共查询到20条相似文献,搜索用时 125 毫秒
1.
2.
3.
4.
以福州市影像地图集为例,简要介绍图集的设计思路、流程优化及实现手段.包括:图集开本、影像图比例尺、内容编排,数字正射影像纠正、色彩处理、构面处理等. 相似文献
5.
与传统的二维图像信息相比,物体的三维彩色信息能够更加全面的、真实的反映客观物体。本文通过对成像激光雷达图像的分析,利用摄像机的针孔模型,获取成像激光雷达图像与摄像机图像对应点的对应关系,实现了三维图像与二维图像的融合。 相似文献
6.
随着中国北斗卫星系统的逐步完善,测绘装备及技术的发展,以及无人机航摄测量技术在各行业各领域发挥的作用越来越大,矿山企业通过建立地面沉陷观测站,利用全站仪等设备采集、分析数据。传统的观测手段受山地、丘陵和一些复杂地形的制约,通视要求较高,加之野外作业困难及人员不足等,不能满足实际需求。基于无人机不受地形影响及采集数据直观等优点,2018年公司购进精灵系列测绘无人机,逐步开展了无人机在矿山沉陷观测中的应用研究。 相似文献
7.
8.
针对国内外现有塔式太阳能热发电站中存在的无法全自动化清洗定日镜的问题,提出了一种基于二维激光雷达的定日镜清洗车导航避障系统,该系统由清洗车导航系统和激光雷达系统结合而成,利用激光雷达来测量前方定日镜的姿态,从而为清洗车导航系统提供避障保护,以实现清洗车对定日镜的全自动化清洗。首先,建立了地面导航系统坐标系,推导了WGS84坐标系到当地导航系统椭球坐标系的转换方程;其次,分别建立了定日镜、清洗车、激光雷达的运动学模型,并将清洗车和定日镜分别置于多种姿态,截取激光雷达的检测数据,使用检测数据标定激光雷达的安装位置,即激光雷达相对于车辆中心的坐标和安装倾角;最后,对定日镜清洗车导航避障系统进行实际测试,使用标定参数来检测前方定日镜的姿态,实现定日镜的全自动化清洗,当该导航避障系统反馈前方定日镜为异常姿态时,制动清洗车。该导航避障系统还可应用于与自动清洗系统相关的类似应用场景。 相似文献
9.
光伏组件自身缺陷是影响光伏电站发电量的重要因素,由于单块光伏组件运行状况无法进行实时监测,同时又不易被人工巡检发现,因此,本文提出利用无人机搭载双光相机(包括可见光镜头和红外热成像镜头)对光伏电站中的光伏组件区域进行自动化巡检,配合图像自动识别技术及时发现存在问题的光伏组件,提高故障消缺效率。以40 MW地面光伏电站为例进行对比分析后发现,单架无人机8 h可完成1次巡检,而两个巡检人员每天工作10 h仍需4~5天才能完成1次巡检,由此可知,无人机自动化巡检相较人工巡检效率提高了90%以上。 相似文献
10.
为解决传统电力系统巡检效率慢、巡检精度差的问题,提出基于云端控制协同的无人机自动驾驶智能巡检技术。搭建云端控制协同平台,云服务器通过内网接入智能巡检系统,设计无人机巡检多线程定位模块,通过PC端接收图像坐标模块的坐标信息,显示模块通过云平台实现数据共享;划分图像中心点坐标并标记,利用高斯核函数提升像素分布集中程度;最后拟定无人机悬停点,通过云端控制协同平台判断所获得的巡检路线图像是否存在异常,实现自动驾驶智能巡检作业。实验证明:所提方法能够精确识别初始图像像素点为574×574的图像的边缘;巡检航线水平误差最大值为0.5 m,垂直误差最大值为1 m,且巡检航线的运动未出现偏离或者抖动现象。为实现电网可靠、安全的运行提供了一定的技术支持。 相似文献
11.
12.
13.
14.
15.
《International Journal of Hydrogen Energy》2004,29(12):1277-1288
Modern utility-scale wind turbine towers are typically conical steel structures that could also be used to store gaseous hydrogen in what we have termed a hydrogen tower. This paper examines potential technical barriers to this technology and identifies a minimum cost design.We discovered that hydrogen towers have a “crossover pressure” at which the critical mode of failure crosses over from fatigue to bursting. The crossover pressure for many turbine towers is between 1.0 and (approximately 10–). The hydrogen tower design resulting in the least expensive hydrogen storage uses all of the available volume for storage and is designed at its crossover pressure. An 84-m tall hydrogen tower for a 1.5-MW turbine would cost an additional $83,000 (beyond the cost of the conventional tower) and would store of hydrogen at of pressure. The resulting incremental storage cost of $88/kg is approximately 30% of that for conventional pressure vessels. 相似文献
16.
17.
18.
Christian Santoni Kenneth Carrasquillo Isnardo Arenas‐Navarro Stefano Leonardi 《风能》2017,20(12):1927-1939
Large eddy simulations (LES) of the flow past a wind turbine with and without tower and nacelle have been performed at 2 tip speed ratios (TSR, ), λ=3 and 6, where the latter corresponds to design conditions. The turbine model is placed in a virtual wind tunnel to reproduce the “Blind test 1” experiment performed at the Norwegian University of Science and Technology (NTNU) closed‐loop wind tunnel. The wind turbine was modeled using the actuator line model for the rotor blades and the immersed boundary method for the tower and nacelle. The aim of the paper is to highlight the impact of tower and nacelle on the turbine wake. Therefore, a second set of simulations with the rotating blades only (neglecting the tower and nacelle) has been performed as reference. Present results are compared with the experimental measurements made at NTNU and numerical simulations available in the literature. The tower and nacelle not only produce a velocity deficit in the wake but they also affect the turbulent kinetic energy and the fluxes. The wake of the tower interacts with that generated by the turbine blades promoting the breakdown of the tip vortex and increasing the mean kinetic energy flux into the wake. When tower and nacelle are modeled in the numerical simulations, results improve significantly both in the near wake and in the far wake. 相似文献
19.
20.
以金沙江下游白鹤滩水电站拟建升船机工程为例,运用大型有限元分析软件ABAQUS建立包括顶部机房在内的超高扬程升船机塔柱结构模型,采用动力时程法分析了地震作用下塔柱顶部机房的鞭梢效应,并探讨了机房结构布置型式对鞭梢效应的影响。结果表明,塔柱结构前10阶振型以横河向振动、扭转振动和顺河向振动为主;地震作用下顶部机房的动力响应远大于主体塔柱结构;机房的结构布置型式对鞭梢效应影响较大;当主体塔柱和顶部机房结构的刚度和质量差异过大时,顶部机房的鞭梢效应对主体塔柱动力响应的影响较小。 相似文献