小型螺旋桨飞机适航噪声测试与评定程序研究

针对我国民机噪声适航起步晚、适航审定技术与欧美国家存在差距等问题，以小型螺旋桨飞机为研究对象，开展适航审定技术研究，梳理噪声测量试验中涉及的基准条件计算、飞行试验技术、数据处理修正等方法，形成适航噪声测试与评定程序，满足中国民用航空规章第36部《航空器型号和适航合格审定噪声规定》（CCAR-36部）的相关技术要求。将该程序应用于某小型螺旋桨飞机噪声适航审定，结果表明该程序合理可行，计算得到的某小型螺旋桨飞机适航审定平均噪声级和90%置信限均满足要求。     

民机试飞空地一体化综合监控网络系统技术研究

以ARJ21适航审定试飞工程为背景,针对民机适航审定试飞的需求和测试特点,从优化系统架构和平衡系统性能等方面,对机载和地面各系统关键技术进行了分析。解决了新型多路网络化数据采集对机载和地面综合监控带来的一系列问题。提出了一套适合民机适航审定试飞的空地一体化综合监控网络系统解决方案。经过飞行试验证明,完全能够满足适航审定试飞空地一体化综合监控的要求,为今后大型飞机试飞测试及综合监控方法的研究提供了借鉴。     

通用飞机机载设备适航审定过程及方法研究

针对民用航空器机载设备适航审定的要求,文中结合海鸥300飞机航电系统与适航审定结合的开发过程,详细论述了通用飞机机载设备适航审定的过程及方法。所介绍的适航审定流程,即审定基础、审定计划和符合性验证等阶段的主要工作内容,尤其是设计符合性验证制造符合性验证方法,具有一定的普适性,可作为我国通用飞机机载设备适航审定的通用方法。     

显示和机组告警系统适航审定方法研究

与多个机载系统存在任务交联的特点以及平视显示系统等新技术的应用,给显示和机组告警系统的适航审定带来挑战。分析显示和机组告警系统的适航文件体系,给出审定基础、符合性方法确定原则,以及与其他系统的符合性验证交联关系,并从实际审查角度给出显示和机组告警系统的审定要素和评审要求。本研究可为民机机载显示和机组告警系统的适航审定与设计提供支持。     

小型无人机飞行控制系统设计

飞行控制系统作为无人机的核心，对无人机的性能具有决定性的影响。本文是论述一种小型无人机飞行控制系统的基本设计方法，首先介绍了小型无人机飞控系统的基本功能及组成，其后对飞行控制回路、飞行控制模态等问题分别进行了详细介绍，最后完成了该控制系统的数字仿真。     

COTS IP适航审定技术研究

机载电子硬件承担的系统功能越来越多,基于成本考虑,使用COTS IP成为一种趋势,也为适航审定带来挑战。首先分析了COTS IP在机载电子硬件设计中的使用位置及带来的风险,研究了当前适航审查需求,然后依据局方文件和审定经验提出了建议的评估过程,并总结适航审查要素。研究成果有助于解决COTS IP的适航审定问题,为现有机载电子硬件设计保证方法提供参考。     

多旋翼飞行器的非线性严格反馈制导控制系统设计

多旋翼飞行器的制导控制系统设计是保障飞行器的稳定性惯性制导飞行的关键技术,针对当前的多模制导控制方法的稳定性不好的问题,提出一种基于非线性严格反馈的多旋翼飞行器制导控制系统设计方法.系统设计主要包括了控制算法设计和系统的硬件模块化设计两大部分,设计非线性严格反馈控制方法提高飞行器的控制品质和稳定性,对多旋翼飞行器制导控制系统的感知系统、驱动器模块、控制中心单元和执行器模块进行集成设计,数字信号处理器选用的TMS320VC5509A作为核心控制芯片,进行系统的硬件模块化设计与实现.最后进行系统的调试,实验结果表明,采用该系统进行多旋翼飞行器的制导控制,具有较好的控制信号调制解调性能,控制信息的反馈跟踪性能较好,保障了飞行的稳定性和制导精确性.     

进阶式飞行器控制实验项目设计与实现

飞行器控制系统是一个多输入多输出的复杂非线性系统，为使学生掌握相关控制理论，建立系统工程思想，采用进阶式教学方法设计并开展飞行器控制实验项目。从飞行器建模、机载传感器数据获取与处理、控制器设计、飞行实验验证等环节逐层递进，同时采用虚拟仿真与Pixhawk飞控硬件虚实结合的实验手段，进行飞控系统飞行效果的实验验证。     

四旋翼飞行器的容错姿态稳定控制

在近十年间, 飞行系统的可靠性问题得到了飞行控制领域越来越多的重视。以一种全新的垂直起降飞行器——四旋翼飞行器作为研究对象, 设计具有高可靠性的姿态稳定控制系统, 为了补偿执行机构发生故障给飞行控制品质带来的影响, 一种主动容错技术将被应用于姿态控制系统的设计中, 主要设计了一个基于状态观测器技术的鲁棒故障检测环节与一个可容错重构的姿态控制器, 在设计控制系统的同时, 还对于故障检测的鲁棒性与快速性、重构控制系统的稳定性进行了理论分析。最后通过数值仿真, 对容错控制系统中各个环节的效果进行了验证。     

基于简单自适应控制的鲁棒飞行控制律设计

为了提高飞行控制系统的鲁棒性和抗干扰性能,提出一种基于简单自适应控制的飞行控制律设计方法。根据简单自适应控制应用条件,需要保证飞行控制系统满足正实性的要求,为此引入并联前馈补偿器,将其转化为同时镇定问题,并利用YALM IP工具箱对相应的线性矩阵不等式进行求解;在PI调节律中引入了对误差的积分项以更好地抑制外部扰动;以某型飞机侧向飞行控制系统为例,针对系统参数摄动和承受有界干扰情况,对所提出的方法进行了仿真分析与验证。结果表明利用该方法设计的飞行控制系统在跟踪参考输入信号时具有较好的自适应跟踪性能和鲁棒性能。     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks     

Call for Papers—Feature Topic,Vol.12,No.7,2015

正Information Centric Networking Information-Centric Networking(ICN) is an emerging direction in Future Internet architecture research,gaining significant tractions among academia and industry.Aiming to replace the conventional host-to-host communication model by a data-centric model,ICN treats data content as the first     

JOURNAL OF ELECTRONICS(CHINA)

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NEXT GENERATION WIRELESS NETWORKS–ESPECIALLY THE USE OF MILLI-MICROWAVE BANDS

The global bandwidth shortage of wireless communications has motivated the exploration of the naillimeter wave （ram-wave） frequency spectrum for the next generation wireless communications. Recent advances in RF CMOS technology and high speed baseband signal processing technologies have enabled tile extensive research and development of turn-wave wireless communications. The multi gigabit per second data rate of ram-wave system will lead to applications in many important scenarios, such as WPAN, WLAN,back-haul for cellular system. And the frequency bands include 28 GHz, 38 GHz, 45GHz, 60GHz, E-BAND and even beyond 100 GHz. The propagation and the imitation of the RF circuits design in these frequency bands make the directional antennas be inevitable for mm-wave communications.