低成本航空公司对维修业的影响

低成本航空公司的日渐繁荣,给航空维修业带来的既是机遇又是挑战。众所周知,低成本航空公司(LCC)的机队规模通常较小,机队的售后服务市场相对简单,而且多数是航空公司自给自足。而现在,低成本航空公司的规模经济似乎为MRO供应商带来了发展机会。     

民用飞机机体维修企业排行榜

世界航空维修企业在上一个市场周期中触底反弹，获得相对成功。开业和停业、发展和停滞、战略转移和联合重组等因素，对维修市场产生较大的影响。     

Modeling Piecewise-Linear Systems by Topological Techniques

Flowgraph techniques are extended to systems with piecewise-linear characteristics by developing criteria for construction of an optimum model from related subregions in which linearity holds. This requires the synthesis of several known techniques and results in a wide range of useful applications including: 1) devices with nonlinear characteristics which may be considered as linear over certain subregions; 2) networks whose response to changes in applied signal frequency or magnitude may be approximated by piecewise-linear asymptotes; 3) systems processing two or more signals simultaneously with different transfer or immitance characteristics for each signal; 4) circuits approximated by different equivalent circuits depending on the numerical values of critical parameters. Representative examples will illustrate these and similar applications. Procedures are presented to provide a logical, orderly, and effective approach to construct a model, to determine figures of merit, and to optimize the model for a prescribed region of operation or for a desired range of parameters.     

全球十大机体维修供应商

相据O＆M杂志的最新调查,新加坡科技宇航公司在2008年以800余万工时数继续位居全球十大机体维修供应商的榜首.但其他公司的排名却发生了较大的变化.     

Electrical power distribution on space based radar satellites

The radar payload on a space-based radar (SBR) satellite could require tens of kilowatts of power distributed to many small loads over a large area. This poses special problems for the power distribution and control system (PDCS). A study that examined the power requirements of an SBR spacecraft is reported. A baseline prime power system, generating about 30 kW, was derived. The proposed distribution network would transmit 240 V at 20 kHz. The voltage would be downconverted in one converter for about 100 transmit/receive modules. The design considerations are discussed, and the baseline PDCS is described     

普惠静洁发动机售后服务计划

今年4月，普惠公司在航空周刊举办的MRO2011会展上，正式推出了针对静洁动力PW1000G的PureSolution计划。该计划进一步增加了普惠公司拓展售后服务市场的战略。普惠公司把自己定位为OEMRO，是能够对产品提供设计和诊断服务的制造商。PW1000G是普惠公司近年来推出的首款全新的发动机。     

窄体飞机C检

受窄体飞机需求增长,全球C检业务呈增长趋势。C检是指飞机每18～24个月所需执行的为期3～5天的机体结构维修。近年来,全球范围内的飞机C检正随着机队的增长呈上升趋势。根据MRO Prospector统     

创新型“蓝弧”技术

众所周知，航空发动机的工作环境非常苛刻，作为其中的重要部件之一，叶盘更是需要长期工作在1500℃左右的高温高压环境中，所以该部件通常采用铬镍铁高温合金Inconel718制造，但依靠传统的计算机数控机床对其进行加工，     

Traverses for the ISECG-GER design reference mission for humans on the lunar surface

This study explores the Design Reference Mission (DRM) architecture developed by Hufenbach et al. (2015) as a prelude to the release of the 2018 Global Exploration Roadmap (GER) developed by the International Space Exploration Coordination Group (ISECG). The focus of this study is the exploration of the south polar region of the Moon, a region that has not been visited by any human missions, yet exhibits a multitude of scientifically important locations – the investigation of which will address long standing questions in lunar research. This DRM architecture involves five landing sites (Malapert massif, South Pole/Shackleton crater, Schrödinger basin, Antoniadi crater, and the South Pole-Aitken basin center), to be visited in sequential years by crew, beginning in 2028. Two Lunar Electric Rovers (LER) are proposed to be tele-robotically operated between sites to rendez-vous with crew at the time of the next landing. With engineering parameters in mind we explore the feasibility of tele-robotic operation of these LERs between lunar landing sites, and identify potential high interest sampling locations en-route. Additionally, in-depth sample collection and return traverses are identified for each individual landing site across key geologic terrains that also detail crew Extra-Vehicular Activity (EVA). Exploration at and between landing sites is designed to address a suite of National Research Council (2007) scientific concepts.     

碳刹车在波音737机队的应用

<正>碳刹车可以为航空公司节省运营成本,但在实际应用中需要考虑其后勤保障问题。碳刹车因为更轻的重量和更长的寿命期可以节省成本,由此吸引了一些航空公司在其运营的波音737NG改装了碳刹车装置。