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A mobile robot estimating the real-time moving sound sources by using the curvature trajectory

Journal of Institute of Control, robotics and Systems 2014年第1期20卷 48-57页

作者： Han, Jong-Ho Park, Sook-hee Lee, Dong-Hyuk Noh, Kyung-wook Lee, Jang-myung Department of Electrical Engineering Pusan National University Korea Republic of Department of Interdisciplinary Program in Robotics Pusan National University Korea Republic of

It is suggested that the curvature trajectory be used to estimate the real-time moving sound sources and efficiently the robot estimating the sound sources. Since the target points of the real-time moving sound sources change, the mobile robot continuously estimates the changed target points. In such a case, the robot experiences a slip phenomenon due to the abnormal velocity and the changes of the navigating state. By selecting an appropriate curvature and navigating the robot gradually by using it, it is possible to enable the robot to reach the target points without having much trouble. In order to recognize the sound sources in real time, three microphones need to be organized in a straight form. Also, by applying the cross-correlation algorithm to the TDOA base, the signals can be analyzed. By using the analyzed data, the locations of the sound sources can be recognized. Based on such findings, the sound sources can be estimated. Even if the mobile robot is navigated by selecting the gradual curvature based on the changed target points, there could be errors caused by the inertia and the centrifugal force related to the velocity. As a result, it is possible to control the velocity of both wheels of the robot through the velocity PID controller in order to compensate for the slip phenomenon and minimize the estimated errors. In order to examine whether the suggested curvature trajectory is appropriate for estimating the sound sources, two mobile robots are arranged to carry out an actual experiment. The first robot is moved by discharging the sound sources, while the second robot recognizes and estimates the locations of the discharged sound sources in real time. © ICROS 2014.

关键词： Mobile robots

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Predictive control of an efficient human following robot using Kinect sensor

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Journal of Institute of Control, robotics and Systems 2014年第9期20卷 957-963页

作者： Heo, Shin-Nyeong Lee, Jang-Myung Department of Interdisciplinary Program in Robotics Pusan National University Korea Republic of Department of Electrical Engineering Pusan National University Korea Republic of

This paper proposes a predictive control for an efficient human following robot using Kinect sensor. Especially, this research is focused on detecting of foot-end-point and foot-vector instead of human body which can be occluded easily by the obstacles. Recognition of the foot-end-point by the Kinect sensor is reliable since the two feet images can be utilized, which increases the detection possibility of the human motion. Depth image features and a decision tree have been utilized to estimate the foot endpoint precisely. A tracking point average algorithm is also adopted in this research to estimate the location of foot accurately. Using the continuous locations of foot, the human motion trajectory is estimated to guide the mobile robot along a smooth path to the human. It is verified through the experiments that detecting foot-end-point is more reliable and efficient than detecting the human body. Finally, the tracking performance of the mobile robot is demonstrated with a human motion along an 'L' shape course. © ICROS 2014.

关键词： Mobile robots

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Estimate the inclination angle using traveling speed of Segway robot on the slope

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Journal of Institute of Control, robotics and Systems 2014年第11期20卷 1164-1169页

作者： Jeong, Hee-In Lee, Sang-Yong Lee, Jang-Myung Department of Electrical Engineering Pusan National University Korea Republic of Department of Interdisciplinary Program in Robotics Pusan National University Korea Republic of

This paper proposes an angle estimation of Segway robot for the slop driving. Most of Segway robot was controlled by pose control of keeping robot's balance and motor control of driving. In motor control, we analyzed Segway robot kinetically and estimated an angle of inclination using the velocity that depends on input force. In pose control, also, we used PD controller and evaluated a stability of controller through MATLAB simulation. Assuming the robot keeps its balance stably using controller, we could linearize dynamics. We could obtain the result through the experiment which estimates an angle using the velocity of Segway robot that is derived from linearized dynamics. © ICROS 2014.

关键词： Robots

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LQR controller design for balancing and driving control of a bicycle robot

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Journal of Institute of Control, robotics and Systems 2014年第5期20卷 551-556页

作者： Kang, Seok-Won Park, Kyung-Il Lee, Jangmyung Department of Interdisciplinary Program in Robotics Pusan National University Korea Republic of School of Electronic Engineering Pusan National University Korea Republic of

This paper proposes a balancing control and driving control of a bicycle robot based on dynamic modeling of the bicycle robot, which has been derived using the Lagrange equations. For the balancing control of the bicycle robot, a reaction wheel pendulum method has been adopted in this research. By using the dynamics equations of the bicycle robot, an LQR controller has been designed for a balancing and driving control of a bicycle robot. The performance of the balance control is verified experimentally before the driving control, which shows a stable posture within one degree vibrations. To show the dynamic characteristics of the bicycle robot during driving, a trapezoidal velocity trajectory is selected as the references. Through simulations and real experiments, the effectiveness of the proposed algorithm has been demonstrated. © ICROS 2014.

关键词： Equations of motion

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Tactile navigation system using a haptic device

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Journal of Institute of Control, robotics and Systems 2014年第8期20卷 807-814页

作者： Lee, Dong-Hyuk Noh, Kyung-Wook Kang, Sun Kyun Kim, Hyun Woo Lee, Jang-Myung Department of Electrical Engineering Pusan National University Korea Republic of Department of Interdisciplinary Program in Robotics Pusan National University Korea Republic of

In this paper, we proposed a haptic navigation system which used the tactile data for the user guides of the mobile robot to the reference point via tele-operation in unknown blind environment. This navigation system can enable a mobile robot to avoid obstacles and move to the reference point, according to the direction provided by the device guides through a haptic device consisting of a vibration motor in a blind environment. There are a great deal of obstacles in real environments, and so mobile robots can avoid obstacles by recognizing the exact position of each obstacle through the superposition of an ultrasonic sensor. The navigation system determines the direction of obstacle avoidance through an avoidance algorithm that uses virtual impedance, and lets users know the position of obstacles and the direction of the avoidance through the haptic device consisting of 5 vibration motors. By letting users know intuitionally, it lets the mobile robot precisely reach the reference point in unknown blind environment. This haptic device can implement a haptic navigation system through the tactile sensor data. © ICROS 2014.

关键词： Mobile robots

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Obstacle information transfer and control method using haptic device consist of vibration motors

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Journal of Institute of Control, robotics and Systems 2014年第10期20卷 1036-1043页

作者： Lee, Dong-Hyuk Noh, Kyung-Wook Kang, Sun Kyun Han, Jong Ho Lee, Jang-Myung Department of Electrical Engineering Pusan National University Korea Republic of Department of Interdisciplinary Program in Robotics Pusan National University Korea Republic of

In this paper, a new haptic device is proposed for the teleoperation, which can recognize the invisible environment of a mobile robot. With this new device, it is possible for the user to identify the location of an obstacle and to avoid it. The haptic device has been attached on the top of a joystick so that the user can remotely control the mobile robot to avoid the obstacles which are recognized by the ultrasonic sensors. Also, the invisible environment is recognized more accurately overlapping the data from the ultrasonic sensors. There are five vibration motors in the haptic device to indicate the direction of the obstacle. So the direction of the obstacle can be recognized by the vibration at the finger on each vibration motor. For various situations and surrounding environments, experiments are performed using fuzzy controller and overlapping ultrasonic sensors. The results demonstrate the effectiveness of the proposed haptic joystick.

关键词： Remote control

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Outdoor localization for a quad-rotor using extended Kalman filter and path planning

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Journal of Institute of Control, robotics and Systems 2014年第11期20卷 1175-1180页

作者： Kim, Ki-Jung Lee, Dong-ju Kim, Yoon-Ki Lee, Jang-Myung Department Interdisciplinary Program in Robotics Pusan National University Korea Republic of Depart of Electrical Engineering Pusan National University Korea Republic of

This paper proposes a new technique that produces improved local information using a low-cost GPS/INS system combined with Extended Kalman Filter and Path Planning when a Quad-rotor flies. In the research, a low-cost GPS is combined with INS by Extended Kalman Filter to improve local information. However, this system has disadvantages in that estimation accuracy is getting worsens when the Quad-rotor flies through the air in a curve and precision of location information is influenced by performance of the used GPS. An algorithm based on Path Planning is adopted to deal with these weaknesses. When the Quad-rotor flies outdoors, a short moving path can be predicted because all short moving paths of quad-rotor can be assumed to be straight. Path planning is used to make the short moving path and determine the closest local information of data of the GPS/INS system to location determined by path planning. Through the foregoing process, improved local data is obtained when the quad-rotor flies, and the performance of the proposed system is verified from various outdoor experiments. © ICROS 2014.

关键词： Extended Kalman filters

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Objects tracking of the mobile robot using the hybrid visual servoing

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Journal of Institute of Control, robotics and Systems 2015年第8期21卷 781-787页

作者： Park, Kang-I.L. Woo, Chang-Jun Lee, Jangmyung Department of Interdisciplinary Program in Robotics Pusan National University Korea Republic of Department of Electronic and Electric and Computer Engineering Pusan National University Korea Republic of Department of Electronic Engineering Pusan National University Korea Republic of

This paper proposes a hybrid visual servoing algorithm for the object tracking by a mobile robot with the stereo camera. The mobile robot with the stereo camera performs an object recognition and object tracking using the SIFT and CAMSHIFT algorithms for the hybrid visual servoing. The CAMSHIFT algorithm using stereo camera images has been used to obtain the three-dimensional position and orientation of the mobile robot. With the hybrid visual servoing, a stable balance control has been realized by a control system which calculates a desired angle of the center of gravity whose location depends on variations of link rotation angles of the manipulator. A PID controller algorithm has adopted in this research for the control of the manipulator since the algorithm is simple to design and it does not require unnecessary complex dynamics. To demonstrate the control performance of the hybrid visual servoing, real experiments are performed using the mobile manipulator system developed for this research. © ICROS 2015.

关键词： Mobile robots

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Development of medical ruby laser power supply using LLC resonant converter

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Transactions of the Korean Institute of Electrical Engineers 2014年第7期63卷 924-928页

作者： Kim, Dong-Hyun Jung, Jae-Hun Kim, Hee-Je Dept. of Electrical Engineering Pusan National University Korea Republic of Dept. of Interdisciplinary Program in Robotics Pusan National University Korea Republic of

LLC resonant converter is used to control laser power density in ruby laser power supply. Zero voltage switching(ZVS) is implemented to minimize the switching loss by the LLC resonant converter. Laser output power is investigated and experimented by changing the output current. That current is controled by the charging voltage of capacitor. From those results, we obtained the maximum laser output of 1.94J at the discharge current of 860A and the pulse repetition rate of 1Hz.

关键词： Power converters

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Reaction force estimation of hydraulic servo system using sliding perturbation observer

Reaction force estimation of hydraulic servo system using sl...

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

作者： Keum-Gang Cha Sung-Min Yoon Hyun-Hee Kim Ki-Yeon Gim Min-Cheol Lee Department of Mechanical Engineering Pusan National University Busan Republic of Korea Interdisciplinary Program in Robotics Pusan National University Busan Republic of Korea School of Mechanical Engineering Pusan National University Busan Republic of Korea

ISBN: (纸本)9781467391085

In this paper, the estimation method of reaction force for electro-hydraulic servo system for movement is discussed. This reaction force estimation method is based on sliding perturbation observer that is robust observer technique. Before estimating reaction force, the modeling of electro-hydraulic servo system is processed. Before the fine modeling parameters of electro-hydraulic servo system, modeling equation is obtained through cylinder equation using expansion and shrinkage stroke process. After finding modeling equation, the obtaining accurate modeling parameter is carried out from signal compression method. After defining modeling parameter, reaction force estimation is operated by sliding perturbation observer. The analysis result of estimation for reaction force will be used for bilateral control with master-slave structure.

关键词： Force Mathematical model Observers Damping Dynamics Uncertainty Valves

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