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Spacecraft formation reconfiguration with multi-obstacle avoidance under navigation and control uncertainties using adaptive artificial potential function method

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Astrodynamics 2020年第1期4卷 41-56页

作者： Yi Wang Xiaoqian Chen dechao ran Yong Zhao Yang Chen Yuzhu Bai College of Aerospace Science and Engineering National University of Defense TechnologyChangsha410073China National Innovation Institute of Defense Technology Chinese Academy of Military SciencesBeijing10071China

In this paper,an adaptive artificial potential function(AAPF)method is developed for spacecraft formation reconfiguration with multi-obstacle avoidance under navigation and control ***,an improved Linear Quadratic Regular(ILQR)is proposed to track the reference trajectory and a Lyapunov-based method is employed to demonstrate the stability of the overall closed-loop *** with the traditional APF method and the equal-collision-probability surface(ECPS)method,the AAPF method not only retains the advantages of APF method and ECPS method,such as low computational complexity,simple analytical control law and easy analytical validation progress,but also proposes a new APF to solve multi-obstacle avoidance problem considering the influence of the ***,the ILQR controller obtains high control accuracy to enhance the safe performance of the spacecraft formation ***,the effectiveness of the proposed AAPF method and the ILQR controller are verified by numerical simulations.

关键词： spacecraft formation flying spacecraft formation reconfiguration collision avoidance artificial potential function uncertainties

Adaptive Non-singular Terminal Fault-tolerant Control for Rigid Spacecraft Attitude Maneuver 36

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Adaptive Non-singular Terminal Fault-tolerant Control for Ri...

基于自适应二阶终端滑模的航天器有限时间姿态机动算法

第36届中国控制会议

作者： dechao ran Tao Sheng Yi Wang Xiaoqian Chen Ziyan Pang Yuzhu Bai College of Aerospace Science and Engineering National University of Defense Technology College of Basic Education for Commanding Officers National University of Defense Technology

ISBN: (纸本)9781538629185

In this paper,an adaptive non-singular terminal fault-tolerant controller has been designed for rigid spacecraft attitude *** proposed controller is based on the sliding mode *** adaptive learning algorithm is applied for the estimation of the *** non-singular terminal sliding surface is introduced to guarantee the system states converge to the desired states in finite *** simulation results state that the proposed fault tolerant controller is successful in achieving high control precision with finite time convergence.

关键词： attitude maneuver non-singular terminal sliding fault tolerant adaptive control actuator failure

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国防科技大学学报 2017年第1期39卷 6-10页

作者：冉德超倪庆绳涛陈小前国防科技大学航天科学与工程学院湖南长沙410073

针对航天器有限时间姿态机动问题,提出一种自适应二阶终端滑模控制算法。设计一种终端滑模面,保证系统状态能够在有限时间内沿滑模面收敛到系统原点;为克服系统抖振,设计了二阶终端滑模控制器,并采用参数自适应估计项补偿系统中的外部... 详细信息

针对航天器有限时间姿态机动问题,提出一种自适应二阶终端滑模控制算法。设计一种终端滑模面,保证系统状态能够在有限时间内沿滑模面收敛到系统原点;为克服系统抖振,设计了二阶终端滑模控制器,并采用参数自适应估计项补偿系统中的外部干扰力矩。基于Lyapunov函数法证明了二阶自适应终端滑模控制器能够保证闭环系统实际有限时间稳定。仿真结果表明,提出的姿态机动算法响应速度快、精度高,能够有效实现对系统抖振和外部干扰的抑制,具有重要的科学意义和工程应用价值。

关键词：航天器姿态机动二阶终端滑模有限时间控制自适应估计

青岛城市土壤重金属的形态分布及影响因素分析

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环境化学 2011年第3期30卷 652-657页

作者：钱翌张玮冉德超青岛科技大学环境与安全工程学院青岛266042 重庆工商大学环境与生物工程学院重庆400067

选取青岛市不同功能区63个代表性的表层土壤样品,分析了其重金属元素的含量和存在形态.结果表明,青岛城市土壤中Cu、Zn、Pb、Cd均受到不同程度的污染,其中Cd属于重度污染,土壤重金属累积污染程度为Cd>Zn>Cu>***和Zn主要以残渣态为主,Pb... 详细信息

选取青岛市不同功能区63个代表性的表层土壤样品,分析了其重金属元素的含量和存在形态.结果表明,青岛城市土壤中Cu、Zn、Pb、Cd均受到不同程度的污染,其中Cd属于重度污染,土壤重金属累积污染程度为Cd>Zn>Cu>***和Zn主要以残渣态为主,Pb主要以残渣态和铁锰氧化态为主,Cd主要以残渣态和有机结合态为主;土壤重金属总量和物理化学性质对各种化学形态重金属含量影响程度明显不同,通过逐步回归方法确定主要影响因子.

关键词：重金属含量形态逐步回归

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微纳卫星姿态确定与控制半实物仿真系统设计

国防科技大学学报 2016年第5期38卷 72-77页

作者：绳涛白玉铸何亮冉德超赵勇国防科技大学航天科学与工程学院湖南长沙410073

航天器姿态控制系统需要特殊的运行环境,在地面很难考核,这给系统可靠性带来一定的风险。针对微纳卫星的特点,设计并研制了一套面向微纳卫星的姿态确定与控制半实物仿真系统。该系统通过数字化模型模拟卫星姿态轨道运动、敏感器模型产... 详细信息

航天器姿态控制系统需要特殊的运行环境,在地面很难考核,这给系统可靠性带来一定的风险。针对微纳卫星的特点,设计并研制了一套面向微纳卫星的姿态确定与控制半实物仿真系统。该系统通过数字化模型模拟卫星姿态轨道运动、敏感器模型产生敏感器测量数据、执行器模型生成控制力矩、敏感器模拟器实现通信协议,最终实现姿态控制系统的全系统仿真。这套系统可以接入卫星控制系统回路,实现对姿控系统软件、硬件的考核,同时验证算法的性能。基于该系统,对天拓三号卫星姿控系统进行地面半实物仿真,并对比在轨试验数据,结果表明系统设计合理,仿真结果可信。

关键词：微纳卫星姿态控制系统半实物仿真天拓三号

铁、镧共掺杂纳米TiO_2可见光催化性能研究

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压电与声光 2012年第2期34卷 283-287页

作者：郝丽萌傅敏陈盛明冉德超皮俊敏重庆工商大学环境与生物工程学院重庆400067

通过溶胶-凝胶(Sol-Gel)法制备了铁、镧共掺杂纳米TiO2,采用X线衍射仪(XRD)、X线光电子能谱(XPS)、紫外-可见分光光度计(UV-Vis)和荧光分光光度计(FL)等测试手段对样品进行表征。结果表明,500℃煅烧后的掺杂TiO2均呈锐钛矿型,平均粒径为... 详细信息

通过溶胶-凝胶(Sol-Gel)法制备了铁、镧共掺杂纳米TiO2,采用X线衍射仪(XRD)、X线光电子能谱(XPS)、紫外-可见分光光度计(UV-Vis)和荧光分光光度计(FL)等测试手段对样品进行表征。结果表明,500℃煅烧后的掺杂TiO2均呈锐钛矿型,平均粒径为6.1nm,掺杂抑制了TiO2粒径的长大,掺杂的Fe3+、La3+能有效进入TiO2晶格。掺杂使TiO2的吸收带边红移且在可见光区的光吸收增强,样品的荧光强度越小,催化效果越好。可见光光催化降解甲基橙实验结果表明,可见光照射5h,最佳共掺杂的0.01%Fe/0.6%La-TiO2对甲基橙的降解率达40.7%。

关键词：溶胶-凝胶(Sol-Gel)法共掺杂 TiO2 可见光

High-temperature oxidation behavior and degradation mechanism of chromium-coated zirconium alloy cladding: a review

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Tungsten 2025年第1期7卷 50-70页

作者： Yi Li Bei-Qi Wang Xin-Yin Zhang Shi-Jie Wang Cong-Yi Li Hui-Long Yang ran-ran Su Tong Liu School of Mechanical Engineering Shanghai Jiao Tong University College and Graduate School of Arts and Sciences University of Virginia Global Institute of Future Technology Shanghai Jiao Tong University

Accident-tolerant fuels(ATF) have been extensively studied to reduce the production rate and total amount of heat and hydrogen generated from high-temperature steam oxidation during severe ***-coated zirconium alloy cladding has become one of the most promising candidates for ATF because of its excellent corrosion and oxidation *** paper provides a comprehensive overview of the research progress on oxidation behaviors and degradation mechanisms in chromium-coated zirconium alloy cladding under high-temperature *** techniques to strengthen the oxidation resistance are highlighted and ***,challenges and opportunities for various future directions are addressed.

关键词： Accident-tolerant fuel Chromium coating Degradation mechanism High-temperature oxidation behavior Zirconium alloy cladding

Micro-strain regulation strategy to stabilize perovskite lattice based on the categories and impact of strain on perovskite solar cells

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Journal of Energy Chemistry 2025年第1期100卷 578-604页

作者： Caixia Li Wenwu Liu Shiji Da Lingbin Kong Fen ran State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of Technology School of Materials Science and Engineering Lanzhou University of Technology

Photovoltaic metal halide perovskite solar cells(PSCs) convert light to electricity more efficiently than crystalline silicon cells, and the cost of materials used to make them is lower than that of silicon *** efficiency is not a core issue affecting the application of perovskite solar cells in special *** present, stability is the major technical encounters that hinders its further commercial development. Microstrain in PSCs is currently a significant factor responsible for the device's instability. Strain-induced ion migration is widely believed to accelerate perovskite degradation even when external stimuli are ***, it is imperative to study strain to enhance the stability of PSCs. This paper reviews recent developments to understand strain's origin and effect mechanisms on performance of PSCs, including ion migration,failure behavior, defect formation, and its effect on photoelectric properties, stability, and ***, several well-known strain management strategies are systematically introduced based on the strain effect mechanism and strain engineering on the film, providing more clues for further preparation with increased stability. The manipulation of external physical strain applied from films to entire devices has been extensively studied. Furthermore, recommendations for future research directions and chemical approaches have been provided. It is emphasized that strain engineering plays a crucial role in improving the efficiency and longevity of PSCs. Tensile strain causes rapid degradation, while moderate compressive strain and external strain control could improve properties and stability. Efforts should focus on controlling compressive strain to mitigate residual tensile strain and introducing it in a controlled manner. Future research endeavors may focus on exploring these pathways to improve the efficiency and lifespan of PSCs.

关键词： Halide perovskite solar cells Strain origins Strain effects Strain management

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济南市建筑垃圾处置管理展望

再生资源与循环经济 2022年第6期15卷 25-27页

作者：冉德超王宝华孟凯济南市渣土处置中心山东济南250002

分析了济南市建筑垃圾产生和处置现状,结合相关政策法规及建筑垃圾处置发展趋势,指出了济南市建筑垃圾处置管理存在问题,提出了建筑垃圾分类和资源化综合利用是必然的发展趋势,为今后济南市建筑垃圾的可持续发展管理提供支撑。

关键词：建筑垃圾管理全过程分类资源化