数字近景摄影测量野外特殊研究区域活动控制系统设计与实现

为了满足特殊区域(硐室、隧道)岩体结构面三维信息快速采集的需要,利用S304不锈钢方钢管设计并制作了一套可拆卸的、其上带有28个控制点的活动控制系统,应用免棱镜激光全站仪对28个控制点进行观测获得其空间三维坐标值,精度评定点位误差为±2mm;同时对该活动控制架进行了室内外稳定性检验:室内通过检验两个邻近控制点的间距,结果显示其误差在±1mm之内;室外通过实际观测与坐标转换值进行对比其控制点误差在±3.2 mm之内,该误差可以满足数字近景摄影测量技术中对中等精度要求方面的工程应用。经野外验证该活动控制系统自身坚固、结构稳定、拆卸后体积小、重量轻、野外应用携带方便,加之高清晰度的成像为野外特殊区域的控制测量提供了保障。该系统的建立满足了数字近景摄影测量技术在特殊岩体结构面信息快速获取中的需要。

基于FlightGear的A-SMGCS场面活动三维仿真

针对A-SMGCS系统场面活动三维仿真问题,提出一种以开源模拟飞行器FlightGear为场景仿真平台,以实时ADS-B监视数据为驱动,以Linux为操作平台的机场场面活动三维仿真系统设计新方法。仿真系统按照实际机场模型进行机场布局设计,飞机、航站楼、塔台三维建模,地形数据生成,对真实机场环境进行了完整建模。由于ADS-B监视数据缺少飞机姿态信息,提出一种根据位置数据推算出姿态信息的新方法。首先把ADS-B监视数据进行航迹卡尔曼滤波,然后根据飞机前后两个位置的空间连线矢量计算飞行姿态。通过FlightGear多机网络数据接口导入飞机定位数据与姿态数据驱动飞机模型运动,实现了对飞机运动的六自由度仿真。仿真结果表明,该系统能逼真、准确再现真实机场飞机实时活动情况。由于完全基于开源软件设计,该系统低成本实现了对场面活动的实时三维仿真。

基于VDL-4技术的机场场面车辆管理系统研究

介绍了VDL-4数据链通信技术与GPS定位技术,并利用其设计了一套实用化的机场场面车辆管理系统。分析了该系统中的车载终端系统采用GPS+航位推算(DR)+地图匹配(MM)技术不仅可以提高系统的定位精度,而且也可以提高抗GPS遮挡能力。由于VDL-4数据链符合ADS-B技术标准,也便于将该系统扩展到飞机上应用,实现统一的场面管理。

基于多智能体系统的飞机滑行路径规划

为解决先进场面活动引导与控制系统中的飞机滑行初始路径规划问题,提出一种基于多智能体系统(multi-agent system,MAS)仿真的方法实现飞机在场面上任意起始点到目的地的最短路径规划.首先,针对传统的有向图模型对机场场面运行刻画不足的问题,提出滑行资源图模型对机场控制区进行建模,既能对机场控制区进行高效建模又使模型不过于复杂.其次,设计最短路径规划多智能体系统,通过飞机Agent在资源节点Agent的繁殖能力与对资源的独占属性限制,实现对资源节点遍历并同时又保证每个节点最多被访问一次;最后,利用Anylogic实现机场场面初始路径规划多智能体仿真系统开发.仿真结果表明,设计的多智能体系统不但能快速计算出最短路径,且路径规划过程直观可视,算法复杂度与Dijkstra算法相同,满足初始路径规划要求.

多点定位混叠信号的盲分离

将盲分离算法应用到多点定位系统的抗干扰处理中,介绍了对多点定位的干扰形式和混叠情况,分析了分离混叠信号的物理依据和相应的方法,阐述了盲分离算法的原理和白化方法。采用盲分离领域的快速固定点算法分离和重构信号,结合多点定位系统的特点作了相应改进,给出了详细的步骤。仿真结果表明,快速固定点算法能够有效分离多点定位系统的S模式混叠信号,获得了较高的成功率。

Active control of structural vibration by piezoelectric stack actuators

This paper presents a general analytical model of flexible isolation system for application to the installation of high-speed machines and lightweight structures. Piezoelectric stack actuators are employed in the model to achieve vibration control of flexible structures, and dynamic characteristics are also investigated. Mobility technique is used to derive the governing equations of the system. The power flow transmitted into the foundation is solved and considered as a cost function to achieve optimal control of vibration isolation. Some numerical simulations revealed that the analytical model is effective as piezoelectric stack actuators can achieve substantial vibration attenuation by selecting proper value of the input voltage.

Automobile active suspension system with fuzzy control

A quarter-automobile active suspension model was proposed. High speed on/off solenoid valves were used as control valves and fuzzy control was chosen as control method . Based on force analyses of system parts, a mathematical model of the active suspension system was established and simplified by linearization method. Simulation study was conducted with Matlab and three scale coefficients of fuzzy controller (ke, kec, ku) were acquired. And an experimental device was designed and produced. The results indicate that the active suspension system can achieve better vibration isolation performance than passive suspension system, the displacement amplitude of automobile body can be reduced to 55%. Fuzzy control is an effective control method for active suspension system.

The First Push of the Universe and Origin of Life

Everything in the universe occurs spontaneously. The first push of the universe signifies the capabilities of the universe in automatic movement, automatic reaction and change, automatic generation and development, automatic cognition and thinking, automatic organization, autonomous behavior and automatic control. Diverse substances, objects, thinking and life entities in the universe are all at automatic movement and change. There are 4 automatic reactions within the physical system： chemical reaction, nuclear fusion reactions, quark confinement reaction and weak interaction. Correspondingly, there are 4 similar reactions in organisms. The life entities include the life universe, organisms, human being, societies and artifacts. The automatic dynamic system exists within the life entities which has automatic cognition and thinking abilities. 4-season movement of life happens automatically. The automatic control of life movement includes 4-season control and thinking control whilst the later is an active type. The life universe forms under the automatic organization of the universe thinking. The social life entities are an active control system of thinking. The society has 5 automatic dynamic systems. The society is a life entity that automatically generates under the control and organization of thinking. The artifacts and the future artificial life are formed under the automatic organization and fabrication of human beings under the control of thinking. The earth is a life entity capable of making various biological molecules and 4-season mechanisms of organisms. The organism is created gradually during 4-season movement of earth and solar system.

基于空闲时间窗和多Agent的A-SMGCS航空器滑行路由规划

先进场面活动引导与控制系统(A-SMGCS)中的航空器滑行路由规划是一个典型NP难题。为解决航空器滑行路由规划的优化性和计算量之间的矛盾,提出一种基于空闲时间窗的路由规划方法,并利用多Agent系统(MAS)进行算法求解。首先,建立滑行资源图以对场面滑行区进行建模。其次,按照航班计划为航空器设置滑行优先级,并按优先级顺序依次规划路由,后规划的路由不破坏已有路由,即利用滑行路段的空闲时间窗进行规划。每次只需为一架航空器规划滑行路由,降低了问题的求解难度;通过搜索空闲时间窗获得路由使场面交通均衡分布,保证了路由规划的整体优化性。分析了空闲时间窗特性,指出空闲时间窗的可达性条件和避免同步资源交换冲突的条件。最后,设计MAS,把建立、维护和搜索空闲时间窗图的复杂集中式求解过程简化为通过路由管理Agent,航空器Agent和资源节点Agent相互协作实现对场面路由规划问题的分布式求解。仿真结果表明,设计的MAS能够快速找到空闲时间窗中的最优解;与固定预选滑行路径算法相比,航空器的平均滑行时间显著减少,最多可以节省19.6%的滑行时间。