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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Institute of Control, Robotics and Systems
Journal Basic Information
Journal DOI :
Institute of Control, Robotics and Systems
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Volume & Issues
Volume 9, Issue 12 - Dec 2003
Volume 9, Issue 11 - Nov 2003
Volume 9, Issue 10 - Oct 2003
Volume 9, Issue 9 - Sep 2003
Volume 9, Issue 8 - Aug 2003
Volume 9, Issue 7 - Jul 2003
Volume 9, Issue 6 - Jun 2003
Volume 9, Issue 5 - May 2003
Volume 9, Issue 4 - Apr 2003
Volume 9, Issue 3 - Mar 2003
Volume 9, Issue 2 - Feb 2003
Volume 9, Issue 1 - Jan 2003
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Exponential Stabilization of an Axially Translating Tensioned Beam by Boundary Control Together with a Passive Damper
Journal of Institute of Control, Robotics and Systems, volume 9, issue 1, 2003, Pages 1~9
DOI : 10.5302/J.ICROS.2003.9.1.001
An active control of the lateral vibration of a translating tensioned Euler-Bemoulli beam is investigated. The dynamics of the translating tensioned beam is represented by a non-linear hyperbolic partial differential equation. A right boundary control law based upon the Lyapunov`s second method is derived. The transverse motion of the translating tensioned beam is controlled by a time-varying external force besides a passive damping applied at the right boundary. Exponential stability of the closed loop system is proved. Simulation results demonstrate the effectiveness of the proposed controller.
Control For Minimizing Settling Time in High-Density Disk Drives
Journal of Institute of Control, Robotics and Systems, volume 9, issue 1, 2003, Pages 10~21
DOI : 10.5302/J.ICROS.2003.9.1.010
During seek operation in disk drives, the recording head is moved toward desired track by seek servo controller and then is settled onto the center of the desired track by settling servo controller. If the head speed at the start of settling servo control is not slow, it may produce overshoot relative to the center of track and thus extend the settling time. The degradation in settling performance will be more severe as the track width becomes smaller for higher density of data storage. We design a new settling servo controller for minimizing settling time based on the pole-zero cancellation. In order to cancel slow poles in settling response, we apply discrete pulse signals to the system in addition to the state feedback control. For exact pole-zero cancellation, we consider the dynamics of power amplifier used for actuator current regulation and the effects of delay in control action. In addition, we present system parameter identification algerian for the robustness of our controller to system parameter variation. In order to demonstrate the practical use of our controller, we present experimental results obtained by using a commercially available disk drive.
Precision Position Control of Piezoactuator Using Inverse Hysteresis Model and Neuro-PID Controller
Journal of Institute of Control, Robotics and Systems, volume 9, issue 1, 2003, Pages 22~29
DOI : 10.5302/J.ICROS.2003.9.1.022
A piezoelectric actuator yields hysteresis effect due to its composed ferroelectric. Hysteresis nonlinearty is neglected when a piezoelectric actuator moves with short stroke. However when it moves with long stroke and high frequency, the hysteresis nonlinearty can not be neglected. The hysteresis nonlinearty of piezoelectric actuator degrades the control performance in precision position control. In this paper, in order to improve the control performance of piezoelectric actuator, an inverse modeling scheme is proposed to compensate the hysteresis nonlinearty. And feedforward - feedback controller is proposed to give a good tracking performance. The Feedforward controller is an inverse hysteresis model, base on neural network and the feedback control is implemented with PID control. To show the feasibility of the proposed controller and hysteresis modeling, some experiments have been carried out. It is concluded that the proposed control scheme gives good tracking performance.
A Driving and Pick-Off Method of Vibratory Gyroscopes Using Electromagnetic Force
Journal of Institute of Control, Robotics and Systems, volume 9, issue 1, 2003, Pages 30~36
DOI : 10.5302/J.ICROS.2003.9.1.030
Driving and pick-off using electromagnetic force for a cylindrical vibratory gyroscope is considered. A gyroscope consisting of thin cylindrical vibrating element and electromagnetic drive and pick-off element is designed, fabricated and tested. The results of the proposed pick-off method were compared with the results of the highly precise laser interferometer and eddy current sensor as it was used as the reference standard. Through the experiment, it is verified that the proposed electromagnetic driving and pick-off method can be an effective alternative to conventional electrostatic or piezo-electric methods.
A Study on the Improvement of Autofocusing Using Image Resampling Method
Journal of Institute of Control, Robotics and Systems, volume 9, issue 1, 2003, Pages 37~43
DOI : 10.5302/J.ICROS.2003.9.1.037
A faster autofocusing method is proposed. The searching speed of microscope camera is limited by the long focusing time due to too much sampled digital image data. The improvement of autofocusing speed based on the down sampling is discussed analytically and is proved by experiments. The anticipated aliasing is found negligible in shilling rate of focus measure.
Estimation of Miniature Train Location by Color Vision for Development of an Intelligent Railway System
Journal of Institute of Control, Robotics and Systems, volume 9, issue 1, 2003, Pages 44~49
DOI : 10.5302/J.ICROS.2003.9.1.044
This paper describes a method of estimating miniature train location by color vision for development of an intelligent railway system model. In the teal world, to control trains automatically, GPS(Global Positioning System) is indispensable to determine the location of trains. A color vision system was used for estimating the location of trains in an indoor experiment. Two different rectangular color bars were attached to the top of each train as a means of identifying them. Several trains were detected where they were located on the track by color feature, geometric features and moment invariant, and tracked simultaneously. In the experiment the identity, location and direction of each train were estimated and transferred to the control computer using serial communication. Processing speed of up to 8 frames/sec could be achieved, which was enough speed for the real-time train control.
Image Reconstruction Using Genetic Algorithm in Electrical Impedance Tomograghy
Journal of Institute of Control, Robotics and Systems, volume 9, issue 1, 2003, Pages 50~56
DOI : 10.5302/J.ICROS.2003.9.1.050
In electrical impedance tomography(EIT), various image reconstruction algorithms have been used in order to compute the internal resistivity distribution of the unknown object with its electric potential data at the boundary. Mathematically the EIT image reconstruction algorithm is a nonlinear ill-posed inverse problem. This paper presents a new combined method based on genetic algorithm(GA) and modified Newton-Raphson(mNR) algorithm via two-step approach for the solution of the static EIT inverse problem. In the first step, each mesh is classified into three mesh groups: target, background, and temporary groups. The mNR algorithm can be used to determine the region of group. In the second step, the values of these resistivities are determined using genetic algorithm. Computer simulations with the 32 channels synthetic data show that the spatial resolution of reconstructed images by the proposed scheme is improved compared to that of the mNR algorithm at the expense of increased computational burden.
A Study on Coagulant Feeding Control of the Water Treatment Plant Using Intelligent Algorithms
Journal of Institute of Control, Robotics and Systems, volume 9, issue 1, 2003, Pages 57~62
DOI : 10.5302/J.ICROS.2003.9.1.057
It is difficult to determine the feeding rate of coagulant in the water treatment plant, due to nonlinearity, multivariables and slow response characteristics etc. To deal with this difficulty, the genetic-fuzzy system genetic-equation system and the neural network system were used in determining the feeding rate of the coagulant. Fuzzy system and neural network system are excellently robust in multivariables and nonlinear problems. but fuzzy system is difficult to construct the fuzzy parameter such as the rule table and the membership function. Therefore we made the genetic-fuzzy system by the fusion of genetic algorithms and fuzzy system, and also made the feeding rate equation by genetic algorithms. To train fuzzy system, equation parameter and neural network system, the actual operation data of the water treatment plant was used. We determined optimized feeding rates of coagulant by the fuzzy system, the equation and the neural network and also compared them with the feeding rates of the actual operation data.
A New 6-DOF Parallel Haptic Device: Optimum Design and Analysis
Journal of Institute of Control, Robotics and Systems, volume 9, issue 1, 2003, Pages 63~72
DOI : 10.5302/J.ICROS.2003.9.1.063
A new 6-DOF parallel haptic device is proposed. Many existing haptic devices require large power due to having floating actuator and also have small workspaces. The proposed new mechanism can generate 6-DOF reflecting force. This device is relatively light by employing non-floating actuators and has large workspace. Kinematic analysis and kinematic optimal design is performed for this mechanism. Dexterous workspace, global isotropic index, and global maximum force transmission ratio are considered as kinematic design indices. To deal with such multi-criteria optimization problem. composite design index is employed. For the given operational specifications, actuator sizing for this mechanism is also carried out.
Design of Autonomous Stair Robot System
Journal of Institute of Control, Robotics and Systems, volume 9, issue 1, 2003, Pages 73~81
DOI : 10.5302/J.ICROS.2003.9.1.073
An autonomous stair robot recognizing the stair, and climbing up and down the stair by utilizing a robot vision, photo sensors, and appropriate climbing algorithm is introduced. Four arms associated with four wheels make the robot climb up and down more safely and faster than a simple track typed robot. The robot can adjust wheel base according to the stair width, hence it can adopt to a variable width stair with different algorithms in climbing up and down. The command and image data acquired from the robot are transferred to the main computer through RF wireless modules, and the data are delivered to a remote computer via a network communication through a proper data compression, thus, the real time image monitoring is implemented effectively.
Robust Motion Controller Design for Flexible XY Positioning Systems
Journal of Institute of Control, Robotics and Systems, volume 9, issue 1, 2003, Pages 82~89
DOI : 10.5302/J.ICROS.2003.9.1.082
A robust motion control method is proposed fur the point-to-point position control of a XY positioning system which consists of a base cart, elastic ben and moving mass. The horizontal motion controller consists of the feedforward controller to suppress the single mode vibration of the elastic beam and the feedback controller to get the high-accuracy positioning performance of the base cart. Input preshaping vibration suppression method based on system modeling with analytic frequency equation is proposed and integrated into the robust internal-loop compensator(RIC) to increase the robustness of the whole closed-loop system The vertical motion controller is proposed based on the dual RIC structure. Through experiments, it is shown that the proposed method can stabilize the system and suppress the vibration in the presence of uncertainties and disturbances
Performance Evaluation of Switched Ethernet for Real-time Industrial Communication
Journal of Institute of Control, Robotics and Systems, volume 9, issue 1, 2003, Pages 90~98
DOI : 10.5302/J.ICROS.2003.9.1.090
The real-time industrial network, often referred to as fieldbus, is an important element for building automated manufacturing systems. Thus, in order to satisfy the real-time requirements of field devices, numerous fieldbus protocols have been announced. But the application of fieldbus has been limited due to the high cost of hardware and the difficulty in interfacing with multi-vendor products. Therefore, as an alternative to fieldbus, the computer network technology, especially Ethernet (IEEE 802.3), is being adapted to the industrial environment. However, the crucial technical obstacle for Ethernet is its non-deterministic behavior that makes it inadequate for industrial applications where real-time data have to be delivered within a certain time limit. Recently, the development of switched Ethernet shows a very promising prospect for industrial application due to the elimination of uncertainties in the network operation resulting in much improved performance. This paper focuses on the application of the switched Ethernet for industrial communications. More specifically, this paper presents an analytical and experimental performance evaluation of the switched Ethernet and a case study about networked control system.