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Friction feedforward compensation and position feedforward in CNC machines

Friction feedforward compensation and position feedforward i...

7th Annual International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology, ECTI-CON 2010

作者： Suteeratanapirom, Wijin Rattanawaorahirankul, Rapeepong Laosapan, Chutima Sanposh, Peerayot Chayopitak, Nattapon Tungpimolrut, Kanokvate Kunieda, Hiroaki TAIST Tokyo Tech ICTES Program Department of Electrical Engineering Kasetsart University 50 Phahonyothin Rd. Ladyao Jatujak Bangkok 10903 Thailand Intelligent Mechatronics Automation Robotics and Control Laboratory Department of Electrical Engineering Kasetsart University 50 Phahonyothin Rd. Ladyao Jatujak Bangkok 10903 Thailand Industrial Control and Automation Laboratory National Electronics and Computer Technology Center 112 Thailand Science Park Phahonyothin Rd. Klong 1 Klong Luang Pathumthani 12120 Thailand Department of Electrical and Electronic Engineering Tokyo Institute of Technology S3-65 2-12-1 Ookayama Meguro-ku Tokyo 152-8550 Japan

ISBN: (纸本)9789746724913

This research proposes a method to eliminate friction effect and reduced tracking error on CNC milling machines. A CNC milling machine has many connected mechanical components which have friction effects such as ball screws and rails. To control servo motors which are used to drive X-Y table in CNC milling machine, the conventional PID controller is widely used. In this research, Panasonic motor driver is set to the torque control mode. To compensate the friction effects, the friction feedforward compensation method is proposed. Moreover, to reduce the position tracking error, position feedforward controller is used. The simulation and implementation of position control in one axis of PID with Friction Feedforward Compensation and Position Feedforward controller (FFC-PFC) are presented.

关键词： Friction

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Determination of circular waits in multiple-reentrant flowlines based on machine-job incidence matrix 10

Determination of circular waits in multiple-reentrant flowli...

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2009 10th European control Conference, ECC 2009

作者： Petrovic, Tamara Bogdan, Stjepan Sindicic, Ivica Laboratory for Robotics and Intelligent Control Systems Department of Control and Computer Engineering University of Zagreb Zagreb Croatia Exor D.o.o Bani 72 Zagreb10000 Croatia

ISBN: (纸本)9783952417393

As the first step in resolving stability of a manufacturing system in the sense of deadlock, calculation of circular waits might involve time and memory consuming calculations. In this paper we propose an efficient method for determination of circular waits in multiple-reentrant flowline class (MRF) of manufacturing systems. We introduce machine-job incidence (MJI) matrix that can be obtained from Steward sequencing matrix and Kusiak machine-part incidence matrix. The method uses index vector and MJI matrix in order to allocate circular wait auxiliary vector. Resources involved in the circular wait are directly computed from the auxiliary vector. Although efficiency of the proposed method has been demonstrated on examples involving single- and multi- part type manufacturing workcells, the method can be used for other discrete event systems as well, as long as the system under study belongs to MRF class. © 2009 EUCA.

关键词： Manufacture

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Robot map building in unknown dynamic environment based on hybrid dezert-smarandache model

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Information Technology Journal 2009年第3期8卷 284-292页

作者： Peng, Li Xinhan, Huang Min, Wang Intelligent Control and Robotics Laboratory Department of Control Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China

In this study, a new method of information fusion DSmT (Dezert-Smarandache Theory) which is extended from Bayesian Theory and Dempster-Shafer Theory (DST) is introduced to solve the problem of robot map building in an unknown dynamic environment. The grid map method is adopted and a sonar sensor mathematical model is constructed based on DSmT. Meanwhile a few of general basic belief assignment functions (gbbaf) are constructed to deal with the uncertain and imprecise, sometimes even high conflicting information obtained by sonar sensors with the application of hybrid DSm model in the system and consideration of characteristics of sonar sensors. At last, Pioneer II mobile robot is used to carry out experiments of map building. The 2D general basic belief assignment (gbba) maps are structured and then correlative 3D gbba maps are built by openGL. The comparison of created ichnography with the real map testified the validity of hybrid DSm model for fusing imprecise information and map building proposed by this research. © 2009 Asian Network for Scientific Information.

关键词： Information fusion

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Fuzzy controller for cooperative object pushing with variable line contact

Fuzzy controller for cooperative object pushing with variabl...

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International Conference on Mechatronics (ICM)

作者： Mahsa Aliakbar Golkar Sarah Taghavi Namin Hossein Aminaiee Control and Intelligent Processing Center of Excellence Robotics and AI Laboratory Department of Electrical and Computer Engineering University of Tehran Iran

Designing an appropriate cooperation protocol in multi-robot systems such as multi-robot object manipulation systems is a challenging task. In this paper designing and implementing a cooperation protocol between two robots pushing an object toward an arbitrary goal configuration is investigated. The proposed method benefits from task decoupling which simplifies the cooperation protocol design. Each robot gets its proper action from a particular fuzzy inference system independently. The fuzzy controllers outputs are low-level robot commands by which the need to a robot path planning algorithm is eliminated. Simulation results show that robots could push the object to the goal configuration cooperatively. Experiments have been conducted to approve the proposed system.

关键词： Fuzzy control Robot kinematics Protocols Fuzzy systems Electric variables control control systems Multirobot systems Path planning Inference algorithms Mobile robots

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Dynamic manipulation of active objects: Modeling and optimization

Dynamic manipulation of active objects: Modeling and optimiz...

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IEEE/ASME (AIM) International Conference on Advanced intelligent Mechatronics

作者： L. Makarem A. Akbarimajd M. Nili Ahmadabadi Robotics and AI Laboratory Control and Intelligent Processing Center of Exellence ECE Department University of Tehran Tehran Iran Faculty of Engineering University of Mohaghegh Ardabil Iran

In this paper the problem of dynamic manipulation of active objects by throwing is studied. Here active object means a multi-body object that can actively move its body parts. The prime reason for selecting this problem is existence of conceptual analogy between it and dynamic walking. The second reason is theoretical attraction in addition to its possible practical applications for manipulation of active objects in space or in micro scales. First the task is decomposed into three distinct phases and it is mathematically modeled. Main constraints such as requirement to hold dynamic grasp are also derived and mapped into the manipulator's configuration space. Then the task is formulated as an optimization problem and a proper cost function in the manipulator's configuration space is presented. Finally this optimization problem is solved for obtaining appropriate trajectories of manipulator's joints in addition to that of the active object. Simulation results in ADAMS verify the developed formulations.

关键词： Manipulator dynamics Legged locomotion Arm intelligent robots Leg Mechatronics Mathematical model Cost function Orbital robotics Motion control

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control system for reactor vessel inspection manipulator

Control system for reactor vessel inspection manipulator

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IEEE Conference on control Technology and Applications (CCTA)

作者： Alan Mutka Ivica Draganjac Zdenko Kovacic Zeljko Postruzin Ranko Munk Faculty of EE&C Department of Control and Computer Engineering LARICS-Laboratory of Robotics and Intelligent Control Systems University of Zagreb Zagreb Croatia Organization of Technology Development and Application HRID Limited Zagreb Croatia

In this paper a system for control and 3D visualization of a manipulator for weld inspection of nuclear reactor vessels is described. Based on client-server TCP/IP software architecture, the presented control system enables an operator to perform the entire inspection procedure remotely over a network, avoiding exposure to dangerous radiation which is commonly present in nuclear reactor environments. The developed graphical user interface provides all necessary tools needed for planning robot scan trajectories, their verification on a virtual 3D model and execution on a remote robot. In addition, the weld inspection process can be observed in parallel on a virtual robot and reactor vessel model and on live video streams captured by two special cameras mounted on the robot.

关键词： control systems Inductors Inspection Welding Parallel robots Visualization TCPIP Software architecture Graphical user interfaces Trajectory

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Multiple Mobile Robots Map Building Based on DSmT

Multiple Mobile Robots Map Building Based on DSmT

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IEEE Conference on robotics, Automation and Mechatronics

作者： Peng Li Xinhan Huang Min Wang Xiangjin Zeng Intelligent Control and Robotics Laboratory Department of Control Science and Engineering Huazhong University of Science and Technology Wuhan China

In this paper, a new multi-robot system framework is introduced to solve the problem of multi-robot map building. Compared with the classical architectures introduced in the literature, this kind of framework enhances overall system performance, especially in reducing calculations and communications, improving real-time performance. Meanwhile a general basic belief assignment function (gbbaf) is constructed to deal with the uncertain and imprecise information obtained by sonar sensors with the application of new information fusion method DSmT (dezert and smarandache theory) in the system and consideration of characteristics of sonar sensors. At last, Pioneer II mobile robots are used to carry out experiments of map building for both single-robot system and multi-robot system. The comparison of created ichnography with the real map testified the validity of DSmT and efficiency of multi-robot system for fusing imprecise information and map building proposed by this research.

关键词： Mobile robots Buildings Multirobot systems Sonar applications Sensor fusion Sensor phenomena and characterization Sensor systems and applications System performance Mobile communication Real time systems

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Is There any Analogy Between Foot Stability and Dynamic Grasp?

Is There any Analogy Between Foot Stability and Dynamic Gras...

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2008 IEEE/RSJ International Conference on intelligent Robots and Systems, Pages 526-1042

作者： Adel Akbarimajd Majid Mili Ahmadabadi Robotics and AI Laboratory Control and Intelligent Processing Center of Excellence ECE Department University of Tehran Iran

ISBN: (纸本)9781424420575

Similarities between foot stability in single support phase of dynamic legged locomotion and dynamic grasp during nonprehensile carrying of an object on a palm are studied. Both foot stability and dynamic grasp conditions are driven mathematically. Then it is shown that these two conditions share the same basic dynamical concepts. It is also revealed that dynamic grasp and foot stability conditions have structurally the same equations when the palm -in object manipulation- and the ground -in legged locomotion- are horizontal. In this situation, parameters of the equations are very similar. It is demonstrated that the effects of violation of foot stability and dynamic grasp conditions are behaviorally the same. In addition to analytical discussions, some simulation examples in ADAMS are provided to validate the presented models and the results.

关键词： Foot Stability analysis Robots Legged locomotion Manipulator dynamics Robot kinematics Sufficient conditions

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Enrichment of qualitative beliefs for reasoning under uncertainty

Enrichment of qualitative beliefs for reasoning under uncert...

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FUSION 2007 - 2007 10th International Conference on Information Fusion

作者： Li, Xinde Huang, Xinhan Dezert, Jean Smarandache, Florentin Intelligent Control and Robotics Laboratory Department of Control Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China ONERA 29 Av. de la Division Leclerc 92320 Châtillon France Department of Mathematics University of New Mexico Gallup NM 87301 United States

ISBN: (纸本)0662478304

This paper deals with enriched qualitative belief functions for reasoning under uncertainty and for combining information expressed in natural language through linguistic labels. In this work, two possible enrichments (quantitative and/or qualitative) of linguistic labels are considered and operators (addition, multiplication, division, etc) for dealing with them are proposed and explained. We denote them qe-operators, qe standing for "qualitative- enriched" operators. These operators can be seen as a direct extension of the classical qualitative operators (q-operators) proposed recently in the Dezert-Smarandache Theory of plausible and paradoxist reasoning (DSmT). q-operators are also justified in details in this paper. The quantitative enrichment of linguistic label is a numerical supporting degree in [0,∞), while the qualitative enrichment takes its values in a finite ordered set of linguistic values. Quantitative enrichment is less precise than qualitative enrichment, but it is expected more close with what human experts can easily provide when expressing linguistic labels with supporting degrees. Two simple examples are given to show how the fusion of qualitative-enriched belief assignments can be done, and a simulation application is given to show its advantage in rough navigation map building of mobile robot.

关键词： Mobile robots

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Learning Cooperative Object Pushing with Variable Contact Point

Learning Cooperative Object Pushing with Variable Contact Po...

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2007 IEEE/ASME International Conference on Advanced intelligent Mechatronics, Pages 805-1210

作者： Abdol Hossein Aminaiee Majid Nili Ahmadabadi Robotics and AI Laboratory Control and Intelligent Processing Center of Excellence Department of Electerical and Computer Engineering University of Tehran

ISBN: (纸本)9781424412631;1424412633

Learning in multi-agent environments where each agent's action directly affects other agents would be an important matter and a complicated task. To reduce the learning time and simplifying the learning process, it is suitable to learn individual skills and then provide cooperation and coordination utilizing the learned individual skills. In the approach proposed in this paper, agents benefit from their individual knowledge obtained in the individual learning phase to cooperate with other agents. Cooperative object pushing system is used as a testbed to our proposed method where cooperation and coordination between agents are needed in these systems. Agents independently learn to push the object to the target by using the proposed fuzzy reinforcement learning method. Agents attain their cooperative behaviors properly making use of the coded knowledge in the Q-table. Simulation and experimental results show that by interpreting the knowledge in the Q-table, agents can achieve high level behaviors with a high degree of cooperation.

关键词： Agents Learning Point contacts pushing variable contact

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