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作者： Peña Fernández, C.A. Cerqueira, J.J.F. Lima, A.M.N. Robotics Laboratory Department of Electrical Engineering Federal University of Bahia Rua Aristides Novis 02 Federação Salvador Bahia40210-630 Brazil Center of Electrical and Computer Engineering Department of Electrical Engineering Federal University of Campina Grande Rua Agripio Veloso 882 Universitário Campina Grande Paraíba58429-970 Brazil

In work reported here, it is proposed a method to reduce the effects of slipping and skidding in WMRs not exactly satisfying kinematic constraints. It is studied the case for WMRs whose kinematic constraints are violated owing to deformability or flexibility. To this end, it is considered the static-state linearization whose robustness will be based on singular perturbation methods and an auxiliary control law that is modeled on a suitable transformation for curvilinear coordinates. In results will be seen that the tracking error converges to small ball of the origin whose radius can be adjusted by a known function that depends on the slipping and skidding variations. © 2015, IFAC (International Federation of Automatic Control) Hosting by Elsevier Ltd. All rights reserved.

关键词： Mobile robots

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Control of wheeled mobile robots singularly perturbed by using the slipping and skidding variations: Curvilinear coordinates approach (Part II)

Control of wheeled mobile robots singularly perturbed by usi...

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作者： Peña Fernández, C.A. Cerqueira, J.J.F. Lima, A.M.N. Robotics Laboratory Department of Electrical Engineering Federal University of Bahia Rua Aristides Novis 02 Federacao Salvador Bahia40210-630 Brazil Center of Electrical and Computer Engineering Department of Electrical Engineering Federal University of Campina Grande Rua Agripio Veloso 882 Universitário Campina Grande Paraíba58429-970 Brazil

关键词： Mobile robots

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Trajectory control of wheeled mobile robots not satisfying ideal velocity constraints by using slipping and skidding variations: A singular perturbation approach 1

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11th Latin-American robotics Symposium on robotics, LARS 2014

作者： Peña Fernández, C.A. Cerqueira, J.J.F. Lima, A.M.N. Robotics Laboratory - Department of Electrical Engineering Federal University of Bahia Rua Aristides Novis 02 Federação Bahia Salvador40210-630 Brazil Center of Electrical and Computer Engineering Department of Electrical Engineering Federal University of Campina Grande Rua Agripio Veloso 882 Universitário Paraíba Campina Grande58429-970 Brazil

ISBN: (数字)9783662481349

ISBN: (纸本)9783662481332

Control of wheeled mobile robots (WMRs) on trajectory tracking problems has given rise to an abundant proposals at recent years. Normally, WMRs are subject to phenomena like sliding, deformability or flexibility, which are strongly associated with violation of velocity constraints. Here, we propose a method to reduce the effects of slipping and skidding in WMRs by using an auxiliary control law whose robustness is based on slipping and skidding variations. It is considered the control law based on state-feedback linearization whose robustness with respect to the deformability of wheel will be based on singular perturbation methods. The tracking problem is studied by using the auxiliary control law proposed in a feedforward loop. The results show that the law proposed is robust to slipping and skidding and that tracking error converges toward zero. © Springer-Verlag Berlin Heidelberg 2015.

关键词： Mobile robots

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Autonomous robotic refueling of an unmanned surface vehicle in varying sea states

Autonomous robotic refueling of an unmanned surface vehicle ...

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IEEE/RSJ International Conference on Intelligent Robots and Systems

作者： G. P. Scott C. G. Henshaw I. D. Walker B. Willimon Spacecraft Engineering Department Robotics researchers with the Naval Research Laboratory Washington DC Department of Electrical and Computer Engineering Clemson University Clemson SC

In an effort to improve sailor safety during underway replenishment on the open sea, a robotic refueling system has been developed to autonomously refuel unmanned surface vehicles (USVs). The Rapid Autonomous Fuel Transfer (RAFT) project has demonstrated a methodology that could be used on the open water to autonomously refuel Navy vessels at significant sea states. The prototype refueling system is made up of two robotic arms: a rigid and precise industrial robotic manipulator to pinpoint the location of the target fuel tank and a novel soft pneumatic arm (Octarm) to provide compliant and safe contact with the USV. At the end of the Octarm, a magnetic end effector was designed (patent pending) to transfer a refueling "puck" from the robotic system to the target fuel tank. Acting under manual control or autonomously through visual tracking techniques, the robotic refueling system was shown to effectively transfer fuel to the target US Navy Sea Fox vessel under sea state 3.25 conditions at the US Army Aberdeen Test Center. The results demonstrate the feasibility of using a robotic solution to allow autonomous shore-to-ship or ship-to-USV refueling. It also illustrates the benefits and challenges of future robotic ship-to-USV refueling operations. This represents the first demonstrated use of a robotic system for fluid transfer to vessels in active sea states. This paper describes the design, development, and demonstration of the prototype autonomous refueling system.

关键词： Fuels Manipulators Service robots Pneumatic systems Robot kinematics Vehicles

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An Analysis of Sampling Effect on Bilateral Teleoperation System Transparency

An Analysis of Sampling Effect on Bilateral Teleoperation Sy...

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第三十四届中国控制会议

作者： Ting YANG Yi Li FU Mahdi TAVAKOI State Key Laboratory of Robotics and Systems Harbin Institute of Technology Department of Electrical and Computer Engineering University of Alberta

ISBN: (纸本)9781467374439

The performances of continuous-time controlled and discrete-time controlled bilateral teleoperation systems are mathematically and experimentally studied and compared. The results show that under stability conditions, continuous-time controlled teleoperation systems have hybrid matrix parameters that are closer to their ideal values than their discrete-time controlled counterparts. This means better force tracking and position tracking performance under continuous-time control, which can lead to better task performance.

关键词： Bilateral teleoperation,hybrid parameters,discrete-time control,continuous-time control,system performance

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FPAA-based Control of Bilateral Teleoperation Systems

FPAA-based Control of Bilateral Teleoperation Systems

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第三十四届中国控制会议

作者： Ting YANG Yi Li FU Mahdi TAVAKOI State Key Laboratory of Robotics and Systems Harbin Institute of Technology Department of Electrical and Computer Engineering University of Alberta

ISBN: (纸本)9781467374439

Discretizing the continuous-time controller of a master-slave teleoperation system can simplify control implementation. However, in teleoperation systems, discrete-time control can cause a performance degradation compared to continuous-time control. In digitally controlled bilateral teleoperation systems, there exist stability-imposed bounds on the gains of the discrete-time controller and the sampling period, and a trade-off between the two. This means that given a sampling period, it is impossible for the discretized controller to have gains above a threshold, which may well be necessary for successful performance of teleoperated tasks requiring highly accurate master-slave position tracking. In a teleoperation system with analog controller, however, stability does not impose any upper bound on the control gains, thus facilitating the performance of tasks that do require highly accurate master-slave position tracking. Inspired by this advantage of analog control, in this paper we develop a Field Programmable Analog Arrays(FPAA) based controller for bilateral teleoperation, which can achieve higher control gain than its discrete-time counterpart. We present the results of a user study measuring the human performance for a task involving flipping a stiff switch through a teleoperation system. We experimentally show that large sampling periods, necessitating low control gains for maintaining stability, lead to unacceptable task performance. We then show that humans can successfully perform the same task with the FPAA-based controller for the teleoperation system.

关键词： Bilateral teleoperation,stability,discrete-time control,FPAA-based control,task performance

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Nanoscale monitoring of drug actions on cell membrane using atomic force microscopy

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中国药理学报（英文版） 2015年第7期36卷 769-782页

作者： Mi LI Lian-qing LIU Ning XI Yue-chao WANG State Key Laboratory of Robotics Shenyang Institute of Automation Chinese Academy of Sciences Shenyang 110016 China State Key Laboratory of Robotics Shenyang Institute of Automation Chinese Academy of Sciences Shenyang 110016 China Department of Electrical and Computer Engineering Michigan State University East Lansing MI 48824 USA

Knowledge of the nanoscale changes that take place in individual cells in response to a drug is useful for understanding the drug action. However, due to the lack of adequate techniques, such knowledge was scarce until the advent of atomic force microscopy (AFM), which is a multifunctional tool for investigating cellular behavior with nanometer resolution under near-physiological conditions. In the past decade, researchers have applied AFM to monitor the morphological and mechanical dynamics of individual cells following drug stimulation, yielding considerable novel insight into how the drug molecules affect an individual cell at the nanoscale. In this article we summarize the representative applications of AFM in characterization of drug actions on cell membrane, including topographic imaging, elasticity measurements, molecular interaction quantification, native membrane protein imaging and manipulation, etc. The challenges that are hampering the further development of AFM for studies of cellular activities are aslo discussed.

关键词： atomic force microscopy single-cell technique nanometer scale drug-target interaction cell mechanics cell elasticity

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Robotic Software System for the Disaster Circumstances: System of Team KAIST in the DARPA robotics Challenge Finals

Robotic Software System for the Disaster Circumstances: Syst...

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IEEE-RAS International Conference on Humanoid Robots

作者： Jeongsoo Lim Inwook Shim Okkee Sim Hyunmin Joe Inhyeok Kim Jungho Lee Jun-Ho Oh Humanoid Research Center School of Mechanical Aerospace & Systems Engineering Department of Mechanical Engineering Korea Advanced Institute of Science and Technology Robotics and Computer Vision Laboratory Department of Electrical Engineering College of Information Science and Technology Korea Advanced Institute of Science and Technology Rainbow Co.

ISBN: (纸本)9781479968862

We developed a software system for operating the humanoid robot DRC-HUBO+ in disaster circumstances that the US Defense Advanced research Projects Agency suggested. This system was developed under the consideration of the stability of whole system, the systemic software environment for multiple developers, and the recovery routine when the system encounters a seriously abnormal situation. With these design goals, we devised our strategy for three domains: system, vision, and communication. Following the strategy we made two software frameworks (PODO and VPC) and one logical flow of data for remote process management. With this software system, we conducted all Tasks in the DARPA robotics Challenge Finals, and we won the competition.

关键词： Software systems DARPA design target robotics Disasters Religious Missions flow datas

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Transient Electronics: Dry Transient Electronic Systems by Use of Materials that Sublime (Adv. Funct. Mater. 12/2017)

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Advanced Functional Materials 2017年第12期27卷

作者： Bong Hoon Kim Jae‐Hwan Kim Luana Persano Suk‐Won Hwang Seungmin Lee Jungyup Lee Yongjoon Yu Yongseon Kang Sang M. Won Jahyun Koo Youn Kyoung Cho Gyum Hur Anthony Banks Jun‐Kyul Song Phillip Won Young Min Song Kyung‐In Jang Daeshik Kang Chi Hwan Lee Dario Pisignano John A. Rogers Departments of Materials Science and Engineering Biomedical Engineering Chemistry Neurological Surgery Mechanical Engineering Electrical Engineering and Computer Science Simpson Querrey Institute and Feinberg Medical School Center for Bio‐Integrated Electronics Northwestern University Evanston IL 60208 USA Department of Materials Science and Engineering Frederick Seitz Materials Research Laboratory University of Illinois at Urbana‐Champaign Urbana IL 61801 USA NEST Istituto Nanoscienze‐CNR Piazza S. Silvestro 12 I‐56127 Pisa Italy KU‐KIST Graduate School of Converging Science and Technology Korea University Seoul 02841 Republic of Korea School of Electrical Engineering and Computer Science Gwangju Institute of Science and Technology (GIST) Gwangju 61005 Republic of Korea Department of Robotics Engineering Daegu Gyeongbuk Institute of Science and Technology (DGIST) Daegu 42988 Republic of Korea Department of Mechanical Engineering Ajou University Suwon 443–749 Republic of Korea Weldon School of Biomedical Engineering School of Mechanical Engineering The Center for Implantable Devices and Birck Nanotechnology Center Purdue University West Lafayette IN 47907 USA Dipartimento di Matematica e Fisica “Ennio De Giorgi” Università del Salento Via Arnesano I‐73100 Lecce Italy

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Real-time experimental analysis for protection and control of smart substations

Real-time experimental analysis for protection and control o...

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IEEE PES Conference on Innovative Smart Grid Technologies (ISGT Latin America)

作者： Mehmet H. Cintuglu Ricardo de Azevedo Tan Ma Osama A. Mohammed Energy Systems Research Laboratory Department of Electrical and Computer Engineering Florida International University Miami FL

ISBN: (纸本)9781467366069

To reach the future smart grid vision, comprehensively equipped test beds are required for identification of the vulnerabilities, security concerns and the impact analysis of the new control and protection concepts. The future smart substations are expected to have enhanced capabilities such as wide-area situational awareness, interoperability, and self-sustained generation capability to achieve resilient power grid goals. Prior to field deployment, any new protection and control capabilities should pass rigorous tests. With this motivation, this paper presents a real-time experimental analysis for protection and control of smart substations in a state-of the-art test bed platform. A coordinated wide-area protection approach is proposed for transmission and distribution levels enabling interoperability between IEDs at different layers. An aggregated distributed generation and storage dispatch optimization method is proposed for self-sustained smart substations in case of outage such as a blackout situation. In order to validate the proposed protection and control methods, experimental results are given.

关键词： Substations Optimization IEC Standards Smart grids Interoperability Real-time systems Protocols

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