民用飞机飞行载荷筛选方法研究

以某大型民用飞机为例,对设计点方法、参数分析与选择法、单值包线法以及组合包线法等四种飞行载荷筛选方法进行了分析说明,载荷筛选方法对飞行载荷设计有极其重要的意义,并在目前飞机型号设计中得到广泛的应用。     

The Hidden Costs of Reliability and Failure in Launch Systems

In comparing the costs of different launch vehicles, the possibility of the risk of failure is assumed to be accounted for by the cost of insurance. The satellite may be insured against loss during launch, and the launch services provider may offer a free relaunch. However, actual costs of reliability and failure extend beyond this. Each failure necessitates an investigation and a get well programme by the operating agency, while putting the operations team on hold until services can resume. A commercial operator may also lose customer revenue and actual customers through loss of confidence or unavailability. Such costs tend to be hidden, and not evaluated in assessing the effectiveness of a system, but count towards total costs. Failure investigations help to improve system reliability, but this could equally have been achieved by expenditure in development and qualification. Reusable launch vehicles will have different costs associated with reliability and failure. The relationship between reliability and cost, properly assessed, ought to influence the design of both expendable and reusable launch systems.     

Z1Cr18Ni9Ti不锈钢法兰的铸造工艺研究

本文介绍了一种Z1Cr18Ni9Ti零件的制造方法，即用铸造方法。这种方法可以节省材料，提高效率，降低成本，并在此基础上探讨了有效的熔炼和铸造工艺。     

Cost Engineering – The new paradigm for space launch vehicle design

The paper describes the basic definition and application of 'Cost Engineering' which means to design a vehicle system for minimum development cost and/or for minimum operations cost. This is important now and for the future since space transportation has become primarily a commercial business in contrast to the past where it has been mainly a subject of military power and national prestige. Several examples are presented for minimum-cost space launch vehicle configurations, such as increasing vehicle size and/or the use of less efficient rocket engines in order to reduce development and operations cost. Further a cost comparison is presented on single-stage (SSTO)-vehicles vs. two-stage launchers which shows that SSTOs have lower development and operations cost although they are larger, respectively have a higher lift-off mass than two-stage vehicles with the same performance. The design of a space tourism-dedicated launch vehicle is an extreme challenge for a cost-engineered vehicle design in order to achieve cost per seat not higher than $50,000. Finally an outlook is presented on the different options for manned Earth-to-Moon transportation modes and vehicles – another most important application of 'cost engineering', taking into account the large cost of such a future venture.     

有控飞行力学在无人飞行器研制和使用中的作用

本文从工程实践观点出发，结合无人飞行器，特别是战术导弹和制导兵器的特点，扼要讨论了与此密切相关的有控习行力学研究工作的某些进展情况，文中将有控习行力学问题分为两大类，即典型的飞行力学问题和相关的飞行力学问题，强调了多学科交 对飞行力学研究的重要意义；同时，还指出了有控飞行力学在未来軎与研制和使用中的作用。     

伴飞诱饵支援条件下无人飞行器协同作战效能研究

针对复杂的威胁环境，介绍了伴飞诱饵在体系作战条件下的应用情况；基于排队论的突防概率模型，研究了伴飞诱饵支援条件下，无人飞行器的协同突防概率和效费比：提出了作战体系作战时效性的概念；建立了火力对抗条件下无人飞行器打击防空导弹防御体系的Lanchester方程，利用所建模型分析了伴飞诱饵对作战时效性的贡献。研究表明，排队论和Lanchester方程用于伴飞诱饵条件下的无人飞行器协同作战效能研究是有效的。     

电磁场对航空电子设备干扰的预测研究

论述飞机内部辐射电磁通过电缆线感应耦合，形成对电子设备干扰的机理，分析这种干扰模式既有辐射，又有传导的复合特点。应用孔缝衍射、场对线激励、含分布源传输线和网络分析等理论与方法，逐层剖析描述了预测数学模型，并给出了能够对电子设备电子元件级进行可靠性和安全性评估的实用预测软件。     

舰载飞机弹射起飞过程中的几个问题

本文着重研究舰载飞机在甲板起飞时采用一种弹射起飞所出现的一些问题:(1)地效对舰载飞机起飞时下沉量的影响;(2)起飞姿态和起落架突伸问题;(3)前起落架载荷与起飞特性的关系。     

舰载机服役环境中微生物的提取及其对 7B04铝合金腐蚀行为的影响

舰载机服役环境恶劣,容易遭受微生物腐蚀。从舰载机油箱和电子元件材料腐蚀产物中取样,进行微生物的分离、提取与鉴定,筛选出 7种典型菌株。通过开路电位(OCP)、电化学阻抗谱(EIS)和动电位极化曲线等电化学测试,初步研究了其中 3种菌对 7B04铝合金腐蚀行为的影响。试验结果表明,假丝酵母菌对 7B04铝合金腐蚀有抑制作用,而鲁氏不动杆菌和副干酪乳酸菌具有促进腐蚀的作用。     

失速改出伞阻力特征面积估算方法

研究了高平尾布局飞机的气动特性。使用失速改出伞是飞机改出深失速的重要途径,但如何确定失速改出伞的关键参数(阻力面积等)却没有现成的方法。以ARJ21-700飞机为例,分别使用公式分析法、类比法综合估算出失速改出伞的关键参数,通过模型自由飞和模拟仿真分析验证其具有足够效能将飞机改出深失速状态。形成了一套新机失速改出伞的设计方法和关键数据图表,可供其他型号飞机失速改出伞的设计研制使用。