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基于hp自适应伪谱法的组合动运载器发射窗口拓展能力分析 被引量:2
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作者 周宏宇 王小刚 +1 位作者 崔乃刚 许河川 《中国惯性技术学报》 EI CSCD 北大核心 2017年第6期828-833,共6页
传统运载火箭具有弹道横向调节能力有限、发射窗口固定等缺陷。针对这一问题,提出了一种水平起飞/着陆的组合动力运载器方案,其巡航段的横向机动能力可极大地拓宽发射窗口宽度。首先推导了组合动力运载器的数学模型,建立发射窗口宽度与... 传统运载火箭具有弹道横向调节能力有限、发射窗口固定等缺陷。针对这一问题,提出了一种水平起飞/着陆的组合动力运载器方案,其巡航段的横向机动能力可极大地拓宽发射窗口宽度。首先推导了组合动力运载器的数学模型,建立发射窗口宽度与运载器横向机动范围之间的映射关系。考虑到飞行环境的复杂性,动力系统性能与飞行状态密切耦合,采用hp自适应伪谱法对运载器飞行轨迹进行优化。该算法自动确定新增节点的数量和位置,并用增加多项式阶次的方法代替节点增加,避免了不必要的网格细化,构成的非线性规划问题规模更小,初值更易选择,求解速度更快。最后进行了数学仿真研究,验证了优化算法的有效性和对发射窗口的拓展能力。 展开更多
关键词 发射窗口 组合动力 巡航机动 hp自适应伪谱法 非线性规划
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Longitudinal and lateral slip control of autonomous wheeled mobile robot for trajectory tracking 被引量:2
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作者 Hamza KHAN Jamshed IQBAL +1 位作者 Khelifa BAIZID Teresa ZIELINSKA 《Frontiers of Information Technology & Electronic Engineering》 SCIE EI CSCD 2015年第2期166-172,共7页
This research formulates a path-following control problem subjected to wheel slippage and skid and solves it using a logic-based control scheme for a wheeled mobile robot (WMR). The novelty of the proposed scheme li... This research formulates a path-following control problem subjected to wheel slippage and skid and solves it using a logic-based control scheme for a wheeled mobile robot (WMR). The novelty of the proposed scheme lies in its methodology that considers both longitudinal and lateral slip components. Based on the derived slip model, the controller for longitudinal motion slip has been synthesized. Various control parameters have been studied to investigate their effects on the performance of the controller resulting in selection of their optimum values. The designed controller for lateral slip or skid is based on the proposed side friction model and skid check condition. Considering a car-like WMR, simulation results demonstrate the effectiveness of the proposed control scheme. The robot successfully followed the desired circular trajectory in the presence of wheel slippage and skid. This research finds its potential in various applications involving WMR navigation and control. 展开更多
关键词 Robot modeling Robot navigation Slip and skid control Wheeled mobile robots
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