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大型飞机荷载作用下SEA道面结构响应分析
SEA机场道面 A380-800飞机 结构响应 ANSYS Bisar
2019/4/16
利用Bisar及ANASYS建立新型环氧沥青混凝土道面（SEA）结构模型，通过分析A380-800飞机主起落架构造及多项荷载参数，对飞机荷载作用下SEA机场道面面层应力、应变及弯沉等结构响应进行分析，并拟合Bisar三阶差值三维弯沉图。结果表明，A380飞机荷载作用在SEA道面上时，A380飞机主起落架前六轮主要承受载荷，应力应变分布较为均匀，出现双峰值现象；后四轮纵向应力应变较横向大，易出现应力...
CHALLENGES IN OPERATIONS AND MAINTENANCE OF ANTARCTICA GROUND STATION FOR EARTH OBSERVATION SATELLITES
Data Reception system (DRS) Data Communication System (DCS) Payload (PLD) Telemetry and Tele-Command (TTC) Visible Orbits
2019/2/27
Remote sensing and Geographical Information System (GIS) through Earth Observation (EO) Satellites have become most important tools for many of the societal applications of day-to-day life, during the...
CLASSIFICATION OF THE STRUCTURE OF CITIES THROUGH MID-RESOLUTION SATELLITE IMAGERY AND PATCH BASED NEURAL NETWORKS
Convolutional Neural Networks (CNN) Autoencoders Sentinel 2B Indian Cities
2019/2/28
The studies in the classification of the urban spatial structure have been essential in deriving insights into the land cover and the built typology which helped in the estimation of energy consumptio...
EXTRACTION OF BLUE ICE AREA USING ALBEDO VALUE DERIVED FROM LANDSAT-8 SATELLITE DATA
Blue Ice Landsat-8 Albedo Polar record Glacier Image Processing
2019/2/28
Blue Ice Areas (BIAs) or bare ice areas are zones of glacier where surface mass balance is negative, sublimation forms the major ablation process and surface albedo is relatively small. Exceptionally ...
MULTI-SATELLITE OBSERVATION OF MEGH CYCLONE
Cyclone Megh RISAT-1 Synthetic aperture radar cloud microphysics Wind speed
2019/2/28
Cyclone Megh, a category-3 (Saffir-Simpson scale) cyclonic storm is regarded as the worst tropical cyclone to ever strike Yemen’s island of Socotra. In this paper, we aim to investigate the wind struc...
BUILDING FOOTPRINT EXTRACTION FROM HIGH RESOLUTION SATELLITE IMAGERY USING SEGMENTATION
Segmentation Building Extraction Multi-Resolution Algorithm Rule-Based Feature Extraction High Resolution Satellite Imagery
2019/2/27
Identification and mapping of urban features such as buildings and roads are an important task for cartographers and urban planners. High resolution satellite imagery supports the efficient extraction...
A WEB-BASED VIRTUAL LABORATORY FOR SATELLITE IMAGE PROCESSING AND ANALYSIS
Education Satellite Image Processing E-Learning Tool Web-based Virtual Laboratory
2019/2/27
With continuous increase in the utilization of satellite images in various engineering and science fields, it is imperative to equip students with additional educational aid in subject of satellite im...
ROAD NETWORK IDENTIFICATION AND EXTRACTION IN SATELLITE IMAGERY USING OTSU'S METHOD AND CONNECTED COMPONENT ANALYSIS
Road identification road extraction Otsu's method connected component analysis morphological operations
2019/2/27
As the high resolution satellite images have become easily available, this has motivated researchers for searching advanced methods for object detection and extraction from satellite images. Roads are...
奇异摄动被广泛应用于求取力学问题的近似解.一个典型问题就是流体力学中的边界层.郭永怀先生曾发展了适用于平板黏性流动边界层问题的奇异摄动理论.类似于流体力学中的边界层,燃烧研究中的层流预混火焰也可以通过奇异摄动理论进行分析,在燃烧研究中通常称其为大活化能渐近分析.本文介绍了大活化能渐近分析在一维平面预混火焰和球形传播火焰中的应用及相关研究进展.首先介绍了预混火焰结构及其涉及的不同特征尺度,分析了大活...
针对新一代战斗机超声速内埋武器弹射投放分离安全性问题,采用高速风洞投放实验技术研究内埋武器从开式武器舱弹射投放分离动态运动过程,风洞投放模型试验过程中采用除垂直加速度不足外,其余全部运动严格相似的轻模型相似设计方法,并针对轻模型法垂直加速度不足所导致的投放垂直位移偏离实物位移问题,采用一种简单易行的公式修正法进行补偿,试验给出了不同初始弹射投放分离条件下,内埋武器从载机投放分离后运动轨迹与姿态角随...
纳秒脉冲激光具有峰值功率密度高、易于击穿空气形成等离子体这一突出优势,在降低超声速波阻方面具有重要应用价值.以深刻揭示减阻机理为目的,针对激光与正激波相互作用这一基本物理现象开展实验研究.发展高精度纹影技术以测量复杂激波结构,时间分辨率达到 30ns,空间分辨率达到 1mm;搭建快速~PIV 实验系统以定量测量流场速度和涡量,时间分辨率达到 500ns.探明了激光等离子体引致的球面激波和高温低密度...
EXTRACTION OF BUILT-UP AREA USING HIGH RESOLUTION SENTINEL-2A AND GOOGLE SATELLITE IMAGERY
Built-up area Extraction Normalized Difference Index High Resolution Satellite Imagery Sentinel-2A Google Satellite Imagery
2018/11/9
Accurate information about the built-up area in a city or town is essential for urban planners for proper planning of urban infrastructure facilities and other basic amenities. The normalized differen...
ASSESSMENT OF SEASONAL VARIABILITY FOR WIND SPEED AND SIGNIFICANT WAVE HEIGHT USING SATELLITE ALTIMETER OVER MALAYSIAN SEAS
Wind speed significant wave height Seasonal variations Satellite Altimeter Radar Altimeter Database System Monsoons
2018/11/9
Malaysia is located in the equatorial region and experienced climate hot, humid and rainy throughout the year. These have brought four monsoon seasons to Malaysia which can be categorised as Northeast...
基于孔径分割的相控阵雷达认知成像调度算法
相控阵雷达 资源调度 孔径分割 认知成像
2019/4/17
在相控阵雷达资源调度研究领域，关于时间资源的分配已较为成熟，然而对于孔径资源的分配方面尚有待深入研究。针对相控阵雷达成像任务的调度问题，提出了一种基于孔径分割的多目标认知成像调度算法。首先对目标的回波特征进行认知，计算出目标成像所需占用的时间资源、孔径资源及综合威胁度；然后根据反馈信息，对多个成像任务进行合理调度；最后利用基于压缩感知的稀疏孔径ISAR成像方法对各个目标进行成像，实现多个任务在孔径...
以主动雷达弹对抗为背景，研究了单平台机载电子对抗资源的调度问题。为解决导弹导引头状态观测不确定性问题，引入部分可观测马尔科夫决策过程（POMDP）理论，分析了POMDP模型的要素，建立了针对主动雷达制导导弹的干扰资源优化POMDP模型，并利用最优策略可达空间的连续近似法（SARSOP）进行求解。将电子支援措施（ESM）的观测值输出与电子干扰措施（ECM）的优化策略相结合，提出了一种基于POMDP的...