in memory, an interface is provided so that the visitor can call the function to obtain the result.
In order to support flexible query and modification of twin data content, in the embodiment of the invention, a Merkle tree (specifically, a storage structure constructed by using named keywords) is constructed by using a digital twin name and a component ID, each component of the digital twin is used as a leaf node, and verification data of the component is used as a hash value on the leaf node, so that hash values of each middle layer and root node are calculated. The naming system which is assisted by adopting the Merkle tree structure is adopted, on one hand, the interface calling difficulty is ensured to be low, and the representation difficulty is low; on the other hand, the security of the twin volume data is ensured, and the security verification capability is provided.
When the digital twin actively performs data content updating operation, based on a Merkle tree mechanism, the hash value is updated and checked layer by layer from the node at the updating position to the root node, and finally, the root node is authenticated once, which represents the completion of data content updating. Under the above flow, when unexpected or maliciously modified contents occur, the hash value is recalculated, but cannot pass authentication, and the error position can be easily checked.
As shown in fig. 4, when the hash value of a certain leaf node changes, a series of hash value changes will be caused in a chained manner until the hash value of the root node, and the security check module (which is arranged in the network layer and is a management module outside the digital twin body) can find out unexpected changes of the hash value of the root node, so that the most original change point is found layer by layer, and the data is recovered by backup and other modes.
3. Naming and calling modes of digital twinning.
In the embodiment of the invention, the digital twin body can be named based on the traditional hierarchical naming mode of the data structure, namely, the name is directly set during creation, other calculation operations are not performed, the direct calling and the judgment of the owner are facilitated, and the inheritance relationship is ensured. In addition, considering the demands of integrity and security services, although a uniquely generated check code is designed, only the check code is used as an accompanying special key word, a Merkle tree structure is built around the check code for storage, and the authentication and protection functions are completed.
In order to realize the calling of the digital twin body, a data table comprising the corresponding relation of the component Name, the component ID and the address is stored on a server, and the corresponding component ID and the address are inquired in the data table through the component Name so as to acquire corresponding data and/or call a corresponding function; wherein, the Name of the component is the Name of the corresponding component, including: the data Name and the function Name can be directly named by using the data and the function; specifically:
1) When the access requirement is generated on the data of the digital twin body, the data can be read directly or the related function is required to be called to obtain the data, then, the corresponding component ID (the component ID is queried to play a role in verification) and the address are queried in the data table according to the data Name or the function Name, and then, the access is completed through the address to obtain the corresponding data.
2) When a call demand is generated for a function to which the digital twin body belongs, the corresponding component ID and the address are queried in a data table through the function Name, and then the access call of the function is carried out through the address.
As shown in fig. 5, taking a vehicle as an example, an example of naming and partial component forms of the corresponding digital twin is given; the vehicle is directly named as Car, the data of the Car is Car.Owner, car.Length and the like, and functions such as car.light_control (), car.get_location () and the like are provided corresponding to the vehicle owner and the vehicle length and are respectively used for controlling the Car lights and acquiring the vehicle positions, so that the two types of data and the two types of functions are respectively used as a component and can be directly called to acquire the data of the physical entity vehicle corresponding to the digital twin or operate the physical entity vehicle; in addition, a part in the vehicle can also be in the form of a digital twin body, which has own belonged data and functions, for example, the engine of the vehicle can be a digital twin body, named car.Engine, which has data and functions such as Car.Engine.Code, car.Engine.Get _rotation_speed (), and the like, so as to support a user to directly call. It should be noted that fig. 5 only shows an example of some components, and the number and content of the specific components may be adjusted according to the actual situation.
For ease of understanding, a complete example is provided below, again taking the vehicle as an example.
In an automotive plant, a digital twin modeling is performed on a particular model (e.g., type 1) of a vehicle design, namely type 1 as a class, designated car_v1. Each produced type 1 vehicle is an object inherited from car_v1, namely the digital twin bodies of similar attribute types are generated in batches in an inherited mode, and the digital twin bodies generated in the mode are independent individuals and correspond to independent actual vehicle individuals. Some service parameters used inside the vehicle are assigned private attributes, such as size data of the own vehicle model, while basic public information of the vehicle is assigned public attributes, such as the owner of the vehicle.
Considering upgrade optimization of a vehicle design that may occur, for example, from car_v1 to car_v2, for some data that will not be changed in a vehicle model upgrade, it should be assigned a protection attribute for ease of access, which guarantees privacy as well as allows the existence of inherited relationships between type 1 and type 2 vehicles.
The data to which the vehicle belongs may be static, for example, vehicle size data, which may be recalled directly by Car.Length.data, car.Width.data. For dynamic data, such as real-time position of a vehicle, it cannot be stored in a frequently modified car location form (static data form) due to design requirements, but a car get location function is provided to acquire dynamic data in a static function.
For each component in the digital twin, a unique component ID, such as Car.Length.Hash, car.Get _location.Hash, is calculated and generated, root node values obtained by calculation after the hash values establish a Merkle tree are stored in a Car.root (the car.root is a component named Root in the twin Car, the content is the numerical value of the Root node of the Merkle tree), and whether the data change occurs can be known only by observing the car.root.
For some static data, such as vehicle mileage, where privacy authority settings exist, this is not directly published data, which is named car. The access of the data is also carried out through a function, and the return value is a mileage value by calling the Car.get_mill.function () function.
And on the network node, according to the stored ID-address corresponding table, the corresponding physical address can be queried through the component ID, so that the data access is realized, and the access to the twin-body content of the distributed storage is supported.
For components of the vehicle to which the digital twin body belongs, including an engine, a tire, a wheel axle and the like, there is a connection relationship between them in a physical entity, and a description of the connection relationship needs to be considered in a network. Connection attributes between components are represented in the network by connection relationship description data accompanying each component when considering connection of the components in the twin network, such as a car.
From the description of the above embodiments, it will be apparent to those skilled in the art that the above embodiments may be implemented in software, or may be implemented by means of software plus a necessary general hardware platform. With such understanding, the technical solutions of the foregoing embodiments may be embodied in a software product, where the software product may be stored in a nonvolatile storage medium (may be a CD-ROM, a U-disk, a mobile hard disk, etc.), and include several instructions for causing a computer device (may be a personal computer, a server, or a network device, etc.) to perform the methods of the embodiments of the present invention.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (5)
1. A method of digital twinning representation and naming, comprising:
modeling different classes of physical entities separately as digital twins, each digital twins comprising a number of components, each component comprising: data and/or functions; the data are description data and/or state data of the corresponding physical entity, and the function is a service or physical characteristic which can be provided by the corresponding physical entity;
the digital twin is named in a setting mode, the components contained in the digital twin are uniquely named based on the component ID, and the components belonging to the same digital twin are stored on different nodes or servers in a network in a distributed mode or are stored in the same physical position in a centralized mode;
the attributes of the component include: private properties, public properties, and protected properties; wherein the private attribute is determined by the specific type of the digital twin and comprises private information of the digital twin; the public attribute is an attribute owned by all digital twins, comprises the use information of the digital twins in a network, can be accessed by any external module or component, and is the information which can express the identity and the characteristics of the digital twins and is externally disclosed, and comprises the description of an access interface; the protected attribute serves the inheritance of the digital twins, allowing access to the owner or other digital twins having inheritance;
constructing a Merkle tree by using the naming of the digital twin and the ID of the component as a storage structure of the digital twin, taking each component of the digital twin as a leaf node, taking the verification data of the component as a hash value on the leaf node, wherein the verification data is a hash value calculated according to the data content of the component, and forming a component structure together with the data content of the component;
storing a data table comprising the corresponding relation of the component Name, the component ID and the address on the server, and inquiring the corresponding component ID and the address in the data table through the component Name to acquire corresponding data and/or call a corresponding function; wherein, the Name of the component is the Name of the corresponding component, including: data Name and function Name.
2. The method for representing and naming a digital twin according to claim 1, wherein in the process of modeling the digital twin, if there is a matching relationship between physical entities corresponding to components, descriptions representing connection relationships and connection attributes between different components are added.
3. The method for representing and naming a digital twin according to claim 1, wherein when the digital twin actively performs the data content update operation, the hash value is updated and checked layer by layer from the update node to the root node based on the Merkle tree mechanism, and finally the root node is authenticated once, which represents the completion of the data content update.
4. A method of digital twin representation and naming of claim 1 wherein naming a digital twin in a set manner comprises: the digital twin is named using a traditional hierarchical naming scheme based on the data structure itself.
5. A method of digital twin representation and naming of claim 1, wherein the querying the data table for the corresponding component ID and address via the component naming Name comprises:
when the access requirement is generated on the data of the digital twin body, judging that the data can be directly read or the related function is required to be called for acquisition, then inquiring the corresponding component ID and address in a data table according to the data Name or the function Name, and then completing access through the address to acquire the corresponding data;
when a call demand is generated for a function to which the digital twin body belongs, the corresponding component ID and the address are queried in a data table through the function Name, and then the access call of the function is carried out through the address.
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| CN115270213B (en) * | 2022-06-30 | 2024-03-01 | 北京亚控科技发展有限公司 | Twinning method, subscribing method and system for current state of entity |
| KR102677211B1 (en) * | 2022-08-03 | 2024-06-24 | 건국대학교 산학협력단 | A method of generating digital things based on abstract digital thing class in a digital twin system |
| CN115083535B (en) * | 2022-08-23 | 2022-11-08 | 佰墨思(成都)数字技术有限公司 | Configuration digital twin construction method and system for biological pharmaceutical workshop |
| CN118114421A (en) * | 2022-11-29 | 2024-05-31 | 顺丰科技有限公司 | Digital twin model construction method, device, equipment and medium for multi-logistics scene |
| CN115982700B (en) * | 2023-03-21 | 2023-06-23 | 北京快成科技有限公司 | Digital twin system authority control method and system |
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