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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 21, Issue 12 - Dec 2015
Volume 21, Issue 11 - Nov 2015
Volume 21, Issue 10 - Oct 2015
Volume 21, Issue 9 - Sep 2015
Volume 21, Issue 8 - Aug 2015
Volume 21, Issue 7 - Jul 2015
Volume 21, Issue 6 - Jun 2015
Volume 21, Issue 5 - May 2015
Volume 21, Issue 4 - Apr 2015
Volume 21, Issue 3 - Mar 2015
Volume 21, Issue 2 - Feb 2015
Volume 21, Issue 1 - Jan 2015
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Velocity Control of Permanent Magnet Synchronous Motors using Model Predictive and Sliding Mode Cascade Controller
Lee, Ilro ; Lee, Youngwoo ; Shin, Donghoon ; Chung, Chung Choo ;
Journal of Institute of Control, Robotics and Systems, volume 21, issue 9, 2015, Pages 801~806
DOI : 10.5302/J.ICROS.2015.15.0094
In this paper, we propose cascade-form velocity controller for a permanent magnet synchronous motor (PMSM). The proposed controller consists of a sliding-mode controller (SMC) for the inner current control loop and a model-predictive controller (MPC) for the outer velocity control loop. With SMC, we can ensure that the current tracking error always converges to zero in finite time. The SMC is designed to track the desired currents. Additionally, with MPC, we can obtain the optimal velocity control input which minimizes the cost function. Constraint conditions for input and input variation are included in the MPC design. The simulation results are included to validate the performance of the proposed controller.
A Finite Impulse Response Fixed-lag Smoother for Discrete-time Nonlinear Systems
Kwon, Bo-Kyu ; Han, Sekyung ; Han, Soohee ;
Journal of Institute of Control, Robotics and Systems, volume 21, issue 9, 2015, Pages 807~810
DOI : 10.5302/J.ICROS.2015.15.0060
In this paper, a finite impulse response(FIR) fixed-lag smoother is proposed for discrete-time nonlinear systems. If the actual state trajectory is sufficiently close to the nominal state trajectory, the nonlinear system model can be divided into two parts: The error-state model and the nominal model. The error state can be estimated by adapting the optimal time-varying FIR smoother to the error-state model, and the nominal state can be obtained directly from the nominal trajectory model. Moreover, in order to obtain more robust estimates, the linearization errors are considered as a linear function of the estimation errors. Since the proposed estimator has an FIR structure, the proposed smoother can be expected to have better estimation performance than the IIR-structured estimators in terms of robustness and fast convergence. Additionally the proposed method can give a more general solution than the optimal FIR filtering approach, since the optimal FIR smoother is reduced to the optimal FIR filter by setting the fixed-lag size as zero. To illustrate the performance of the proposed method, simulation results are presented by comparing the method with an optimal FIR filtering approach and linearized Kalman filter.
Enhanced Performance of Disturbance Observer by Embedding a Filter and Its Application to Hard Disk Drive
Ha, Jongsoo ; Park, Gyunghoon ; Shim, Hyungbo ;
Journal of Institute of Control, Robotics and Systems, volume 21, issue 9, 2015, Pages 811~817
DOI : 10.5302/J.ICROS.2015.15.0054
In this paper, we present a new control structure which is obtained by adding an appropriately designed filter to a conventional disturbance observer. The proposed controlled system preserves advantages of a system with the conventional disturbance observer; disturbance rejection and nominal performance recovery. In particular, by embedding the filter, the disturbance rejection performance is enhanced compared with that of the classical disturbance observer-based controlled system. Moreover, we suggest a condition for the robust internal stability of the considered system in this paper. Simulation results regarding an effect of relatively high-frequency disturbance on hard disk drive are also presented.
A Study on Vehicle Ego-motion Estimation by Optimizing a Vehicle Platform
Song, Moon-Hyung ; Shin, Dong-Ho ;
Journal of Institute of Control, Robotics and Systems, volume 21, issue 9, 2015, Pages 818~826
DOI : 10.5302/J.ICROS.2015.15.0031
This paper presents a novel methodology for estimating vehicle ego-motion, i.e. tri-axis linear velocities and angular velocities by using stereo vision sensor and 2G1Y sensor (longitudinal acceleration, lateral acceleration, and yaw rate). The estimated ego-motion information can be utilized to predict future ego-path and improve the accuracy of 3D coordinate of obstacle by compensating for disturbance from vehicle movement representatively for collision avoidance system. For the purpose of incorporating vehicle dynamic characteristics into ego-motion estimation, the state evolution model of Kalman filter has been augmented with lateral vehicle dynamics and the vanishing point estimation has been also taken into account because the optical flow radiates from a vanishing point which might be varied due to vehicle pitch motion. Experimental results based on real-world data have shown the effectiveness of the proposed methodology in view of accuracy.
Development of a DMC Block for Use with an RCP System and its Application
Lee, Young-Sam ; Yu, Kwang-Myung ;
Journal of Institute of Control, Robotics and Systems, volume 21, issue 9, 2015, Pages 827~835
DOI : 10.5302/J.ICROS.2015.15.0086
In this paper, we present the implementation method of Dynamic Matrix Control(DMC) block for use with a Rapid Control Prototyping(RCP) system and consider the speed control of a DC motor using the developed DMC block. Firstly, we briefly introduce a lab-built RCP system. Secondly, we present a method for implementing a DMC block using C-language, which enables the DMC algorithm to be represented in a library block that can be used in a Simulink environment. Finally, we use the developed DMC block for the speed control of a DC motor, through which we show that the DMC-based control system can be easily implemented and applied to the real-time control of systems with relatively fast dynamics.
A Study on the TMBE Algorithm with the Target Size Information
Jung, Yun Sik ; Kim, Jin Hwan ;
Journal of Institute of Control, Robotics and Systems, volume 21, issue 9, 2015, Pages 836~842
DOI : 10.5302/J.ICROS.2015.15.0062
In this paper, the target size and model based target size estimator (TMBE) algorithm is presented for iimaging infrared (IIR) seeker. At the imaging seeker, target size information is important factor for accurate tracking. The model based target size estimator filter (MBEF) algorithm was proposed to estimate target size at imaging infrared seeker. But, the model based target size estimator filter algorithm need to know relative distance from the target. In order to overcome the problem, we propose target size and model based target size estimator filter (TMBEF) algorithm which based on the target size. The performance of proposed algorithm is tested at target intercept scenario. The experiment results show that the proposed algorithm has the accurate target size estimating performance.
A Study on the Static Target Accurate Size Estimation Algorithm with ARR-TSE
Jung, Yun Sik ; Kim, Jin Hwan ; Kim, Jang Eun ;
Journal of Institute of Control, Robotics and Systems, volume 21, issue 9, 2015, Pages 843~848
DOI : 10.5302/J.ICROS.2015.15.0063
In this paper, The ARR-TSE (Automatic Range Restore - Triangulation based target Size Estimator) algorithm is presented for IIR (Imaging Infrared) seeker. The target size is important information for the IIR target tracking. The TSE (Triangulation based target Size Estimator) algorithm has suitable performance to estimate target size for static IIR target. but, the performance of the algorithm can be decreased by noise. In order to decrease influence of noise, we propose the ARR-TSE algorithm. The performance of proposed method is tested at target intercept scenario. The simulation results show that the proposed algorithm has the accurate target size estimating performance.
Evaluation Study of a Human-sized Bipedal Humanoid Robot Through a Public Demonstration in a Science Museum
Ahn, Tae-Beom ; Kang, E-Sok ;
Journal of Institute of Control, Robotics and Systems, volume 21, issue 9, 2015, Pages 849~857
DOI : 10.5302/J.ICROS.2015.15.0109
Although human-sized bipedal humanoid robots have been developed as the ideal form of human-friendly robots, studies of humanoid robots from the user perspective and of actual interaction between humanoid robots and the public in daily environments are few. This paper presents a long-term public demonstration that encouraged interaction between a humanoid robot and unspecified individuals. We have collected a significant amount of subjective evaluation data from the public by performing a storytelling demonstration that enhanced people's empathy towards the robot. The evaluation model consists of the robot's human friendliness, which involves its impression on humans, interaction with humans, and imitation of human motions and the robot's human appearance which involves gender, age, height, and body type. This study shows that there is no significant difference in human-friendliness between gender groups (male and female), while there is a significant difference between age groups (children and adults). In human appearance, it appears that there is no significant difference between either gender groups or age groups, except for the case of the robot's height.
Obstacle Detection Algorithm Using Forward-Viewing Mono Camera
Lee, Tae-Jae ; Lee, Hoon ; Cho, Dong-Il Dan ;
Journal of Institute of Control, Robotics and Systems, volume 21, issue 9, 2015, Pages 858~862
DOI : 10.5302/J.ICROS.2015.15.0104
This paper presents a new forward-viewing mono-camera based obstacle detection algorithm for mobile robots. The proposed method extracts the coarse location of an obstacle in an image using inverse perspective mapping technique from sequential images. In the next step, graph-cut based image labeling is conducted for estimating the exact obstacle boundary. The graph-cut based labeling algorithm labels the image pixels as either obstacle or floor as the final outcome. Experiments are performed to verify the obstacle detection performance of the developed algorithm in several examples, including a book, box, towel, and flower pot. The low illumination condition, low color contrast between floor and obstacle, and floor pattern cases are also tested.
Vibration Control of a Single-wheel Robot Using a Filter Design
Lee, Sang-Deok ; Jung, Seul ;
Journal of Institute of Control, Robotics and Systems, volume 21, issue 9, 2015, Pages 863~868
DOI : 10.5302/J.ICROS.2015.15.0103
In this paper, the vibration of a single-wheel mobile robot is minimized by designing a filter. An AHRS (Attitude and heading reference system) sensor is used for measuring the state of the robot. The measured signals are analyzed using the FFT method to investigate the fundamental vibrational frequency with respect to the flywheel's speed of the gimbal system. The IIR notch filter is then designed to suppress the vibration at the identified frequency. After simulating the performance of the designated filter using the measured sensor data through extensive experiments, the filter is actually implemented in a single-wheel mobile robot, GYROBO. Finally, the performance of the designed filter is confirmed by performing the balancing control task of the GYROBO system.
Study on LSDC Design for Coiling Shape Control of Hot Strip Mills
Lee, Sang Ho ; Park, Hong Bae ; Park, Cheol Jae ;
Journal of Institute of Control, Robotics and Systems, volume 21, issue 9, 2015, Pages 869~874
DOI : 10.5302/J.ICROS.2015.15.0113
We developed an LSDC (Load Shift and Load Distribution Control) technology in order to improve coil quality and productivity by reducing tension fluctuation especially for the tail of the strip in the down coiler in hot strip mills. To adapt the new controller, the torque and speed distribution between the zero pinch roll, pinch roll, and mandrel are needed. The proposed controller is a combination of an LSC to share the tension between the mill stand and the mandrel, and an LDC to shift the torque load from the zero pinch roll to the pinch roll. From the simulation, the proposed controller is verified under the torque disturbance. Using a field test, the torque deviation decreased by nearly 50% through utilization of the LSDC control.
APC Technique and Fault Detection and Classification System in Semiconductor Manufacturing Process
Ha, Dae-Geun ; Koo, Jun-Mo ; Park, Dam-Dae ; Han, Chong-Hun ;
Journal of Institute of Control, Robotics and Systems, volume 21, issue 9, 2015, Pages 875~880
DOI : 10.5302/J.ICROS.2015.15.0095
Traditional semiconductor process control has been performed through statistical process control techniques in a constant process-recipe conditions. However, the complexity of the interior of the etching apparatus plasma physics, quantitative modeling of process conditions due to the many difficult features constraints apply simple SISO control scheme. The introduction of the Advanced Process Control (APC) as a way to overcome the limits has been using the APC process control methodology run-to-run, wafer-to-wafer, or the yield of the semiconductor manufacturing process to the real-time process control, performance, it is possible to improve production. In addition, it is possible to establish a hierarchical structure of the process control made by the process control unit and associated algorithms and etching apparatus, the process unit, the overall process. In this study, the research focused on the methodology and monitoring improvements in performance needed to consider the process management of future developments in the semiconductor manufacturing process in accordance with the age of the APC analysis in real applications of the semiconductor manufacturing process and process fault diagnosis and control techniques in progress.
Improved Wheelset Speed Implementation of a Brake HILS System for a Railway Vehicle
Lee, Dong-chan ; Kang, Chul-Goo ;
Journal of Institute of Control, Robotics and Systems, volume 21, issue 9, 2015, Pages 881~887
DOI : 10.5302/J.ICROS.2015.15.0045
The hardware-in-the-loop simulation (HILS) of a railway vehicle is crucial for overcoming the limitation of field tests of a railway vehicle. A brake HILS system for a railway vehicle was previously not able to test the performance of a speed-sensing system of a railway vehicle, since wheelset speeds were generated only by computer simulations. In this paper, we present a novel wheelset speed implementation of a brake HILS system for a railway vehicle. Four wheelset speeds of a brake HILS system for a car of a railway vehicle are implemented using four small-sized servomotors, whereas the speed sensors and pole wheels used in the brake HILS system are the actual ones of the railway vehicle. According to the simulated speeds of four wheelsets in the dynamic equations of motion, four servomotors generate wheel speeds in real time, and then the measured wheelset speeds are fed back to the computer simulation model. Moreover, in this paper, we improve the performance of wheelset speed measurement via the T method instead of the M method presently used in the field. The performances of wheelset speed implementation and speed-sensor operation are demonstrated by experimental works using a HILS system.
Development of Low Altitude Terrain Following System based on TERain PROfile Matching
Kim, Chong-sup ; Cho, In-je ; Lee, Dong-Kyu ; Kang, Im-Ju ;
Journal of Institute of Control, Robotics and Systems, volume 21, issue 9, 2015, Pages 888~897
DOI : 10.5302/J.ICROS.2015.14.0118
A flight capability to take a terrain following flight near the ground is required to reduce the probability that a fighter aircraft can be detected by foe's radar fence in the battlefield. The success rate for mission flight has increased by adopting TFS (Terrain Following System) to enable the modern advanced fighter to fly safely near the ground at the low altitude. This system has applied to the state-of-the-art fighter and bomber, such as B-1, F-111, F-16 E/F and F-15, since the research begins from 1960's. In this paper, the terrain following system and GCAS (Ground Collision Avoidance System) was developed, based on a digital database with UTAS's TERPRROM (TERrain PROfile Matching) equipment. This system calculates the relative location of the aircraft in the terrain database by using the aircraft status information provided by the radar altimeter and the INS (Inertial Navigation System), based on the digital terrain database loaded previously in the DTC (Data Transfer Cartridge), and figures out terrain features around. And, the system is a manual terrain following system which makes a steering command cue refer to flight path marker, on the HUD (Head Up Display), for vertical acceleration essential for terrain following flight and enables a pilot to follow it. The cue is based on the recognized terrain features and TCH (Target Clearance Height) set by a pilot in advance. The developed terrain following system was verified in the real-time pilot evaluation in FA-50 HQS (Handling Quality Simulator) environment.
Analysis of Error Propagation in Two-way-ranging-based Cooperative Positioning System
Lim, Jeong-Min ; Lee, Chang-Eun ; Sung, Tae-Kyung ;
Journal of Institute of Control, Robotics and Systems, volume 21, issue 9, 2015, Pages 898~902
DOI : 10.5302/J.ICROS.2015.15.0039
Alternative radio-navigation technologies aim at providing continuous navigation solution even if one cannot use GNSS (Global Navigation Satellite System). In shadowing region such as indoor environment, GNSS signal is no longer available and the alternative navigation system should be used together with GNSS to provide seamless positioning. For soldiers in battlefield where GNSS signal is jammed or in street battle, the alternative navigation system should work without positioning infrastructure. Moreover, the radio-navigation system should have scalability as well as high accuracy performance. This paper presents a TWR (Two-Way-Ranging)-based cooperative positioning system (CPS) that does not require location infrastructure. It is assumed that some members of CPS can obtain GNSS-based position and they are called mobile anchors. Other members unable to receive GNSS signal compute their position using TWR measurements with mobile anchors and neighboring members. Error propagation in CPS is analytically studied in this paper. Error budget for TWR measurements is modeled first. Next, location error propagation in CPS is derived in terms of range errors. To represent the location error propagation in the CPS, Location Error Propagation Indicator (LEPI) is proposed in this paper. Simulation results show that location error of tags in CPS is mainly influenced by the number of hops from anchors to the tag to be positioned as well as the network geometry of CPS.