| JaLCDOI | 10.18926/14083 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_41_1_44.pdf |
| 著者 | 前野 良太| 小西 正躬| 今井 純| |
| 抄録 | Petri net model is a frequently-used versatile tool which can represent a widely discrete event system. However, when the scale of the system becomes large, the calculation time for solving optimal problem (optimal firing sequence problem) is markedly increased. In this paper, we propose an approximation method that achieves the efficiency improvement of the solution by decomposing the Petri net for solving the optimal firing sequence problem. A timed Petri Net is decomposed into several subnets in which the optimal firing sequence for each subnet is solved by Dijkstra’s algorithm in polynomial computational complexity. The effectivity of the proposed method is verified by numerical experiments for the flowshop schedule problem. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 2007-01 |
| 巻 | 41巻 |
| 号 | 1号 |
| 開始ページ | 44 |
| 終了ページ | 51 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002308128 |
| JaLCDOI | 10.18926/14097 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_40_1_9.pdf |
| 著者 | 貫名 高史| 小西 正躬| 西 竜志| 今井 純| |
| 抄録 | Controls of the temperature, pressure and flowing quantity are important for the stable operation of the product quality in the distillation tower. The usual measuring way of product quality estimation is made by the off-line analysis. In this paper, online estimation method of product quality is studied for improving the product quality. The estimation method based on stochastic analysis was developed for online estimation. In this paper, the data of temperature, pressure and flow volum in the distillation tower are treated. As the estimation models, RNN (Recurrent Neural Net Work) and PLS (Partial Least Square Regression Method) were adopted. The actual plant data were used in the analysis. Both PLS and RNN models could compensate each other to improve the accuracy in estimation. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 2006-01 |
| 巻 | 40巻 |
| 号 | 1号 |
| 開始ページ | 9 |
| 終了ページ | 15 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002308095 |
| JaLCDOI | 10.18926/14098 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_40_1_16.pdf |
| 著者 | 阿部 快洋| 小西 正躬| 西 竜志| 今井 純| |
| 抄録 | In this study, auto tuning of PID control gains in hot strip looper controller is made based on RNN model. Neuro emulator is employed to model the characteristics of looper dynamics. Combining neuro emulator and RNN model, auto tuning system of PID control gains is constructed. As the inputs to RNN, plural evaluation functions which reflect individual preference of human experts. Further, Self learning mechamism is embeded to RNN model which enables adaptation to the change in rolling chracteristics. Through numerical experiments, the effect of the proposed method is ascertained. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 2006-01 |
| 巻 | 40巻 |
| 号 | 1号 |
| 開始ページ | 16 |
| 終了ページ | 22 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002308615 |
| JaLCDOI | 10.18926/14099 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_40_1_23.pdf |
| 著者 | 菊池 純二| 小西 正躬| 西 竜志| 今井 純| |
| 抄録 | In steel works, iron ores are stored in ore yard and sent to various plants of down stream accoding to transfer requests. To attain stable operation, it is neccesary to keep a certain allowable stock level in ore tanks of all plants. To this purpose, ore transfer routing method has been developed based on decentralized agent method. In case of disaster such as a big earthquake or a big fire, damages in the facilities of industrial complex may be unavoidable. In this paper, decentralized optimization method is tested to cope with such emergencies. Decentralized agents corresponding to kind of ore make their own transfer route plan exchanging information with others. As the application of the proposed method, transfer scheduling in ore yard in steel works are made in case of destruction of transfer facilities. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 2006-01 |
| 巻 | 40巻 |
| 号 | 1号 |
| 開始ページ | 23 |
| 終了ページ | 30 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002308160 |
| JaLCDOI | 10.18926/14146 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_39_1_21.pdf |
| 著者 | 鳥越 崇史| 小西 正躬| 今井 純| 西 竜志| |
| 抄録 | In this paper, neuro based intelligent diagnosis methods for electro-mechanical control system are proposed. A self organizing map neural network (SOM) is used to classify measured data of the target system as a qualitative diagnostic method. Besides of the above procedure, it is expected to attain more efficient maintenance by a quantitative estimation of failure. For the purpose, new method is proposed using a hierarchical neural network (HNN). In the method, classified results by SOM are processed for the quantitative diagnosis. Hierarchical neural network can identify inner structure of the relations between failure causes and its results that enables a quantitative diagnosis. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 2005-01 |
| 巻 | 39巻 |
| 号 | 1号 |
| 開始ページ | 21 |
| 終了ページ | 27 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002308342 |
| JaLCDOI | 10.18926/14148 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_39_1_28.pdf |
| 著者 | 石丸 和史| 小西 正躬| 今井 純| 西 竜志| |
| 抄録 | In reactor furnace, due to high temperature and high pressure, data can be measured only near the furnace wall. In this paper, the way to estimate temperature distribution in a reactor furnace using measured data near the furnace walls and to control temperature distribution to the desired temperature distribution was studied. In the estimation, SQP method is employed using measured data near the furnace walls. As the result, the whole temperature distribution in a furnace could be obtained from such limited data. Furthermore, to control the temperature distribution in a reactor furnace, gas flow from multiple tuyeres and supplying material for controlling temperature distribution in a reactor furnace were determined by the SQP method. It was shown that temperature distribution in a furnace was regulated to achieve various desired distribution. Thus, it was verified that complicated temperature distribution in a reactor furnace could be controlled by combining furnace simulation and SQP method. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 2005-01 |
| 巻 | 39巻 |
| 号 | 1号 |
| 開始ページ | 28 |
| 終了ページ | 39 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002308270 |
| フルテキストURL | fulltext.pdf |
|---|---|
| 著者 | Tsunata, Ren| Yokomichi, Keito| Takemoto, Masatsugu| Imai, Jun| |
| キーワード | Variable flux memory motor hybrid excitation motor traction applications EV HEV six-step operation one-pulse drive output power density |
| 発行日 | 2023-08-03 |
| 出版物タイトル | IEEE Access |
| 巻 | 11巻 |
| 出版者 | Institute of Electrical and Electronics Engineers |
| 開始ページ | 82024 |
| 終了ページ | 82036 |
| ISSN | 2169-3536 |
| 資料タイプ | 学術雑誌論文 |
| 言語 | 英語 |
| OAI-PMH Set | 岡山大学 |
| 論文のバージョン | publisher |
| DOI | 10.1109/ACCESS.2023.3301809 |
| Web of Science KeyUT | 001047221300001 |
| 関連URL | isVersionOf https://doi.org/10.1109/ACCESS.2023.3301809 |
| JaLCDOI | 10.18926/15269 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_35_47.pdf |
| 著者 | 堂前 行宏| 小西 正躬| 今井 純| Asada, Hideki| Kitamura, Akira| |
| 抄録 | In this paper, an identification method of motor parameters for the diagnosis of rotor bar defects in the squirrel cage induction motor is proposed. It is difficult to distinguish the degree of deterioration by a conventional diagnostic method such as Fourier analysis. To overcome the difficulty, a motor simulator is used to identify the degree of deterioration of rotors in the squirrel cage induction motor. Using this method, the deterioration of rotor bars in the motor can be estimated quantitatively. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 2001-03-27 |
| 巻 | 35巻 |
| 号 | 1-2号 |
| 開始ページ | 47 |
| 終了ページ | 51 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307181 |
| 著者 | Tsunata, Ren| Takemoto, Masatsugu| Imai, Jun| Saito, Tatsuya| Ueno, Tomoyuki| |
|---|---|
| キーワード | Aspect ratio axial-flux machine axial-gap motor cooling high efficiency mass production PMSM radial-flux machine soft magnetic composite thermal characteristic |
| 備考 | © 2023 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.| This fulltext file will be available in Mar. 2025.| |
| 発行日 | 2023-03-13 |
| 出版物タイトル | IEEE Transactions on Industry Applications |
| 巻 | 59巻 |
| 号 | 3号 |
| 出版者 | Institute of Electrical and Electronics Engineers (IEEE) |
| 開始ページ | 3353 |
| 終了ページ | 3367 |
| ISSN | 0093-9994 |
| NCID | AA00667900 |
| 資料タイプ | 学術雑誌論文 |
| 言語 | 英語 |
| OAI-PMH Set | 岡山大学 |
| 著作権者 | © 2023 IEEE. |
| 論文のバージョン | author |
| DOI | 10.1109/tia.2023.3255845 |
| Web of Science KeyUT | 001061319100099 |
| 関連URL | isVersionOf https://doi.org/10.1109/tia.2023.3255845 |
| JaLCDOI | 10.18926/44495 |
|---|---|
| フルテキストURL | mfe_045_001_014.pdf |
| 著者 | Akiyoshi, Tatsuro| Imai, Jun| Konishi, Masami| |
| 抄録 | This paper presents a method of the controller design for the handling machine by using dsPIC(Digital Signal Processor + Peripheral Interface Controller). Recently, many manufacturing robots are operated in manufacturing facilities, with the aim of labor, cost saving, and improvement of the productivity. Such robots need to have positioning performance of high precision and simultaneously to save cost. In this paper, a digital optimal servo controller is designed, and it is implemented into our barebones controller which involves dsPIC. We have designed and manufactured the controller which is added suitable peripherals to improve the consistency between the mechanical machine operating in continuous time and controller in discrete time. The significance of this research is that digital implementation of the embedded system which has performance-limitation has ensured a comparable result, against the one with PC which has broad utility. When it is used as a controller, it is possible to restrain product prices greatly equivalent PC precision. We demonstrate potential that good control can be achieved even with low cost. Our research has lead to the viability of lower cost and higher performance system for the production process at factories. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 2011-01 |
| 巻 | 45巻 |
| 開始ページ | 1 |
| 終了ページ | 14 |
| ISSN | 1349-6115 |
| 言語 | 英語 |
| 著作権者 | Copyright © by the authors |
| 論文のバージョン | publisher |
| NAID | 120002905951 |
| JaLCDOI | 10.18926/17835 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_43_32.pdf |
| 著者 | 馬渕 周治| 小西 正躬| 今井 純| |
| 抄録 | A tractor-trailer vehicle in the factory might move on the route determined beforehand. However, automation of a tractor-trailer vehicle is difficult so that it is necessary to consider the nonlinearity of a vehicle and a trailer. In this research, the effective tracking control method of a tractor-trailer vehicle is proposed. The control method using time-state control form for a preview control is presented, and be applied a tractor-trailer vehicle with nonholonomic characteristics. Results of numerical experiments are presented to check effectiveness of the proposed control method. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 2009-01 |
| 巻 | 43巻 |
| 開始ページ | 32 |
| 終了ページ | 38 |
| ISSN | 1349-6115 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002308736 |
| JaLCDOI | 10.18926/17837 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_43_39.pdf |
| 著者 | 桑嶋 崇行| 今井 純| 小西 正躬| |
| 抄録 | This paper presents method of the controller design for one link arm with parametric uncertainty. Recently, many manufacturing robots are operated in manufacturing facilities, with the aim of labor and cost saving or improvement of the productivity. Such robots need to have positioning performance of high precision. In condition that there is an uncertainty in plant dynamics, desired control performance may not be attained because the controller is designed according to the mathematical model of a plant. So it is important that the designed control system have a robust control performance. In this paper, the robust controller is designed using Quantitative Feedback Theory (QFT) for one link arm with parametric uncertainty. Simulation experiments are run for control system designed by using QFT and conventional method. The results are compared with each other and it is found that the control system designed by QFT shows a robust performance and can suppress the unevenness of output against parametric uncertainty. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 2009-01 |
| 巻 | 43巻 |
| 開始ページ | 39 |
| 終了ページ | 48 |
| ISSN | 1349-6115 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002308875 |
| JaLCDOI | 10.18926/17839 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_43_49.pdf |
| 著者 | 赤松 慎也| 小西 正躬| 今井 純| |
| 抄録 | In this paper, the controlled target is the SCARA robot with two links, and the object is fine control of the arm head position of the robot. To attain the object, Internal Model Control (IMC) is introduced. A nonlinear equations are for robot dynamics formulated by solving Lagrange equation, and is linearized to design control system by IMC. The controller of IMC is designed or synthesisted as the inverse system of the linearized model, and IMC filter model is selected. Also, reference filter is introduced to make the improvement of performance. The result of control performance by IMC is compared with that of PID numerically, accuracy and incoherency are confirmed. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 2009-01 |
| 巻 | 43巻 |
| 開始ページ | 49 |
| 終了ページ | 54 |
| ISSN | 1349-6115 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002308854 |
| JaLCDOI | 10.18926/17841 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_43_55.pdf |
| 著者 | 井上 真一郎| 小西 正躬| 今井 純| |
| 抄録 | In this research, an image processing method and a system for inspection support of a rod figured cutting tool are developed. As is well known, the visual inspection of a cutting tool by image processing is not easy, because cutting blade have a helical blade structure. To cope with the problem, an experimental facility with rotation and longitudinal tool shift functions to enable acquisition of blade surface pictures along a cutting rod is developed. The type of the defect treated in this paper is the spot of coating on blade surface. To judge the quality of the processed image of blade surface, neural network with autonomous learning is used. The processed image of cutting tool is divided into 64 × 64 blocks used for the input to the neural networks. Before input, each block data is preprocessed applying a edge detection filter and a transformation by the discrete fourier transform (DFT). Using these technologies, the experimental inspection system is built and tested to check the capabilities of the inspection algorithms. The diagnostic performance of the surface defect of a cutting tool was confirmed. There remained a problem to mis judge the normal tools as the defect. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 2009-01 |
| 巻 | 43巻 |
| 開始ページ | 55 |
| 終了ページ | 60 |
| ISSN | 1349-6115 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002308973 |
| JaLCDOI | 10.18926/17844 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_43_75.pdf |
| 著者 | 大江 啓太| 小西 正躬| 今井 純| |
| 抄録 | As is well known, an advanced knowledge and know-how are needed in the design and the diagnosis work. Further, human experts can cope with the recent trend of customers needs. Therefore, the design and the diagnosis work have been privately performed in the past, and its information cannot be shared. In addition, the number of experts is decreasing. It is a very important problem to maintain and to extend experts technologies having been built up. For the purpose, methods and systems for technical inheritance of the advanced techniques of the skilled engineers are needed to train the unskilled operators and also can assist skilled operators. In this research, attention is focused on the design of analog filter circuit. To attain the target, the circuit structural classifier system to support design work is developed. Furthermore, simulation technology for hot strip rolling mills based on distributed agents is presented aimed to develop tools for the diagnosis of hot strip rolling mills operation. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 2009-01 |
| 巻 | 43巻 |
| 開始ページ | 75 |
| 終了ページ | 92 |
| ISSN | 1349-6115 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002308900 |
| フルテキストURL | fulltext.pdf |
|---|---|
| 著者 | Tsunata, Ren| Takemoto, Masatsugu| Imai, Jun| Saito, Tatsuya| Ueno, Tomoyuki| |
| キーワード | Pressing Stator cores Magnetic cores Torque Atmospheric modeling Presses Manufacturing Mass production Axial-flux permanent magnet machine soft magnetic composite (SMC) PMSM tooth-tips torque press process semi-closed slot structure axial gap motor mass production YASA motor shoe |
| 発行日 | 2023-10-04 |
| 出版物タイトル | IEEE Access |
| 巻 | 11巻 |
| 出版者 | Institute of Electrical and Electronics Engineers |
| 開始ページ | 109435 |
| 終了ページ | 109447 |
| ISSN | 2169-3536 |
| 資料タイプ | 学術雑誌論文 |
| 言語 | 英語 |
| OAI-PMH Set | 岡山大学 |
| 著作権者 | © 2023 The Authors. |
| 論文のバージョン | publisher |
| DOI | 10.1109/ACCESS.2023.3321829 |
| Web of Science KeyUT | 001086321100001 |
| 関連URL | isVersionOf https://doi.org/10.1109/ACCESS.2023.3321829 |