IEEJ Transactions on Industry Applications
Online ISSN : 1348-8163
Print ISSN : 0913-6339
ISSN-L : 0913-6339
Volume 111, Issue 4
Displaying 1-9 of 9 articles from this issue
  • Yasuo Maruyama, Mitsuo Shinbo
    1991 Volume 111 Issue 4 Pages 259-264
    Published: April 20, 1991
    Released on J-STAGE: December 19, 2008
    JOURNAL FREE ACCESS
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  • Yigang Cai, Takashi Sekiguchi
    1991 Volume 111 Issue 4 Pages 265-272
    Published: April 20, 1991
    Released on J-STAGE: December 19, 2008
    JOURNAL FREE ACCESS
    Up to now, the design and construction of SCS (Sequential Control Systems) have been performed by human experts. The Petri net modeling, which would be used as the formal specification in SCS is effective. As the result of the research and development of Petri net modeling, applications to FA, distributed discrete control systems, hardware and software of controllers, and simulation of SCS, have been reported. As the acquisition of knowledge is a main bottleneck now, computer aided design and construction of SCS is difficult.
    In this paper, using a Petri-net-based representation to specify SCS, we distinguish the abstract level of knowledge from the concrete level. We explain then, the concept acquisition in SCS by learning. Utilizing a concept's concrete knowledge, we make up a set of relations having partial order. From this set the minimal element, maximal element, and middle element obtained by a set partition may be acquired. In order to show the efficiency of the method developed in this paper, we discuss an example.
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  • Iwao Okutani
    1991 Volume 111 Issue 4 Pages 273-281
    Published: April 20, 1991
    Released on J-STAGE: December 19, 2008
    JOURNAL FREE ACCESS
    Since knowledge of motorists' route choice behavior as well as origin-destination flows takes an important role in traffic management and control over an expressway network, this paper presents two models of estimating origin-destination patterns and route flows simultaneously, both formulated in the framework of the Kalman filtering methodology. The one model employs as the measurement equation for link traffic counts the causal relationship between input flows from on-ramps and flows measured at off-ramps and/or mainline links, ignoring the travel time it takes for a vehicle to get to a specific link from its origin. The other model takes such travel time into account in establishing the measurement equations with the help of informations collected from a limited number of equipped vehicles incorporated in the automatic vehicle navigation system to be planned in the near future. For on-line application of the models a recursive algorithm is utilized which does not require any matrix inversion operation and is numerically accurate and stable. Finally, these models are tested by making use of synthetic data obtaind from digital traffic simulation executed for a small network. The results demonstrated that the presented models are capable of producing satisfactory estimates.
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  • Kenji Kaneko, Kouhei Ohnishi
    1991 Volume 111 Issue 4 Pages 282-288
    Published: April 20, 1991
    Released on J-STAGE: December 19, 2008
    JOURNAL FREE ACCESS
    This paper proposes an advanced control of flexible joint. Industrial robots generally have the elastic elements in the torque transmission. The torsional vibration is caused when the motion response is fast. This vibration deteriorates the motion of the joint. In the flexible joint control, it is important to increase the stability of the system in the wide motion range. In the proposed method, to obtain the stability of the system, state feedback is applied. For the purpose, the concept of an acceleration controller of the motor axis is applied. This controller is realized by the disturbance observer. The proposed method brings more robust control and the paper also shows the experimental results.
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  • Ryoichi Kurosawa
    1991 Volume 111 Issue 4 Pages 289-295
    Published: April 20, 1991
    Released on J-STAGE: December 19, 2008
    JOURNAL FREE ACCESS
    A deadbeat control (finite time settling control) is considered proper to sampled data control systems. In continuous control systems, required data are available at any instant and the control manipulation is incessantly carried out. A question may arise whether there are any controls only applicable to the sampled data control systems but not to the continuous ones. The author attempted to realize the deadbeat control in the continuous control systems and have discovered a new control named a continuous deadbeat control. The key of the continuous deadbeat control is a delay element in its controller. This control can be applicable to the sampled data control systems. The continuous deadbeat control is a robust control which is less susceptible to noise and parameter variations. The robustness is a feature of the continuous control systems. The response time can be made much shorter than that of conventional controls in the continuous control systems.
    This paper presents the continuous deadbeat control and describes its characteristics while making comparison with others.
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  • Toshio Fukuda, Fumihito Arai
    1991 Volume 111 Issue 4 Pages 296-302
    Published: April 20, 1991
    Released on J-STAGE: December 19, 2008
    JOURNAL FREE ACCESS
    This paper deals with an adaptive control problem of direct drive (DD) robotic manipulators with force sensor stiffness. Since DD motor has advantages to force control in robotic application, so that many works have been reported so far in control problems. However, the dynamic compensation for the sensor stiffness has little been reported so far, even though the force sensor in DD robots decreases the stiffness of the overall DD robots. In order to make use of high stiffness of DD motors itself in the servo loop, it is necessary to take into account the sensor stiffness for the high gain dynamic control. Therefore, an adaptive dynamic compensation method is introduced here in the vein of the model reference adaptive control to widen the applicability of the DD robots, because the feedback with the constant gains may cause unstable behaviors, depending on objects dynamics. The applicability of the proposed method could be verified with some experiments. Then this method is applied to nonlinear objects, such as rotary channel. The experiments show the better performance by the proposed method for the nonlinear compensation than the conventional feed-back control method. Thus, it is shown that the DD motor can have much wider applicabilities by the proposed adaptive force control.
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  • Takahiro Ara, Shoichi Oda, Kouki Matsuse
    1991 Volume 111 Issue 4 Pages 303-310
    Published: April 20, 1991
    Released on J-STAGE: December 19, 2008
    JOURNAL FREE ACCESS
    It is almost impossible to measure the starting performance of middle and large synchronous motors in a factory, bacause it needs a large capacity of equipments to test its performance.
    A new method is required to predict this performance by simple tests using a small capacity. This will make the motor's design and its accessories more rationalized.
    Authors propose a new method which is the combination of single phase AC applied test and usual routine test of synchronous machines.
    The key points of this method are summarized as follows:
    (1) A single phase voltage with commercial frequency is applied to armature terminals in a standstill condition. And this test must be performed twice in the same gap voltage, one for short-circuiting the field winding, the other for joining a resistance between the field terminals. Using these two test data including input power, the field and the damper winding impedances are separated from each other.
    (2) Solid poles resistance and reactance changes with a magnetic flux density and frequency. Therefore, authors assume the impeadance of solid poles to be a function of magnetic flux density and frequency from actual test values.
    The starting performance of a synchronous motor is predicted and agreed with actual data.
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  • Shigeyuki Funabiki, Toshinori Fujii
    1991 Volume 111 Issue 4 Pages 311-318
    Published: April 20, 1991
    Released on J-STAGE: December 19, 2008
    JOURNAL FREE ACCESS
    If a small capacity of superconducting magnetic energy storaga (SMES) is developed, it can be expected that the SMES equipped near to the consumer levels the load power fluctuation and compensates the reactive power rapidly. It leads the effective use of the power facilities. In this paper, the authors propose the control strategy of the SMES for levelling the load power fluctuation and compensating the reactive power. Then, the validity of the proposed method is discussed by simulation, The obtained results are summarized as follows.
    (1) The control method of the SMES is proposed with the estimation function taking account of the energy stored in the SMES and the levelling of load power fluctration.
    (2) The region of the proper weighting factors of the estimation function and the exponential smoothing method are obaained for the load power fluctuation. The levelling of the power following the sustained component of the load power fluctuation can be achieved by using the obtained weighting factors.
    (3) The effects of the energy capacity and the current ratings of the SMES on the levelling of the load power fluctuation and the compensation of the reactive power are clarified.
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  • Genjiro Wakui, Naoki Yuge, Tomotsugu Kubota
    1991 Volume 111 Issue 4 Pages 319-327
    Published: April 20, 1991
    Released on J-STAGE: December 19, 2008
    JOURNAL FREE ACCESS
    There are two purposes in this paper. The one is to divide the rotor of the hysteresis motor for the improvement of the characteristics. The divided rotor has slits inside the rotor ring as many as poles, and the rotor surface is sprayed with copper powder. The reason for making the character of salient pole by slits is to add the reaction torque to the hysteresis torque at synchronous speed, and the next reason is to add the large eddy current torque to the hysteresis torque in asynchronous period, due to used the high conductivity of copper.
    The other of purpose of this paper is analysis of the motor in synchronous and asynchronous periods. On the Cartesian coordinates, flux density distribution and vector potential are obtained by solving Maxwell's equations, and also the output is derived as vector power. Torque, current, efficiency, and power factor etc., derived from the equivalent circuit, and compared with the experimental values. The result of the andlysis gives good argeement compared with experimental values.
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