电力作业直升机AS350B3改装设计审定

为对直升机重要改装设计的认证程序进行深入研究,以电力作业直升机AS350B3为例,对其挂架进行了改装设计和性能分析,提出适航审定基础,确定挂架满足适航法规要求的符合性验证方法,给出改装设计批准书(MDA)的审定流程,为电力作业直升机重要改装设计的适航审定提供理论依据。     

浅析验证性改装

验证性改装通过对在役飞机进行改装来论证改装设计符合审定基础，是一种符合性方法。本文简要介绍了验证性改装的性质以及与批准改装的区别，以及航空公司对于验证性改装的认识误区和对快速处理偏差的建议。     

浅谈直升机重要改装设计适航符合性验证方法

探讨了民用直升机在持续适航阶段为满足特殊用途而进行的重要改装设计的适航性问题。着重论述了直升机重要改装设计的适航符合性验证方法。     

航空器加／改装管理工作探讨

AProbetotheManagementonAircraftRemould目前，随着进口西方国家飞机的增多，机龄增长，机队增大，越来越多的航空公司面临对在设的机队进行加／改装工作，有些是为了满足运航当局的要求，即安全要求，如适航指令要求的加／改装；有些是航空公司为了增加经济效益而进行的加／改装，如选用某些服务通告等。无论何种加／改装工作，首先面临的是方案问题，其次是方案的实施。本支探讨进口西方航空器加／改装方案的合法性、方案的实施、目前我国存在的问题及发展方向，与有兴趣民航维修事业管理者进行探讨。航空公司在对飞机从事加／改装工作…     

航空燃机WS9改型为船用、工业用燃机的改装设计特点

目前，各国的船用的工业用燃机，均走用航空燃气机改装的道路，但船用和工业用燃机有其自身的特殊设计要求。本根据WS9航机改装为船用和工业用燃机的设计试验工作中所遇到的问题和解决的途径，对改装设计特点进行了初步总结。可供今后改装设计工作参考。     

飞机载重平衡数据包的更改

近几年,国内某航空公司为应对市场需求,对其机队的大多数机型进行了高端经济舱改装。在设计改装方案阶段,一个重要的工作就是修改载重平衡的相关数据。本文以波音737-700飞机的客舱改装为例,探讨装载平衡图的更改方法。     

飞机维修

7月份，中原航空公司有 3架飞机在 GAMECO做雷达、近地警告系统改装，还有一架飞机进行 5C检。这是在中国国内首次做此改装。虽然外方提供的工程指令、线路图很不齐全，造成了时间耽搁，但在资料到齐后， GAMECO工程部、电子车间、高检以及其他有关部门加班加点，尽量抢时间，圆满地完成了 3架飞机的改装。 AMECO成功完成 178隔框改装 近日，北京飞机维修工程有限公司（ AMECO）在为云南航空公司的一架波音 737飞机实施 D检过程中，成功地对机身站位 178隔框结构进行了改装。这是国内首次实施这一改装，标志着 AMECO在飞机改装…     

直升机重要改装设计及适航审定研究

科技进步使得通用航空公司发展迅速,直升机的作业范围也越来越广泛,如农林喷洒、医疗急救、航拍等。为了满足直升机不同作业的需求,对直升机进行适航改装变得十分重要。通过对直升机重要改装的设计和适航审定进行研究,阐述了适航审定过程中的几个关键技术,为通航类航空公司进行直升机改装提供借鉴。     

工程设计能力的开发利用

探讨了航空公司进行飞机改装工作的一种选择,即民航总局颁发的适航管理程序AP21-15(进口民用航空器重要改装设计批准审定程序)。研究表明,这将缩短改装周期,节省改装费用。     

基于AS350B3的电力作业直升机供氧设备改装设计

AS350B3直升机常被用来执行电力作业任务,而在高原等缺氧地区,有必要为其加装供氧设备以保证机组人员的安全作业。本文对AS350B3直升机供氧设备的加装设计进行分析,提出了适航审定基础,确定了符合性验证方法,给出了改装设计批准书的审定流程,为电力作业直升机重要改装设计提供依据。     

有翼高超声速再入飞行器气动设计难点问题

有翼高超声速再入飞行器是近年来的研究热点,气动设计是飞行器设计的关键。为了更清楚地认识有翼高超声速再入飞行器气动设计的难点问题,对有翼高超声速再入飞行器的发展、优势及总体任务剖面进行了介绍,从5个方面详细介绍了该类飞行器气动设计的难点问题,包括多约束复杂面对称气动布局设计、高温真实气体效应对气动特性影响、天地差异与天地换算方法、反作用控制系统(RCS)喷流干扰对气动特性的影响以及气动数据不确定度等,简要阐明了这些难点问题对总体设计的重要性以及初步的解决思路,为有翼高超声速再入飞行器气动设计提供了一些参考。     

Simulation and Analysis of Crashworthiness of Fuel Tank for Helicopters

Crashworthiness requirement of fuel tanks is one of the important requirements in helicopter designs. The relations among the protection frame, textile layer and rubber layer of the fuel tank are introduced. Two appropriate FE models are established, one is for an uncovered helicopter fuel tank without protection frame, and the other is for fuel tank with protection frame. The dynamic responses of the two types of fuel tanks impinging on the ground with velocities of 17.3 m/s are numerically simulated for the purpose of analyzing energy-absorbing capabilities of the textile layer and protection frame. The feasibility of the current crashworthiness design of the fuel tank is examined though comparing the dynamic response behaviors of the two fuel tanks.     

The effect of inlet conditions on the flow and heat transfer in multiple rotating cavity with axial throughflow

This paper discusses experimental results from two different build configurations of a heated multiple rotating cavity test rig.Measurements of heat transfer from the discs and tangential velocities are presented.The test rig is a 70% full scale version of a high pressure compressor stack of an axial gas turbine engine.Of particular interest are the internal cylindrical cavities formed by adjacent discs and the interaction of these with a central axial throughflow of cooling air.Tests were carried out for a range of non-dimensional parameters representative of high pressure compressor internal air system flows(Re up to 5×106 and Rez up to 2×105).Two different builds have been tested.The most significant difference between these two build configurations is the size of the annular gap between the(non-rotating) drive shaft and the bores of the discs.The heat transfer data were obtained from thermocouple measurements of surface temperature and a conduction solution method.The velocity measurements were made using a two component,LDA system.The heat transfer results from the discs show differences between the two builds.This is attributed to the wider annular gap allowing more of the throughflow to penetrate into the cavity.There are also significant differences between the radial distributions of tangential velocity in the two builds of the test rig.For the narrow annular gap,there is an increase of non-dimensional tangential velocity V/Ωr with radial location to solid body rotation V/Ωr=1.For the wider annular gap,the non-dimensional velocities show a decrease with radial location to solid body rotation.      

突破技术趋同，波音再现竞争优势

 波音公司面临着来自空客公司的巨大挑战,企业战略性创新才是公司成功的关键。为此波音公司的全部战略性研究集中在扩大产品的差异性上,体现在3个方面：电子化（e-Enabled）运营环境、整体复合材料机身部件的制造技术和支持波音787客机的全球协同环境（GCE）。     

临近空间飞行器测控与信息传输系统频段选择

 临近空间飞行器是高性能信息化武器平台,测控（TT&;C）与信息传输系统是其信息保障的核心,而选择合理、可行的频段是展开系统设计的前提和基础。频段选择影响到整个技术方案的制定,是一个需综合考虑、影响深远并具有战略意义的关键问题,从国际电联（ITU）国际标准、高速数传、接收信噪比（SNR）、“三抗”、超视距中继、黑障、雨衰以及设备研制成熟度8个方面全面、细致论证了近空间平台测控系统的频段选择问题,最终得出在视距链路中以Ka频段为宜,在超视距链路中以Ku/Ka双频段为宜的结论。     

基于弯曲激波压缩系统的高超声速进气道反设计研究进展

总结了近十年来弯曲激波压缩研究的主要成果。提出了弯曲激波压缩系统的新概念,即利用特殊设计的楔形弯曲压缩面或空间弯曲压缩面,产生一系列与前缘弱激波相互交汇或叠加的压缩波系,从而使前缘激波弯曲,形成特殊的弯曲激波,它与波后的等熵压缩波来共同完成对气流的压缩。在此基础上,实现了由给定出口气动参数的超声速内流道反设计,实现了由给定压缩面压力分布和给定压缩面马赫数分布要求的型面反设计,实现了由给定激波波面的压缩型面反设计。研究证明,弯曲压缩面-弯曲激波压缩系统具有良好的综合气动性能,为高性能高超声速进气系统的气动设计提供了一种全新的设计方法。     

Experimental Study on Effects of Fuel Injection on Scramjet Combustor Performance

In order to investigate the effects of fuel injection distribution on the scramjet combustor performance, there are conducted three sets of test on a hydrocarbon fueled direct-connect scramjet test facility. The results of Test A, whose fuel injection is carried out with injectors located on the top-wall and the bottom-wall, show that the fuel injection with an appropriate close-front and centralized distribution would be of much help to optimize combustor performances. The results of Test B, whose fuel injection is performed at the optimal injection locations found in Test A, with a given equivalence ratio and different injection proportions for each injector, show that this injection mode is of little benefit to improve combustor performances. The results of Test C with a circumferential fuel injection distribution displaies the possibility of ameliorating combustor performance. By analyzing the effects of injection location parameters on combustor performances on the base of the data of Test C, it is clear that the injector location has strong coupled influences on combus- tor performances. In addition, an inner-force synthesis specific impulse is used to reduce the errors caused by the disturbance of fuel supply and working state of air heater while assessing combustor performances.     

(高)超声速流动试验技术及研究进展

近年来,与高速飞行器相关的(高)超声速流动受到了极大的关注。这类流动所具有的非定常性、强梯度和可压缩性对试验方法和风洞设计技术提出了挑战。超声速纳米示踪平面激光散射(NPLS)技术是由作者所在团队研发的非接触光学测试技术。它能够以较高的空间分辨率来揭示超声速三维流场的一个瞬态剖面的时间解析的流动结构。介绍了NPLS技术以及基于NPLS开发的密度场测量、雷诺应力测量和气动光学波前测量等方法,并回顾了这些技术在超声速边界层、超声速混合层、超声速压缩拐角、激波/边界层相互作用和光学头罩绕流等流动中的应用,清晰地再现了边界层、混合层、激波等典型流场结构及其时空演化特性。另外,为了模拟和研究高空大气条件下边界层自然转捩和超声速混合层的转捩特性,介绍了高超声速静风洞、超-超混合层风洞的设计技术以及层流化喷管的设计方法。     

Research on Auto-detection for Remainder Particles of Aerospace Relay Based on Wavelet Analysis

Aerospace relay is one kind of electronic components which is used widely in national defense system and aerospace system. The existence of remainder particles induces the reliability declining, which has become a severe problem in the development of aerospace relay. Traditional particle impact noise detection (PIND) method for remainder detection is ineffective for small particles, due to its low precision and involvement of subjective factors. An auto-detection method for PIND output signals is proposed in this paper, which is based on direct wavelet de-noising (DWD), cross-correlation analysis (CCA) and homo-filtering (HF), the method enhances the affectiv-ity of PIND test about the small particles. In the end, some practical PIND output signals are analysed, and the validity of this new method is proved.