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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Institute of Control, Robotics and Systems
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Journal DOI :
Institute of Control, Robotics and Systems
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Volume & Issues
Volume 10, Issue 12 - Dec 2004
Volume 10, Issue 11 - Nov 2004
Volume 10, Issue 10 - Oct 2004
Volume 10, Issue 9 - Sep 2004
Volume 10, Issue 8 - Aug 2004
Volume 10, Issue 7 - Jul 2004
Volume 10, Issue 6 - Jun 2004
Volume 10, Issue 5 - May 2004
Volume 10, Issue 4 - Apr 2004
Volume 10, Issue 3 - Mar 2004
Volume 10, Issue 2 - Feb 2004
Volume 10, Issue 1 - Jan 2004
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Applications of Fuzzy Logic and Neural Network Technology to Flight Control System Design: an Overview
Journal of Institute of Control, Robotics and Systems, volume 10, issue 2, 2004, Pages 103~111
DOI : 10.5302/J.ICROS.2004.10.2.103
In this survey paper, we attempt to introduce the subjects of fuzzy logic and neural network technology for flight control systems based on completed and ongoing research programs other developed countries. Also, it is prepared with intention of providing the reader with an overview of related topics and a basic concepts of fuzzy logic and neural network control. The focus is on relatively practical control schemes realistically applicable in the area of flight control system design that could find its usage in the near future in our country. It is hoped that this paper will serve as a useful reference and even concepts provide solutions far current problems and future designs.
Nonlinear Discrete-Time Reconfigurable Flight Control Systems Using Neural Networks
Journal of Institute of Control, Robotics and Systems, volume 10, issue 2, 2004, Pages 112~124
DOI : 10.5302/J.ICROS.2004.10.2.112
A neural network based adaptive reconfigurable flight controller is presented for a class of discrete-time nonlinear flight systems in the presence of variations of aerodynamic coefficients and control effectiveness decrease caused by control surface damage. The proposed adaptive nonlinear controller is developed making use of the backstepping technique for the angle of attack, sideslip angle, and bank angle command following without two time separation assumption. Feedforward multilayer neural networks are implemented to guarantee reconfigurability for control surface damage as well as robustness to the aerodynamic uncertainties. The main feature of the proposed controller is that the adaptive controller is developed under the assumption that all of the nonlinear functions of the discrete-time flight system are not known accurately, whereas most previous works on flight system applications even in continuous time assume that only the nonlinear functions of fast dynamics are unknown. Neural networks learn through the recursive weight update rules that are derived from the discrete-time version of Lyapunov control theory. The boundness of the error states and neural networks weight estimation errors is also investigated by the discrete-time Lyapunov derivatives analysis. To show the effectiveness of the proposed control law, the approach is i]lustrated by applying to the nonlinear dynamic model of the high performance aircraft.
Gain Scheduled Fuzzy Control on Aircraft Flight Control
Journal of Institute of Control, Robotics and Systems, volume 10, issue 2, 2004, Pages 125~130
DOI : 10.5302/J.ICROS.2004.10.2.125
This paper describes an approach for synthesizing a Fuzzy Logic Controller(FLC) that combines the benefits of fuzzy logic control and fuzzy logic gain scheduling for the F/A-18 aircraft. Specially, fuzzy rules are utilized on-line to determine the denoralization factor(Κ) of a feedback fuzzy controller based on the dynamic pressure(Q) indicateing the region of the flight envelop the aircraft is operating in. Simulation results demonstrate that the proposed FLC provides excellent compensation for time-varying and/or nonlinear characteristics of the aircraft, and that it also exhibits satisfactory robustness with noisy air data sensors.
Development of Automatic flight Control System for Low Cost Unmanned Aerial Vehicle
Journal of Institute of Control, Robotics and Systems, volume 10, issue 2, 2004, Pages 131~138
DOI : 10.5302/J.ICROS.2004.10.2.131
Automatic flight control system (AFCS) for a low-cost unmanned aerial vehicle is described in this paper. Development process and block diagram of the AFCS are introduced. The flight control law for longitudinal and lateral channel autopilot is designed using optimization process. In this procedure, the performance index is composed of desired location of closed loop system poles and H
norm of the resultant flight control system. This procedure is applied to the autopilot design of an unmanned target vehicle. Performance of the AFCS is evaluated by processor-in-the-loop simulation test and flight test. These results show that the AFCS has acceptable performance fur low cost UAV.
Design of Flight Control System for KARI Unmanned Airship
Journal of Institute of Control, Robotics and Systems, volume 10, issue 2, 2004, Pages 139~144
DOI : 10.5302/J.ICROS.2004.10.2.139
The flight control system designed for an unmanned airship, which is under development by KARI, is in reduced. First, the dynamic characteristics of the airship are addressed, which are fairly different from those of the nominal aircraft. In order to implement autonomous flight for the unmanned airship, flight control logic is designed including autopilot and guidance law. The autopilot is designed under consideration of the velocity region of the unmanned airship. The guidance laws are implemented in main operational modes such as point navigation, station keeping and spiral up/down for emergency return. Their simulation results are also presented in order to validate performances of the flight control system.
Eigenstructure Assignment Control for Linear Continuous-Time Systems with Probabilistic Uncertainties
Journal of Institute of Control, Robotics and Systems, volume 10, issue 2, 2004, Pages 145~152
DOI : 10.5302/J.ICROS.2004.10.2.145
In this paper, an S(stochastic)-eigenvalue and its corresponding S-eigenvector concept for linear continuous-time systems with probabilistic uncertainties are proposed. The proposed concept is concerned with the perturbation of eigenvalues due to the stochastic variable parameters in the dynamic model of a plant. An S-eigenstructure assignment scheme via the Sylvester equation approach based on the S-eigenvalue/-eigenvector concept is also proposed. The proposed control design scheme based on the proposed concept is applied to a longitudinal dynamics of an open-loop-unstable aircraft with possible uncertainties in aerodynamic and thrust effects as well as separate dynamic pressure effects. These results explicitly characterize how S-eigenvalues in the complex plane may impose stability on the system.
Fast Compensator of Periodic Disturbance in Disk Drives
Journal of Institute of Control, Robotics and Systems, volume 10, issue 2, 2004, Pages 153~163
DOI : 10.5302/J.ICROS.2004.10.2.153
The control objective in hard disk drives is to move head as fast as possible to target track and position the head over the center of target track in the presence of external disturbances. The external shock or disk clamping error in manufacturing process causes the disk center to deviate from the disk rotation center. The disk shift acts on the control system as disturbance and degrades severely the performance of disk drives. In this paper, we present a new controller that compensates for the periodic disturbances very fast. The disturbance compensator is arranged in parallel with the state feedback controller. To avoid the interference with the state feedback controller, the compensator creates compensation signal without the feedback of system output until steady state. The pulse type controller is included additionally for improving the transient performance due to initial state. Finally, in order to demonstrate the superior performance of the proposed compensator. we present some experimental results using a commercially available disk drive.
Control for Minimizing Power Consumption in Micro Disk Drives
Journal of Institute of Control, Robotics and Systems, volume 10, issue 2, 2004, Pages 164~170
DOI : 10.5302/J.ICROS.2004.10.2.164
Recently, the demand for micro hard disk drive that provides high-capacity removable storage for handhold electronic devices is growing very rapidly Reducing power consumption is one of the primary control objectives in micro disk drives. The input power delivered to the seek servo system is consumed as heat by the transistors of power amplifier and motor coil resistance. In this paper, we present a new seek servo controller for minimizing the power consumption. We use a Fourier decomposition and nonlinear programming to determine the optimum seek profile that minimizes the power consumption. Also, the trajectory tracking controller is developed for exact tracking of the optimum seek profile. Finally, we present some experimental results using a commercially available micro disk drive in order to demonstrate the superior performance of the proposed controller.
Development of Robust Embedded Measurement System by Using PXI Bus
Journal of Institute of Control, Robotics and Systems, volume 10, issue 2, 2004, Pages 171~177
DOI : 10.5302/J.ICROS.2004.10.2.171
Many instrumentations have been used to acquire the performance data of military systems fer many years. But they could not satisfy environmental specifications(vibration, shock, temperature) and processing speed to apply for the performance test of military systems because of having developed as common vehicles/fixed installation equipments. Thus a new rugged embedded measurement system is required to process large data in high processing speed(Maximum sample rate:1.25Mhz/ch) with rugged environmental specifications. We have developed embedded measurement systems by using PXI(PCI extension for Instrumentation)bus interface composed of a stand alone controller and versatile data acquisition boards(analog, digital, vision, temperature and small signal conditioner) on PC-based environment to solve these problems. Operation programs have been developed using Lab_View and the performances have been validated experimentally.
Design of High-Speed Image Processing System for Line-Scan Camera
Journal of Institute of Control, Robotics and Systems, volume 10, issue 2, 2004, Pages 178~184
DOI : 10.5302/J.ICROS.2004.10.2.178
In this paper, we designed an image processing system for the high speed line-scan camera which adopts the new memory model we proposed. As a resolution and a data rate of the line-scan camera are becoming higher, the faster image processing systems are needed. But many conventional systems are not sufficient to process the image data from the line-scan camera during a very short time. We designed the memory controller which eliminates the time for transferring image data from the line-scan camera to the main memory with high-speed SRAM and has a dual-port configuration therefore the DSP can access the main memory even though the memory controller are writing the image data. The memory controller is implemented by VHDL and Xilinx SPARTAN-IIE FPGA.
Non-linear Data Classification Using Partial Least Square and Residual Compensator
Journal of Institute of Control, Robotics and Systems, volume 10, issue 2, 2004, Pages 185~191
DOI : 10.5302/J.ICROS.2004.10.2.185
Partial least squares(PLS) is one of multiplicate statistical process methods and has been developed in various algorithms with the characteristics of principal component analysis, dimensionality reduction, and analysis of the relationship between input variables and output variables. But it has been limited somewhat by their dependency on linear mathematics. The algorithm is proposed to classify for the non-linear data using PLS and the residual compensator(RC) based on radial basis function network (RBFN). It compensates for the error of the non-linear data using the RC based on RBFN. The experimental result is given to verify its efficiency compared with those of previous works.
Combined Optimal Design with Minimum Phase System
Journal of Institute of Control, Robotics and Systems, volume 10, issue 2, 2004, Pages 192~196
DOI : 10.5302/J.ICROS.2004.10.2.192
A combined optimal design problem is discussed taking a 3-D truss structure as a design object. We use descriptor forms for a controlled object and a generalized plant because the structural parameters appear naturally in these forms. We consider not only the minimum weight design problem for the structure, but also the suppression problem of the effect of disturbances for the control system as the purpose of the design. A numerical example shows the validity of combined optimal design of the structure and control systems. We also consider the validity of the sensor-actuator collocation for the control system design in this paper.
Performance Analysis of Modified TCP/IP for Realtime Control Data Transmission over IEEE-1394 Network
Journal of Institute of Control, Robotics and Systems, volume 10, issue 2, 2004, Pages 197~203
DOI : 10.5302/J.ICROS.2004.10.2.197
A real-time network in a distributed control system plays an important role for the reliable data transmission. Compared to the field-buses used in the past, TCP/IP protocol on the top of Ethered provides a compatibility between applications as well as an economical method to develop softwares. This paper proposes a modified TCP/IP structure for IEEE-1394 network, with which asynchronous and isochronous data transmission is selectively used for the real-time data transmission in a distributed control system. This paper also shows the performance of the proposed protocol by experiments.