CN113806940A - Method for representing and naming a number twin - Google Patents
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Abstract
The invention discloses a novel digital twin representation and naming method, which models different physical entities into digital twin bodies respectively, wherein each digital twin body comprises a plurality of components, and each component comprises: data and/or functions; the data is description data and/or state data of the corresponding physical entity, and the function is the service or physical characteristic which can be provided by the corresponding physical entity; the digital twins are named in a set mode, all components contained in the digital twins are uniquely named based on component IDs, and the components belonging to the same digital twins are stored in 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 twins and the relationship among the digital twins, 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 method for representing and naming a digital twin.
Background
With the fact that a large number of intelligent agents with sensing, reasoning, executing and other capabilities gradually become human production and living factors, interaction and cooperation among the intelligent agents, people and the intelligent agents are frequent, virtual spaces and physical spaces are increasingly interactively fused, and a network is changed from traditional information transmission to novel intelligent agent information service providing human, machine and object fusion. However, the existing network space and physical space are separated, and the efficiency in forming intelligent agent closed-loop information service of information transmission, intelligent decision and online control is low. At present, the problems that the digitization and the intelligent expression of a physical entity are difficult to support, the requirement of cross-space efficient intelligent information service is difficult to meet and the like exist.
In order to better realize novel applications such as unmanned driving, intelligent manufacturing and the like, deep interaction and fusion of a physical space and a network space are required. The digital twin is a simulation process integrating multidisciplinary, multi-physical quantity, multi-scale and multi-probability by fully utilizing data such as a physical model, sensor updating, operation history and the like, and mapping is completed in a virtual space, so that the full life cycle process of corresponding entity equipment is reflected. By constructing an interactive loop between the physical space and the digital space, the comprehensive, real-time and accurate digital representation of the physical entity is realized, and the digital twin can achieve the copy and interaction of the physical entity in the virtual space. The information transmission efficiency between a physical space and a network space can be greatly improved through a digital twin technology, and the efficient integration, organization and scheduling of various resources in different scenes are realized, so that the deep cooperative cooperation between the reality and the virtuality is realized, and the task execution efficiency is improved.
The digital twinning technology is an excellent idea for showing the virtual-real space cooperation possibility, but when the existing digital twinning implementation technology is introduced into a network space, the representation and naming system is not clear enough, the hierarchical relationship cannot be well shown, the deep cooperative cooperation between the virtual and real can not be effectively realized, and the task execution efficiency also needs 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 twins and the relation between digital twin components, more accurately reflect the real situation of a physical space and better integrate the resources of an actual scene.
The purpose of the invention is realized by the following technical scheme:
a method of representing and naming a twin of numbers, comprising:
modeling different classes of physical entities as digital twins respectively, each digital twins comprising a number of components, each component comprising: data and/or functions; the data is description data and/or state data of the corresponding physical entity, and the function is the service or physical characteristic which can be provided by the corresponding physical entity;
the digital twins are named in a set mode, all components contained in the digital twins are uniquely named based on component IDs, and the components belonging to the same digital twins are stored in 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 representation form storage structure is clear, the nesting of the digital twin is supported, an interface convenient to call is provided, the relevant information of the digital twin can be easily checked, the service function provided by the digital twin is used, a foundation is established for the call requirement of upper-layer service, the twin component supports centralized and distributed storage, the twin component is suitable for a flexible existence form in a network, and the twin is convenient to store in the network; on the other hand, the resources of the actual scene can be better integrated, and the task execution efficiency is guaranteed.
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In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a flow chart of a method for representing and naming a digital twin according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating component attributes provided by an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating different components of a digital twin body flexibly stored or operated at different physical locations in a network according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of the representation of the error generated in the Merkle tree structure according to the embodiment of the present invention;
fig. 5 is a schematic diagram of a partial digital twin assembly form of a vehicle individual according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
In order to smoothly introduce the digital twin of the physical entity into the network space and realize the information application of the fusion type of the physical space and the network space, the embodiment of the invention provides a novel representation and naming method of the digital twin, and the representation form and naming mode of the digital twin in the network are designed, so that the digital twin in the network can be managed and called to support the service. 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 a designed service interface for different digital twins or other individuals in the network, allow the invocation of services facing the digital twin in the network, and further provide a service function support for the digital twin layer to the upper layer architecture.
The terms that may be used herein are first described as follows:
the term "and/or" means that either or both can be achieved, for example, X and/or Y means that both cases include "X" or "Y" as well as three cases including "X and Y".
The terms "comprising," "including," "containing," "having," or other similar terms of meaning should be construed as non-exclusive inclusions. For example: including a feature (e.g., material, component, ingredient, carrier, formulation, material, dimension, part, component, mechanism, device, process, procedure, method, reaction condition, processing condition, parameter, algorithm, signal, data, product, or article of manufacture), is to be construed as including not only the particular feature explicitly listed but also other features not explicitly listed as such which are known in the art.
The following describes a method for representing and naming the twin of numbers provided by the present invention in detail. Details which are not described in detail in the embodiments of the invention belong to the prior art which is known to the person skilled in the art. Those not specifically mentioned in the examples of the present invention were carried out according to the conventional conditions in the art or conditions suggested by the manufacturer.
As shown in fig. 1, a method for representing and naming a digital twin includes the steps of:
1. modeling different classes of physical entities as digital twins respectively, each digital twins comprising a number of components, each component comprising: data and/or functions; the data is description data and/or state data of the corresponding physical entity, and the function is the service or physical characteristic which can be provided by the corresponding physical entity.
In the embodiment of the invention, various physical entities are modeled as digital twins respectively, the digital twins are an expression form of the physical entities in a network space, and the digital twins in a 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. Therefore, to realize the existence of such digital twin in the network information system, relevant data structures are designed and relevant naming systems are established.
As mentioned above, a component may be data or a function, and may of course be data and a function; for the case where the component is a data and function, the representation component is also a digital twin.
2. The digital twins are named in a set mode, all components contained in the digital twins are uniquely named based on component IDs, and the components belonging to the same digital twins are stored in 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 thereof, the following description is made of three parts, namely a representation form of the digital twin, an organization form of the digital twin and naming and calling of the digital twin.
First, the expression form of digital twin.
In order to accurately depict the digital twin, a data structure with universal characteristics, standardization and multi-keyword index needs to be designed for the digital twin. In the embodiment of the present invention, referring to the idea of Class (Class) in Object-oriented programming language, each Class of digital twin may also be regarded as a Class, and each instance of the digital twin is an Object (Object) generated by the Class, and in the digital twin Class, its members include some data and some functions (i.e. components), and may even include other digital twin classes.
In the embodiment of the invention, the twin individual and the component to which the twin individual belongs are uniquely named based on the component ID, and corresponding verification data is generated by a system aiming at each component and is used for integrity verification. The check 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; the data content of the component is the content contained in the component, for example, when the component includes data, the data content is the corresponding data; when the component comprises the function, the data content is the corresponding function; when the component includes data and functions, the data content is the corresponding data and functions.
In consideration of the access rights of each member of the digital twin to the outside, in the embodiment of the present invention, the component attributes in the twin data structure are divided into a Private attribute (Private), a Public attribute (Public), and a protected attribute (protected).
As shown in fig. 2, the private attributes are determined by specific types of digital twins, include private information of the digital twins, and are data with privacy, which only have access right by the individuals themselves; taking a vehicle as an example, when constructing a digital twin, the private attributes of the components include: vehicle data, available services, connection attributes, etc. The public attribute is an attribute owned by all digital twins and contains use information of the digital twins in the network, and taking a vehicle as an example, the public attribute comprises: owner, use case, basic information, etc.; any external module or component can access, is a digital twin that can expose information representing its identity and features, including a description of the access interface, to external disclosure. The protected attributes serve the inheritance relationship of the digital twin, allow an owner or other digital twins with inheritance relationships to access, and make the iterative upgrade of the twins more convenient, taking a vehicle as an example, the protected attributes include: part validation code, partial database, etc.
As mentioned above, the digital twin class may include other digital twin classes, that is, the digital twin is allowed to set other twin as the owner during the creation process, forming a dependency relationship, and the digital twin is nestable, and a component in a twin may also be in a digital twin form (i.e., the above-mentioned case where the component includes data and a function); or generating digital twins of similar attribute categories in a batch manner in an inheritance manner based on a class (as described in the following relevant examples).
In addition, in order to better represent the attributes of physical entities in a network information system and accurately describe the relationship among the components contained in the physical entities, in the process of modeling the digital twin, if the physical entities corresponding to the components have a matching relationship, descriptions representing the connection relationship and the connection attribute among different components are added and exist as one component form of the digital twin. Specifically, the embodiment of the invention designs twin belonging data which represent connection relation description data and express the connection relation and connection attribute between different component modules of the twin. Taking a vehicle as an example, the components of the digital twin of the vehicle include an engine, a tire, a wheel axle, and the like according to the connection condition of the components included in the physical entity. The connection of the components is also required to be considered in the twin network as the components which are matched in the driving process, and the connection attribute between the components can be explained to a network information system along with the connection relation description data of each component, so that the stability of the connection is ensured.
And II, a digital twin tissue form.
As mentioned above, the data and functions belonging to the same digital twin are stored in a distributed manner in different nodes or servers in the network, or stored in a centralized manner in the same physical location in the local, and can be accessed when required, as shown in fig. 3, which shows the storage form of the relevant components in the network by taking a vehicle as an example. In addition, the twin belongs to a function with two performance states, namely a static code state and an awakening state: the storage can be in a static code form, and the storage is awakened to run when needed; when awakened, typically running in memory, an interface is provided to allow the visitor to call functions to obtain results.
In order to support flexible query and modification of twin data content, in the embodiment of the present invention, a Merkle tree (specifically, constructed by named keywords) is constructed by using digital twin naming and component IDs as a storage structure of a digital twin, each component of a digital twin is taken as a leaf node, and check data of the component is taken as a hash value on the leaf node, so as to calculate hash values of intermediate layers and a root node. A naming system established by the aid of a Merkle tree structure is adopted, so that on one hand, the interface calling difficulty is low, and the representation difficulty is low; on the other hand, the safety of twin data is guaranteed, and safety verification capability is provided.
When the digital twin body actively carries out data content updating operation, based on a Merkle tree mechanism, the hash value is renewed and checked layer by layer from an updating node to a root node, and finally, the root node is authenticated once to represent the completion of data content updating. Under the above flow, when the content modified accidentally or maliciously occurs, although the hash value is recalculated, the hash value cannot pass the 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 values will be changed until reaching the root node, and the security check module (which is a management module outside the digital twin and is arranged in the network layer) can find the unexpected change of the hash value of the root node, so as to find the most original change point layer by layer and restore data by means of backup or the like.
And thirdly, naming and calling modes of the number twin.
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 setting is directly carried out during the creation without other calculation operation, so that the judgment of direct calling and owner is facilitated, and the inheritance relationship is ensured. In addition, considering the requirements of integrity and security service, although a uniquely generated check code is designed, the check code is only used as an accompanying special key word, a Merkle tree structure is built around the check code for storage, and the function of authentication protection is completed.
In order to realize the calling of the digital twin body, a data table comprising the corresponding relation of the component naming Name, the component ID and the address is stored on the server, and the corresponding component ID and the address are inquired in the data table through the component naming Name to acquire corresponding data and/or call a corresponding function; the component naming Name is the Name of the corresponding component, and comprises the following steps: the data Name and the function Name can be named directly by using the data and the function; specifically, the method comprises the following steps:
1) when the access requirement is generated on the data to which the digital twin body belongs, the data is judged to be directly readable or a related function is called to obtain the data, then, according to the data Name or the function Name, a corresponding component ID (the component ID is mainly inquired to play a verification role) and an address are inquired in a data table, and then the access is completed through the address to obtain the corresponding data.
2) When a calling requirement is generated on a function to which the digital twin body belongs, the ID and the address of the corresponding component are inquired in the data table through the function Name, and then the function is accessed and called through the address.
As shown in fig. 5, taking a vehicle as an example, naming of the corresponding digital twin and an example of a partial component form are given; the vehicle is directly named as Car, the data of the Car comprises functions such as Car, light _ Control (), Car, get _ Location () and the like, the functions correspond to the owner of the vehicle and the length of the vehicle, the functions are used for controlling the vehicle lamp and obtaining the position of the vehicle, and therefore the two types of data and the two types of functions are respectively used as one component and can be directly called to obtain the data of the physical entity vehicle corresponding to the digital twin or operate the physical entity vehicle; in addition, a certain part in the vehicle may also be in the form of a digital twin body, and has its own data and functions, for example, an engine of the vehicle may be a digital twin body, which is named as car. It should be noted that fig. 5 only gives examples of some components, and the specific number and content of the components may be adjusted according to actual situations.
For ease of understanding, a complete example is provided below, again taking a vehicle as an example.
In automotive factories, a vehicle design of a particular model (e.g., type 1) is digitally twinned modeled, i.e., type 1 as a class, named Car _ v 1. Each type 1 vehicle produced is an object inherited from Car _ v1, that is, the aforementioned digital twins of similar attribute categories are generated in a batch in an inheritance manner, and the digital twins generated in this manner are independent individuals corresponding to independent actual vehicle individuals. Some service parameters used inside a vehicle are assigned to private attributes, such as size data of the own vehicle type, while the basic public intelligence of the vehicle is assigned to public attributes, such as the owner of the vehicle.
Considering that upgrade optimization of vehicle design, such as conversion from Car _ v1 to Car _ v2, may occur, for some data that is not subject to change in vehicle model upgrade, it is not appropriate for access convenience of proprietary attributes, so it should be assigned to Protect attributes, both to ensure privacy and to allow existence of inheritance relationship between type 1 and type 2 vehicles.
The data to which the vehicle belongs may be static, for example, the size data of the vehicle, which may be directly called by the car. For dynamic data, such as real-time position of a vehicle, due to design requirements, it cannot be stored in a frequently modified car location form (in the form of static data), but a car get location function is provided to obtain dynamic data in the form of 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, and a Root node value calculated after the hash values establish the Merkle tree is stored in car.root (car.root is a component of the twin Car with an item name of Root, and the content is the aforementioned numerical value of the Root node of the Merkle tree), and whether data changes can be known only by observing the car.root.
For some static data, such as vehicle mileage, where privacy authority settings exist, it is not directly public data, named car. The access of the data also needs to be performed through a function, and a car.get _ mileage.function () function is called, so that a numerical value with a return value of mileage can be obtained.
On the network node, according to the stored ID-address corresponding table, the corresponding physical address can be inquired through the component ID, thereby realizing the access of data and simultaneously supporting the access of the contents of the twin stored in a distributed manner.
For the components of the vehicle to which the digital twin belongs, including an engine, a tire, a wheel axle and the like, which have connection relationships in physical entities, the description of the connection relationships needs to be considered in the network. Therefore, when the connection of these components is considered in the twin network, the connection attribute between the components is represented in the network by the connection relationship description data accompanying each component, for example, in the form of car.
Through the above description of the embodiments, it is clear to those skilled in the art that the above embodiments can be implemented by software, and can also be implemented by software plus a necessary general hardware platform. With this understanding, the technical solutions of the embodiments can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a usb disk, a removable hard disk, etc.), and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods according to the embodiments of the present invention.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A method of representing and naming a digit twin, comprising:
modeling different classes of physical entities as digital twins respectively, each digital twins comprising a number of components, each component comprising: data and/or functions; the data is description data and/or state data of the corresponding physical entity, and the function is the service or physical characteristic which can be provided by the corresponding physical entity;
the digital twins are named in a set mode, all components contained in the digital twins are uniquely named based on component IDs, and the components belonging to the same digital twins are stored in different nodes or servers in a network in a distributed mode or are stored in the same physical position in a centralized mode.
2. A method of digital twin representation and naming according to claim 1, wherein the properties of the components include: private attributes, public attributes, and protected attributes;
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, contains use information of the digital twins in the network, can be accessed by any external module or component, and is information which can be disclosed externally and represents self identity and characteristics, including description of an access interface.
The protected attribute serves the inheritance relationship of the digital twin, allowing access to the owner or other digital twins having an inheritance relationship.
3. The method for representing and naming a digital twin as claimed in claim 1, wherein in the process of modeling the digital twin, if there is a matching relationship between the physical entities corresponding to the components, descriptions representing the connection relationship and connection attributes between different components are added.
4. The method according to claim 1, wherein a Merkle tree is constructed by using digital twin naming and component IDs as a storage structure of the digital twin, each component of the digital twin is used as a leaf node, check data of the component is used as a hash value on the leaf node, and the check data is a hash value calculated according to data content of the component and forms a component structure together with the data content of the component.
5. The method as claimed in claim 4, wherein when the digital twin actively performs the data content update operation, based on the Merkle tree mechanism, the hash value is updated and checked layer by layer from the update node to the root node, and finally the root node is authenticated once to represent the completion of the data content update.
6. The method according to claim 1 or 4, 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.
7. The method for representing and naming a digital twin as claimed in claim 1 or 4, wherein the server stores a data table including the correspondence between the component naming Name, the component ID and the address, and the component naming Name is used to query the corresponding component ID and address in the data table to obtain the corresponding data and/or call the corresponding function; the component naming Name is the Name of the corresponding component, and comprises the following steps: the data Name and the function Name.
8. The method of claim 7, wherein the querying the data table for the corresponding component ID and address by the component naming Name to obtain the corresponding data and/or calling the corresponding function comprises:
when an access requirement is generated on data to which a digital twin body belongs, judging whether the data can be directly read or a related function needs to be called to obtain the data, then inquiring a corresponding component ID and an address in a data table according to a data Name or a function Name, and completing access through the address to obtain corresponding data;
when a calling requirement is generated on a function to which the digital twin body belongs, the ID and the address of the corresponding component are inquired in the data table through the function Name, and then the function is accessed and called through the address.
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| CN115270213A (en) * | 2022-06-30 | 2022-11-01 | 北京亚控科技发展有限公司 | Twin method, subscription method and system for current state of entity |
| CN115982700A (en) * | 2023-03-21 | 2023-04-18 | 北京快成科技有限公司 | Digital twin system authority control method and system |
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| CN115083535A (en) * | 2022-08-23 | 2022-09-20 | 佰墨思(成都)数字技术有限公司 | Configuration digital twin construction method and system for biological pharmaceutical workshop |
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