IEEJ Transactions on Industry Applications
Online ISSN : 1348-8163
Print ISSN : 0913-6339
ISSN-L : 0913-6339
Volume 120 , Issue 5
Showing 1-17 articles out of 17 articles from the selected issue
  • Shinji Ozawa
    2000 Volume 120 Issue 5 Pages 619-624
    Published: May 01, 2000
    Released: December 19, 2008
    JOURNALS FREE ACCESS
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  • Tatsuro Mitsui, Iwao Okutani
    2000 Volume 120 Issue 5 Pages 625-633
    Published: May 01, 2000
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    The traffic flow data used for optimizing signal parameters is inherently inaccurate because it is usually determined by prediction. In order to examine the sensitivity of control performance to the prediction errors, the total delays for signal control strategies based on erroneous flow data are calculated when they are applied to the actual flow. A discrete-time model is developed to describe the dynamic behavior of oversaturated urban road networks. This model enables to optimize a series of splits for each signal that minimize the total network delay during congested periods. Several numerical examples for a two-way street consisted of five intersections are given and the results are discussed. The control strategy using predicted flow data in optimization produces 10% to 23% more delay than the true optimum control. The total delay is found to be sensitive to errors in traffic demand or proportion of traffic movements, while not to be sensitive to errors in saturation flow. The results obtained in this paper should be useful to estimate the range of conditions for which particular signal settings are likely to be suitable.
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  • Shin Kato, Sadayuki Tsugawa
    2000 Volume 120 Issue 5 Pages 634-641
    Published: May 01, 2000
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    This paper describes an algorithm for lateral control of an automated vehicle with a vision system for autonomous navigation and an extention for lane change maneuvers. The lateral control consists of steps of reference line detection, path generation, and lateral control calculation. A coefficient of a cubic curve that approximates a series of sampled points on the reference line provides the lateral control. A path for various maneuvers including lane changing is generated by shifting the series of sampled points. Simulation studies and outdoor experiments on lane changing have been conducted to show the feasibility of the algorithm.
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  • Hiroyasu Taniguchi, Takahiro Nakamura, Haruki Furusawa, Shinji Ozawa
    2000 Volume 120 Issue 5 Pages 642-650
    Published: May 01, 2000
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    Traffic flow measurement sensors, which measure vehicle velocity and detect traffic accidents, traffic congestion and so on using image processing, have been installed. Image processing methods are based on recognizing each vehicle. However, in the case where cameras are set up at low positions such as in tunnels, it is difficult to measure vehicle velocity in heavy traffic conditions because one vehicle often blocks the view of another in the images. To overcome this drawback, we propose a method for measurement of velocity for a group of vehicles. The method utilizes DTT method which transforms spatio-temporal image to 2-D data onto a directional-temporal plane, and measures moving time of a group of vehicles by matching patterns of DTT data at some points. We describe the method and also show the experimental results using road images.
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  • Takashi Izumi, Yutaka Takahashi, Norio Kiryu
    2000 Volume 120 Issue 5 Pages 651-657
    Published: May 01, 2000
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    This paper describes a new method of the travel time measurement based on the vehicle height data from the ultrasonic vehicle-identification equipment which has been developed using the pulse-type ultrasonic vehicle detector. The travel time is obtained by the difference of each passage time when the pattern matching of the vehicle data at upstream and downstream points is executed. However, there are following two problems which do the pattern matching using vehicle height data difficult. (1) The vehicle height data fluctuates by road surface condition and driving situation etc. (2) There are many resembled shape vehicles in a set of measurement object. Then, we analyze the vehicle height data, and construct the algorithm considering the possibility distribution on parameters for the vehicle pattern matching. Finally, we show the effectiveness of the proposed method by experiment of the travel time measurement.
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  • Satoshi Ogasawara, Song Zhang, Hirofumi Akagi
    2000 Volume 120 Issue 5 Pages 658-665
    Published: May 01, 2000
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    This paper deals with active circuits for cancellation and compensation of common-mode voltage caused by a PWM inverter. A non-negligible amount of leakage or ground current would flow through stary capacitors between stator windings and a motor frame due to a large step change in the common-mode voltage at every switching operation of the PWM inverter. First, it is shown experimentally that the active common-noise canceler (ACC), which has been proposed by the authors, is effective in reducing not only conducted EMI but also motor shaft voltage and bearing current. Next, a new ACC characterized by an isolated power supply is developed to enlarge an applicable voltage range in which it is possible to integrate the ACC with a PWM inverter. Furthermore, the authors proposes another type of ACC, the purpose of which is, not to achieve complete cancellation, but to restrain only a slope in a change of the common-mode voltage applied to the the motor. As a result, the core size of the common mode transformer used in the active compensating circuit becomes smaller considerably. Some experimental results show good effects of the proposed active circuits on both ground current and conducted EMI.
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  • Koichi Hirano, Hidehiro Hara, Teruo Tsuji, Ryuichi Oguro
    2000 Volume 120 Issue 5 Pages 666-672
    Published: May 01, 2000
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    This paper shows techniques to drive a IPM (Interior Parmanent Magnet) motor in all region of speed. That is, a sensorless vector control with a disturbance observer is shown for a normal speed region, a detection method of a pole position is shown at stand still, and for a extremly low speed, a method which produce a required torque is shown.
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  • Ray Nakashima, Masao Ojima, Ryuichi Oguro, Teruo Tsuji
    2000 Volume 120 Issue 5 Pages 673-679
    Published: May 01, 2000
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    This paper describes a decoupling control method for industrial robots. Recently, industrial robots require high quality of control and fast response, therefore, interference between arms that has been usually neglected before, must be taken into consideration. In the robot with multi-joint control, an arm is generally modeled as a rigid system, however, this model is to be considered a 2-mass system. This paper proposes decoupling control method where an arm is modeled as the 2-mass system. The validity of the proposed method is confirmed by the simulation and the experiment in the 2-link robot.
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  • Kitti Tirasesth, Jongkol Ngamwiwit, Thanit Trisuwannawat, Noriyuki Kom ...
    2000 Volume 120 Issue 5 Pages 680-686
    Published: May 01, 2000
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    This paper presents a design technique for the two-degree of freedom control system using PID×(n-2)/2 stage PDA as a cascade robust controller for a class of nth order plants. It is intended to satisfy both transient and steady state response specifications based on root locus approach. This controller can be used instead of a conventional PID controller for the higher order plant to obtain better performances. By this design technique, the controlled system is approximated as a second order system, and the desired performances are satisfied. For the plant with stable poles including the case with small dead time, the closed-loop poles are located on the left half of the s-plane and the controlled system become robustly stable. The cascade robust controller gain is adjusted to meet faster responses with a small or no overshoot. Robustness properties given by the controllers proposed in this paper have also been demonstrated by illustrative examples.
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  • Kazuo Shima, Kazumasa Ide, Miyoshi Takahashi, Kiyoshi Oka
    2000 Volume 120 Issue 5 Pages 687-693
    Published: May 01, 2000
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    A simple magnetic circuit of a 279MVA pumped storage generator is presented. A method for calculating steady-state electrical performances using the circuit is described. Magnetic saturation including cross-magnetizing phenomenon is considered in the method. The saturated reactance, field current and load angle are calculated easily from the method without much computational effort as compared with the finite-element method. Despite the magnetic circuit is simple, the calculated reactances at various load conditions of the generator using the method agree with the measured and the FEM values. In particular, the values of the calculated mutual reactances between d- and q- axis and between field and q-axis show good agreement with the FEM values.
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  • Hirohito Funato, Kenzo Kamiyama, Atsuo Kawamura
    2000 Volume 120 Issue 5 Pages 694-700
    Published: May 01, 2000
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    Inductance has particularly important role in power circuits. Authors have proposed the Variable ActivePassive Reactance (VAPAR) which can produce a virtual variable inductance. In this paper, the transient power characteristics of a balanced three phase variable inductance is analyzed using instantaneous active and reactive power theorem. When an ideal voltage source or an ideal current source is connected with a balanced three phase variable inductance, the transient power is analyzed theoretically, then the results are verified through simulations. In the other cases, it is difficult to solve the transient power, however it is clarified that the transient power characteristics can easily estimated from the results of the simulations where an ideal voltage source or an ideal current source is connected with a balanced three phase variable inductance. Experiments are also carried out to verify the theoretical analysis and simulations.
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  • Hideo Okayama, Masato Koyama, Toshifumi Ise
    2000 Volume 120 Issue 5 Pages 701-709
    Published: May 01, 2000
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    In recent years, a motor drive system for a steel rolling mill is being a larger and larger capacity. Especially the development of the 3-level NPC (Neutral Point Clamped) inverters is focused on to replace the cycloconverters nowadays. In order to satisfy such a requirement, in this paper, a multiple 3-level NPC inverter system is proposed. The configuration is that two 3-level NPC inverters with the same configuration are connnected in parallel by current limiting reactors. In the case, a circulating current flowing between the two 3-level NPC inverters must be controlled to prevent the decrease of the maximum output capacity. Particularly, a new control method of the circulating current is mainly discussed. The method is on the basis of the space voltage vector PWM control for 3-level NPC inverters and the circulating current is controlled by re-adjusting each output period of the respective space voltage vector. According to the method, the circulating current controller can be decoupled with the motor current controller. Therefore, it is possible to design the different controllers independently. In addition, the experimental results show that the circulating current is limited under 2% of the rated motor current at the same time when the motor current response records more than 1000rad/s.
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  • Kazumasa Ide, Kenji Miyata, Kazuo Shima, Miyoshi Takahashi
    2000 Volume 120 Issue 5 Pages 710-717
    Published: May 01, 2000
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    An analysis method of quasi three-dimensional magnetic field of large turbine generators is presented. The presented method is based on sinusoidal approximation for potentials distribution of peripheral direction and anisotropic modeling of the iron teeth and stator slots. By the presented analysis, three-dimensional eddy current and magnetic flux, which is distributed in the turbine generator body and end portions, with considering non-linearity of BH curves of iron cores. Calculated eddy current and magnetic flux densities are shown to validate the method by comparison with measured ones of a 71MVA air cooled turbine generator.
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  • Takashi Onuki, Shinji Wakao, Ryoichi Hirakawa, Taketoshi Kusakabe
    2000 Volume 120 Issue 5 Pages 718-724
    Published: May 01, 2000
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    In information lines, copper wire cables have been replaced by optical fiber cables that cannot supply power to the optical network unit (ONU). Thus, in the case of disasters, communication function paralyses may take place. Therefore, the reliability of power supply to the ONU has become important in recent years. With this background, we have developed a PV system for the ONU. In the process of development, we have proposed a novel estimation method for PV systems, that enables us to easily grasp the relationship between the instruments in the system from an overall view by regarding the instruments as the black boxes and paying attentions only to the energy flows. The proposed method is useful in determining the suitable parameter arrangement of the PV system. Utilizing the method, we developed 100W-order PV systems and carried out the experimental operation for one year. The experimental results showed enough system performances to meet not only the design requirement but also the spatial constraint.
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  • Yoji Ishikawa, Tsutomu Mita
    2000 Volume 120 Issue 5 Pages 725-733
    Published: May 01, 2000
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    For position control applications such as hard disc drives or optical disc drives, conventional linear controllers with time varying position references result in overshoot or windup by large disturbances or model errors. Instead, mode switching control which consists of velocity control and position control is commonly used, still it has a transient response problem around the switching.
    This paper presents a new position control algorithm based on sliding mode control without the conventional switching model. By changing the control structure from velocity control to position control gradually along the optimal nonlinear sliding manifold, the controller gives the system quick settling and robustness. This idea is applied to DVD-optical disc drive seek-following servo system. The improved features are shown by 16bit DSP model base precise simulation.
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  • Takeshi Nagasawa, Tadaomi Miyazaki, Yasushi Nishida, Teruo Kawatsu
    2000 Volume 120 Issue 5 Pages 734-735
    Published: May 01, 2000
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    We developed the system which could preserve the large fresh food in the long term. The fruit emits ethylene gas with the aging effect. This mechanism is a method for decomposing C2H4 gas in which the fruit is released using the discharge. The discharge used the floating multielectrode in order to extend the discharge region.
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  • Hidetoshi Ikeda
    2000 Volume 120 Issue 5 Pages 736
    Published: May 01, 2000
    Released: December 19, 2008
    JOURNALS FREE ACCESS
    Download PDF (129K)
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