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2016 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS)最新文献

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Performance comparison of Wave Variable Transformation and Time Domain Passivity Approaches for time-delayed teleoperation: Preliminary results 波变量变换与时域无源法延迟遥操作性能比较:初步结果
Pub Date : 2016-12-20 DOI: 10.1109/IROS.2016.7759087
R. Balachandran, J. Artigas, U. Mehmood, J. Ryu
This paper presents initial results of a set of experiments to compare time-delayed teleoperation performance of selected architectures based on two popular passivity based methods, namely, Wave Variables Transformation (WVT) and Time Domain Passivity Approach (TDPA). Five different architectures widely used and available in literature are selected: 2-channel and 3-channel for both WV and TDPA, and 4-channel based on TDPA. An empirical approach for measuring transparency is proposed, which presents three main qualities: 1) Controller independency 2) Frequency dependency of performance and 3) Removal of the human operator out of the loop. In order to achieve this, the human operator is replaced by a linear actuator equipped with a force sensor. Deterministic interactions between the simulated operator and the rest of the system can thus be easily implemented and registered. Therefore, this approach allows to isolate pure effects of any control method and perform a proper analysis in terms of selected attributes for a desired metrics. In this article, these are chosen to be effective impedance and position tracking error, both in the frequency domain. In addition to the quantitative results, a qualitative analysis is presented which underlines practical implications of each architecture and control method. The comparison sample presented contains five different delays, varying from 0 to 200 milliseconds, five different environmental impedances and 5 bilateral control architectures along with an analysis of the results obtained.
本文给出了一组实验的初步结果,比较了基于两种流行的基于无源性的方法,即波变量变换(WVT)和时域无源法(TDPA),所选架构的延迟遥操作性能。本文选择了文献中广泛使用的五种不同的架构:WV和TDPA的2通道和3通道,以及基于TDPA的4通道。提出了一种测量透明度的经验方法,该方法具有三个主要特性:1)控制器独立性;2)性能的频率依赖性;3)将人工操作员排除在环路之外。为了实现这一点,人类操作员被一个配备了力传感器的线性执行器所取代。因此,模拟操作员和系统其余部分之间的确定性交互可以很容易地实现和注册。因此,这种方法允许隔离任何控制方法的纯粹效果,并根据所选属性执行适当的分析。在本文中,这些被选择为有效阻抗和位置跟踪误差,两者都在频域。除了定量结果外,还提出了一个定性分析,强调了每种体系结构和控制方法的实际含义。所提供的比较样本包含五种不同的延迟,从0到200毫秒不等,五种不同的环境阻抗和五种双边控制架构,以及对所获得结果的分析。
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引用次数: 20
A passivity-based admittance control design using feedback interconnections 一种基于无源导纳的反馈互连控制设计
Pub Date : 2016-12-20 DOI: 10.1109/IROS.2016.7759143
Min Jun Kim, Woongyong Lee, C. Ott, W. Chung
Admittance control is a well-established and popular control strategy in modern robotics. However, the standard admittance controller has several limitations. First, the passivity can be guaranteed by finding a set of control parameters that makes the admittance function positive real. However, this approach cannot be applied to multi degrees-of-freedom robot because it requires transfer function analysis. Second, standard admittance controller is not suitable when the system is exposed to unexpected environmental interaction (of which interaction force is not measured) due to the wall sticking effect. To overcome these limitations, this paper proposes an admittance controller of which structure can be constructed by feedback interconnection of passive subsystems. The proposed approach was verified using experiments and simulations.
导纳控制是现代机器人技术中一种成熟而流行的控制策略。然而,标准导纳控制器有几个限制。首先,通过寻找一组使导纳函数为正实数的控制参数来保证无源性。然而,由于该方法需要进行传递函数分析,因此不能应用于多自由度机器人。其次,由于粘壁效应,当系统暴露于意外的环境相互作用(其中的相互作用力未测量)时,标准导纳控制器不适用。为了克服这些限制,本文提出了一种导纳控制器,其结构可以通过无源子系统的反馈互联来构造。通过实验和仿真验证了该方法的有效性。
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引用次数: 9
Vision-guided state estimation and control of robotic manipulators which lack proprioceptive sensors 缺乏本体感觉传感器的机械臂视觉引导状态估计与控制
Pub Date : 2016-12-01 DOI: 10.1109/IROS.2016.7759525
V. Ortenzi, Naresh Marturi, R. Stolkin, J. Kuo, M. Mistry
This paper presents a vision-based approach for estimating the configuration of, and providing control signals for, an under-sensored robot manipulator using a single monocular camera. Some remote manipulators, used for decommissioning tasks in the nuclear industry, lack proprioceptive sensors because electronics are vulnerable to radiation. Additionally, even if proprioceptive joint sensors could be retrofitted, such heavy-duty manipulators are often deployed on mobile vehicle platforms, which are significantly and erratically perturbed when powerful hydraulic drilling or cutting tools are deployed at the end-effector. In these scenarios, it would be beneficial to use external sensory information, e.g. vision, for estimating the robot configuration with respect to the scene or task. Conventional visual servoing methods typically rely on joint encoder values for controlling the robot. In contrast, our framework assumes that no joint encoders are available, and estimates the robot configuration by visually tracking several parts of the robot, and then enforcing equality between a set of transformation matrices which relate the frames of the camera, world and tracked robot parts. To accomplish this, we propose two alternative methods based on optimisation. We evaluate the performance of our developed framework by visually tracking the pose of a conventional robot arm, where the joint encoders are used to provide ground-truth for evaluating the precision of the vision system. Additionally, we evaluate the precision with which visual feedback can be used to control the robot's end-effector to follow a desired trajectory.
本文提出了一种基于视觉的方法,用于利用单目摄像机估计欠传感器机器人机械手的结构,并为其提供控制信号。一些用于核工业退役任务的远程操纵器缺乏本体感觉传感器,因为电子设备容易受到辐射的影响。此外,即使本体感觉关节传感器可以改装,这种重型机械手通常部署在移动车辆平台上,当强大的液压钻井或切割工具部署在末端执行器上时,这些平台会受到明显且不稳定的干扰。在这些场景中,使用外部感官信息(例如视觉)来估计机器人与场景或任务相关的配置是有益的。传统的视觉伺服方法通常依赖于关节编码器值来控制机器人。相比之下,我们的框架假设没有可用的关节编码器,并通过视觉跟踪机器人的几个部分来估计机器人的配置,然后在一组变换矩阵之间强制执行等式,这些变换矩阵与相机,世界和跟踪机器人部件的帧相关。为了实现这一目标,我们提出了两种基于优化的替代方法。我们通过视觉跟踪传统机械臂的姿态来评估我们开发的框架的性能,其中关节编码器用于为评估视觉系统的精度提供基础事实。此外,我们还评估了视觉反馈可以用来控制机器人末端执行器遵循期望轨迹的精度。
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引用次数: 13
Iterative path optimisation for personalised dressing assistance using vision and force information 使用视觉和力量信息进行个性化敷料辅助的迭代路径优化
Pub Date : 2016-12-01 DOI: 10.1109/IROS.2016.7759647
Yixing Gao, H. Chang, Y. Demiris
We propose an online iterative path optimisation method to enable a Baxter humanoid robot to assist human users to dress. The robot searches for the optimal personalised dressing path using vision and force sensor information: vision information is used to recognise the human pose and model the movement space of upper-body joints; force sensor information is used for the robot to detect external force resistance and to locally adjust its motion. We propose a new stochastic path optimisation method based on adaptive moment estimation. We first compare the proposed method with other path optimisation algorithms on synthetic data. Experimental results show that the performance of the method achieves the smallest error with fewer iterations and less computation time. We also evaluate real-world data by enabling the Baxter robot to assist real human users with their dressing.
我们提出了一种在线迭代路径优化方法,使百特人形机器人能够帮助人类用户穿衣服。机器人利用视觉和力传感器信息搜索最优的个性化穿衣路径:利用视觉信息识别人体姿态,建立上肢关节运动空间模型;机器人利用力传感器信息检测外力阻力,并对其运动进行局部调整。提出了一种基于自适应矩估计的随机路径优化方法。我们首先将所提出的方法与其他路径优化算法在合成数据上进行比较。实验结果表明,该方法能够以较少的迭代次数和较少的计算时间实现最小的误差。我们还通过让百特机器人帮助真正的人类用户穿衣来评估真实世界的数据。
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引用次数: 67
An anticipative kinematic limitation avoidance algorithm for collaborative robots: Two-dimensional case 协作机器人的预估运动限制规避算法:二维情形
Pub Date : 2016-12-01 DOI: 10.1109/IROS.2017.8206147
Philippe LeBel, C. Gosselin, A. Campeau-Lecours
This paper presents an anticipative robot kinematic limitation avoidance algorithm for collaborative robots. The main objective is to improve the performance and the intuitivity of the physical human-robot interaction. One obstacle to achieve this goal is the management of limitations such as joint position limitation, singularities and collisions with the environment. Indeed, in addition to performing a given principal task, human users must pay a close attention to the manipulator configuration in order to handle the kinematic limitations. The proposed anticipative algorithm aims at relieving the human user from having to deal with such limitations. The algorithm is first presented and detailed for each individual limitation of a planar RR serial robot. The framework developed to manage several limitations occurring simultaneously is then presented. Finally, experiments are performed in order to assess the performance of the algorithm.
针对协作机器人,提出了一种预测机器人运动限制规避算法。主要目标是提高物理人机交互的性能和直观性。实现这一目标的一个障碍是限制的管理,如关节位置限制、奇点和与环境的碰撞。事实上,除了执行给定的主要任务外,人类用户必须密切关注机械手的配置,以便处理运动学限制。所提出的预测算法旨在使人类用户不必处理这些限制。首先给出了该算法,并针对平面RR系列机器人的每个个体限制进行了详细介绍。然后提出了为管理同时发生的几种限制而开发的框架。最后,通过实验验证了算法的性能。
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引用次数: 8
Modelling and dynamic analysis of underactuated capsule systems with friction-induced hysteresis 含摩擦迟滞的欠驱动胶囊系统建模与动力学分析
Pub Date : 2016-12-01 DOI: 10.1109/IROS.2016.7759107
Pengcheng Liu, Hongnian Yu, S. Cang
This paper studies modelling and dynamic analysis of underactuated capsule systems exhibiting friction-induced hysteresis. The motion mechanism is novel in utilizing internal centripetal torques generated by a vibration micro-motor mounted on the platform. Up to now, most investigations in frictional interactions towards capsule systems were confined into static or quasi-dynamic circumstance, where it is difficult to facilitate online use and control. It is the first time the dynamic frictional characteristics (non-reversible drooping and hysteresis) are studied towards these systems. An analytical study is primarily conducted to reveal the non-reversible characteristic for the static friction, the pre-sliding regime as well as the pure sliding regime, and the frictional limit boundaries are identified. Subsequently, the studies are mainly focused on dynamic analysis, including friction-driven vibrational responses and qualitative changes induced by control parameter (mass ratio) in capsule dynamics. It is found that the models predict periodic responses for the parameters considered and the average capsule velocity can be controlled through proper tuning of the control parameter around identified control points. The results demonstrate good captions of experimentally observed frictional characteristics, quenching of friction-induced vibrations and satisfaction of energy requirements.
本文研究了具有摩擦滞后的欠驱动胶囊系统的建模和动力学分析。该运动机构利用了安装在平台上的振动微型电机产生的内部向心力矩,是一种新颖的运动机构。到目前为止,对胶囊系统的摩擦相互作用的研究大多局限于静态或准动态环境,难以方便在线使用和控制。这是第一次研究这些系统的动态摩擦特性(不可逆下垂和迟滞)。通过分析研究,初步揭示了静摩擦、预滑动和纯滑动的不可逆特性,并确定了摩擦极限边界。随后,研究主要集中在动力学分析上,包括胶囊动力学中摩擦驱动的振动响应和控制参数(质量比)引起的质变。结果表明,该模型可以预测所考虑参数的周期响应,并且可以通过在确定的控制点周围适当调整控制参数来控制胶囊的平均速度。结果表明,实验观察到的摩擦特性得到了很好的描述,摩擦引起的振动得到了抑制,并且满足了能量要求。
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引用次数: 23
Automatic configuration of ROS applications for near-optimal performance 自动配置ROS应用程序,实现近乎最佳的性能
Pub Date : 2016-12-01 DOI: 10.1109/IROS.2016.7759347
José Cano, Alejandro Bordallo, V. Nagarajan, S. Ramamoorthy, S. Vijayakumar
The performance of a ROS application is a function of the individual performance of its constituent nodes. Since ROS nodes are typically configurable (parameterised), the specific parameter values adopted will determine the level of performance generated. In addition, ROS applications may be distributed across multiple computation devices, thus providing different options for node allocation. We address two configuration problems that the typical ROS user is confronted with: i) Determining parameter values and node allocations for maximising performance; ii) Determining node allocations for minimising hardware resources that can guarantee the desired performance. We formalise these problems with a mathematical model, a constrained form of a multiple-choice multiple knapsack problem. We propose a greedy algorithm for optimising each problem, using linear regression for predicting the performance of an individual ROS node over a continuum set of parameter combinations. We evaluate the algorithms through simulation and we validate them in a real ROS scenario, showing that the expected performance levels only deviate from the real measurements by an average of 2.5%.
ROS应用程序的性能是其组成节点的单个性能的函数。由于ROS节点通常是可配置的(参数化的),因此所采用的具体参数值将决定生成的性能水平。此外,ROS应用程序可以分布在多个计算设备上,从而为节点分配提供了不同的选择。我们解决了典型ROS用户面临的两个配置问题:i)确定参数值和节点分配以实现性能最大化;ii)确定节点分配,以最小化硬件资源,保证期望的性能。我们用一个数学模型来形式化这些问题,这是一个多选题多重背包问题的约束形式。我们提出了一种贪婪算法来优化每个问题,使用线性回归来预测单个ROS节点在参数组合连续统集上的性能。我们通过模拟对算法进行了评估,并在真实的ROS场景中对其进行了验证,结果表明,预期的性能水平与实际测量值的平均偏差仅为2.5%。
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引用次数: 9
Development of a microhand using direct laser writing for indirect optical manipulation 用于间接光学操作的直接激光书写微手的研制
Pub Date : 2016-12-01 DOI: 10.1109/IROS.2016.7759752
E. Avci, Guang-Zhong Yang
In this paper, we propose manipulation ability extension of the optical tweezers by developing microhands, which are to use as end-effectors of the laser beam. First, three different 3D micro-scale handles are designed, then manufactured by the two-photon polymerization method with nano-scale resolution of 100 nm. Second, printed microhands are manipulated by multi-spot laser beam which traps and manipulates numerous objects simultaneously. Third, where direct trapping of the target object is not possible due to target objects' features such as size, shape, material, index of refraction, etc., indirect manipulation of the target microobjects is achieved by using the microhands as an extension of optical tweezers. Finally, three different microhand designs are compared in terms of speed and success rate. Furthermore, suitability of different shapes of microhandles against common usage of spherical shape is discussed.
本文提出了利用微手作为激光末端执行器来扩展光镊的操作能力。首先,设计了三种不同的三维微尺度手柄,然后采用双光子聚合方法制备了分辨率为100 nm的三维微尺度手柄。其次,打印的微手是由多点激光束操纵的,它可以同时捕获和操纵多个物体。第三,由于目标物体的尺寸、形状、材料、折射率等特征,无法直接捕获目标物体,利用微手作为光镊的延伸,可以实现对目标微物体的间接操纵。最后,对三种不同的微手设计在速度和成功率方面进行了比较。此外,还讨论了不同形状的微把手对常用球形微把手的适用性。
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引用次数: 4
Multimodal imitation using self-learned sensorimotor representations 运用自学习感觉运动表征的多模态模仿
Pub Date : 2016-12-01 DOI: 10.1109/IROS.2016.7759582
Martina Zambelli, Y. Demiris
Although many tasks intrinsically involve multiple modalities, often only data from a single modality are used to improve complex robots acquisition of new skills. We present a method to equip robots with multimodal learning skills to achieve multimodal imitation on-the-fly on multiple concurrent task spaces, including vision, touch and proprioception, only using self-learned multimodal sensorimotor relations, without the need of solving inverse kinematic problems or explicit analytical models formulation. We evaluate the proposed method on a humanoid iCub robot learning to interact with a piano keyboard and imitating a human demonstration. Since no assumptions are made on the kinematic structure of the robot, the method can be also applied to different robotic platforms.
尽管许多任务本质上涉及多个模态,但通常只使用来自单一模态的数据来提高复杂机器人对新技能的习得。我们提出了一种方法,使机器人具备多模态学习技能,在多个并发任务空间(包括视觉、触觉和本体感觉)上实现多模态动态模仿,仅使用自学习的多模态感觉运动关系,而无需求解逆运动学问题或明确的分析模型制定。我们在一个仿人iCub机器人上评估了所提出的方法,该机器人学习与钢琴键盘交互并模仿人类演示。由于没有对机器人的运动结构作任何假设,因此该方法也可以应用于不同的机器人平台。
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引用次数: 6
Autonomous fault detection for performance bugs in component-based robotic systems 基于组件的机器人系统性能缺陷的自动故障检测
Pub Date : 2016-12-01 DOI: 10.1109/IROS.2016.7759507
Johannes Wienke, S. Wrede
We present a novel fault detection method for application in component-based robotic systems. In contrast to existing work, our method specifically addresses faults in the software system of the robot using a data-driven methodology which exploits the inter-process communication of the system. This enables an application of the approach without expert knowledge or availability of complex software models. We specifically focus on performance bugs, which slowly degrade the performance of the system and are thereby harder to detect but also most valuable for automatic recovery. Using a data set recorded on a RoboCup@Home platform we demonstrate the performance and applicability of our method and analyze the types of faults that can be detected by the method.
提出了一种适用于基于部件的机器人系统的新型故障检测方法。与现有工作相比,我们的方法使用数据驱动的方法专门解决机器人软件系统中的故障,该方法利用系统的进程间通信。这使得在没有专家知识或复杂软件模型可用性的情况下应用该方法成为可能。我们特别关注性能错误,这些错误会慢慢降低系统的性能,因此很难检测到,但对于自动恢复也是最有价值的。通过在RoboCup@Home平台上记录的数据集,我们证明了该方法的性能和适用性,并分析了该方法可以检测到的故障类型。
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引用次数: 11
期刊
2016 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS)
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