Multi-agent Based Hierarchy Simulation Models of Carrier-based Aircraft Catapult Launch

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.

解读单元考点,牵手高频考题——Unit 14 Freedom fighters(英文)

1. Often blacks were not allowed intohotels, schools or libraries at all. (Page 28)【考点】allow的用法【归纳】allow 意为"允许, 准许"。用法有:allow sth. doing sth.allow sb. to do sth.allow sb. sth.allow for +n. (考虑, 顾及) / doing / obj.+

Modeling of Carrier-based Aircraft Ski Jump Take-off Based on Tensor

A general mathematical model of carrier-based aircraft ski jump take-off is derived based on tensor. The carrier, the aircraft body and the movable parts of the landing gears are treated as independent entities. These entities are assembled into a multi-rigid-body system with flexible links. Dynamical equations of each entity are derived on the basis of the Newton law and the Euler transformation. Using the invariance property of the tensor, the dynamical and kinematical equations are converted to tensor forms which are invariant under time-dependent coordinate transformations. Then the tensor-formed equations are expressed by the matrix operation. Differential equation group of the matrix form is formulated for the programming. The closure of the model is discussed, and the simulation results are given.

Guidance and Control Techniques of Carrier-Based Aircraft for Automatic Carrier Landing

We summarize the guidance and control techniques of automatic carrier landing for carrier-based aircraft.First,we analyze the carrier landing operations of the manned fixed-wing aircraft,unmanned fixed-wing aircraft and helicopters.Second,we look into the navigation and guidance system and the flight control methods for current different aircraft.Finally,we draw several conclusions of the development prospects for aircraft carrier landing,including the precision landing control techniques,precision approach and landing guidance techniques,and adaptive,reconfigurable and intelligent flight control techniques.

Parameter Optimization of Nose Landing Gear Considering Both Take-off and Landing Performance of Catapult Take-off Carrier-Based Aircraft

Optimization of the parameters of landing gear systems with double-stage air springs of catapult take-off carrier-based aircraft is here studied based on the mathematical equations of the classic dual mass spring-damper dynamic model.Certain standards for both take-off and landing performance are put forward.The contradictory factors between take-off and landing processes are analyzed.The optimization of oil in the pin area and the area near the rear oil hole is performed.Then these optimized parameters are used to assess the influence of the initial pressure of the low chamber,the ratio of the high chamber to the low chamber,and the tire inflation pressure on the performance of arresting landing and catapult take-off.The influences of these parameters on carrier-based aircraft and the aircraft-carrier on aircraft catapult take-off is also assessed.Based on the results of the simulation,respective take-off criteria must be drafted considering different types of aircraft and different take-off load cases,all of which must be matched to parameters relevant to catapult take-off.

Dynamics Analysis of Carrier-Based Aircraft with Off-Center Catapult Launch

In order to enhance the safety of the catapult launch of the carrier-based aircraft,the catapult launch multibody dynamic model is established aiming at the problem of off center catapult launch.The whole catapult process including four stages which are buffering,tensioning,releasing and taxiing is taken into consideration and the body dynamics of the off-center catapult during each stage is analyzed.The catapult launch dynamic differences between the conditions only considering taxiing and that considering four stages are compared,and the effects of the different initial off center distances considering four stages on the attitude,landing gear load and acceleration of the carrier based aircraft during catapult launch are discussed.The results show that only considering taxiing may underestimate the dynamics of the carrier-based aircraft substantially.When taking four stages into consideration,the initial off-center distance has small influence on the aircraft dynamic characteristics during buffering and tensioning but has larger influence on that during releasing and taxiing.The increase of the off-center distance will cause the enhancement of the aircraft rolling and yawing,which may lead to the load difference between the left and right landing gears and the increase of the aircraft lateral acceleration.The establishment and simulation of the catapult launch multi body dynamic model founded on buffering,tensioning,releasing and taxiing provide reference for the carrier-based aircraft design and analysis of the catapult launch dynamics.

DYNAMIC RESPONSE ANALYSIS OF CARRIER-BASED AIRCRAFT DURING LANDING

In view of the complexity of landing on the deck of aircraft carrier,a systematic model,composed of sixdegree-of-freedom mathematic model of carrier-based aircraft,four-degree-of-freedom model of landing gears and six-degree-of-freedom mathematic model of carrier,is established in the Matlab-Simulink environment,with damping function of landing gears and dynamic characteristics of tires being considered.The model,where the carrier movement is introduced,is applicable for any abnormal landing condition.Moreover,the equations of motion and relevant parameter are also derived.The dynamic response of aircraft is calculated via the variable step-size RungeKuta algorithm.The effect of attitude angles of aircraft and carrier movement during the process of landing is illustrated in details.The analytical results can provide some reference for carrier-based aircraft design and maintenance.

Optimal Preview Control for Automatic Carrier Landing System of Carrier-Based Aircraft with Air Wake

Carrier-based aircraft carrier landing is a special kind of tracking control problem and not suitable for classical control methods,which may miss the desired performance or result in overdesign.Therefore,we present an optimal preview control for automatic carrier landing system(ACLS)by using state information of system,as well as future reference information,which can avoid the shortcomings of classical control methods.Since the flight performance of carrier-based aircraft is disturbed by air wake when the aircraft flies near the area of carrier stern,we design a disturbance rejection strategy to ensure that aircraft track the glide path with high precision and robustness.Further,carrier-based aircraft is a complex nonlinear system.However,the nonlinear model of carrier-based aircraft can be linearized at equilibrium landing state and decoupled into the longitudinal model and the lateral model.Therefore,an optimal preview control system is designed.The simulation results of a carrier-based aircraft show that the optimal preview control system can effectively suppress air wake.Tracking accuracy of optimal preview controller is higher than that of the proportional integral differential(PID)control system.

Study on Data Acquisition and Storage Based on FPGA in Carrier-based Photoelectric Warning System

In order to capture and storage video data real-time for carrier-based photoelectric warning system, An acquisition and storage system based on FPGA is designed. To complete the asynchronous interface timing of the camera and the storage system, the video data which come from infrared camera and visible light camera is stored to FIFO by FPGA, and then four SDRAM as cache and ping-pong operation cache-data storage to the CF card, this structure not only takes advantage of high-speed reading and writing skills of CF card, but also to ensure the integrity of the video data. In the final experiment proved that the system can be effectively applied to ships the photoelectric warning scanning system, its performance fully meet the needs of practical application.

Unit 14 Freedom fighters课本要点精练(英文)

Ⅰ. 单词拼写。根据句意和汉语提示, 写出所缺单词的恰当形式。1. (奴隶制) is the system by whichsome people are owned by others.2. Fifty years ago, mixed-race marriages were(禁止)。

King Of Fighters 2000最强招式大曝光

最近电玩界最热门话题当然是《THE KOF FIGHTERS 2000》！虽然由街机移PC仍有一大段时间,不过对于游戏机发烧说,又怎能错过这个游戏。正因为新一集KOF快将推出,各位KOF的FANS不妨先多解这集的系统,才开始新一集的战斗吧！

Unit 14 Freedom fighters要点解读

一、词语例解1.prison n.1)监狱;牢房He is in prison now.That's why wehaven't seen him for months.他在坐牢,所以我们好几个月没见到他了。It was reported that four men escapedfrom prison yesterday.据报道。

The Fire Fighters Protecting The Potala Palace

The Potala Palace is situated on the"red"mountain of Lhasa.A group of police fire fighters, unknown to most people,are actually the"guardians of the national treasures"and are living all year around inside the Potala Palace.Seemingly they have formed a consolidated"fireproof wall"to protect this world famous cultural heritage.Since they took up residence 23 years ago, there have been no accidental fires in the palace.

“西安鲁迅”的多重面向与历史生成

文章综合运用日记、书信、手稿、回忆录、原始报刊史料及相关研究著述,对百年来有关“鲁迅在西安”的文献进行梳理和总结。从人的鲁迅、作家鲁迅、学者鲁迅、战士鲁迅等角度考察“西安鲁迅”的多重面向及其历史生成过程,揭示其背后所隐含的人际交往、时代语境、政治影响、学术变迁等复杂因素。通过对既往研究的清理与反思,指出研究者应从关注鲁迅与现实、地理空间的“西安”,延伸到历史、文化空间的“长安”,在学科的交叉融合中拓展相关研究的广度和深度。

战斗机飞行员腰椎退行性病变危险因素分析

目的探讨战斗机飞行员腰椎退行性病变的危险因素,提出针对性的预防及治疗方案。方法利用问卷调查方式结合脊柱影像学资料对相关飞行员进行评价,调查问卷内容包括一般资料、生活方式、飞行训练方式等暴露因素,脊柱影像学检查项目包括腰椎MRI和腰椎X线片。将存在腰椎退行性病变的飞行员纳入退变组,无腰椎退行性病变的飞行员纳入健康组,采用单因素分析和logistic回归模型进行腰椎退行性病变的危险因素筛选。结果纳入研究的战斗机飞行员腰椎退行性病变的整体患病率为45.8%(66/144)。战斗机飞行员发生腰椎退行性病变的危险因素分别为久坐(OR=2.714,95%CI 1.351~5.375,P=0.004)、缺乏腰背肌锻炼(OR=3.136,95%CI1.536~6.037,P=0.001)、飞行中静态姿势不适(OR=8.160,95%CI 3.152~21.120,P<0.001)、飞行中腰椎矢状位不正(OR=8.397,95%CI 3.367~20.942,P<0.001)、飞行中腰椎冠状位不正(OR=2.744,95%CI 1.102~6.831,P=0.030)。结论战斗机飞行员腰椎退行性病变患病率较高,飞行中持续的静态姿势不适和腰椎冠状位、矢状位失稳是腰椎退行性病变的重要诱因,减少久坐、加强腰背肌锻炼是避免腰椎退行性病变的重要方法。

集美大学脚斗士俱乐部发展的调查研究

为了探寻集美大学脚斗士项目的发展方向和对策,运用问卷调查、文献资料和数理统计等方法,从理论和实践的角度对集美大学脚斗士运动推广项目的发展进行了研究,分析出集美大学脚斗士运动推广过程中存在的问题,旨在为民族传统体育项目能够更好的传承和发展提供参考。结果表明:多数学生对脚斗士运动表示感兴趣,且认为有必要在学校开展脚斗士运动;集美大学脚斗士俱乐部成员都是在校学生,主要通过教练挑选和比赛筛选的方式产生;参与动机主要包括:参加比赛为学校争光、获得学分、对脚斗士运动感兴趣、健身,其中因为感兴趣参与的占多数。建议:加大宣传力度让更多人了解、支持脚斗士运动,提高教练员执教水平和裁判员执教水平,创造更多的比赛交流机会,加强科学选材工作和运动人才培养,重视科学训练。

当代美国拉美裔小说中的华人抗争者形象

当代美国拉美裔小说塑造了华人抗争者形象。加西亚的《猿猴之猎》通过互文性、文本与“副文本”和“潜文本”的互动,以及对“雌雄同体”概念的文学化利用,塑造了敢于反抗种族压迫和性别歧视的华人抗争者形象。迪亚斯的《奥斯卡·瓦奥短暂而奇妙的一生》以“讲述”和“呈现”相结合的方式,塑造了善良正直,勇于匡扶正义的华人抗争者形象。华人抗争者形象凸显拉美华人正直勇敢的精神品质,既折射了华人在特定历史时期拉美国家的生存经验和华人形象的多样性,又解构了美国白人文学中被动顺从华人刻板形象,对于建构正义勇敢的正面华人形象和国家形象具有重要参考意义。

TASK EFFECTIVENESS EVALUATION ON ANTI-SHIP ATTACK OF FIGHTER AIRCRAFT

The characteristics of the confrontation between fighters and air-defense systems on ship are analyzed. The approach of simulating operations of both sides is presented based on the combination of random-factor effectiveness simulation models and deterministic models. Two basic indices are proposed to indicate task effectiveness （i. e. the survival probability of the fighter team and the specified effect of damage on the fleet） and relative algo- rithms. To verify the approach, the situation that a fighter team attacks a collective defense fleet is exemplified and the task effectiveness of this case is also calculated. The method for evaluating task effectiveness on anti-ship attack can be applied in aircraft design and tactical research.