Evaluation of conflict-resolution policies on controller taskload

In an effort to maintain safety while satisfying growing air traffic demand, air navigation service providers are considering the inclusion of advisory systems to identify potential conflicts and propose resolution commands for the air traffic controller to verify and issue to aircraft. To understand the potential workload implications of introducing advisory conflict-detection and resolution tools, this paper examines a metric of controller taskload: how many resolution commands an air traffic controller issues under the guidance of an advisory system. Through a simulation study, the research presented here evaluates how the underlying protocol of a conflict-resolution tool affects the controller taskload (system demands) associated with the conflict-resolution process, and implicitly the controller workload (physical and psychological demands). Ultimately, evidence indicates that there is significant flexibility in the design of conflict-resolution algorithms supporting an advisory system.     

基于有限元法的电磁铁磁场的计算机定量分析

随着工程领域中对电磁铁磁场分析的计算精度要求的不断提高,要求有新的数值分析方法以适应这一需求,有限元法即是符合这一需求的分析方法。主要阐述了应用有限元法分析数字阀电磁铁问题的基本思想,并运用该方法对产品前期设计进行了精密的计算和性能预测,节省了大量的设计费用,经济可比性较高。     

MentorEDA系统对VHDL语言的模拟,综合优化及FPGA设计

描述了VHDL语言的功能，重点阐述了MentorEDA系统对VHDL语言的模拟、综合、优化及FPGA设计。     

Approaches to the development of biomedical support systems for piloted exploration missions

Many aspects of the biomedical systems developed and realized aboard orbital stations, the International space station in the first place, deserve to be regarded as predecessors of the systems for health monitoring and maintenance of future exploration crews. At the same time, there are issues and tasks which have not been yet fully resolved. Specifically, these are prevention of the adverse changes in body systems and organs due to microgravity, reliable protection from the spectrum of space radiation, and elucidation of possible effects of hypomagnetic environment. We should not walk away from search and development of key biomedical technologies such as a system of automated fitness evaluation and a psychodiagnostic complex for testing and optimization of operator′s efficiency, and others. We have to address a large number of issues related to designing the composite life support systems of the utmost autonomy, closure and ecological safety of the human environment that will provide transformation of all kinds of waste. Another crucial task is to define a concept of the onboard medical center and dataware including the telemedicine technology. All the above developments should assimilate the most recent achievements in physiology, molecular biology, genetics, and advanced medical technologies. Biomedical researches on biosatellites also do not lose topicality.     

Aeroelastic stability analysis of heated flexible panel subjected to an oblique shock

The critical conditions for aeroelastic stability and the stability boundaries of a flexible two-dimensional heated panel subjected to an impinging oblique shock are considered using theoretical analysis and numerical computations, respectively. The von-Karman large deflection theory of isotropic flat plates is used to account for the geometrical nonlinearity of the heated panel, and local first-order piston theory is employed in the region before and after shock waves to estimate the aerodynamic pressure. The coupled partial differential governing equations, according to the Hamilton principle, are established with thermal effect based on quasi-steady thermal stress theory. The Galerkin discrete method is employed to truncate the partial differential equations into a set of ordinary differential equations, which are then solved by the fourth-order Runge-Kutta numerical integration method. Lyapunov indirect method is applied to evaluate the stability of the heated panel. The results show that a new aeroelastic instability (distinct from regular panel flutter) arises from the complex interaction of the incident and reflected wave system with the panel flexural modes and thermal loads. What’s more, stability of the panel is reduced in the presence of the oblique shock. In other words, the heated panel becomes aeroelastically unstable at relatively small flight aerodynamic pressure.     

编队飞行卫星群相对轨道摄动运动分析

编队飞行卫星群在运行过程中将受到各种摄动因素的影响,相对运动队形可能受到破坏而影响飞行任务的完成。针对中、低轨道编队飞行任务,分析了各种摄动因素对编队卫星相对队形的影响;导出了编队飞行卫星群相对队形的稳定条件;最后,结合稳定条件对典型编队队形进行了分析。     

人控交会对接控制方法研究

追踪器上的航天员根据摄像机的图像手动操作手柄完成目标器和追踪器的对接任务,为了减轻航天员负担,提高人控对接成功率,文章提出的思路是姿态控制采用自动控制,使得追踪器姿态和合作目标器姿态保持一致,航天员只负责相对位置控制。文章给出了航天员的相对位置控制策略,并将全系数自适应控制和PID控制方法用于追踪器的姿态控制。仿真结果表明,采用全系数自适应控制进行姿态控制过渡过程时间短、稳态精度高,有利于航天员完成人控对接的任务。     

风场对舱-伞系统着陆姿态影响的仿真研究

风场对舱-伞系统的落点及姿态稳定性存在不可忽略的影响。文章对某型号飞船在几种不同风场条件下的回收过程进行了仿真研究,着重分析了风对返回舱各项参数的影响,所得结论对回收系统设计具有重要的参考价值。     

反舰导弹末端蛇行机动的控制信号设计

采用过载控制技术设计了反舰导弹的飞行控制系统,对反舰导弹的末 端蛇行机动的控制问题进行了研究。设计了实现末端蛇行机动的两组控制信 号:过载控制信号和质心控制信号。在这两组控制信号的综合控制下,反舰导弹 实现了多种形式的末端航向和纵向蛇行机动。弹道仿真表明了所设计的控制信 号的有效性。