动态

飞机维修AIRCRAFTMAINTENANCEAmeco与奥地利航空公司签署波音777飞机大修协议2月24日,Ameco与奥地利航空公司签署了3架波音777飞机大修协议,并于2月26日开始依次停场进行大修。Ameco于2001年开始为后来并入奥地利航的劳达航空公司提供波音777飞机维护,截至目前已为其实施了5架飞机大修。Ameco与奥地利航空公司签署了5年服务总协议,而此协议则是总协议基础上的又一项子协议。Ameco与波音公司共同召开波音737蒙皮划痕研讨会2月24日,由Ameco工程处与波音公司共同筹办的波音737系列飞机蒙皮划痕研讨会在Ameco召开。国航股份工程技术…     

航空维修业简讯

的B767飞机大修协议,飞机大修总架数达到16架,同时,还与冰岛亚特兰大航签署了5年飞机维护协议,每年将为其机队提供约10架B747飞机的C检。这是迄今为止Ameco一次获得的最大一宗国际客户飞机大修订单,这也是目前国内维修企业一次获得的国外最大订单。国航西南公司首次对B737-600进行客舱改装CNAH Southwest Airlines Completed the First B737-600’s CabinModification近日,国航西南公司为满足旅客的舒适性和安全性,对B737-600型3架飞机进行加装和公务舱、衣帽柜、隔帘、空防箱改装。 西南公司飞机维修基地航线维修部A检分部接到指令…     

维修动态

正甘肃省民航机场集团完成首架A320飞机定检2019年12月31日,甘肃省民航机场集团飞机维修分公司圆满完成首架空客A320飞机定检维修工作,顺利通过了从单纯航线维修能力到定检维修能力的实操"大考"检验,标志着该公司的维修保障能力实现了整体重大跨越。该公司于2019年10月28日取得了空客A319/A320/A321、波音737-700/800机型的定检维修许可证,成为国内首家同时具备波音737和空客A320两种机型定检维修资格的机场维修单位。     

动态

Ameco A380机库正式投入使用7月2日,—架波音737-300飞机被缓缓拖入北京飞机维修工程有限公司(Ameco)A380机库准备实施8A检维修,这是该机库落成后执行的首个飞机检修工作,标志着亚洲最     

杭州维修基地自行研制加工A320／319飞机卫生间香水瓶架子组件

本文参考北京飞机维修工程有限公司工程指令“在B737、767飞机上加装香水瓶架组件”和国航B737飞机厕所内香水瓶架子组件，自行研制加工了A320／319飞机厕所香水瓶架子组件，这对提高A320／319飞机客船服务性能，降低杭州维修基地附件维修成本，都具有重要的现实意义。     

Ameco圆满完成第1000架飞机重维修

2月24日，由Ameco工程处与波音公司共同筹办的波音737系列飞机蒙皮划痕研讨会在Ameco召开。Ameco质量管理部、飞机大修分部、飞机维修分部和工程处的部分员工以及国航股份工程技术分公司、中国联合航空公司、国航成都分公司、山东太古飞机维修公司等代表参加会议。     

STAECO:深耕专业市场 追求卓越服务

<正>5月16日,山东太古(STAECO)新增CCAR 145维修许可增项,增加了环球快车飞机高级别定检、CRJ900飞机定检以及波音737-400飞机客改货的能力,同时还获得了波音737NG飞机HGS4000系统加装能力(VSTC132)和空客A319/320/321飞机CDSS加装能力(VSTC191),维修能力得以极大增强。2013年,STAECO除巩固现有机     

波音737飞机机尾擦地的检查和维修

根据多起波音737-800飞机机尾擦地的处理经验,参考飞机制造厂的建议和文献资料,探讨了波音737系列飞机机尾擦地的原因,提出检查和维修建议,以期对类似问题的处理有所帮助。     

A320系列飞机雷达罩损伤判断和处理

目前,A320系列飞机在国内总体占比越来越大,与机队规模一同增长的是飞机的维护需求。相比于更早进入国内的波音737系列飞机,我国航空公司在A320维护经验方面仍有所欠缺,这一点在各型新机型上尤为凸显。在日常航线维护中时常会遇到A320系列飞机雷达罩的各类损伤,雷达罩的复合材料结构相比传统金属材料在结构、损伤形式、损伤处理上均有很大的不同,也时常给一线维修人员带来困扰。本文对A320系列飞机雷达罩损伤的形式及后续处理进行梳理总结,以便更为精准高效地完成A320雷达罩相关的损伤处理及飞机放行。     

未来5年空客A320飞机维修市场增长强劲

正经过多年的发展,空客A320和波音737被认为是全球最受欢迎的两款窄体飞机。据《航空周刊》机队与维修市场预测,目前全球有7251架A320ceo系列飞机和6757架波音737NG飞机在运营,而从现在到2022年,空客将交付3174架A320neo飞机,波音将交付2999架737MAX飞机。此外,预计到2020年左右波音     

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.      

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.     

Preparation of Highly Dispersed Antimony-doped Tin Oxide Nano-powder via Ion-exchange Hydrolysis of SnCl4 and SbCl3 and Azeotropic Drying

Antimony-doped tin hydroxide colloid precipitates have been synthesized by hydrolysis of SnCl4 and SbCl3 using: (1) an ion-exchange hydrolysis to remove chlorine ions, and (2) isoamyl acetate as an azeotropic solvent to obviate water. The obtained dried powder is of high dispersivity without any need for further grinding. The size and dispersivity of the final particles are investigated with the aid of TG-DTA, BET, XRD and TEM. After having calcined, the antimony-doped tin oxide nanopowder possesses a tetragonal rutile structure with high dispersivity, uniform particles and low hard agglomeration.     

Effects of Mo on the Microstructure and Hydrogen Sorption Properties of Ti-Mo Getters

The effects of Mo on the microstructure evolution, porosity and hydrogen sorption properties of Ti-Mo getters are investigated in this work. The results show that the addition of Mo prolongs the densification process of Ti-Mo getters and results in a significant amount of sintered pores. With the Mo content increasing, the porosity of getters firstly increases reaching the maximum value as it at- tains about 7.5wt.%, and then drops. At the room temperature, the hydrogen sorption property of getters increases progressively with the Mo content increasing, but the tendency is not very clear before its content lies below 2.5wt.%. When the Mo content achieves about 7.5wt.%, the hydrogen sorption property proves to be the best. The discussion is made about the above mentioned phenomena inclusive of hydrogen sorption properties of getters under different activation conditions (from 500-750 ℃).     

超声速燃烧数值模拟中的湍流与化学反应相互作用模型

高精度数值模拟有助于理解超声速湍流燃烧中湍流与化学反应的相互作用,可为发动机燃烧室等工程应用设计提供可靠的预测模型。除直接数值模拟外,目前在湍流燃烧应用中使用的大涡模拟和雷诺平均Navier-Stokes模拟均需要借助模型模化发生在湍流小尺度上的流动与化学反应过程对湍流大尺度运动的影响。现有的湍流与化学反应相互作用模型大致可分为:火焰面类模型和概率密度函数类模型,2类模型在不同的应用中各自具有优势和局限性。此外,现有模型大都基于低马赫数燃烧,而超声速燃烧中通常会伴随快速混合、局部熄火和再着火以及激波等复杂过程,这为发展其中的湍流与化学反应相互作用模型提出了更多的挑战。     

适于低轨卫星IP网络的单核共享树组播算法(英文)

为了解决低轨卫星IP网络中现有典型源组播算法的信道资源浪费问题,本文提出了一套单核共享树组播算法,即核心群合并共享树(CCST)和加权核心群合并共享树(w-CCST)算法。CCST 算法包括动态近似中心(DAC)选核方法和核心群合并组播路径构建方法。DAC方法专为周期、规律运动的低轨卫星网络提出,不需要复杂的星上计算。在核心群合并方法中,以核节点作为初始核心群,通过核心群和剩余组成员的最短路径方法逐步扩展直至整棵组播树构建完成,从而使得组播树的树代价最小,大大提高了网络的带宽利用率和组播传输效率。w-CCST 算法中所提出的加权因子可以调整树代价和端到端传播时延之间的折衷程度,因此,可以通过调整加权因子来适度增大树代价、降低端到端传播时延以支持某些端到端时延要求苛刻的实时组播业务。最后,与低轨卫星 IP 网络中典型算法进行了性能比较,仿真结果说明,CCST 算法的平均树代价比其它算法显著降低,w-CCST 算法的平均端到端传播时延小于 CCST 算法。     

Jet Vectoring Control Using a Novel Synthetic Jet Actuator

A primary air jet vectoring control system with a novel synthetic jet actuator (SJA) is presented and simulated numerically. The results show that, in comparison with an existing traditional synthetic jet actuator, which is able to perform the duty of either “push” or “pull”, one novel synthetic jet actuator can fulfill both “push” and “pull” functions to vector the primary jet by shifting a slide block inside it. Therefore, because the new actuator possesses greater efficiency, it has potentiality to replace the existing one in various appli- cations, such as thrust vectoring and the reduction of thermal signature. Moreover, as the novel actuator can fulfill those functions that the existing one can not, it may well be expected to popularize it into more flow control systems.     

Nonlinear Adaptive Slewing Motion Control of Spacecraft Truss Driven by Synchronous V-gimbaled CMG Precession

The slewing motion control of a truss arm driven by a V-gimbaled control-moment-gyro (CMG) is a nonlinear control problem. The V-gimbaled CMG consists of a pair of gyros that must precess synchronously. The moment of inertia of the system, the angular momentum of the gyros and the external disturbances are not exactly known. With the help of feedback linearization and recursive Lyapunov design method, an adaptive nonlinear controller is designed to deal with the unknown items. Performance of the proposed controller is verified by simulation.     

An SOR Implicit Time-accurate Scheme in Calculating Unsteady Flows

A new time-accurate marching scheme for unsteady flow calculations is proposed in the present work. This method is the combination of classical Successive Over-Relaxation (SOR) iteration method and Jacobian matrix diagonally dominant splitting method of LUSGS. One advantage of this algorithm is the second-order accuracy because of no factorization error. Another advantage is the low computational cost because the Jacobian matrices and fluxes are only calculated once in each physical time step. And, the SOR algorithm has better convergence property than Gauss-Seidel. To investigate its accuracy and convergency, several unsteady flow computa- tional tests are carried out by using the proposed SOR algorithm. Roe’s FDS scheme is used to discritize the inviscid flux terms. Un- steady computational results of SOR are compared with the experiment results and those of Gauss-Seidel. Results reveal that the numerical results agree well with the experimental data and the second-order accuracy can be obtained as the Gauss-Seidel for unsteady flow computations. The impact of SOR factor is investigated for unsteady computations by using different SOR factors in this algorithm to simulate each computational test. Different numbers of inner iterations are needed to converge to the same criterion for different SOR factors and optimal choice of SOR factor can improve the computational efficiency greatly.