CN102662681A - Distributed simulation general supporting platform based on high level architecture (HLA) and implementation method thereof - Google Patents
Distributed simulation general supporting platform based on high level architecture (HLA) and implementation method thereof Download PDFInfo
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Abstract
The invention discloses a distributed simulation general supporting platform based on high level architecture (HLA) and an implementation method thereof. The distributed simulation general supporting platform and the implementation method of the distributed simulation general supporting platform are designed for solving the problem that an existing real-time interface (RTI) is complicated in application. The distributed simulation general supporting platform based on the HLA comprises an RTI gateway unit with a layered distribution structure, an RTI local process unit and an interface function library unit, achieves simulation federal management service, simulation member statement management service, simulation object management service, simulation time management service, ownership management service, data distribution management service, auxiliary operation supporting service, and cooperates with simulation operation monitoring tools. The distributed simulation general supporting platform based on the HLA and the implementation method of the distributed simulation general supporting platform effectively reduce network data stream and facilitate control and coordination of global data. Users can achieve HLA standard interface service easily by calling federal ambassador classes and federal member ambassador classes. The distributed simulation implementation method based on the HLA is reasonable in process, and improves simulation information transferring speed.
Description
Technical Field
The invention relates to a distributed simulation universal supporting platform based on HLA (high level architecture) and an implementation method thereof, belonging to the technical field of computer simulation.
Background
With the rapid development of computer and information technologies, computer simulation technologies are gradually attracting attention, and are widely applied to the fields of aerospace, aviation, manufacturing, transportation, energy and the like. Meanwhile, the problems faced by computer simulation are more and more complex, a single simulation system cannot meet the requirements often, and distributed simulation becomes a main development direction in the field of computational simulation.
The HLA (High Level Architecture) is a factual standard of the present distributed simulation, the interoperation among all simulation members can be realized by using a standard specification, a Runtime Infrastructure (RTI) and an object model template, and a simulation environment unrelated to the geographical position is provided for the distributed simulation, so that the complexity of the distributed simulation development is reduced, and the interoperability, the portability and the code reusability are improved.
The wide area network operation, the multi-layer federal integrated mode and the dynamic reuse of simulation resources are the main problems in the current complex product collaborative design and simulation further development, and the current HLA-based simulation support environment cannot meet the requirement of higher degree.
Disclosure of Invention
In order to overcome the defects, the invention provides an HLA-based distributed simulation universal support platform enabling federates to flexibly join in simulation execution and an implementation method thereof.
In order to achieve the above object, in one aspect, the present invention provides a distributed simulation universal support platform based on HLA, which adopts a layered distributed structure and includes an RTI local process unit, an RTI gateway unit, and an interface function library unit, which are connected in sequence, wherein the interface function library unit is connected to a federate; wherein,
the RTI gateway unit is used for carrying out communication initialization on the member of the federated platform;
the RTI local process unit monitors requests from the federate and the RTI server;
the interface function library unit is used for providing various service requests of the HLA for the federate;
the support platform implements the following services according to the interface specification of HLA (high level architecture):
simulating federal management service to complete the execution of creation, dynamic control, modification and deletion of federal;
the simulation member declaration management service is used for a virtual experiment, wherein each member participating in federal execution is required to declare the data content required to be generated and/or the received data content to the collaborative simulation operation interoperation support system by a virtual experiment;
a set of services handles the registration, modification, deletion and sending and receiving of attributes/interactions of objects that convey object state information or events by sending attribute updates or interactions;
the simulation time management service is used for controlling the propulsion of each member on a simulation time axis, so that the cooperative simulation operation interoperation support system can forward the events from the members to the corresponding members according to the propulsion time, mode and sequence of the federal members set by the support system;
the ownership management service is responsible for transferring ownership of object instance attributes among the federates, and the transfer is used for supporting collaborative modeling of the federates;
the data distribution management service realizes the reduction of unnecessary consumption of transmitting and receiving irrelevant data provided by the federate.
In particular, the simulation member declaration management service provides information about the relevant data at the granularity of class attributes, and the data distribution management service refines data constraints, constrained from the granularity of instance attributes.
In particular, the services provided by the support platform further comprise:
the auxiliary operation support service is used for describing services which can be used by the members participating in the federation and comprise name and handle conversion, setting of various switches, operation domain related services and RTI starting termination;
and the collaborative simulation operation monitoring tool provides the state of the simulation federation in the simulation operation process.
In particular, standard services and interfaces defined by the HLA interface specification are implemented using the C + + language, developed in accordance with the HLA interface specification IEEE 1516.
In another aspect, the present invention provides a method for implementing distributed simulation based on HLA, including the following steps:
starting an RTI gateway process, managing the creation and destruction of the federation and data interaction in the execution process of the federation;
each federal member is initialized through communication with RTIGate and added into the corresponding federal;
when a federate starts to join the federate, the RTIAmb process is automatically started in the background and automatically monitors requests from member programs and an RTI server;
the libRTI provides various service requests of the HLA to the federate through the RTIAmb, and the federate process submits the requests to the RTIAmb through a local socket;
and the RTIGate receives and processes the request sent by the RTIAmb, and then informs the corresponding RTIAmb of the federate of the message for the federate to perform simulation application.
Particularly, the federate calls RTI service to communicate with RTIAmb through libRTI, and the communication means adopts Windows TCP Socket.
The HLA-based distributed simulation universal support platform consists of RTIAmb, RTIGate and libRTI, effectively reduces the data flow of the network, and facilitates the control and coordination of global data. The invention adopts standard C + + to compile, and the user can realize HLA standard interface service easily by calling the federal messenger class and the federal member messenger class.
The distributed simulation implementation method based on the HLA has reasonable flow and improves the information transmission speed of the simulation.
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Fig. 1 is a constitutional structural view of a preferred embodiment of the present invention.
Fig. 2 is a schematic diagram of the cooperation of RTIAmb service invocation in the preferred embodiment shown in fig. 1.
Detailed Description
The invention is described in detail below with reference to the drawings and examples.
The first preferred embodiment: as shown in fig. 1, the preferred embodiment of the HLA-based distributed simulation universal support platform of the present invention implements 6 major HLA management services and assisted operation services according to the standard specification of IEEE 1516.
Federal management is one of the six regulatory functions of RTI and is also a problem that HLA-based programming must first face. Federal management mainly includes the following tasks: the federation executes the life cycle process (creating federation execution, adding federation members into federation execution, quitting federation execution and withdrawing federation execution), manages federation-wide synchronization points, realizes federation-wide preservation and recovery, and the like.
Claim management is the basis for RTI data management. The declaration management mainly includes publishing, subscribing, and supporting control functions. In HLA, each federate must publish object classes and interaction classes that it plans to update, and subscribe to object classes and interaction classes that it is interested in.
Object management is performed on the basis of claim management. It includes registration and discovery of object instances, updating and reflection of object instance attributes, sending and receiving of interaction instances, etc. And the method also comprises some additional object control methods, such as changing the updating of the property values of the instances and the transmission mode of the interaction instances, managing the appropriateness suggestions of the updating of the property values of the instances, managing the appropriateness suggestions of the property ranges of the instances, and the like.
Time management is one of the core contents of RTI, and during the operation of the federation, a user can dynamically change the time management strategy of a federation member through an RTI service. Time management includes the setting of time policies, management of time advancement and some corresponding ancillary services.
Ownership management is based on claim management and object management. The object of ownership management is ownership of an instance in the federal execution, and only federal members who have ownership of the instance attribute can be authorized to update the value of the instance attribute, so that the ownership management can be utilized to support collaborative modeling among the federal management members. Ownership management includes "push" mode, "pull" mode and some ancillary services, depending on the ownership transfer initiator. In the push mode, the federal member initiating the ownership transfer actively requires to "transfer" the ownership of part of the instance attribute owned by the member; in the "pull" mode, the federate initiating the ownership transfer then actively asks to "acquire" its designated instance property ownership.
Data distribution management provides a flexible data filtering mechanism, so that federal members can further reduce the publishing and ordering requirements, thereby effectively expanding the data distribution capability of the RTI. The data distribution management comprises creation, modification and deletion of areas and related services of the areas.
Besides 6 large management services, the auxiliary operation support tool service provides federal state for the simulation personnel, so that the user can conveniently monitor the operation, and the safe and controllable operation of the system is ensured. Simulating the state of the federation specifically comprises: the method comprises the following steps of simulating federation basic information (including names, handles, the number of federates and the like of the federation), simulating federation member basic information (including names, sentence handle values and the like of the federation members), FOM information (including all defined object classes and interaction class information), logic time pushing information of all federation members, interaction information in the running process of the federation (including publishing and subscribing of the federation members, and object instance attributes and interaction instances interacted in user simulation), configuration information and the like.
The distributed simulation general supporting platform based on the HLA mainly comprises three parts: an RTI local process unit (RTIAmb), an RTI gateway unit (RTIGate), and an interface function library unit (libRTI).
The libRTI is a C + + library that provides the federate developer with a series of services defined by the HLA interface specification. The members call RTI service to communicate with RTIAmb through libRTI, and the communication means adopts Windows TCP Socket. The HLA interface specification determines the services provided by the libRTI to federal members and the responsibilities each member should assume with the federal. Within the libRTI, an RTI Dart class (RTI:: RTIAMBassador) encapsulates the services provided by the RTI (i.e., the interfaces required by federal members to communicate with the RTI are defined and implemented), and all requests for the RTI by federal members are implemented in a method of calling the function of the RTI Dart class. The Member big fly class (RTI:: FederateAmbasgador), which is also part of libRTI, is an abstract class that defines the callback functions each federate member must provide (i.e., the interfaces to communicate with federate members that are needed to define and implement the RTI) that are used by RTI callbacks. Each federator must implement functions declared in the member's grand class according to the specific simulation application, and through libRTI, the federator executes requests of asynchronous response members.
Each federate needs to communicate with the RTI server locally through an RTIAmb process, and the RTIAmb process is automatically started in the background and automatically monitors requests from member programs and the RTI server when a federate starts to join the federate.
RTIAmb is the main functional component of the present invention, located between federal members and RTIGate, and monitors and manages message passing between them. The participation and the withdrawal of the federates are managed, and the support of data communication and coordinated operation is provided for the federates. Each federate needs to communicate with the RTI server locally through an RTIAmb process, and the RTIAmb process is automatically started in the background and automatically monitors requests from member programs and the RTI server when a federate starts to join the federate.
RTIAmb realizes six types of services of federal management, statement management, object management, ownership management, time management and data distribution management in HLA interface specification, processes and filters requests and interactive data of the members of the federation, and sends the requests to a server RTIGate through network link.
The Communications class abstracts and encapsulates various ways of communication between RTIAmb and federal members, RTIGate. And derives specific communication link objects such as TCPSocket, UDPSocket, SecureTCPSocket and the like to support different link services.
The message queue classes refer mainly manage message Queues and maintain two message Queues: a message queue RO distributed on reception and a message queue TSO distributed on timestamp.
The RootObject class is a base class of HLA object classes, and is mainly used to reflect the SOM structure of the federate: including object class lists, object instances and interaction class lists, and routing spaces and areas associated therewith.
As shown in fig. 2, taking the declaration management service as an example, when RTIAmb receives a member request, it needs to call a service in class queue to enter a message queue, and when processing the member request, RTIAmb needs to call a corresponding service process, and sends the processed message to RTIGate by calling class Communications.
The RTIGate of the invention is a global process, is a central processing node of TH _ RTI and is used for maintaining the running state of the whole federation. Before the execution of the federation is run, the process is started first, and the main function is to manage the creation and destruction of the federation and the data interaction in the execution process of the federation, namely a federated object model FOM. Second, it can manage several different federates, third, some management of global data, such as time control management (LBTS management), also run on RTIGate. LBTS management and time management in RTIAmb together enable federal-wide time management. Each federal member is added to the corresponding federal by initiation of communication with the RTIGate.
The service call collaboration process of RTIGate is as follows: and the RTIGate receives the request sent by the RTIAmb, processes the request according to the type of the request, and then informs the message to a local RTI agent process RTIAmb of the federate needing to respond to the message, so as to reflect the message to the simulation application of the federate.
The RootObject class in RTIGate is the same structure as the RootObject class in RTIAmb, but it is a recorded federal object model FOM responsible for data interaction throughout the federal scope.
The distributed simulation general support platform based on HLA in the preferred embodiment is composed of RTIAmb, RTIGate and libRTI, thereby effectively reducing the data flow of the network and facilitating the control and coordination of global data. The invention adopts standard C + + to compile, and the user can realize HLA standard interface service easily by calling the federal messenger class and the federal member messenger class.
The second preferred embodiment: the distributed simulation universal supporting platform based on the HLA adopts a layered distributed structure and comprises an RTI gateway unit, an RTI local process unit and an interface function library unit which are sequentially connected, wherein the interface function library unit is connected with federal members. The method for realizing distributed simulation based on HLA comprises the following steps:
starting an RTI gateway process, managing the creation and destruction of the federation and data interaction in the execution process of the federation;
each federal member is initialized through communication with an RTI gateway unit and added into the corresponding federal;
when a federate starts to join the federate, an RTI local process can be automatically started in the background and automatically monitors requests from member programs and an RTI server;
the interface function library provides various service requests of the HLA to the federate through an RTI local process, and the federate process submits the requests to the RTI local process through a local socket;
and the RTI gateway receives and processes the request sent by the RTI local process, and then informs the corresponding RTI local process of the federate of the message for the federate to perform simulation application.
The federate calls RTI service to communicate with RTI local process through interface function library, and the communication means adopts Windows TCP Socket.
The distributed simulation implementation method based on the HLA in the preferred embodiment has reasonable flow and improves the information transmission speed of simulation.
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 also included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope defined by the claims.
Claims (6)
1. A distributed simulation universal supporting platform based on HLA is characterized in that the supporting platform adopts a layered distributed structure and comprises an RTI gateway unit, an RTI local process unit and an interface function library unit which are connected in sequence, wherein the interface function library unit is connected with a federal member; wherein,
the RTI gateway unit is used for carrying out communication initialization on the member of the federated platform;
the RTI local process unit monitors requests from the federate and the RTI server;
the interface function library unit is used for providing various service requests of the HLA for the federate;
the supporting platform realizes the following services according to the interface specification of HLA:
simulating federal management service to complete the execution of creation, dynamic control, modification and deletion of federal;
the simulation member declaration management service is used for a virtual experiment, wherein each member participating in federal execution is required to declare the data content required to be generated and/or the received data content to the collaborative simulation operation interoperation support system by a virtual experiment;
a set of services handles the registration, modification, deletion and sending and receiving of attributes/interactions of objects that convey object state information or events by sending attribute updates or interactions;
the simulation time management service is used for controlling the propulsion of each member on a simulation time axis, so that the cooperative simulation operation interoperation support system can forward the events from the members to the corresponding members according to the propulsion time, mode and sequence of the federal members set by the support system;
the ownership management service is responsible for transferring ownership of object instance attributes among the federates, and the transfer is used for supporting collaborative modeling of the federates;
the data distribution management service realizes the reduction of unnecessary consumption of transmitting and receiving irrelevant data provided by the federate.
2. The HLA-based distributed simulation universal support platform of claim 1, wherein: the simulation member declaration management service provides information of related data on the granularity of class attributes, and the data distribution management service refines data limitation conditions and performs constraint from the granularity of instance attributes.
3. The HLA-based distributed simulation universal support platform of claim 1, wherein the services implemented by the support platform further comprise:
the auxiliary operation support service is used for describing services which can be used by federates and comprises name and handle conversion, setting of various switches, operation domain related services and RTI starting termination;
and the collaborative simulation operation monitoring tool provides the state of the simulation federation in the simulation operation process.
4. The HLA-based distributed simulation universal support platform of claim 1, wherein: the support platform is developed according to an HLA interface specification IEEE1516, and standard services and interfaces defined by the HLA interface specification are realized by using C + + language.
5. A method for realizing distributed simulation based on HLA is characterized by comprising the following steps:
starting an RTI gateway process, managing the creation and destruction of the federation and data interaction in the execution process of the federation;
each federal member is initialized through communication with an RTI gateway unit and added into the corresponding federal;
when a federate starts to join the federate, an RTI local process can be automatically started in the background and automatically monitors requests from member programs and an RTI server;
the interface function library provides various service requests of the HLA to the federate through an RTI local process, and the federate process submits the requests to the RTI local process through a local socket;
and the RTI gateway receives and processes the request sent by the RTI local process, and then informs the corresponding RTI local process of the federate of the message for the federate to perform simulation application.
6. The method of claim 5, wherein the distributed HLA-based simulation comprises: and the federate calls RTI service to communicate with RTI local process through an interface function library, and the communication means adopts Windows TCP Socket.
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| CN112217664B (en) * | 2020-09-22 | 2023-05-02 | 江汉大学 | Distributed parallel simulation method, device and system based on autonomy |
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