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应用遥编程的大时延遥操作技术 总被引:4,自引:0,他引:4
如何克服通信线路中的大时延和有限带宽,是空间遥机器人面临的最重要的一个问题.本文
阐述了应用遥编程技术提高大时延遥操作的稳定性和操作精度的基本思想.提出了一种将操
作区分段,采取复合控制策略的遥操作方法.同时介绍了基于遥编程概念的遥操作实验系统
的设计及其试验结果. 相似文献
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预估控制下的实时网络遥操作移动机器人 总被引:2,自引:2,他引:2
构建了能使操作者通过Internet远程实时控制的移动机器人系统.为了补偿网络时延和抵消其对遥操作系统的影响,基于我们以前提出的改进型Smith预估器原理,采用了预估控制策略.为了保证系统稳定性和透明性,基于主从端的传感器信息交换,设计了一个动态模型管理器,其中模型和力反馈误差调节通过模糊控制实现.除了力反馈外,为了增强遥操作的实时性,引入了预估的虚拟显示.为了精确地预测网络时延,提出了一个新颖的时钟同步算法.为了降低时延抖动,结合我们提出的两个算法,实现了数据缓冲策略.最后,通过长距离的网络遥操作实验验证了系统和控制策略的实用性和有效性. 相似文献
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空间机器人遥操作克服时延影响的研究进展 总被引:1,自引:0,他引:1
针对空间机器人遥操作亟需解决的时延问题,回顾了其克服时延影响的研究发展历程,并对目前应该采取的应对策略提出了建议.指出就目前的技术发展水平而言,要能够有效地克服时延以确保空间机器人遥操作稳定性的同时系统具有良好的操作性能,应该采取的策略是:①在结构化的、确定性的和静态环境下,采用具有鲁棒性的多感知增强现实技术;②在非结构化的、不确定性的和动态环境下,采用视觉引导下的从端局部智能自主控制技术;③在多态环境下,采用多模式智能控制技术. 相似文献
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基于Web的机器人遥操作 总被引:5,自引:1,他引:5
目前,在基于Internet的遥操作中普遍存在着大时延和有限带宽的问题,严重降低了系统的稳定性与安全性。遥编程技术的提出为这些问题的解决开辟了一条很有希望的道路。应用这一技术,实现了一个基于Web的机器人遥操作实验系统。 相似文献
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本文研究了空间站大臂机械手共享控制系统及其仿真,首先提出了一种自主与遥控相结合的共享控制系统,其次重点研究了基于OpenGL的空间站大臂虚拟仿真环境建模技术,并开发了基于虚拟模型的自主规划算法,最后进行了计算机图形仿真研究。 相似文献
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能量观测与控制方法基于无源理论,在有源网络端口观测力和速度(位置)信号,分析并动态补偿能量以保持网络稳定,无需控制对象模型信息和通信传输时延估计。综述了时延遥操作系统的一端口和二端口网络能量观测与控制方案的研究进展,讨论了存在的主要问题,并指出进一步研究的方向为定量分析操作性能、改进控制器工作条件、克服传感器影响和安全操作等。 相似文献
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Ziwei Wang Zhang Chen Yiman Zhang Xingyao Yu Xiang Wang Bin Liang 《国际强度与非线性控制杂志
》2019,29(4):1007-1030
》2019,29(4):1007-1030
In this paper, we present a robust adaptive control algorithm for a class of bilateral teleoperation systems with system uncertainties and jittering time delays. The remarkable feature of jittering delays is that time delays change sharply and randomly. Conventional controllers would fail because jittering time delays introduce serious chattering. To address the jittering issue, a novel jittering‐free scheme is developed by relaxing and extending the frequently used constant upper bound. Moreover, an adaptive law was incorporated with the Chebyshev neural network to deal with the system uncertainties. To obtain finite‐time synchronization performance, a fast terminal sliding mode controller is proposed through the technique of “adding a power integrator.” With the proposed control scheme, the robust finite‐time convergence performance is guaranteed. The settling time can be further calculated with the controller parameters. The simulation and experiment results have demonstrated the effectiveness of the proposed method. 相似文献
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Integrated adaptive robust control for multilateral teleoperation systems under arbitrary time delays 下载免费PDF全文
With the increasing industrial requirements such as bigger size object, stable operation, and complex task, multilateral teleoperation systems extended from traditional bilateral teleoperation are widely developed. In this paper, the integrated control design is developed for multilateral teleoperation systems, where n master manipulators are operated by human to remotely control n slave manipulators cooperatively handling a target object. For the first time, the control objectives of multilateral teleoperation including stability, synchronization, transparency, and internal force distribution are clarified systematically. A novel communication architecture is proposed to cope with communication delays, where the estimated environmental parameters are transmitted from the slave side to the master, to replace the traditional environmental force measurement in the communication channel. A kind of nonlinear adaptive robust control technique is used to deal with nonlinearities, unknown parameters, and modeling uncertainties existing in the master, slave, and environmental dynamics, so that the excellent tracking performance is achieved in both master and slave sides. The coordinated motion/force control is designed in the slave side by the optimal internal force distribution among n slave manipulators, and the impedance control is designed in the master side to realize the target transparency behavior. In summary, the proposed control algorithm can achieve the guaranteed robust stability, the excellent synchronization and transparency performance, and the optimal internal force distribution simultaneously for multilateral teleoperation systems under arbitrary time delays and various modeling uncertainties. The simulation is carried out on a 2‐master/2‐slave teleoperation system, and the results show the effectiveness of the proposed control design. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
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The stability and trajectory tracking control problem of passive teleoperation systems with the presence of the symmetrical and unsymmetrical time-varying communication delay is addressed in this paper. The proposed teleoperator is designed by coupling local and remote sites by delaying position signals of the master and slave manipulator. The design also comprises local proportional and derivative signals with nonlinear adaptive terms to cope with parametric uncertainty associated with the master and slave dynamics. The Lyapunov–Krasovskii function is employed to establish stability conditions for the closed-loop teleoperators under both symmetrical and unsymmetrical time-varying communication delay. These delay-dependent conditions allow the designer to estimate the control gains a priori in order to achieve asymptotic property of the position, velocity and synchronisation errors of the master and slave systems. Finally, simulation results along with comparative studies are presented to illustrate the effectiveness of the proposed method. 相似文献
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针对通讯信号在天地传输过程中产生的较大时延导致对空间机器人的遥操作产生巨大困难,提出了通过虚拟现实技术对遥操作结果进行预测仿真.以规避传输时延影响的方法,并通过虚拟夹具技术降低操作复杂度;通过基于时间戳的修正策略以确保预测结果的准确性;针对具体任务环境提出了九点碰撞检测算法以提高系统运行效率.进行了多次与实物相结合的实验,实验结果表明,该系统运行快速、预测准确,可以有效地规避大时延天地传输带来的弊端,帮助地面操作员完成空间机器人的遥操作. 相似文献
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Adaptive finite‐time control for nonlinear teleoperation systems with asymmetric time‐varying delays 下载免费PDF全文
This paper addresses the adaptive finite‐time control problem of nonlinear teleoperation system in the presence of asymmetric time‐varying delays. To achieve the finite‐time position tracking, a novel adaptive finite‐time coordination algorithm based on subsystem decomposition is developed. By introducing a switching‐technique‐based error filtering into our design framework, the complete closed‐loop master (slave) teleoperation system is modeled as a special class of switched system, which is composed of two subsystems. To analyze such system, a finite‐time state‐independent input‐to‐output stability criterion is first developed for some normal switched nonlinear delayed systems. Then based on the classical Lyapunov–Krasovskii method, the stability of complete closed‐loop systems is obtained. It is shown that the proposed scheme can make the position errors converge into a deterministic domain in finite time when the robots continuously contact with human operator and/or the environment in the presence of asymmetric time‐varying delays. Finally, the simulation results are given to demonstrate the effectiveness. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
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In this paper a generalized design and control method for teleoperation systems with communication time delay is presented. The design method is based on the state space formulation and it allows to obtain the control parameters for any teleoperation system where the master and the slave manipulators would be represented by nth-order linear differential equations. Through state convergence between the master and the slave, the control system allows the slave to follow the master inspite of the time delay. The method is also able to establish the desired dynamics of this convergence and the dynamics of the slave manipulator. Experimental results are presented showing the validity of the proposed design and control method. 相似文献
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This paper addresses the control design problem under no velocity measurements for nonlinear teleoperation system in the presence of asymmetric time‐varying delays. Based on the proposed proportional‐derivative‐like controller and nonlinear‐proportional‐derivative‐like controller, which correspond, respectively, to the actuator non‐saturation and actuator saturation, the control objectives of boundedness of velocities and position tracking errors for the master robot and the slave robot are obtained. These designed controllers do not rely on the velocity signals. The effectiveness of the proposed controller are finally verified by two numerical examples. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献