共查询到19条相似文献,搜索用时 203 毫秒
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为了解决以传统人工示教方式确定双机械臂协作装配位置的局限性和随机性,以双机械臂轴孔协调装配为工程背景,针对协作装配过程中机械臂的整体运动灵活性和轨迹规划,采用粒子群算法进行多次寻优,求解整体全局灵活性最优的装配位置,并基于最优位置进行了多目标轨迹优化。分析了双机械臂协调装配过程中的运动约束关系,以可操作度为灵活性评价指标,提出了双机械臂协作装配系统的可操作度评价方法,以此构建优化目标函数,采用粒子群算法,在双机械臂协作空间中求取系统全局可操作度最优的装配位置;基于灵活性最优位置,采用多目标粒子群算法,以时间、能耗、冲击为目标进行了轨迹优化,并在Matlab机器人仿真平台进行了仿真分析。结果表明,将灵活性指标运用到轨迹规划中,能提高机械臂作业效率,降低能耗与冲击损耗;且整个运动过程可维持较高可操作度,能有效规避传统人工示教方式的随机性,实现双机械臂协作装配的最优灵活性轨迹规划。 相似文献
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针对建筑移动机器人路径规划中移动小车作业点问题,提出了以最大可操作度为优化指标,基于遗传粒子群混合算法搜寻移动小车作业点的方法。阐述了地砖铺设机器人系统的组成及灵巧度优化指标;给出了移动机械臂铺砖的一般步骤;结合遗传算法和粒子群算法的优点,以机械臂可操作度最大为原则进行优化,以快速准确地得到最优作业位姿点。利用MATLAB软件编写程序对移动机器人贴地砖作业进行了仿真实验。结果表明:该路径优化方法能够精确地得到合理的作业点位置。 相似文献
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体能训练机器人操作臂的力方向可操作度直接影响着运动轨迹规划精度。基于此,研究了体能训练机器人操作臂交互动态轨迹规划方法,分析体能训练机器人操作臂的力方向可操作度,利用多维支持向量机代替高斯混合模型,在李雅普洛夫第二方法的基础上确定稳定性约束条件,构建基于支持向量机的轨迹规划模型,实现体能训练机器人操作臂交互动态轨迹规划。实验结果表明,所提方法的角位移更小、噪声识别值和超参数更高,验证了所提方法轨迹规划弹性规划能力较好且轨迹规划精度较高。 相似文献
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随着科技的发展,机械臂开始往更加智能化、自动化的方向发展,单单依靠传统的通过示教器执行单一指令的机械臂已远远不能满足各类复杂的生产和服务。为了让机械臂更加智能化和科技化,通过赋予其双目视觉感知模块和智能控制系统,对机械臂智能抓取控制进行研究。采用HSR-Co605协作机械臂,基于双目视觉相机在ROS系统进行仿真建模、运动规划、障碍物规避等试验;在复杂环境下实现了机器人双目视觉模块自主识别定位物体,同时对周围障碍物进行避障规划,实现机械臂自主运动规划及智能抓取操作。在不同场景下进行了智能抓取试验,并对其试验结果进行了分析,为后续机械臂能更好地适应复杂的工作环境以及产业化发展提供参考。 相似文献
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分别用条件数和可操作度两个灵活度指标对空间7R冗余度机械臂进行了运动规划,分析了基于不同指标的末端轨迹的异同.研究结果表明:就末端轨迹而言,初始点最优是一种有效的规划方法;条件数的优化能力要强于可操作度;当规划进入优化解域时,指标函数逐点最优曲线的波动会使机械臂末端产生突跳现象. 相似文献
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欠驱动机器人的关节空间运动是通过主、被动关节间的动力学耦合实现的,系统运动可能发生动力学耦合奇异,使欠驱动机器人的动态操作性能严重降低。针对一般具有任意多个被动关节的开链欠驱动机器人系统,基于动力学分析提出一种优化控制方法,其核心是在欠驱动机器人的全部耦合运动空间中,根据动力学耦合操作性度量,动态构造有限个覆盖全部耦合运动空间的具有最佳耦合度的子空间,使发生在这些子空间中的耦合运动具有余度驱动的特点,从而实现提高欠驱动机器人的动力学耦合度的优化控制。提出的方法通过平面四连杆机器人进行仿真,仿真结果证明了这种方法是可行的。 相似文献
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Bong-Huan Jun Pan-Mook Lee Seungmin Kim 《Journal of Mechanical Science and Technology》2008,22(5):887-894
This paper describes the task-oriented manipulability of tele-operated robotic arms mounted on a remotely operated vehicle
(ROV) and its application to task-oriented joint configurations. The main purpose of the study is to reduce the tele-operator’s
burden in performing underwater tasks by enhancing the functionality of the manipulator. Even though a manipulator has 6 degrees-of-freedom
(DOF), which is proper DOF to work in Cartesian workspace, the manipulator might have redundancy according to task types and
order of task-priority. This paper focuses on the problem to utilize the redundancy by introducing a scalar function as an
object of optimization. The scalar function is composed of a taskoriented manipulability measure (TOMM) and joint limit measure
(JLM). Using sequential quadratic programming (SQP) with the object function, we obtained optimal postures of the manipulator
for a given position constraint of the end-effecter. Adopting the scalar function as a performance index, we solved a redundancy
resolution problem based on the pseudo inverse of the task-oriented Jacobian matrix. 相似文献
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基于形状变化的冗余机械手可操作性分析 总被引:1,自引:0,他引:1
受冗余机械手的可操作性理论和可操作性椭圆的启发,提出形状变化可操作性理论和形状变化可操作性椭圆。可操作性表示了冗余机械手在形状给定的前提下,它的每一个关节产生速度的性能;形状变化可操作性表示了当冗余机械手的手臂末端被给定任务时,其余中间关节产生速度的性能,即是形状变化性能,手臂末端执行给定的任务,如轨道追踪,因此不具备形状变化可操作性。对可操作性椭圆和形状变化可操作性椭圆进行比较和分析。通过对七关节机械手在二维平面内的轨道追踪和障碍物回避的实例分析、以及对三维空间内的不同姿势(即不同形状)下的七关节机械手所对应的不同形状变化可操作性椭圆的比较分析,能够认识到形状变化可操作性理论的提出对于评估和设计冗余机械手的结构和形状有着重要的实际意义。 相似文献
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R. Saravanan S. Ramabalan N. Godwin Raja Ebenezer R. Natarajan 《The International Journal of Advanced Manufacturing Technology》2009,41(3-4):386-406
The optimum robot structure design problem based on task specifications is an important one, since it has greater influence on manipulator workspace design, vibrations of the manipulator during operation, manipulator efficiency in the work environment and power consumption. In this paper, an optimization robot structure problem is formulated with the objective of determining the optimal geometric dimensions of the robot manipulators considering the task specifications (pick and place operation). The aim is to minimize torque required for motion and maximize manipulability measure of the robot subject to dynamic, kinematic, deflection and structural constraints with link physical characteristics (length and cross-sectional area parameters) as design variables. In this work, five different cross-sections (hollow circle, hollow square, hollow rectangle, C-channel and I-channel) have been experimented for the link. Three evolutionary optimization algorithms namely multi-objective genetic algorithm (MOGA), elitist nondominated sorting genetic algorithm (NSGA-II) and multi-objective differential evolution (MODE) are used for the optimum structural design of 2-link and 3-link planar robots. Two methods (normalized weighting objective functions and average fitness factor) are used to select the best optimal solution. Two multiobjective performance measures namely solution spread measure and ratio of non-dominated individuals are used to evaluate the Pareto optimal fronts. Two more multiobjective performance measures namely optimiser overhead and algorithm effort, are used to find computational effort of optimization algorithm. The results obtained from various techniques are compared and analyzed. 相似文献
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针对一种六棱锥式新型并联机器人的轨迹规划问题,基于具有反解选取准则的机构逆运动学方程,对奇异性和工作空间进行深入研究。由雅可比矩阵提出机构奇异判别方程,并引入可操作度性能指标进行奇异性分析。考虑运动副范围以及连杆干涉等约束条件,采用三维边界搜索法,给出机构在定姿态下工作空间的三维可视化描述。进行边界采样实验,实验结果表明了仿真的正确性。研究结果可为无奇异轨迹规划提供理论依据。 相似文献
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讨论移动机械手非完整运动最优规划问题.利用遗传算法对移动机械手进行了两点和多点运动规划,采用了浮点数编码及适应度最优保存策略.通过仿真试验,验证了该方法的有效性和可行性. 相似文献
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Vijyant Agarwal 《The International Journal of Advanced Manufacturing Technology》2012,61(5-8):727-744
The solution of inverse kinematics and trajectory planning with performance criteria for a redundant manipulator is proposed with modification in fuzzy c-means. A new fuzzy clustering model based on a new generalized validity index based on weighted within-scatter metrics and between-cluster scatter metrics for the manipulator is proposed. In order to understand the proposed algorithm and to show its performance, two simulation studies of trajectory planning with manipulability criteria for a redundant manipulator are modeled to solve the problems of finding association rules in the data and of setting up an appropriate classification procedures. The problem of redundant manipulator (which is a multi-input, multi-output nonlinear system) is new in terms of solution by clustering method. The proposed algorithm for the trajectory planning of the manipulator is simulated using Matlab®. All practical steps, from data acquisition to model validation, are illustrated using a 4 degree of freedom robot manipulator. The simulated results are compared with the numerical methods of the trajectory planning. The results are presented graphically. The proposed method has the advantage of simplicity, flexibility, and good tracking performance. 相似文献