面向航线网络体系的客机设计指标权衡方法

为了通过客机的市场分析与总体设计的紧密结合进行关键设计指标的更充分的权衡,提出了从航线网络体系的视角进行指标集效能评价的方法。这一方法以燃油效率作为经济性评价准则,基于运营统计数据建立综合考虑航线航程概率及航线实际乘客数概率的运输周转量概率密度分布,结合客机运行空重的估算,计算出各条航线消耗的燃油重量,进而通过多轮次的仿真分析出不同指标集对应的燃油效率概率密度。分析结果有助于权衡各个指标集的潜在设计方案适合在何种航线上运营,以及从燃油效率的角度分析潜在设计方案对航空公司的吸引力。通过在一个算例中对航程和载客量的变化进行计算和分析,说明了所提方法的应用方式,最后对目前研究的局限之处和后续的研究方向进行了探讨。     

ETOPS特点与设计的特殊考虑

ETOPS广泛应用于远程、跨洋、极地的飞行。回顾了ETOPS规章的演变和应用以及ETOPS的特点,并从飞机设计的角度提出了ETOPS型号设计需关注的若干要点。通过多视角的回顾,更加直观地体现了ETOPS设计的内涵,可为ETOPS型号设计提供参考。     

中国航空运输业规制:实证分析与对策思考

航空运输业规制历史悠久,从理论和实践来看,自然垄断性并不是对航空运输业进行规制的主要原因.中国对航空运输业的规制来源于政府的行政干预和国有资产所有者地位,这种规制造成了企业的低效率和产业发展的困难.在实证分析了规制对中国民航业的影响之后,针对中国的民航规制改革,提出了应选择的对策措施和改革路径.     

航空联盟中的博弈分析

在阐述联盟博弈含义的基础上,利用特征函数对企业多方合作决策的博弈过程进行分析.给出了航空联盟中核心的计算,说明了利用Shapley值计算航空联盟中分配的合理性,并举例对航空联盟的收益问题进行分析.     

美国高轨抵近操作卫星MiTEx飞行任务及启示

简述了美国"微卫星技术试验"(Micro-satellite Technology Experiment,MiTEx)计划进展情况,根据目前可获得的最新的MiTEx卫星轨道数据,对其整个飞行过程进行了深入研究,划分了MiTEx-A卫星与MiTEx-B卫星飞行阶段,描述了各阶段飞行轨迹,给出了飞行任务关键数据,对其飞行任务进行了总结。在飞行任务分析的基础上,结合国外对MiTEx卫星的相关报道,分析了MiTEx卫星可能具备的抵近操作任务执行能力,提出了对高轨非合作目标抵近操作应用的启示,总结分析了执行高轨抵近操作任务所需的关键技术。     

一种估算ETOPS时间限制系统时间性能的方法

ETOPS时间限制系统的时间性能要求是飞机系统设计的重要输入,是确保飞机系统设计满足最大ETOPS改航能力的前提.结合工程经验以及ETOPS运行特点,提出了一种估算ETOPS时间限制系统时间性能的方法.通过案例计算表明,航路温度和风对于确定ETOPS时间限制系统时间性能的影响是明显的.提出的计算、分析方法可用于飞机设计阶段对ETOPS时间限制系统时间性能的工程估算.     

Introducing the law games: Predicting legal liability and fault in satellite operations

Over recent times there has been a rise in the number of objects placed into Earth orbit. With various countries licensing a number of large constellations, the orbital population is set to increase dramatically. A significant number of technical advances have facilitated this and, in the UK and elsewhere, this has been matched by the updating of legislation and an increased policy focus on the need for increased space surveillance and tracking. The rise of large constellations coupled with an increasing number of experimental techniques such as active debris removal or on-orbit servicing procedures means that establishing fault will be crucial if litigation is to be successful. In doing this, any legal proceedings will look at both norms of behaviour, deviation from which will point towards fault and the types and standard of evidence that will be required.This paper will outline these problems in detail. It will be proposed that what is required to map out the contours of liability are both codification of the norms for satellite operations and clarity on protocols for evidence gathering in cases where fault may be contested in orbital operations. This discussion will identify that a way in which this could be achieved is by the use of “space law games”. These are simulations, similar to military war games, in which fictional scenarios could highlight some of the key legal issues that might need to be dealt with. The paper will outline some of the ways in which the law games might work and pose questions as to what data and other considerations will be needed to make such simulations meaningful.     

A pre-generated matrix-based method for real-time robotic drilling chatter monitoring

Currently, due to the detrimental effects on surface finish and machining system, chatter has been one crucial factor restricting robotic drilling operations, which improve both quality and efficiency of aviation manufacturing. Based on the matrix notch filter and fast wavelet packet decomposition, this paper presents a novel pre-generated matrix-based real-time chatter monitoring method for robotic drilling. Taking vibration characteristics of robotic drilling into account, the matrix notch filter is designed to eliminate the interference of spindle-related components on the measured vibration signal. Then, the fast wavelet packet decomposition is presented to decompose the filtered signal into several equidistant frequency bands, and the energy of each sub-band is obtained. Finally, the energy entropy which characterizes inhomogeneity of energy distribution is utilized as the feature to recognize chatter on-line, and the effectiveness of the presented algorithm is validated by extensive experimental data. The results show that the proposed algorithm can effectively detect chatter before it is fully developed. Moreover, since both filtering and decomposition of signal are implemented by the pre-generated matrices, calculation for an energy entropy of vibration signal with 512 samples takes only about 0.690 ms. Consequently, the proposed method achieves real-time chatter monitoring for robotic drilling, which is essential for subsequent chatter suppression.     

高原航线飘降越障要求和算例分析

由于高原航线地形复杂,航路最低安全高度高,飘降分析复杂。同时针对有些飞行员、签派员、性能人员等对飘降的理解存在一定的偏差,本文对飘降的过程和相关的越障要求进行了解释。并以A319—115机型执行成都一林芝航线为例,探讨了高原航线飘降问题的分析方法和注意事项。     

中国航空公司常旅客计划会计的构建

阐述了航空公司常旅客计划所带来的会计问题以及中国航空公司建立常旅客计划会计的紧迫性与可行性;研究与分析了美国、国际航空运输协会以及国际上主要航空公司常旅客计划会计实务;最后着重研究了中国航空公司常旅客计划会计的内容、会计政策的选择,同时提出了适合中国航空公司常旅客计划的会计实务.