In order to solve the problems of dynamic modeling and complicated parameters identification of trajectory tracking control of the quadrotor,a data driven model-free adaptive control method based on the improved slidi...In order to solve the problems of dynamic modeling and complicated parameters identification of trajectory tracking control of the quadrotor,a data driven model-free adaptive control method based on the improved sliding mode control(ISMC)algorithm is designed,which does not depend on the precise dynamic model of the quadrotor.The design of the general sliding mode control(SMC)algorithm depends on the mathematical model of the quadrotor and has chattering problems.In this paper,according to the dynamic characteristics of the quadrotor,an adaptive update law is introduced and a saturation function is used to improve the SMC.The proposed control strategy has an inner and an outer loop control structures.The outer loop position control provides the required reference attitude angle for the inner loop.The inner loop attitude control ensures rapid convergence of the attitude angle.The effectiveness and feasibility of the algorithm are verified by mathematical simulation.The mathematical simulation results show that the designed model-free adaptive control method of the quadrotor is effective,and it can effectively realize the trajectory tracking control of the quadrotor.The design of the controller does not depend on the kinematic and dynamic models of the unmanned aerial vehicle(UAV),and has high control accuracy,stability,and robustness.展开更多
This paper focuses on the trajectory tracking of quadrotors under bounded external disturbances.An optimised robust controller is proposed to drive the position and attitude ofa quadrotor converge to their references ...This paper focuses on the trajectory tracking of quadrotors under bounded external disturbances.An optimised robust controller is proposed to drive the position and attitude ofa quadrotor converge to their references quickly. At first, nonsingular fast terminal slidingmode control is developed, which can guarantee not only the stability but also finite-timeconvergence of the closed-loop system. As the parameters of the designed controllers playa vital role for control performance, an improved beetle antennae search algorithm is proposedto optimise them. By employing the historical information of the beetle’s antennaeand dynamically updating the step size as well as the range of its searching, the optimisingis accelerated considerably to ensure the efficiency of the quadrotor control. The superiorityof the proposed control scheme is demonstrated by simulation experiments, from whichone can see that both the error and the overshooting of the trajectory tracking are reducedeffectively.展开更多
A robust nonsingular fixed time terminal sliding mode control scheme with a time delay disturbance observer is proposed for atmospheric pollution detection lidar scanning mechanism(APDL-SM)system.Distinguished from th...A robust nonsingular fixed time terminal sliding mode control scheme with a time delay disturbance observer is proposed for atmospheric pollution detection lidar scanning mechanism(APDL-SM)system.Distinguished from the conventional terminal sliding mode control methods,the authors design a novel fixed-time terminal sliding surface,the convergence time of sliding mode phase of which has a constant upper bound that is designable by adjusting only one parameter.Moreover,in order to overcome the problem of unknown upper bound of lumped uncertainty including model uncertainty,friction effect and external disturbances from the port environment,the authors propose a time delay disturbance observer to provide an estimation for the system lumped uncertainty.By using the Lyapunov synthesis,the explicit analysis of the convergence time upper bound are performed.Finally,simulation studies are conducted on the APDL-SM system to show the fast convergence rate and strong robustness of the proposed control scheme.展开更多
为了解决甘肃省河西区高速公路建设过程中环境监测困难的问题,通过融入大数据技术设计高速公路环境监测系统。采用最大功率点跟踪监测技术中的小控制单元和功率换算的方式设计定点跟踪结构;利用码分多址传输模式将监测设备与大数据库相...为了解决甘肃省河西区高速公路建设过程中环境监测困难的问题,通过融入大数据技术设计高速公路环境监测系统。采用最大功率点跟踪监测技术中的小控制单元和功率换算的方式设计定点跟踪结构;利用码分多址传输模式将监测设备与大数据库相互联系,缩短数据传输时间;对传统谱聚类算法进行改进;应用VMWare Player 16软件模拟监测过程,提高了监测能力。试验结果表明,设计所采用的公路监测系统的监测范围最大为86.7 m2,预警时间为30.16 s,系统结果准确率为97.1%。展开更多
提出基于改进快速搜索随机树算法的船舶路径规划与跟踪控制方法。采用嵌入Dijkstra算法的改进快速随机搜索树算法(Rapidly⁃Exploring Random Tree,RRT)算法进行船舶路径规划。将规划的优化路径作为船舶运动控制系统的期望输入,基于工业...提出基于改进快速搜索随机树算法的船舶路径规划与跟踪控制方法。采用嵌入Dijkstra算法的改进快速随机搜索树算法(Rapidly⁃Exploring Random Tree,RRT)算法进行船舶路径规划。将规划的优化路径作为船舶运动控制系统的期望输入,基于工业界广为使用的内外环控制思想设计船舶运动学跟踪控制率,较好地解决了欠驱动船舶路径跟踪问题。在船舶动力学子系统中,利用神经网络逼近动力学子系统中的未建模动态和外部干扰,所设计的神经网络滑膜跟踪控制器能有效地跟踪运动学子系统的引导率信号。仿真试验验证了所提出的基于RRT的船舶路径规划与跟踪控制的有效性。展开更多
文摘In order to solve the problems of dynamic modeling and complicated parameters identification of trajectory tracking control of the quadrotor,a data driven model-free adaptive control method based on the improved sliding mode control(ISMC)algorithm is designed,which does not depend on the precise dynamic model of the quadrotor.The design of the general sliding mode control(SMC)algorithm depends on the mathematical model of the quadrotor and has chattering problems.In this paper,according to the dynamic characteristics of the quadrotor,an adaptive update law is introduced and a saturation function is used to improve the SMC.The proposed control strategy has an inner and an outer loop control structures.The outer loop position control provides the required reference attitude angle for the inner loop.The inner loop attitude control ensures rapid convergence of the attitude angle.The effectiveness and feasibility of the algorithm are verified by mathematical simulation.The mathematical simulation results show that the designed model-free adaptive control method of the quadrotor is effective,and it can effectively realize the trajectory tracking control of the quadrotor.The design of the controller does not depend on the kinematic and dynamic models of the unmanned aerial vehicle(UAV),and has high control accuracy,stability,and robustness.
基金Fujian Provincial Science and Technology Major Project(No.2020HZ02014)Education and Teaching Reform Research Project for Colleges and Universities in Fujian Province(No.FBJG20210239)Huaqiao University Graduate Education Teaching Reform Research Funding Project(No.20YJG009).
文摘This paper focuses on the trajectory tracking of quadrotors under bounded external disturbances.An optimised robust controller is proposed to drive the position and attitude ofa quadrotor converge to their references quickly. At first, nonsingular fast terminal slidingmode control is developed, which can guarantee not only the stability but also finite-timeconvergence of the closed-loop system. As the parameters of the designed controllers playa vital role for control performance, an improved beetle antennae search algorithm is proposedto optimise them. By employing the historical information of the beetle’s antennaeand dynamically updating the step size as well as the range of its searching, the optimisingis accelerated considerably to ensure the efficiency of the quadrotor control. The superiorityof the proposed control scheme is demonstrated by simulation experiments, from whichone can see that both the error and the overshooting of the trajectory tracking are reducedeffectively.
基金supported by the National Key Research and Development Project of China under Grant Nos.2018AAA0100800 and 2018YFE0106800the National Natural Science Foundation of China under Grant Nos.61903353,61725304,and 1761673361+2 种基金Major Science and Technology Project of Anhui Province under Grant No.912198698036SINOPEC Programmes for Science and Technology Development under Grant No.PE19008-8the Fundamental Research Funds for the Central Universities under Grant No.WK2100000013。
文摘A robust nonsingular fixed time terminal sliding mode control scheme with a time delay disturbance observer is proposed for atmospheric pollution detection lidar scanning mechanism(APDL-SM)system.Distinguished from the conventional terminal sliding mode control methods,the authors design a novel fixed-time terminal sliding surface,the convergence time of sliding mode phase of which has a constant upper bound that is designable by adjusting only one parameter.Moreover,in order to overcome the problem of unknown upper bound of lumped uncertainty including model uncertainty,friction effect and external disturbances from the port environment,the authors propose a time delay disturbance observer to provide an estimation for the system lumped uncertainty.By using the Lyapunov synthesis,the explicit analysis of the convergence time upper bound are performed.Finally,simulation studies are conducted on the APDL-SM system to show the fast convergence rate and strong robustness of the proposed control scheme.
文摘为了解决甘肃省河西区高速公路建设过程中环境监测困难的问题,通过融入大数据技术设计高速公路环境监测系统。采用最大功率点跟踪监测技术中的小控制单元和功率换算的方式设计定点跟踪结构;利用码分多址传输模式将监测设备与大数据库相互联系,缩短数据传输时间;对传统谱聚类算法进行改进;应用VMWare Player 16软件模拟监测过程,提高了监测能力。试验结果表明,设计所采用的公路监测系统的监测范围最大为86.7 m2,预警时间为30.16 s,系统结果准确率为97.1%。
文摘提出基于改进快速搜索随机树算法的船舶路径规划与跟踪控制方法。采用嵌入Dijkstra算法的改进快速随机搜索树算法(Rapidly⁃Exploring Random Tree,RRT)算法进行船舶路径规划。将规划的优化路径作为船舶运动控制系统的期望输入,基于工业界广为使用的内外环控制思想设计船舶运动学跟踪控制率,较好地解决了欠驱动船舶路径跟踪问题。在船舶动力学子系统中,利用神经网络逼近动力学子系统中的未建模动态和外部干扰,所设计的神经网络滑膜跟踪控制器能有效地跟踪运动学子系统的引导率信号。仿真试验验证了所提出的基于RRT的船舶路径规划与跟踪控制的有效性。
