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IEEE Conference on control Technology and Applications (CCTA)

作者： Hiroyuki Kawai Toshiyuki Murao Ryuichi Sato Masayuki Fujita Department of Robotics Kanazawa Institute of Technology Ishikawa Japan Design and Engineering Advanced Institute of Industrial Technology Tokyo Japan Department of Mechanical and Control Engineering Tokyo Institute of Technology Tokyo Japan

This paper investigates a passivity-based control for two degree of freedom(2DOF) robot manipulators with antagonistic bi-articular muscles which are passing over adjacent two joints and acting the both joints simultaneously. The manipulator dynamics of three muscle torques, we call the bi-articular manipulator dynamics, is constructed in order to design the control input. Stability analysis with respect to our proposed control law is discussed by using the important property which is concerned with the passivity, although the passivity of the bi-articular manipulator dynamics can not be shown on account of antagonistic bi-articular muscles explicitly. Finally, simulation results are shown in order to confirm the proposed method.

关键词： Muscles Joints Manipulator dynamics Trajectory Simulation

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Fuzzy logic based cycle-to-cycle control of FES-induced swinging motion

Fuzzy logic based cycle-to-cycle control of FES-induced swin...

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International Conference on Electrical, control and Computer engineering (INECCE)

作者： B.S. K. K. Ibrahim M.O. Tokhi M.S. Huq S.C. Gharooni Department of Mechatronics and Robotics Faculty of Electrical & Electronic Engineering University of Tun Hussein Onn Batu Pahat Johor Malaysia Department of Automatic Control and System Engineering University of Sheffield Sheffield UK

FES induced movement control is a significantly challenging area due to complexity and non-linearity of musculo-skeletal system. The goal of this study is to design a cycle-to-cycle control of FES-induced swinging motion. In this approach only the quadriceps muscle is stimulated by controlling the amount of stimulation pulsewidth. This time dependent behaviour is successfully compensated for using a cycle-to cycle fuzzy controller, which computes the amount of knee extension stimulation on the basis of the achieved flexion angle in previous cycles. The capability of fuzzy control in automatic generation of stimulation burst duration is assessed in computer simulations using a musculo-skeletal model. This paper presents the development of a fuzzy logic control scheme based on discrete-time cycle to cycle control strategies without predefined trajectory. The results show the effectiveness of the approach in controlling FES-induced swinging motion.

关键词： Knee Joints Mathematical model Trajectory Computational modeling Muscles Fuzzy logic

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Natural trajectory based FES-induced swinging motion control

Natural trajectory based FES-induced swinging motion control

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International Conference on Mechatronics (ICOM)

作者： B. S. K. K. Ibrahim M. O. Tokhi M. S. Huq S. C. Gharooni Department of Mechatronics and Robotics Faculty of Electrical & Electronic Engineering University of Tun Hussein Onn Batu Pahat Johor Malaysia Department of Automatic Control and System Engineering University of Sheffield Sheffield UK

The use of electrical signals to restore the function of paralyzed muscles is called functional electrical stimulation (FES). FES is a promising method to restore mobility to individuals paralyzed due to spinal cord injury. FES induced movement control is a significantly challenging area, mainly emanating from various characteristics of the underlying physiological/biomechanical system. An approach of fuzzy trajectory tracking control of swinging motion optimized with genetic algorithm is presented. The results show the effectiveness of the approach in controlling FES-induced swinging motion. In this approach only the quadriceps muscle is stimulated to perform the swinging motion by controlling the amount of stimulation pulsewidth.

关键词： Knee Joints Mathematical model Trajectory Genetic algorithms Muscles Optimization

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Passivity-based iterative learning control for visual feedback system

Passivity-based iterative learning control for visual feedba...

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IEEE Conference on control Technology and Applications (CCTA)

作者： Toshiyuki Murao Hiroyuki Kawai Masayuki Fujita Innovation for Design and Engineering Advanced Institute of Industrial Technology Tokyo Japan Department of Robotics Kanazawa Institute of Technology Ishikawa Japan Department of Mechanical and Control Engineering Tokyo Institute of Technology Tokyo Japan

This paper investigates iterative learning control based on passivity for three-dimensional (3-D) visual feedback systems. Firstly, a brief summary of a visual motion observer is given. Next, a pose control error system for iterative learning control that has an output strictly passivity property is constructed. Then, iterative learning control for 3-D visual feedback systems is proposed. The transient response of the proposed control law should be improved because of the repeatability. Convergence analysis of the closed-loop system is discussed based on passivity. Finally, simulation results are shown in order to confirm the proposed method.

关键词： Visualization Cameras control systems Estimation error Observers Jacobian matrices Iterative methods

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Periodic disturbance rejection of a PMSM with adaptive control algorithms

Periodic disturbance rejection of a PMSM with adaptive contr...

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IEEE International Conference on Electric Machines and Drives (IEMDC)

作者： Sebastian Maier Johann Bals Marc Bodson Department of System Dynamics and Control Institute of Robotics and Mechatronics German Aerospace Center Wessling Germany Department of Electrical and Computer Engineering University of Utah Salt Lake UT USA

Permanent magnet synchronous motors (PMSMs) produce a parasitic oscillating torque due to several reasons. This contribution cancels the oscillating torque with adaptive control algorithms. Therefore a mathematical model of the PMSM is necessary. A model with nonlinear dynamics and a Fourier approach for the ripples is used as a mathematical description. Through comparisons between measured data and simulated data it is shown that the model assumptions are valid. The adaptive algorithm is implemented as an add-on controller to the already existing control system which consists of a feedforward part and a basis controller. The challenge is that the closed loop system has a resonant frequency and the algorithm should have the same performance for all frequencies. Experimental results show the performance and convergence of the adaptive algorithm at constant and non constant velocity.

关键词： Torque Mathematical model Transfer functions control systems Feedforward neural networks Equations Adaptation models

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Unknown input reconstruction for nonlinear autonomous switched systems via high-order sliding modes observers

Unknown input reconstruction for nonlinear autonomous switch...

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Annual Conference of Industrial Electronics Society

作者： Hector Rios Jorge Davila Leonid Fridman Department of Control Division of Electrical Engineering Engineering Faculty National Autonomous University of Mexico Mexico Distrito Federal Mexico National Polytechnic Institute Section of Graduate Studies and Research ESIME UPT Mexico Distrito Federal Mexico Department of Automatic Control CINVESTAV IPN Mexico Distrito Federal Mexico Engineering Department of Control and Robotics Division of Electrical Engineering Engineering Faculty National Autonomous University of Mexico Mexico Distrito Federal Mexico

The unknown input identification problem is studied for a class of nonlinear autonomous switched systems. It is proposed a robust observer which is capable of reconstructing the continuous state and the discrete state in the presence of unknown inputs. On the other hand, it is provided a method for identification of unknown inputs using the high frequency equivalent output injection. Simulation results support the proposed method.

关键词： Observers Switches Switched systems Vectors Trajectory

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New simplified model for an under-actuated quadruped robot in bounding motion

New simplified model for an under-actuated quadruped robot i...

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International Conference on control, Instrumentation, and Automation

作者： Hamed Kazemi Vahid Johari Majd Majid M. Moghaddam Intelligent Control Systems Laboratory School of Electrical and Computer Engineering Tarbiat Moalem University Tehran Iran Intelligent Control Systems Laboratory Tarbiat Modares University Tehran Iran Robotics and Mechatronics Laboratory Mechanical Engineering Department Tarbiat Moalem University Tehran Iran Mechanical Engineering Department Tarbiat Modares University Tehran Iran

In this paper, a quadruped robot is studied in bounding motion. A new simplified model of quadruped robot in bounding motion with four actuated and two unactuated joints is developed. The kinetic and potential energies of the under-actuated mechanical model of the quadruped robot are obtained and the dynamics of the robot model is derived using the Lagrangian method. It is shown that the dynamical equation of the proposed simplified model belongs to a class of second-order nonholonomic mechanical systems. The main motivation of this paper is to obtain quadruped model in bounding motion such that one can apply different control methods directly or after transformation in the obtained dynamic equations. Utilizing MATLAB, dynamics of the planar model has been simulated in backward and forward states. Physical parameters of the Little-Dog robot as an instance of the quadruped robot are considered in simulation The simulation is without control and therefore is unstable but it illustrates robot's manner in bounding motion before instability.

关键词： Mathematical model Legged locomotion Dynamics Equations Joints Robot kinematics

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Lyapunov Stability Analysis of a Twisting Based control Algorithm for Systems with Unmatched Perturbations

Lyapunov Stability Analysis of a Twisting Based Control Algo...

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IEEE Conference on Decision and control

作者： Antonio Estrada Antonio Loria Raul Santiesteban Leonid Fridman Universidad Nacional Autonoma de Mexico (UNAM) Department of Control Engineering and Robotics Engineering Faculty. C.P. 04510 Mexico D.F. LSS-SUPELEC Gif-sur-Yvette France

ISBN: (纸本)9781612848006

In this note, we present a result on stabilization of nonlinear strict-feedback systems affected by unknown perturbations when a control based on the so-called twisting algorithm, a second-order sliding mode controller, is applied. The novelty of the note relies in the stability analysis of the closed loop system. It follows along similar lines as for well-established theorems for nonlinear time-varying systems in cascade, with continuous right-hand sides. However, the class of systems that we deal with are discontinuous and perturbed. Although the presented analysis is aimed to perturbed second-order systems in strict feedback form, the purpose of this note is to settle the basis for a methodological stability analysis approach for higher-order systems. An illustrative example is provided.

关键词： Computer algorithms Stability analysis Note Taking Nonlinear time-varying system second order system Closed loop systems perturbation INCOMPATIBLE Lyapunov methods Instruction repertory Novelty Feedback Discontinuous Higher-order system cascades

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Gearbox Ripple Rejection of Robots Using Observer and Adaptive control Theory

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IFAC Proceedings Volumes 2011年第1期44卷 893-898页

作者： Sebastian Maier Johann Bals Marc Bodson Department of System Dynamics and Control Institute of Robotics and Mechatronics German Aerospace Center (DLR) 82234 Wessling Germany Muenchner Str. 20 Department of Electrical and Computer Engineering University of Utah 50 S Central Campus Dr. Salt Lake City UT 84112 USA

Abstract Robots are often run with permanent magnet synchronous motors (PMSM) with a high ratio gearbox. Both parts can produce parasitic oscillations (ripples), which let the robot shake at tool center point. The gearbox ripple problem is more complicated to be solved with control theory because only motor side sensors should be used. Due to the internal model principle gearbox side information is necessary to solve the problem. The first algorithm uses an observer to get gearbox side information where the second algorithm uses a gearbox side rate sensor. The algorithms are tested with a nonlinear SISO problem and with a nonlinear MIMO system. In both cases the ripples are canceled with an adaptive controller which estimates the phase and magnitude of the ripple. This adaptive controller is designed separately and is added to the existing basis controller. The algorithms are tested in simulation and on a testbed, which is an industrial application.

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An analysis of sensitivity distribution using two differential excitation potentials in ECT

An analysis of sensitivity distribution using two differenti...

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International Conference on Sensing Technology, ICST

作者： Elmy Johana Mohamad Omar M. Faizan Marwah Ruzairi Abdul Rahim Leow Pei Ling Department of Mechatronic and Robotics Engineering Faculty of Electrical and Electronic Engineering Universiti Tun Hussein Onn Malaysia Johor Malaysia Department of Manufacturing and Industrial Engineering Faculty of Mechanical and Manufacturing Engineering Universiti Tun Hussein Onn Malaysia Johor Malaysia Process Tomography Research Group (PROTOM) Department of Control & Instrumentation Engineering Faculty of Electrical Engineering Universiti Teknologi Malaysia Skudai Johor Malaysia

The investigation of this work is to analysis the sensitivity distributions using two differential excitation potentials, in order to improve the situation of: (1) non-uniform sensitivity distribution: (2) less sensitivity in the central area and (3) non-linear change in ECT (Electrical Capacitance Tomography) system. Simulation using COMSOL Multiphysics is developed in order to obtain the changes in capacitance inter-electrodes and the permittivity of the dielectric material when two differential excitation potentials were injected. The MATLAB simulation is used to obtain the sensitivity distribution inside the closed pipe from the sensor. Generated phantoms and measured values are presented. Simulation is verified using available experimental data through the existing system, 16- segmented ECT sensor electrodes by PROTOM Research Group UTM, MALAYSIA. By using this technique the linear relationship between the capacitances measured to inter-electrodes and the permittivity dramatically improved and the sensitivity distribution for an opposing electrode pair was increased thus gives the sensitivity distribution in the central area increased. The use of this technique does increase the level of detection signals and the SNR(signal noise to ratio) compared to those achieved using standard single-voltage source method.

关键词： Electrodes Capacitance Electric potential Sensitivity Permittivity Capacitance measurement Image reconstruction

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