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嘉绍大桥索塔钢锚箱安装控制技术研究 被引量:3
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作者 贾少敏 赵雷 吴小鹏 《中外公路》 北大核心 2014年第2期133-138,共6页
嘉绍跨江大桥斜拉索塔端锚固采用钢锚箱-混凝土组合结构。由于6个塔中钢锚箱均位于130m以上高空,安装时因受风、温度等因素影响,保证其现场安装精度难度很大。嘉绍大桥钢锚箱安装时,基于几何控制法的理念,采用文中所述的"简化棱镜... 嘉绍跨江大桥斜拉索塔端锚固采用钢锚箱-混凝土组合结构。由于6个塔中钢锚箱均位于130m以上高空,安装时因受风、温度等因素影响,保证其现场安装精度难度很大。嘉绍大桥钢锚箱安装时,基于几何控制法的理念,采用文中所述的"简化棱镜追踪法"对首节钢锚箱进行放样测量,确保其精确调整到位;采用"相对位置控制法"对其余钢锚箱节段进行安装控制,且该方法可大幅减小温度及风的影响。钢锚箱施工完成后实测数据表明:各节钢锚箱的安装垂直度、安装高程、锚点坐标及索塔塔偏均满足相关精度要求。 展开更多
关键词 嘉绍跨江大桥 斜拉桥 索塔 钢锚箱 几何控制 相对位置控制法
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Following Control for a UUV using Temporary Path Generation Guidance 被引量:2
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作者 Zheping Yan Dongnan Chi Jiajia Zhou Yufei Zhao 《Journal of Marine Science and Application》 2012年第2期236-243,共8页
A path following control algorithm for an unmanned underwater vehicle(UUV) using temporary path generation guidance was proposed in this paper.Owing to different initial states of the vehicle,such as position and or... A path following control algorithm for an unmanned underwater vehicle(UUV) using temporary path generation guidance was proposed in this paper.Owing to different initial states of the vehicle,such as position and orientation,the path following control in the horizontal plane may yield a poor performance.To deal with the negative effect induced by initial states,a temporary path generation was presented based on the relationship between the original reference path and the vehicle’s initial states.With different relative positions between the vehicle and reference path,including out of straight lines,as well as inside and outside a circle,the related temporary paths guiding the vehicle to the reference path were able to be generated in real time.The vehicle was guided to steer along the temporary path until it reached the tangent point at the reference path,where the controller was designed using the input-output feedback linearization method.Simulation results demonstrated that the proposed algorithm is effective under the three different situations mentioned above. 展开更多
关键词 nonlinear control path following control UUV temporary path generation input-output feedback linearization
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