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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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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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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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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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3D map building for slopes based on modeling of mobile robot

3D map building for slopes based on modeling of mobile robot

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IEEE International Conference on Industrial Technology (ICIT)

作者： Yo-Seop Hwang Hyun-Woo Kim Dong-Ju Lee Jang-Myung Lee Department of Electrical Engineering Pusan National University Busan Korea Department of Interdisciplinary Program in Robotics Pusan National University Busan Korea

This paper proposes a robust 3D (dimension) map building system for a mobile robot using a LRF (Laser Range Finder). Instead of the expensive and bulky 3D laser scanner, the LRF can be utilized and installed on the mobile robot for the map building and the autonomous navigation. This research, the scanning operations are performed while the mobile robot moved on the slanted surface and ground without stops. The motion of the mobile robot is transformed into the scanning surface in the process of forming the 3D map. The experimental results reveal that the improved accuracy of navigation for the mobile robot in the real time scanning of the environment.

关键词： Mobile robots Three-dimensional displays Buildings Sensors Robot kinematics Navigation

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Vibration pattern for the implementation of haptic joystick

Vibration pattern for the implementation of haptic joystick

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6th International Conference on Intelligent robotics and Applications, ICIRA 2013

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

ISBN: (纸本)9783642408519

In this paper, the obstacle recognition research is conducted by using vibration pattern. Remotely, the user can perceive the surroundings sensed by the obstacle recognition unit. The vibration motor was installed at the bottom of the joystick in order to let the user perceive the distance value of the obstacle which can be recognized by ultrasonic sensors. And in the various situations, the operation can be precisely implemented by using the Fuzzy controller. © 2013 Springer-Verlag Berlin Heidelberg.

关键词： Ultrasonic sensors

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Object following robot using vision camera, single curvature trajectory and Kalman filters

Object following robot using vision camera, single curvature...

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6th International Conference on Intelligent robotics and Applications, ICIRA 2013

作者： Heo, Shin-Nyeong Lim, Hyun-Seop Hwang, Seungik Lee, Jangmyung Interdisciplinary Program in Robotics Pusan National University Korea Republic of Department of Electrical Engineering Pusan National University Korea Republic of

ISBN: (纸本)9783642408519

Path planning of mobile robot has a purpose to design an optimal path from an initial position to a target point. Minimum driving time, minimum driving distance and minimum driving error might be considered in choosing the optimal path and they are correlated to each other. In this paper, an efficient driving trajectory is planned in a real situation where a mobile robot follows a moving object. Position and distance of the moving object are obtained using a web camera;the rotation angular and linear velocities are estimated using Kalman filters to predict the trajectory of the moving object. Finally the mobile robot follows the moving object using a single curvature trajectory by estimating trajectory of the moving object. Using the estimation by Kalman filters and the single curvature in the trajectory planning, the total tracking distance and error rate have been saved about 7 %. © 2013 Springer-Verlag Berlin Heidelberg.

关键词： Kalman filters

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Vision based people tracking using stereo camera and camshift

Vision based people tracking using stereo camera and camshif...

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6th International Conference on Intelligent robotics and Applications, ICIRA 2013

作者： Park, Kang-Il Park, Chan-Ik Lee, Jangmyung Interdisciplinary Program in Robotics Pusan National University Korea Republic of Department of Electrical Engineering Pusan National University Korea Republic of

ISBN: (纸本)9783642408519

In this paper proposes a visual manipulation method that incorporates computation of 3D object position from characteristic disparity of stereo image. First, we proceed to an image revision work using the calibration. To obtain the characteristic disparity, a set of characteristic points, essential to obtain characteristics like center points or corner points are determined from the CAMShift center of left and right images. By iterative computation and tracking in real time, the algorithm is able to robustly provide accurate 3D position of target objects. © 2013 Springer-Verlag Berlin Heidelberg.

关键词： Calibration

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Outdoor precision position estimation system using multi-GPS receivers

Outdoor precision position estimation system using multi-GPS...

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6th International Conference on Intelligent robotics and Applications, ICIRA 2013

作者： Choi, Seunghwan Kim, Kijung Kim, Yunki Lee, Jangmyung Interdisciplinary Program in Robotics Pusan National University Korea Republic of Department of Electrical Engineering Pusan National University Korea Republic of

ISBN: (纸本)9783642408519

In this paper, tightly coupled system is designed using multi-GPS receivers based on the Extended Kalman Filter(EKF). Typically, GPS has the instantaneous error and INS has the disadvantage that the cumulative error occurs over time. To fill the gap, receiving is stabilized and accuracy is higher position information get using multi-GPS receivers. INS's data is precisely updated through the multi-GPS's position data in the data fusion process of the EKF. Through experiment, it can verify the results compared single GPS and multi-GPS position error, and then calibrated mobile robot position estimation results can be found. © 2013 Springer-Verlag Berlin Heidelberg.

关键词： Global positioning system

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