International Journal of Applied Electromagnetics and Mechanics - Volume 24, issue 3-4

Authors: Kawafuku, Motohiro | Igarashi, Hitoshi | Iwasaki, Makoto | Hirai, Hiromu

Article Type: Research Article

Abstract: The present paper proposes a novel fast and precise positioning strategy using an iterative learning control. The authors have previously proposed an effective positioning algorithm by applying the command shaping technique using an FFT-based inverse model of a closed loop system. On the other hand, the modeling error and/or variation of the plant system causes deterioration of the positioning performance due to the lack of robustness of the controller with respect to these errors. In the …present research, in order to ensure the above-mentioned robustness, an iterative learning control technique in the frequency domain is introduced, in which the position command is successively shaped to satisfy the positioning specifications. The effectiveness of the proposed control strategy has been verified experimentally using prototype machine tools. Show more

DOI: 10.3233/JAE-2006-810

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 24, no. 3-4, pp. 261-271, 2006

Authors: Sung, Ji Won | Lee, Chel Woong | Kim, Gyu-Sik | Lipo, T.A. | Won, Chung-Yuen | Choi, Sewan

Article Type: Research Article

Abstract: A closed-loop sensorless stroke control system for a linear compressor has been designed. The motor parameters are identified as a function of the piston position and the motor current. They are stored in ROM table and used later for the accurate estimation of piston position. Also it was attempted to approximate the identified motor parameters to the 2nd-order surface functions. Some experimental results are given in order to show the feasibility of the proposed control schemes …for linear compressors. Show more

Keywords: Sensorless stroke control, linear compressor, identified motor parameters

DOI: 10.3233/JAE-2006-811

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 24, no. 3-4, pp. 273-286, 2006

Authors: Yamada, K. | Yamaguchi, K. | Shinagawa, A. | Liu, B. | Honda, Z. | Isobe, Y. | Takagi, T.

Article Type: Research Article

Abstract: Aiming at nondestructive evaluation of magnetic materials, Monte Carlo simulations of the dynamic magnetic processes were investigated on the temporal and the temperature dependences for spin systems with various lattice imperfections as so called Barkhausen noises. From a physical point of view, the presented method might be the more useful tool for the analyses of the dynamic magnetic processes rather than those by Preisach model.

Keywords: Monte-Carlo simulations, M-H curve, defects, Barkhausen noises, NDE

DOI: 10.3233/JAE-2006-812

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 24, no. 3-4, pp. 287-295, 2006

Authors: Miyoshi, Takanori | Terashima, Kazuhiko

Article Type: Research Article

Abstract: In this paper, a power assisted system for an overhead crane is presented. This system is realized by measuring the swing angle of a crane and moving the trolley and girder in the desired direction. Therefore, operators can move a heavy object freely using only slight force. In this paper, two kinds of controllers are proposed. One is a PD controller that emulates the dynamics of object with damping and it moves the object in proportional …velocity to the operating force in steady-state. Another is a PID controller that maintains the velocity of object continuously after operators cease the application of their force. Its dynamics, damping characteristics, steady-state and admissible condition of controller gain are discussed in regard to the respective controllers. This system is applied to an experimental overhead crane in the laboratory, and the effect of energy saved by the power assist is shown by measuring the heart rate of operator. Show more

DOI: 10.3233/JAE-2006-813

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 24, no. 3-4, pp. 297-309, 2006

Authors: Park, No-Hoon | Oh, Yonghwan | Oh, Sang-Rok

Article Type: Research Article

Abstract: In this paper, we studied a behavior-based architecture to understand environment and perform manipulation through tactile servoing, especially by Chained Releaser Subsumption Architecture. This CRSA has the releasers which connect upper level with lower level. In order to verify the effectiveness of the CRSA, a 4 degree-of-freedom hand was designed and several behavioral grasping simulations and experiments are performed. In the simulations, the graphical behavioral performance was obtained as well as the …trajectories of each of the fingers. In the experiments, some of the behaviors were initiated at level 1 to level 2. While the robotic hand performed grasping behaviors, the control program took the data from the DC motors and FSR sensors to make plan for future behaviors. The experiment results show that it is possible to control a robotic hand by behavior-based tactile servoing strategies. Show more

Keywords: Behavior-based control, 4 degree-of-freedom robotic hand, chained releaser subsumption architecture

DOI: 10.3233/JAE-2006-814

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 24, no. 3-4, pp. 311-321, 2006