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2041.高速铁路32m简支箱梁声辐射特性研究
[铁路、船舶、航空航天和其他运输设备制造业] [2013-11-15]
将列车-轨道-桥梁耦合振动理论与声辐射分析边界元法相结合,分析高速铁路32 m单箱单室和单箱双室箱梁声辐射特性.结果表明:单箱单室箱梁动力响应均大于单箱双室箱梁,2种截面梁型在10～100 Hz范围内振动密集,表现出结构局部振动特性,须采用板单元进行动力分析;箱梁结构噪声以低频为主,分布在小于250Hz频带内,适合采用边界元法求解;各场点声压级在梁底空间变化较小,距离每增加2 m,声压级平均降低1.2dB,越靠近地面,声压级衰减越小;各场点声压级随与桥梁中心线距离的增大而减小,距离每增加9 m,声压级平均降低3.7 dB;距桥梁中心线25 m处,各场点声压级随距地面高度增加而减小;行车速度为160～240 km/h时,单箱单室箱梁比单箱双室箱梁声压级平均大14.2～4.3 dB,速度越高,声压级差别越小.
关键词：高速铁路；箱梁；边界元法；振动；噪声
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2042.非惯性坐标在列车纵向力分析中的运用
[铁路、船舶、航空航天和其他运输设备制造业] [2013-11-15]
考虑车体与钩缓系统位移而造成的钩缓系统各部件间几何非线性特点,本文提出一种新的非线性列车车钩缓冲系统模型.忽略钩缓系统各部件惯性,将系统坐标分成惯性坐标和非惯性坐标:惯性坐标描述有惯性力作用其上的车体运动,与惯性力无关的非惯性坐标描述钩缓系统各部件的运动.在不增加状态方程数量、系统惯性坐标数量和约束方程数量的前提下,建立一个较为详细的钩缓系统模型,以体现系统各部件的运动自由度.本模型可在车体任意三维运动时捕捉钩缓系统各部位的运动自由度,而既有的简化钩缓系统模型则未能体现这一点.该方法还可避免由于过小质量的引入而带来系统微分方程组的刚性问题.最后,本文给出一个简化的列车模型算例来展示所述方法的运用.
关键词：纵向动力学；非惯性坐标；车钩力；车钩几何非线性；多体系统
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2043.考虑不同满轴约束的编组站阶段计划配流优化
[铁路、船舶、航空航天和其他运输设备制造业] [2013-11-15]
基于阶段计划列车解编顺序优化,同时考虑出发列车牵引质量及换长两个满轴约束,以车流接续与分配的“代价”最小为目标,构建编组站配流优化0-1整数规划模型,并设计与ILOG优化软件结合的和声搜索算法进行求解.其中配流结果使用ILOG求解,列车解编顺序则采用和声搜索策略进行优化.在构造新的和声过程中,采用邻域搜索策略提升算法的寻优效率.算例结果表明:提出的方法能获取鲁棒性更高的配流方案.
关键词：编组站；阶段计划；配流；和声搜索
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2044.基于图论和面向对象的列控数字轨道地图研究
[铁路、船舶、航空航天和其他运输设备制造业] [2013-11-15]
将全球定位系统(GPS)和地理信息系统(GIS)结合在一起应用于轨道交通中,可提高列车定位精度、减少轨旁设备、降低建设和维护成本.一份结构合理的数字轨道地图可以提高列车定位的实时性和准确性.本文主要研究数字轨道地图的模型、设计和验证.首先,结合拓扑关系数据模型和面向对象数据模型的优点,对数字轨道地图进行建模;基于图论和面向对象的数据结构的思想,利用空间数据和对象属性数据实现数字轨道地图的设计.其次,结合图的深度优先搜索算法,提出对数字轨道地图连通性、合理性和正确性进行验证的算法.最后,本文在VC++平台下实现数字轨道地图的功能,并采用丰沙线三家店车站现场采集的GPS数据对数字轨道地图进行实验验证.结果表明本文提出的设计方法是可行的.
关键词：数字轨道地图；列车定位；面向对象；图论；拓扑结构
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2045.基于频谱检测的短波认知用户性能优化
[铁路、船舶、航空航天和其他运输设备制造业] [2013-11-15]
为保证短波通信传输可靠性,改善短波通信质量,提高短波通信频谱利用率,本文以Watterson短波信道模型为基础,研究基于频谱检测的短波认知用户性能优化方法.首先建立短波授权用户的业务量指数分布通信模型,在此基础上求取衡量认知用户检测性能的检测门限、检测概率和虚警概率之间的关系.重点分析一定授权用户干扰容限下,认知用户系统吞吐量最优化问题,通过数值理论简化得到可控参数的最优化近似解.最后在理想信道、好信道、中等信道和差信道上,分别从检测时间、数据帧长和授权用户业务量对认知用户系统吞吐量的影响进行评估.仿真结果验证了基于频谱检测的短波通信系统中存在可控参数的最优解.
关键词：短波通信；认知无线电；频谱检测；能量检测；吞吐量
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2046.全球商用飞机室内照明市场报告（2012-2016年）
[电气机械和器材制造业,铁路、船舶、航空航天和其他运输设备制造业] [2013-10-31]
Landing lights are used in night landing operations by aircrafts. Position lights are also known as navigation lights. These lights are placed on the wingtip (red on left wingtip, green on right wing tip) and on the tail of the aircraft. Anti-collision lights illuminate the important parts of the aircraft. These lights are placed at the rudder (vertical tail of the aircraft), fuselage (body of the aircraft), and on the wingtip of the aircraft. A red beacon is used on the rudder whereas white strobes are used on the wingtips. Cockpit lights assist the pilots to view the important switches and instruments. Cabin lights are used to illuminate the aircraft cabin. Emergency lights include interior and exterior lights, which are battery powered. They are not directly connected to the main electrical system of the aircraft.
关键词：着陆灯；导航灯；防撞灯；机舱灯
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2047.全球无人机有效载荷市场报告（2012-2016年）
[铁路、船舶、航空航天和其他运输设备制造业] [2013-10-31]
A UAV payload includes the objects carried on a UAV which are used to make the UAV efficient and versatile. Electro-optic cameras that can take real-time video of objects in the visible light spectrum are an example of a UAV payload. UAV payload also includes lasers that provide light at night for viewing and targeting an object. SARs that use a single antenna to generate accurate radar imaging of target places, signal intelligence sensors used to locate, detect, and classify radio frequency transmissions, and electronic warfare equipment used to locate, detect, and classify radar emitters are some of the other examples of UAV payload. UAV payload is controlled by ground control units, which include command, control, communication, computers, and intelligence systems. Such units are used to collect data and make it available to different departments of the intelligence system of a country through integrated surface routers.
关键词：无人机；有效载荷；电光相机；UAV；信号情报传感器
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2048.全球无人机市场报告（2012-2016年）
[铁路、船舶、航空航天和其他运输设备制造业] [2013-10-30]
This report covers the present scenario and the growth prospects of the Global UAV market for the period 2012-2016. The market size is based on the sale of UAVs to the DODs of various countries. To calculate the market size, the report considers the revenue and unit sales of the different segments of the Global UAV market such as Mini-UAV, Small Tactical UAV, Tactical UAV, Naval UAV, MALE UAV, HALE UAV, Uninhabited Combat Air Vehicle, and Civil Small UAV. The report also presents the vendor landscape and a corresponding detailed analysis of the top four vendors in the Global UAV market. In addition, the report discusses the major drivers that influence the growth of the Global UAV market. It also outlines the challenges faced by the vendors and the market at large, as well as the key trends that are emerging in the market.
关键词：无人驾驶飞机；无人机；市场规模；挑战
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2049.铁路设备：招标启动拉动短期业绩增长长期关注城镇化带来投资机会
[铁路、船舶、航空航天和其他运输设备制造业] [2013-10-23]
本报告关注点：铁路货运能力与需求均有一倍以上的增长空间；高铁、城市轨道交通成为客运增长点；短期关注招标启动带来的业绩增长，长期把握城镇化投资机会。投资要点：供给和需求共同推动铁路货运快速发展；高铁和城轨建设共同拉动客运增长；第一次招标启动，拉动公司业绩增长。
关键词：铁路设备；招标；城镇化；投资
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2050.通过计算机模型识别方法以减少生产过程中的桥梁裂缝
[信息传输、软件和信息技术服务业,铁路、船舶、航空航天和其他运输设备制造业,建筑业] [2013-10-22]
The objectives of the study were to use finite element computer modeling to investigate the behavior of Wisconsin W wide-flanged prestressed girder ends during and immediately following the strand detensioning process, and to identify solutions for controlling girder end cracking by reducing concrete tension strain or introducing sufficient reinforcement to keep concrete tension strains low and crack width limited.
关键词：电子信息；计算机；模型识别；桥梁裂缝
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