Three-dimensional analysis of relationship between relative orientation and motion modes

Target motion modes have a close relationship with the relative orientation of missile-totarget in three-dimensional highly maneuvering target interception. From the perspective of relationship between the sensor coordinate system and the target body coordinate system, a basic model of sensor is stated and the definition of relative angular velocity between the two coordinate systems is introduced firstly. Then, the three-dimensional analytic expressions of relative angular velocity for different motion modes are derived and simplified by analyzing the influences of target centroid motion, rotation around centroid and relative motion. Finally, the relationships of the relative angular velocity directions and values with motion modes are discussed. Simulation results validate the rationality of the theoretical analysis. It is demonstrated that there are significant differences of the relative orientation in different motion modes which include luxuriant information about motion modes. The conclusions are significant for the research of motion mode identification,maneuver detection, maneuvering target tracking and interception using target signatures.     

Integrated Framework for Understanding Relationship Between Human Error and Aviation Safety

Introducing a framework for understanding the relationship between human error and aviation safety from multiple perspectives and using multiple models. The first part of the framework is the perspective of individual operator using the information processing model. The second part is the group perspective with the Crew Resource Management （CRM） model. The third and final is the organization perspective using Reason＇s Swiss cheese model. Each of the perspectives and models has been in existence for a long time, but the integrated framework presented allows a systematic understanding of the complex relationship between human error and aviation safety, along with the numerous factors that cause or influence error. The framework also allows the identification of mitigation measures to systematically reduce human error and improve aviation safety.     

机电伺服系统机构和控制集成设计方法研究现状

传统的机电系统设计方法中,机械和控制系统串行设计,通常无法获得优化的设计结果.随着机电伺服系统性能要求的持续提高,建立统一机械和控制系统数学模型,同时进行机械和控制参数优化设计的集成设计方法成为目前精密机电系统设计研究的前沿.     

复杂工程系统研发中的技术状态管理

围绕复杂工程系统的本质特征和研发过程的难控性提出进行技术状态管理的必要性;结合实际飞机系统的工作分解结构,分析了技术状态管理过程中技术状态标识过程、技术状态基线控制、技术状态纪实和技术状态审核等关键技术活动;提出了比较完备的技术状态管理体系结构,并指出流程管理在该体系结构中的重要性。     

坐标认识天球

对于天文初学者来说，他们也许会感到奇怪，为什么离我们上千光年远的恒星的位置会被束缚在一个类似地球经纬度的系统中？ 天球坐标系统虽然在现代天文学中得到广泛使用，但是它却是基于我们祖先错误的世界观所建立的。他们认为地球是静止的，而且位于宇宙的中心。同时他们相信天空是一个中空的球面，覆盖在地球上，就像一个巨大的圆顶。     

关于Weibull分布条件方法的研究

推导了Weibull分布单样预测区间的条件方法的简便表达式。并对Weibull分布参数与特征的置信区间的条件方法、单样预测区间的条件方法的性质给予了初等证明。给出了单样预测区间的计算方法，并用数值例作了说明。     

面向我国连锁零售企业的客户维系研究

我国连锁零售企业客户流失问题己经成为制约其发展的重要因素之一.为了解决这一问题,应整合CRM,走差异化营销道路,企业文化要建立在为员工服务的基础上,增强凝聚力.在连锁零售企业中,实施客户满意、保持员工诚信度,从而达到连锁零售企业维系客户的目的.     

基于事件触发的航天器变周期控制方法研究

摘要： 随着未来航天技术的发展对航天器自主性工作的要求越来越高,星上嵌入式系统所需处理的数据量也急剧增大.而如何在通信与计算资源约束下保证航天器性能就成为一个关键问题.本文基于事件触发控制方法,提出一种在保证控制性能前提下能够大幅降低星上总线负载的航天器姿态控制方法.并从扰动系统理论出发,给出算法的设计流程和稳定性证明.通过仿真算例验证算法的有效性.