Research On Distributed Simulation Technology Of Flexible Multi-level Combat System

With the development of computer network technology and the advent of DIS and HLA,distributed interactive simulation technology has been widely used in combat system research.In the course of combat,the architecture of the combat system presents a dynamic and multilayered feature due to the increase and decrease in warriors,combat loss and dynamic allocation of combat missions,especially the introduction of unmanned and intelligent technologies.However,distributed interactive simulation systems built upon traditional simulation tools are mostly flat structure systems.Namely,the simulation entities are regarded as members of the same hierarchy,which ignores the dynamic structural relationship between members and makes it difficult to intuitively meet the requirements of dynamic variable simulation structure.For this reason,this dissertation studies the modeling technology of flexible multi-level combat system with Warship-multi-UUV as the research object.The key technologies required by the corresponding simulation system,such as service-oriented flexible multi-level distributed simulation service architecture design,improved balanced binary search tree for dynamic service information,and basic service function of flexible multi-level distributed simulation,have been investigated.On this basis,the Warship-multi-UUV combat distributed interactive simulation system is constructed and analyzed.The main research results and creations are listed as below.(1)The development direction of flexibility of the combat system architecture is analyzed.The Warship-multi-UUV combat system was taken as the research object to describe the changes of combat architecture before and after dynamic task assignment in the combat process.Then,the simulation model of typical flexible multi-level combat system was built.Finally,the dynamic task assignment algorithm based on extending contract network protocols under constraint conditions was developed.(2)Aiming at the problem that the coupling relationship between federation members in the existing multi-level simulation support tools is too close,a flexible multi-level distributed interactive simulation service architecture,composed of federation management center and federation members,based on SOA connection is proposed and designed.The rules of flexibility change of architecture are given.A federation management center composed of flexible decision module,service registry module and service instance information management module are developed.Meanwhile,the federation member composed of data distribution module,service deployment module,autonomous module and data routing module was developed.In this way,the flexible multi-level distributed interactive simulation service architecture is designed with looser coupling relationship between federation members.(3)In order to overcome the time-consuming problem of balanced binary search tree construction in dynamic service information search,a fast balanced binary search tree construction method based on logical operation and binary coding is proposed after analyzing the properties of the binary tree constructed by logical operation.It shortens the construction time and improves the search efficiency of dynamic service information.The experiment shows that the new method takes 7% less time than the traditional ones under the condition of 100 nodes,takes 34% less time than the traditional ones under the condition of 1000 nodes,and thus improves the efficiency of simulation operation.(4)According to the functional requirements of flexible multi-level distributed interactive simulation services,the object model specification,multi-level architecture management function,improvement of declaration management,data filtering mechanism based on instance confirmation,distributed data distribution technology based on message-driven and agent communication language extension and other functions are studied.In the aspect of federation management,the management function of multi-level architecture is added.In terms of declaration management,the efficiency of data filtering based on class level is improved by increasing the scope attribute value of the object class.In the aspect of object management,a new data filtering mechanism based on instance confirmation is added,which further reduces the useless data in the simulation network.In terms of data distribution management,aiming at the problem that centralized data distribution is easily affected by communication bottleneck,a message-driven data distribution technology is proposed and designed.And in the aspect of communication language,the semantic-based communication function between agent members is extended.(5)According to the functional requirements of FMDIS,the three key technologies including multi-thread working mechanism,inter-process communication mechanism and data management mechanism and other are solved,and design of FMDIS software is completed.Aiming at the problem of complex and tedious modeling process,the 3d model assembly technology is proposed,and the 3d model assembly tool is designed and implemented.The development of 3d graphic display system is completed,both model-driven technology and interface technology are solved after establishing 3d model library.The ships-uuv distributed interactive simulation system based on FMDIS was constructed to complete the timeconsuming test of flexible hierarchy changes caused by the withdrawal of member ships and dynamic task assignment,which were 0.712 ms and 0.734 ms respectively,meeting the design requirements.The interactive simulation system of ship-uuvs distributed based on FMDIS is constructed.The time expended by changes of flexible hierarchy caused by the withdrawal of member ships and dynamic task assignment are 0.712 ms and 0.734 ms respectively in the context of our experiments,it meets the design requirements.A large integrated simulation system consisting of multi-ship,multi-aircraft and multi-sensor based on FMDIS software is developed.The results show that the system runs stably and can reproduce the changing process of the flexible architecture of the combat system,and the 3d graphic display effect is realistic,which shows the effectiveness and availability of the FMDIS studied in this paper.