سلسله مراتب چند عاملی مدل های شبیه سازی مبتنی بر هواپیمای حامل پرتاب منجنیق
|کد مقاله||سال انتشار||تعداد صفحات مقاله انگلیسی||ترجمه فارسی|
|9426||2008||9 صفحه PDF||سفارش دهید|
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Publisher : Elsevier - Science Direct (الزویر - ساینس دایرکت)
Journal : Chinese Journal of Aeronautics, Volume 21, Issue 3, June 2008, Pages 223–231
With the aid of multi-agent based modeling approach to complex systems, the hierarchy simulation models of carrier-based aircraft catapult launch are developed. Ocean, carrier, aircraft, and atmosphere are treated as aggregation agents, the detailed components like catapult, landing gears, and disturbances are considered as meta-agents, which belong to their aggregation agent. Thus, the model with two layers is formed i.e. the aggregation agent layer and the meta-agent layer. The information communication among all agents is described. The meta-agents within one aggregation agent communicate with each other directly by information sharing, but the meta-agents, which belong to different aggregation agents exchange their information through the aggregation layer first, and then perceive it from the sharing environment, that is the aggregation agent. Thus, not only the hierarchy model is built, but also the environment perceived by each agent is specified. Meanwhile, the problem of balancing the independency of agent and the resource consumption brought by real-time communication within multi-agent system (MAS) is resolved. Each agent involved in carrier-based aircraft catapult launch is depicted, with considering the interaction within disturbed atmospheric environment and multiple motion bodies including carrier, aircraft, and landing gears. The models of reactive agents among them are derived based on tensors, and the perceived messages and inner frameworks of each agent are characterized. Finally, some results of a simulation instance are given. The simulation and modeling of dynamic system based on multi-agent system is of benefit to express physical concepts and logical hierarchy clearly and precisely. The system model can easily draw in kinds of other agents to achieve a precise simulation of more complex system. This modeling technique makes the complex integral dynamic equations of multibodies decompose into parallel operations of single agent, and it is convenient to expand, maintain, and reuse the program codes.
Carrier-based aircraft catapult launch is a complex system that involves multiple disciplines. The dynamics process of launching customarily consists of the movements of ocean, carrier, aircraft, atmosphere, and all their interactions. In addition, italso involves man-machine cooperation if considering the effects of pilot and/or commander. Concretely, the deck motion, catapult power, and ground effect of deck are related to carrier; the stroke of landing gear, power of engines, and pilot handling are related to aircraft; the special wind disturbance is related to the atmosphere[1-3]. Therefore, the catapult launch of carrier-based aircraft is a typical dynamics process of multibody with different inherent frequencies. Deck motion, characteristic oflanding gear, power of engine, and wind disturbance mainly have effects on the process. A large effort in calculation is generally needed for the dynamic system simulation of multibody that is usually with high orders, and is difficult to be expanded or to be separated for parallel computing[ 4-7]. With the development of computer technology, the bottleneck of data commutation is getting through. It is necessary now to choose an appropriate simulation modeling approach for designing a computation framework, so as to resolve these kinds of problems much easier.
نتیجه گیری انگلیسی
The simulation and modeling of dynamics system based on MAS is of benefit to study the multidisciplinary intersection problems. The physical concept can be clearly defined and the logical hierarchy is more explicitly precise. The system model includes all reactive agents of motion entities; in particular, it can easily draw in kinds of deliberative agents of intelligent systems to achieve a precise simulation of more complex system. For instance the pilots or commanders coupled in the system, measuring and control modules with random disturbances and noises. As viewed from the computer simulation, the multi-agent hierarchy modeling approach is advantageous to resolve the problems of carrier aircraft takeoff. The definition of agents and environments and their communications are precise and explicit. Compared with traditional techniques, this modeling technique makes the complex integral dynamics equations of multibodies decompose into parallel operations of single agent, and it is convenient to expand and maintain the simulation and easy to reuse the program codes. Furthermore, these codes can be abbreviated with the use of tensors, and by adding some self-checking codes into each agent the simulation can be verified and validated more easily.