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Volume 37, Issue 5
Displaying 1-15 of 15 articles from this issue
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Takayuki SUGITA, Yoshifumi KITAYAMA, Fujio JOHKOH2001 Volume 37 Issue 5 Pages 383-388
Published: May 31, 2001
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSSo far, we have established the measuring method for pulverized particle coal distribution by an image analysis system with an optical microscope. In this method however, we need to assume a particle height by correlation with an equivalent particle diameter because only two-dimensional image information is available. Moreover, we use a constant particle shape coefficient as a sphere approximation to get an equivalent particle volume.
In order to decrease data processing time and secure confidence in measurement, we introduced a direct and consecutive particle height measuring technique using laser diodes. In this paper, we propose a new image analysis system with higher precision by incorporating a new particle shape coefficient into this technique. The particle diameter obtained by our method was compared with that acquired by our three-dimensional particle diameter measuring method. As a result, it was confirmed that our image analysis system can be more practically used.View full abstractDownload PDF (2577K) -
Hiroshi TAKAMI2001 Volume 37 Issue 5 Pages 389-396
Published: May 31, 2001
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSA synchronous motor (SM) with q-axis special field-winding of which q-axis field-current compensates and cancels armature reaction can be driven at unity power factor on condition of transient process as well as steady state. The motor operates in high efficiency on all conditions due to unity power factor similar to characteristics of DC motor. However, in order to extract maximum performance of the motor, it is required that the time constant of armature circuit corresponds to that of q-axis field circuit. Inverse LQ (ILQ) design method on a basis of the pole placement is suitable for this problem: (1) the time constants of the output responses can be designed for desired specifications, (2) relations between feedback gains and response of closed loop system are very clear and (3) optimal solutions can be given by simple procedure of ILQ method without solving the Riccati equation, compared to the usual LQ design method. The responses of armature current coincide with q-axis field-current, so that we can realize a high-performance motor with unity power factor and high efficiency. In this paper, it is proved that ILQ design method is very effective for optimal regulator design for the plant and gives excellent characteristics by numerical simulations and experiments.View full abstractDownload PDF (1012K) -
An Approach Based on Curvature Model of DisturbancesJin-Hua SHE, Michio NAKANO, Li-Li WANG2001 Volume 37 Issue 5 Pages 397-402
Published: May 31, 2001
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSThis paper proposes a new approach to disturbance estimation based on a curvature model to improve the rejection performance of disturbances in a repetitive control system. The main feature is that the stability of the repetitive control system is guaranteed when the estimated disturbance is incorporated directly into the designed repetitive control law. Simulation results show that disturbances are rejected efficiently when this approach is used.View full abstractDownload PDF (1285K) -
Ken'ichi YANO, Naoki OGURO, Kazuhiko TERASHIMA2001 Volume 37 Issue 5 Pages 403-410
Published: May 31, 2001
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSIn many industries, there exist a lot of transfer systems with a vibration mechanism, for example, a crane system, a robotic manipulator, an automatic pouring system, a liquid container transfer system, and so on. For these plants, although it is demanded to transfer without any vibration, many sensors and complicated models are needed for the control design. Therefore in this paper, a control design method to suppress the vibration without direct measurement of the vibration is newly presented. A proposed method consists of two parts. First, the frequency characteristics of the controller comprised of control elements with simple structure such as a notch filter and a low pass filter, is shaped into the desired characteristics aiming at vibration suppression and robust performance. Next, various parameters of some control elements are determined by solving an optimization problem with penalty terms expressed by the constraints of both the time-domain and the frequency-domain under the consideration of transient response, limitation for overshoot, restriction of input magnitudes. The proposed method is applied to a liquid container transfer system. An obtained controller demonstrates the good performance for all demands. The effectiveness of the control system is shown by simulations and experiments.View full abstractDownload PDF (1496K) -
Hiromi MOCHIYAMA, Kunihiko HIRAISHI2001 Volume 37 Issue 5 Pages 411-418
Published: May 31, 2001
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSIn this paper, a new stability concept of Timed Discrete-Event Systems (TDESs) is proposed. This is an extension of the stability of non-timed discrete-event systems proposed by Ozveren et al. to TDESs, but not simple one because degree of stability is introduced to measure stability performance. We give algorithms to check the stability and to calculate the optimal stabilizing supervisor achieving a given stability degree in the sense of minimum restriction.View full abstractDownload PDF (1466K) -
Wen NIAN, Kozo OKAZAKI, Hiroki KAKIUCHI, Takashi HOSHI, Kiyoshi TORII2001 Volume 37 Issue 5 Pages 419-424
Published: May 31, 2001
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSA direct image and its mirror image compose a plane symmetry. In this paper, we match with feature points of their images by using genetic algorithm and the information of the apexes connections and the plane symmetry. The constraint is that the planes and the apexes of the mirror images appear as inverse order of the direct image. Supposing the order of the apexes in the direct image are fixed in advance. We present an algorithm to arrenge the apexes order of the images, where the evaluation function of matching is a summation of the correctly corresponding apexes and are searched for the matching to be maximum. We demonstrate that the images including occluded apexes or undetected segments of lines are possible to be matched.View full abstractDownload PDF (1468K) -
Toshio TSUJI, Osamu FUKUDA, Mitsuru MURAKAMI, Makoto KANEKO2001 Volume 37 Issue 5 Pages 425-431
Published: May 31, 2001
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSElectromyogram (EMG) contains information on human movements such as his or her intended motions as well as force levels of muscles, and may be suitable as an input signal for a new human-computer interface tool. In the proposed method, several numbers of base directions are set on a computer display, and a posteriori probabilities that a pointer will move to the base directions are estimated from the EMG signals. Then, operator's intended directions can be estimated as a combination of the finite number of the probabilities corresponding to the base directions. From experiments, it is shown that the pointer movements can be controlled successfully by using the proposed method. Applicability of the proposed method for use of amputees is also examined.View full abstractDownload PDF (3320K) -
Hiroyasu OSHIMA, Hiroaki TAKANO, Takahiro SHIMADA2001 Volume 37 Issue 5 Pages 432-437
Published: May 31, 2001
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSAn analog arithmetic circuit is generally composed of an operating amplifier and one or more resistors and capacitors. Different arithmetic functions of the circuits are realized by changing the circuit configurations. These analog arithmetic circuits can be converted into equivalent digital arithmetic circuits, each consisting of one or more adders, coefficient units and integrators. By adding a configuration control circuit to the above, a programmable integrated circuit (IC) which performs a variety of arithmetic functions is obtained. This paper reports the realization of such programmable ICs. Our future aim is faster calculation of the phenomena expressed in differential equations.View full abstractDownload PDF (652K) -
II Carrier Sequence Control of AGV Transportation System Based on Diversity-Regulation of StrategyToshimitsu HIGASHI, Kosuke SEKIYAMA, Toshio FUKUDA2001 Volume 37 Issue 5 Pages 438-445
Published: May 31, 2001
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSThis paper proposes a system, which realizing a collective autonomous behavior such as an autonomous conveyance order formation in the AGV (Auto Guided Vehicle) transportation system. We attempt to deal with a large scale distributed autonomous system in dynamic environment feasibly. We have worked to realize the dynamically reconfigurable formation in the dynamic environment, and we showed that the dynamically reconfigurable formation emerges as the autonomous conveyance order formation of AGV transportation system in the dynamic environment. But It could not be mentioned when the restoration of the unloading success probability was caused by the self-organization, since the index of the self-organization is not clarified. In this paper, We define a strategy diversity as an index to the self-organization, and it is shown that it carries out the restoration of the unloading success probability with the diversity-regulation process of the strategy. Moreover, it is shown that adaptable parameters to the dynamic environment can be found by a distribution of “Self-organizing velocity”, which is difference of strategic diversity.View full abstractDownload PDF (3437K) -
An Approach Based on Integrated Petri Net ModelYoungWoo KIM, Akio INABA, Tatsuya SUZUKI, Shigeru OKUMA, Tadanao ZANMA ...2001 Volume 37 Issue 5 Pages 446-454
Published: May 31, 2001
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSScheduling of manufacturing process is one of the significant problems in FMSs. Requirements for the FMSs' scheduling are stated as follows: 1) It is easy to formulate a problem. 2) Semi-optimal solution can be found within short time. 3) It is possible to search the action in a reactive manner (action search depending only on a current state of the system). The property 3) is required to adapt to unexpected changes in production requests and/or machine breakdowns. However, no scheduling method which meets these requirements, has been proposed yet. This paper presents a new scheduling method based on problem formulation with Petri net and reactive graph search. Firstly, a new modeling method based on Petri net is proposed, in which physical behavior in FMSs and processing information of job are described independently. Secondly, a new reactive scheduling based on RTA* algorithm and supervisors (dispatching rules) is proposed. In the proposed framework, machine and AGV allocations can be scheduled simultaneously. Finally, usefulness of the proposed algorithm is confirmed through numerical experiments.View full abstractDownload PDF (2538K) -
Hidenori KAWAMURA, Masahito YAMAMOTO, Azuma OHUCHI2001 Volume 37 Issue 5 Pages 455-464
Published: May 31, 2001
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSIn this paper, we focus on the emergence phenomenon related with artificial pheromone communication and swarm intelligence among many agents in Ants War environment, in which two colonies of artificial ant agents compete for the limited number of food items in order to survive in evolutionary process. The purpose of this research is to clarify the emerging process of communication and the relationship between communication and swarm intelligence. For investigation of communication, we introduce Shannon's entropy and the amount of information to externally measure “the effectivity of communication signals for decision-making of agents” and “the specialty of environmental situation in sending communication signals”. In computer simulations, we confirm that the amounts of information of pheromone sensory inputs and selecting of sending pheromone signal are increased with correlation according to the progress of evolution. These experimental results derive that evolutionary communication is incrementally formed by the interaction among agents with self-organization and the self-reinforcement in communication-loop of repeated sending and receiving signals. In addition, we confirm the level of swarm intelligence with evolved pheromone communications by measurement of the correlation between the size of swarm and the performance in Ants War. In investigation, we find that the size of swarm and emergence of swarm intelligence are strongly related. The results introduced in this research will be a base for investigation of multi-agent communications.View full abstractDownload PDF (3789K) -
Ryouji MATSUI, Yayoi YAMANE, Tsumoru OCHIAI2001 Volume 37 Issue 5 Pages 465-467
Published: May 31, 2001
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSWe could detect a circular pillar position, using Hough transformation on vertical edges. But, we can extend the method to the detection of the rectangular pillar position, using some given data by an approximated calculation. On the method using 2 parameters or 3 parameters, we experimented. The method and the some results are shown here.View full abstractDownload PDF (1180K) -
Juntaro ISHII, Tomoko FUKUZAKI, Tetsuo FUJIHARA, Akira ONO2001 Volume 37 Issue 5 Pages 468-470
Published: May 31, 2001
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSAn optical ray-tracing approach based on the Monte Carlo method is developed to evaluate the angular dependence of the effective emissivities of blackbody cavities. A design of the cavity shape for the wide view-angle infrared thermometers and the ear thermometers is presented.View full abstractDownload PDF (1012K) -
A Method Utilizing the Dynamics of Feedback ControllerMitsuo HIRATA, Kenzo NONAMI2001 Volume 37 Issue 5 Pages 471-473
Published: May 31, 2001
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSThis paper proposes a design method of two-degree-of-freedom controllers for sampled-data control systems. The formula of the controller and the simulation results are shown.View full abstractDownload PDF (390K) -
Kiyoyuki KAWATO, Takao MORIHARA, Yoshiaki TAKABATAKE2001 Volume 37 Issue 5 Pages 474-476
Published: May 31, 2001
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSIn a waste melting furnace, melting waste volume is an important factor for melting control but has been unknown. Applying a laser radar system, we have developed a sensor to measure the melting surface height enabling a good control in a pyrolysis melting furnace.View full abstractDownload PDF (1527K)
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