Standardisation of the graphical and operator input device modulesfor tactical command and control man/machine interfaces

Since many of the MMI systems designed for Tactical Command and Control operating environments are similar in nature, there is a need to standardise certain elements of the systems. This paper gives a summary of the investigation into standardising certain graphical MMI elements, and operator input device elements for Tactical Command and Control systems. This standardisation allows for rapid prototyping on low-cost platforms, as well as enabling the code to be transferred easily between different operating platforms     

支持向量机在航空结构声激励应力分析中的应用

支持向量机是一种新的机器学习方法。它以统计学习理论为基础,从结构风险最小化原则出发,具有很好的泛化及推广能力。通过采用支持向量机对飞机襟翼结构在声激励试验中获得的总应力、总加速度及总声压数据进行分类,分别获得结构响应间的线性关系和非线性关系的样本点以及线性与非线性界限。最后利用多元线性回归模型分别建立线性关系和非线性关系的仿真模型。研究表明,支持向量机在模式分类中具有良好的分类性能,在解决航空结构声疲劳问题中有较好的工程应用前景。     

powRgrip(R)给刀具注入了新力量

随着硬质合金刀具和高速切削给机床和工具带来的技术上的转变,机械零件生产厂商Deiken & Engels 现在为整个工厂装配了术自REGOFIX 的 powRgrip(R)刀柄夹持系统.在高速切削带来的极条件下,只有使用这套产自瑞上的刀柄系统,才能使钻头头和铣刀的径向跳动值达到最小值.现在,所有的生产人员都极其信赖这种创新的冷压刀柄夹持系统.     

Plasma Experiment for Planetary Exploration (PEPE)

The Plasma Experiment for Planetary Exploration (PEPE) flown on Deep Space 1 combines an ion mass spectrometer and an electron spectrometer in a single, low-resource instrument. Among its novel features PEPE incorporates an electrostatically swept field-of-view and a linear electric field time-of-flight mass spectrometer. A significant amount of effort went into developing six novel technologies that helped reduce instrument mass to 5.5 kg and average power to 9.6 W. PEPE’s performance was demonstrated successfully by extensive measurements made in the solar wind and during the DS1 encounter with Comet 19P/Borrelly in September 2001. P. Barker is deceased.     

片上网络的分析与设计

为了减小多处理器片上系统的面积和功耗,支持可靠的数据传输,提出了片上网络这种理想的解决方案,详细分析了片上网络的体系结构,拓扑结构及路由策略,比较了wormhole和hot potatol路由技术,提出了转发器的设计方案,并叙述了片上网络的发展前景.     

HexTOOL(R)的初步验证试验

要满足不同用户(特别是民用航空工业用户)对碳纤维制品的要求,生产商必须面对的一个挑战,就是在兼顾成本的同时制造出高质量的模具.     

hyperMILL(R)来自德国的CAM解决方案

奥德麦总部位于德国慕尼黑,其中国总部在上海,并在北京、成都、东莞设有分公司.奥奔麦科技(中国),秉承严谨务实的传统,将世界领先的CAM软件hyperMILL(R)和最先进的2D、3D以及五轴加工应用技术带到中国.针对客户的需求,并通过与世界级高端机床供应商的深入合作,提供给客户配合机床使用的整体解决方案.     

The Electric Field Instrument (EFI) for THEMIS

The design, performance, and on-orbit operation of the three-axis electric field instrument (EFI) for the NASA THEMIS mission is described. The 20 radial wire boom and 10 axial stacer boom antenna systems making up the EFI sensors on the five THEMIS spacecraft, along with their supporting electronics have been deployed and are operating successfully on-orbit without any mechanical or electrical failures since early 2007. The EFI provides for waveform and spectral three-axis measurements of the ambient electric field from DC up to 8 kHz, with a single, integral broadband channel extending up to 400 kHz. Individual sensor potentials are also measured, providing for on-board and ground-based estimation of spacecraft floating potential and high-resolution plasma density measurements. Individual antenna baselines are 50- and 40-m in the spin plane, and 6.9-m along the spin axis. The EFI has provided for critical observations supporting a clear and definitive understanding of the electrodynamics of both the boundaries of the terrestrial magnetosphere, as well as internal processes, such as relativistic particle acceleration and substorm dynamics. Such multi-point electric field observations are key for pushing forward the understanding of electrodynamics in space, in that without high-quality estimates of the electric field, the underlying electromagnetic processes involved in current sheets, reconnection, and wave-particle interactions may only be inferred, rather than measured, quantified, and used to discriminate between competing hypotheses regarding those processes.     

Doppler and direction-of-arrival (DDOA) radar for multiple-mover sensing

A low-cost two-element receiving array concept is investigated for detecting multiple moving targets in indoor surveillance applications. Conventional direction-of-arrival (DOA) detection requires the use of an antenna array with multiple elements. Here we investigate the use of only two elements in the receiver array. The concept entails resolving the Doppler frequencies of the returned signals from the moving targets, and then measuring the phase difference at each Doppler frequency component to calculate the DOA of the targets. Simulations are performed to demonstrate the concept and to asses the DOA errors for multiple movers. An experimental system is designed and constructed to test the concept. The system consists of a two-element receiver array operating at 2.4 GHz. Measurement results of human subjects in indoor environments are presented, including through-wall scenarios.     

Digital beam forming (DBF) antenna system for mobile communications

We demonstrate the feasibility of a digital beam forming (DBF) and beam space CMA (Constant Modulus Algorithm) adaptive array antenna by implementing a digital signal processor (DSP) in ASICs using field programmable gate arrays (FPGA), this DBF can synthesize 16 multi-beams and eliminate interference signals by CMA adaptive processing. The whole function was implemented in 10 DSPs about 127,000 equivalent gates. Simple experimental results have confirmed the basic function of the DBF and BSCMA adaptive array antenna     

对我国民航市场化的再认识(上)

从上世纪80年代至今,我国一直在深化改革中加速民航的市场化进程。但由于各种原因,民航目前仍处于市场化的初级阶段,很从问题有等探讨和解决。为总结前一阶段民航市场化的理论与实践,启发今后的改革和发展,本刊特邀民航资深政策研究人士,纵论民航市场化及相关话题     

对我国民航市场化的再认识(下)

市场化是我国民航发展的必经阶段,也是建设民航强国的惟一途径。在民航市场化的推进过程中,应充分发挥企业作为市场化主体的作用,根据实际情况分阶段逐步实施。同时,在判断民航市场化成功与否上,应从社会、行业、企业等多角度进行综合考察     

齿轮传动涡轮风扇(GTF)发动机先进技术综述

齿轮传动涡轮风扇（GTF）发动机采用的1套齿轮减速机构,在保证低压涡轮高速旋转的同时,能使风扇以理想的低速旋转,从而降低了发动机的噪声与油耗。概括性地介绍和分析了PW公司GTF发动机的研制背景、设计特点与采用的新技术。