基于HIS模式的机载彩色告警板状态识别

传统的机载大型彩色告警板指示灯识别采用的方法是对图像先二值化处理再进行模板匹配.该方法准确率低、系统响应时间长.基于HIS模式提出一种识别方法.该方法首先在HIS彩色空间内分析图像,然后根据子块的颜色对图像进行分块,最后进行模板匹配识别各指示灯状态.通过仿真实验验证,采用基于HIS模式的识别方法可以准确识别微弱信号下的指示灯状态,满足实时监控的需要.     

一种车载开关电源的设计

本文针对一种列车车载电源的需求,设计了DC-DC开关电源。主电路采用推挽变换电路的工作原理,控制电路采用SG525A双端输出驱动MOS功率管电路。     

Response and fatigue assessment of high speed aluminium hulls using short-term wireless hull monitoring

This paper proposes a wireless hull monitoring system that is quick to install as a short-term monitoring solution. Hull measurements have the potential to increase the accuracy of ship response predictions at a lower cost than computer simulation or towing tank models. The performance of the wireless monitoring system is validated on the all-aluminium United States Coast Guard Response Boat-Medium. The system is designed to measure ship motions and hull strain responses during high-speed operations and in harsh weather conditions. An analytical framework is developed to extract sea states from inertial measurements recorded at the ship centre-of-gravity and in a bow compartment. To assess the fatigue life of the hull during harsh weather operations, response amplitude operators (RAOs) are empirically derived to map sea states to root mean square accelerations and strain cycles measured from a high-stress hull element. A RAO that maps sea state to consumed fatigue in the hull, so termed a consumed fatigue operator (CFO), is presented which can assist in the management of an asset over its life cycle. The study reveals reliable hull monitoring during a one-week sea trial. RAO and CFO fit to hull response data are proven to provide accurate estimates.     

3kW车载充电机的研究与实现

电动汽车以其显著的节能减排优势成为全球汽车工业的主要发展方向之一。车载充电机是电动汽车的重要组成部分,作为电动汽车动力电池与电网之间的接口,高效率是其最重要的技术指标,同时还应减小其对电网的谐波污染。设计的车载充电机采用AC/DC到DC/DC的两级隔离式电路结构:前级采用基于单周期控制的单相Boost-APFC电路,后级是移相全桥ZVZCS变换器,同时副边辅助电路采用由电容和二极管组成的新拓扑结构,可以进一步提高系统效率。另外,提出单-双环充电切换的控制方法,来满足蓄电池的恒压-恒流充电要求。为验证理论分析的正确性,在Matlab/Simulink环境下对整个系统进行仿真,并采用TMS320F2812控制芯片完成3 k W的样机实验。     

Comparative study of switching methods for the on-board processor in a mobile satellite communications system

An on-board processor makes efficient use of the channel capacities in a satellite communications system employing multibeam technology, and an on-board processor has been developed for the Engineering Test Satellite VIII (ETS-VIII), which is the experimental satellite for a multibeam mobile satellite communications system. The multicarrier time division multiple access (MC-TDMA) system used in this communications system, however, sometimes causes internal congestion in the on-board processor. This paper describes the results of computer simulation studies of the traffic capacity obtained using three baseband switching methods and also describes the results of studies of the on-board processor design for each of the methods. The computer simulation results indicate that the probability of internal congestion due to the TDMA system is very small when the simultaneous-slot switching method is used, and the design study results reveal that an on-board processor using the simultaneous-slot switching method will be compact and lightweight and will consume little power. © 1998 John Wiley & Sons, Ltd.     

民用飞机特殊座椅设计研究

根据民航业相关的设计标准,结合现有的部分优秀设计产品展开分析,希望在民用飞机设计与工业设计的有效契合中,对儿童、残障人员这类特殊人群,在空中旅行中的专用设施的设计得到一些启示和发现。     

基于视觉测量的智能轮椅床自动对接

为了提高智能轮椅床系统对接的自主性,提出了一种基于视觉测量的自动对接架构。轮椅床对接过程分为远程导引阶段和近程对接阶段。在远程导引阶段,室内天花板视觉系统采集并识别轮椅上的新型人工标志,利用卡尔曼滤波(KF)的跟踪检测路标特征,继而采用P3P的视觉定位方法确定路标与相机的相对位姿,根据轮椅坐标系与远程阶段的世界坐标系的变换关系确定轮椅的姿态。在近程对接阶段,车载单目视觉系统采集对接目标的引导标志,利用引导标志的角点估计轮椅与床的相对位姿,最后根据实时的视觉反馈实现床椅的自动对接。多次实验结果表明所提出的视觉对接方法具有可行性和有效性。     

应用于微型航天器的微型核技术

根据微型核定义开发了一套演示验证系统,它将星载计算机、姿态控制系统和通信子系统集成到一个被称为信息处理单元(IPU)的黑盒子中;IPU通过CAN总线连接微敏感器,包括星敏感器、太阳敏感器、磁强计、光纤陀螺以及GPS接收机。IPU尺寸为200 mm×28 mm×138 mm,净重为640 g,整个系统重量小于5.5 kg。利用作者开发的包括地面站系统和执行机构(反作用飞轮和磁力矩器)的航天器测试平台实现了微型核的自主姿态控制。     

光学传感器星上定标漫射板空间稳定性测试与分析

对光学传感器星上定标漫射板进行了研究,考查其在航天环境下的稳定性和适应性.漫射板经振动冲击、高低温循环、热真空和紫外辐照等系列环境模拟试验仍然保持良好的光学特性;紫外辐照前后其在350 nm处的反射率衰变不超过3%,分析认为这种紫外辐照下的反射率衰变是由于污染所致,通过改进工艺和环境控制是可以消除的;同时,漫射板通过了空间力学环境试验.研制的星上定标漫射板的空间稳定性能够满足航天应用要求.     

面向星载计算机的容错并行算法设计与实现

星载计算机是卫星进行星务管理和有效载荷计算的核心设备,由于要高速处理大量数据所以采用多处理器并行处理。但在空间运行期间,星载计算机设备一直处于宇宙空间带电粒子构成的辐射环境中,强辐射会造成星载计算机出现瞬时故障而影响卫星业务的正常运行。本文通过应用级软件容错的手段提高系统的可靠性,基于并行复算的思想,提出容错并行算法。通过对(NPB)基准测试程序修改,使其在VxWorks提供的Socket通信接口下实现相应的容错并行算法,并在VxWorks Simulator以及星载平台上进了正确性测试。