Researches And Design Of The Communication And Cooperation Mechanism Of The Multi-Agent System Of The Space Simulation Resource Repository System

Space Simulation Resource Repository System (SSRRS) is the important part of the Space Mission Integrated Simulation System (SMISS), its task is to storage and to manage the kind of model and data of the SMISS to provide reusable resource for the exploitation and running of the simulation application, and to collect the relevant result. SSRRS adopts blocking idea to design the system, each simulation application block sets the relevant agent to achieve the integration of the system, and these agents constitute a Multi-Agent System (MAS).Every discuss, analysis and simulation application of SSRRS are all deployed with resource. Resource management of SSRRS not only needs the agents to manage the relevant module, but also needs the interaction among the agents to implement the highly efficient transmission and management, which is the more important. The key of implement of the interaction among the agents is to choice a appropriate agent communication mechanism. Because the character of Space Equipments Simulation Resource is distributed, diversiform and reusable, message based communication mechanism among the agents is adopted, and the message communication information flow and control flow based on the criterion of the KQML is defined. Message based agent communication mechanism is not limited by the simple order and response structure, conquers the limitation of the blackboard system, and fully incarnates the character of the agent-based manner of constructing the system, primely resolves the distribution and the complexity of the information resource and operation object.SSRRS is a distribute system. The every kind of simulation application which the resource repository supported is distributed, and the resource which the SSRRS managed is also distributed, and the distributed resource maybe is also isomerous. When each agent access the resource, the transmission bandwidth and time conflict will occur, if the conflict is not clear up, it certainly will generate bad result to resource access. So, bring in the cooperation mechanism in the SSRRS, and make use of the agents'cooperation to achieve the high efficiency management of the resource storage and access. After searching on the MAS cooperation mechanism, the SSRRS conforms to adopt the contract net based MAS cooperation mechanism, and establishes the agent system's contract net model contraposed the character of the simulation resource repository, and adopts the agent's capability list conception which includes the cooperation frequency and the minimum capability criterion two part of content. The improved contract net cooperation mechanism, make the resource access more reasonable and ordered.