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1.
针对动态环境中多智能体编队控制及避障问题,提出了一种基于模糊人工势场法的编队方法。首先,在领航跟随法的框架下控制编队队形,在动态队形变换策略的异构模式下,使用人工势场法为多智能体编队中每个智能体规划避障路径;其次,利用模糊控制器控制跟随智能体追踪领航智能体,同时保持跟随智能体之间与领航智能体的相对距离,遇到未知障碍物时,及时保持多智能体编队之间的队形并避免碰撞障碍物。针对人工势场法在引力增量系数和斥力增量系数设置的局限性,利用模糊控制器选择出适应环境的增量系数。Matlab仿真实验结果表明,该方法能够有效地解决复杂环境下多智能体编队控制及避障问题,使用效率函数对实验数据进行分析,验证了所优化方法的合理性和有效性。  相似文献   

2.
针对多智能体编队通过障碍物区域的避撞和避障问题,利用传感器的监控功能,采用改进的人工势能场法对避障算法进行优化,使多智能体编队能有效地通过障碍物区域,并在通过障碍物区域后再次形成多智能体编队.首先,从多智能体模型上进行改进,建立一种具有可视化范围的速度为矢量的速度可变的智能体模型.然后,使用矢量的人工势能场法进行多智能体编队的避撞和避障.最后,针对多智能体编队避障过程中会存在“局部困扰”的情况,加入“回环力”使多智能体编队能够通过障碍物区域,并在通过障碍物区域后继续编队运行.同时,使用MATLAB软件在坐标系中进行多智能体编队的避障仿真,验证了改进人工势能场法的有效性和正确性,为多智能体编队避障问题提供了更加有效的方法.  相似文献   

3.
无线传感器网络中基于移动智能体的目标追踪   总被引:4,自引:1,他引:4  
就无线传感器网络中的目标追踪问题而言,减少传感器之间的冲突、提高追踪精度是两个重要问题.为此,采用移动智能体方法协同声音传感器追踪移动目标.当目标出现时,负责追踪的智能体产生,并随目标移动而移动.为减小在选举移动智能体的过程中出现的冲突,采用基于概率的选举策略,给出概率函数的设置方法.在目标关联过程中,时间窗口的大小对算法的追踪精度而言至关重要,经过分析,给出了设置时间窗口大小的基本原则.仿真结果表明设计恰当的随机函数和时间窗口可以有效地减小冲突、提高追踪的精度.  相似文献   

4.
为实现不确定环境下无人机对远程超视距目标的精确指示,考虑空中移动和静止障碍物,提出基于观测优化的双机协同控制与避障算法,从而增加测量信息,减小目标状态估计的不确定度.以费舍尔信息矩阵(FIM)表征所获取的目标信息,理论推导出三维空间中双机最优观测的指标函数,并设计无人机协同控制律,得到优化的无人机观测航迹,增强无人机协同估计目标位置的能力.采用基于相对速度空间的避障算法,同时考虑转弯角速度和传感器探测距离限制的因素,提出保持观测优化的避碰策略,并设计避障控制律,实现对静止和移动障碍物的规避.最后,通过仿真实验验证所提控制方法的有效性和实用性,仿真结果表明,所提出的控制算法能够引导无人机处于优化的观测位置,同时完成对移动和静止障碍物的规避.  相似文献   

5.
现有多智能体系统网络研究方法缺乏对局部网络质量与区域性任务需求之间的匹配分析,这将影响任务的完成效率和质量,为此提出一种基于任务需求匹配的网络连通质量控制方法。首先,利用智能体移动状态分析系统网络的间歇连通性;然后,结合任务需求以及系统的间歇网络连通性构建基于主从模式的多智能体子网集合,进而从三个方面评估子网集合的连通质量;最后,提出基于网络连通质量控制的多智能体移动优化模型,用最大的子网集合连通质量表示多智能体网络连通质量,在智能体移动距离和网络连通质量的约束下求解任务完成率最大化的多智能体移动策略,通过该策略形成多智能体网络以执行任务。实验结果表明,该方法可以有效控制网络连通质量,维持任务完成率并提高智能体移动效用。  相似文献   

6.
导航和避障是移动机器人自主智能中一项基础且重要的任务,其目的是引导机器人到达相应的位置。随着移动机器人的广泛使用,移动机器人常需要在大量移动障碍物的环境中导航和避障。提出了一种基于深度强化学习的导航避障算法,通过基于残差卷积和注意力机制的深度Q网络与势能奖励函数相结合,提高了在密集动态环境中导航避障的性能。仿真实验证明,当环境中动态障碍物密度大于0.4 ppm时,导航成功率大于60%。  相似文献   

7.
用于控制机器人在存在移动障碍物的工况中,智能避障安全抵达目的地,设计基于STM32单片机的机器人移动障碍物智能躲避系统。系统信息采集模块通过超声波传感器、加速度传感器,采集机器人与障碍物之间距离及机器人运行速度信息,传输至STM32单片机缓存整理后,通过ZigBee通信网络发送至上位机,上位机结合所采集数据,设计躲避指令传输至STM32单片机,STM32单片机驱动电机驱动模块,使用基于模糊控制的移动障碍物智能躲避模型,根据躲避指令调节机器人运行速度与角度,控制机器人的运行速度与位置,均处于不可能出现碰撞的状态,完成移动障碍物智能躲避。实验结果显示,该系统应用后,机器人对单个移动障碍物、多个移动障碍物的测距结果准确,且机器人具备智能避障性能,可绕开移动障碍物,安全抵达目的地。  相似文献   

8.
闫敬  关新平  罗小元  杨晛 《自动化学报》2012,38(7):1074-1082
针对多智能体系统提出了一种分布式预测控制方法. 首先, 研究了有输入约束下的一致性问题. 其次, 对环境中有障碍物的多智能体轨迹规划进行了研究, 其中只有当障碍物进入智能体有限感知区域内时, 障碍物状态信息才能被获取. 基于预测控制方法, 设计了一种分布式控制算法来解决上面两个问题. 构造一个与每个智能体动力学相交互的代价函数, 设计相应最优控制问题, 从而实现优化控制算法. 智能体间交互信息是其邻居在上一时刻的最优控制状态. 系统稳定性可以通过构造代价函数中的一个终点状态控制器与最优控制问题中的一个终点状态区域来保证. 仿真研究表明所提方法的有效性.  相似文献   

9.
基于二次Bezier曲线的无线传感网避障路径规划研究   总被引:1,自引:0,他引:1  
用固定Sink节点进行无线传感网内数据采集的传统方式会导致热点区域(hot spot)问题,而采用移动Sink节点进行数据采集可以克服这个问题,从而达到均衡网络能量分布与延长网络生命周期的效果.本文针对类车型机器人作为无线传感网中移动数据汇聚节点的应用场景,提出了一种基于Bezier连续曲线的移动Sink节点避障路径规划算法.本文构建了连续分段Bezier曲线为巡航轨迹,采用人工势场中的斥力场理论实现对多个障碍物的智能躲避,动态调节二次Bezier曲线的内部控制点位置,将障碍物排斥在二次Bezier曲线之外.仿真结果验证本文提出的算法可以实现移动Sink节点规划路径的避障功能,同时Bezier曲线规划算法简单,计算量较小.  相似文献   

10.
针对传统的飞行器集群避障方法不能有效规避非规则障碍物的问题,提出一种基于点状β智能体的集群避障控制方法。在加速度输入的基础上,基于β智能体概念定义点状β智能体,将α智能体对其在障碍物表面投影的规避变为对点状β智能体的规避,调整个体加速度输入中(α, β)协议量的β智能体的坐标和相关向量,使多智能体面向非规则障碍物形成集群。仿真结果表明,该方法能实现集群对非规则障碍物的规避。  相似文献   

11.
针对无人机编队保持和动态障碍物规避控制问题,本文提出了一种新的基于群集行为的分布式多无人机编队控制和避障控制算法.首先考虑了由机间气流等因素带来的干扰,基于吸引/排斥势场和一致性方法,设计了分布式无人机编队的队形保持控制算法,对编队内无人机之间的距离进行控制.进一步考虑外部移动障碍对无人机编队的影响,引入了排斥势场产生避障行为,从而控制无人机编队规避移动障碍物.然后,基于Lyapunov的稳定性分析方法,证明了多无人机编队闭环系统的稳定性和系统状态误差的最终有界性.最后在四旋翼无人机编队实验平台上进行了室内飞行实验验证.实验结果表明,本文提出的分布式群集编队避障控制算法可以有效控制无人机编队规避外部障碍物,且具有规避障碍后的队形重构能力.  相似文献   

12.
In this paper, the problems of target tracking and obstacle avoidance for multi-agent networks with input constraints are investigated. When there is a moving obstacle, the control objectives are to make the agents track a moving target and to avoid collisions among agents. First, without considering the input constraints, a novel distributed controller can be obtained based on the potential function. Second, at each sampling time, the control algorithm is optimized. Furthermore, to solve the problem that agents cannot effectively avoid the obstacles in dynamic environment where the obstacles are moving, a new velocity repulsive potential is designed. One advantage of the designed control algorithm is that each agent only requires local knowledge of its neighboring agents. Finally, simulation results are provided to verify the effectiveness of the proposed approach.  相似文献   

13.
In this paper, we consider a control problem for nonholonomic multi-agent systems in which agents and obstacles operate within a circular-shaped work area. We assume that agents only have limited sensing and communication ranges. We propose a novel control scheme using potential functions that drives agents from the initial to the goal configuration while avoiding collision with other agents, obstacles, and the boundary of the work area. The control scheme employs an avoidance strategy that ensures that the agents are never trapped at local minima that are typically encountered with most potential function-based approaches. A numerical simulation is presented to demonstrate the validity and effectiveness of the proposed control scheme.  相似文献   

14.
当智能体自主执行任务时,局部障碍物可测的未知环境增加了局部极值和执行器饱和发生的概率.对此,本文提出了虚拟角速度跟踪的避障策略.首先,基于简易障碍物的几何模型构造虚拟的避障引导角,并利用李雅普诺夫方法设计角速度控制律,通过受限制的虚拟角速度跟踪来实现避障控制.然后,引入方位因子改进距离型权值分配器,强化轨迹附近障碍物的影响以降低局部极值发生的概率.最后,对于不完全可测的复杂障碍物,根据历史探测信息建立以边界点为中心的简易障碍物模型.仿真结果表明,该策略能够避让低速动态障碍物及U型复杂障碍物,并且可实现抗饱和控制.  相似文献   

15.
针对传感器范围有限的质点移动机器人,提出了一种新的被动式目标跟踪控制方法,使其能在动态变化的环境中有效地避开静止和运动的障碍物。建立了多目标控制问题模型,为环境中的每一个目标生成人工势场,在此基础上设计生成综合控制量。与标准的势场法不同的是:提出的综合势场法是时变的,而且有效地考虑了非静止障碍物和机器人的运动。其基本条件和主要特性均由严格的李亚普洛夫方法导出和证明。仿真实例介绍了该方法的设计过程,通过实验证明了其有效性。  相似文献   

16.
A liquid sphere‐inspired physicomimetics approach is presented for multiagent formation control. The agents are formulated as a liquid sphere, which is modeled by a virtual spring network. Then, a decentralized controller is obtained for each agent. The stability and convergence are proved. The scalability and flexibility are analyzed. Using the proposed approach, arbitrarily shaped formations can be obtained; and an extra agent can be added to a formation like mixing a drop of liquid into a liquid sphere. By designing extra virtual repulsive forces from obstacles, a formation avoids obstacles like a fluid flowing over obstacles or squeezing through narrow passages. The required number of communication links is N for N agents. The use of physicomimetics makes the approach computationally simple, and the physical meanings of the parameters definite. To illustrate the advantages of the proposed approach, a structural potential function‐based approach is selected as the comparative method. Simulation results demonstrate the effectiveness of the liquid sphere‐inspired formation control approach.  相似文献   

17.
Interactive robot doing collaborative work in hybrid work cell need adaptive trajectory planning strategy. Indeed, systems must be able to generate their own trajectories without colliding with dynamic obstacles like humans and assembly components moving inside the robot workspace. The aim of this paper is to improve collision-free motion planning in dynamic environment in order to insure human safety during collaborative tasks such as sharing production activities between human and robot. Our system proposes a trajectory generating method for an industrial manipulator in a shared workspace. A neural network using a supervised learning is applied to create the waypoints required for dynamic obstacles avoidance. These points are linked with a quintic polynomial function for smooth motion which is optimized using least-square to compute an optimal trajectory. Moreover, the evaluation of human motion forms has been taken into consideration in the proposed strategy. According to the results, the proposed approach is an effective solution for trajectories generation in a dynamic environment like a hybrid workspace.  相似文献   

18.
In this paper, we consider the problem of flocking and shape‐orientation control of multi‐agent systems with inter‐agent and obstacle collision avoidance. We first consider the problem of forcing a set of autonomous agents to form a desired formation shape and orientation while avoiding inter‐agent collision and collision with convex obstacles, and following a trajectory known to only one of the agents, namely the leader of the formation. Then we build upon the solution given to this problem and solve the problem of guaranteeing obstacle collision avoidance by changing the size and the orientation of the formation. Changing the size and the orientation of the formation is helpful when the agents want to go through a narrow passage while the existing size or orientation of the formation does not allow this. We also propose collision avoidance algorithms that temporarily change the shape of the formation to avoid collision with stationary or moving nonconvex obstacles. Simulation results are presented to show the performance of the proposed control laws.  相似文献   

19.
避障是多智能体能够适应复杂环境并顺利完成任务的必要条件之一。为使多智能体更快通过障碍物并达到一致,提出了一种多智能体避障控制算法。算法引入了避障系数,该系数由基于角度比较的碰撞锥检测方法来确定,并通过牵制控制输入完成多智能体的避障。证明了在该算法作用下所有智能体最终会避开障碍,避免碰撞并最终达到一致。通过实验仿真分析和对比,该方法能够使得多智能体更快避开障碍物。  相似文献   

20.
This paper is dealt with dynamic analysis of the wheeled mobile manipulators in the presence of moving obstacles considering optimal payload criterion. General dynamic formulation of the system was derived, and the moving obstacle avoidance strategy was proposed in terms of dynamic potential functions. The problem of dynamic motion planning and payload maximization was formulated using open-loop optimal control theory. Then, the indirect solution based on Pontryagin’s minimum principle was employed to solve the problem. Using the proposed method, complete nonlinear states and control constraints were treated without any simplifications such as linearizing the dynamics equations, discretizing the robot’s workspace, or parameterizing the solution. The proposed method will be useful for the system design and in the situation where the trajectories of obstacles are predefined. Finally, capability and applicability of the proposed method were investigated by the number of simulations on a two-link mobile manipulator.  相似文献   

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