検索結果 1474 件
| JaLCDOI | 10.18926/15624 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_3_157.pdf |
| 著者 | Misaki Takayoshi| Okamoto Takuji| Kato Osamu| |
| 抄録 | In the analog circuits for the systms governed by the dilfercntial equations with the coefficients which are a function of one or mOre of the dependent variables, the magnitudes of their circuit elements must be variable in accordance with the nature of the function. Such circuit elements can be realized by means of inserting or removing the additional elements with high speed switches in the analog circuits. Particularly, in the case of varying stepwise this method is effective. But as an analog circuit is regarded as a short-time or repetitive type analyzer, the above switches must be instantaneous operation. In this paper, first, it is made sure by the experiments that some of the transistor switches arc met this condition, and moreover arc very low closed resistance, very high open resistance and neglegible small voltage offsets. Next, the basic technique for the direct analog simulation usiug transistor switches is described about the simple example, i.e. the oscillatory system with varying cross-scctional surge tank. Finally, as its applications, the transient problems of these oscillatory systems arc solved by means of these analog circuits. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1968-09-01 |
| 巻 | 3巻 |
| 号 | 1号 |
| 開始ページ | 157 |
| 終了ページ | 162 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307953 |
| JaLCDOI | 10.18926/15622 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_3_143.pdf |
| 著者 | Himei Toyoji| Inoue Jyunichi| Fukumori Kooichi| |
| 抄録 | A modified type of the resonant turn-off d-c chopprr using an auxiliary SCR, compared with its conventional one, has no limitation about its starting and also operates more steadily. Presented in this paper, making a comparison between the modified type and the conventional one, are the circuit analysis and its efficiency measurement from the point of view of overall efficiency, that is, the ratio of the output to the input. Furthermore, some effects of the source impedance, counter emf load, etc. are discussed. As a result, it has been analytically clarified that this modified type is different from the conventional circuit only by one terminal connection of turn-off capacitor, but has the features of uncompounded circuit configuration, no limitation about its starting and more steady operation. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1968-09-01 |
| 巻 | 3巻 |
| 号 | 1号 |
| 開始ページ | 143 |
| 終了ページ | 150 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307152 |
| JaLCDOI | 10.18926/15606 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_3_57.pdf |
| 著者 | Takahashi Teruo| Shimizu Kengo| |
| 抄録 | In this report the formation of bubbles at a single circular hole is considered theoretically, as a fundamental study on contacting devices for the purpose of mass transfer operation in chemical engineering. From many previous experimental data, it is found that the mechanism of bubble formation is classified into steady bubble growth system and potential bubble formation system. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1968-09-01 |
| 巻 | 3巻 |
| 号 | 1号 |
| 開始ページ | 57 |
| 終了ページ | 62 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307610 |
| JaLCDOI | 10.18926/15605 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_3_51.pdf |
| 著者 | Takahashi Teruo| Akagi Yasuharu| |
| 抄録 | The liquid phase mass transfer resistance in the Rotational-current tray is one of the most important factors in its design and performance. In this report, the holding time of liquid on the tray was studied experimentally by water-air system, and then the desorption tests were carried out by water-oxygen-air system that the liquid phase resistance were controlling. From the results of these experiments, it was found that the gas flow rate and the holding time of liquid on the tray control the tray efficiency strongly. Thus, the experimental equation for the number of transfer units based on liquid phase was derived. And also, it was found that this type of tray can be operated at high efficiency with a higher gas rate than the Kittel tray and the sieve tray without downcomer. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1968-09-01 |
| 巻 | 3巻 |
| 号 | 1号 |
| 開始ページ | 51 |
| 終了ページ | 56 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307343 |
| JaLCDOI | 10.18926/15591 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_2_120.pdf |
| 著者 | Himei Toyoji| Inoue Jyunichi| |
| 抄録 | This paper is presented on the operation of the phase controlled single-phase bridge circuit with a free-wheeling diode, which has capacitance in parallel with the inductive load. Such circuit configuration is frequently met with, for instance, at the time when the more smoothness of d-c voltage is required, the higher reliability of SCR's firing is taken into account or load windings include some capacitance which is not negligible. The capacitance influences not only largely upon SCR's rush current but also significantly upon control characteristics of the circuit such as wave forms, pulsating ratio and power factor etc. Here, the various effects of the capacitance on the circuit performance are discussed. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1967-04-01 |
| 巻 | 2巻 |
| 号 | 1号 |
| 開始ページ | 120 |
| 終了ページ | 126 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307335 |
| JaLCDOI | 10.18926/15577 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_2_50.pdf |
| 著者 | Takahashi Teruo| Akagi Yasuharu| |
| 抄録 | Recently various trays in which mass transfer operations are carried out have been developed, and the authors have designed one of the rotational-current tray which is designed to direct flow of ascending gas horizontally across the tray surface. In this report, as a fundamental study for mass transfer on this tray, flow mechanism and liquid holdup on the tray are considered experimentally. Experiments are carried out by water-air, methanol-water air and gricerinewater-air systems. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1967-04-01 |
| 巻 | 2巻 |
| 号 | 1号 |
| 開始ページ | 50 |
| 終了ページ | 54 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307498 |
| JaLCDOI | 10.18926/15558 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_1_130.pdf |
| 著者 | Wada Tsutomu| Ohgishi Shinji| |
| 抄録 | The method of the harmonic analysis of the human operator's characteristics by means of an analog computer is described. The human operator's characteristics in the closed loop system are described by vector locus. The human operator controls in response to the sine wave input so as to make constant the gain in the closed loop system. In accordance with the change of the input frequency, the operator changes his control action. Consequently the transfer function of the human operator's characteristics is too complex and difficult to be described by a linear element. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1966-03-31 |
| 巻 | 1巻 |
| 号 | 1号 |
| 開始ページ | 130 |
| 終了ページ | 133 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307865 |
| JaLCDOI | 10.18926/15556 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_1_116.pdf |
| 著者 | Takamatsu Takeichiro| Sayama Hayatoshi| |
| 抄録 | The identification or model building of system is the important problem for the dynamic optimization of chemical plant and it is desired that this mathematical model can be determined as quickly and as exactly as possible from experimental or operating data. Recently the identification of linear system has been studied, but there have been few papers on nonlinear systems. Especially, no approaches can be found to identify effectively a chemical reaction process which is a nonlinear and nonisothermal system. Except for the case in which the linearized model is enough to represent the approximate dynamic behaviour of the plant, system should be directly represented by nonlinear mathematical model in general. In this paper, the gradient method was applied to identify a nonlinear system. In this method, the parameters to be chosen optimally are regarded as timeinvariant control variables and they are numerically determined by using a high speed digital computer (KDC-I). As a numerical example, we choose a continuous stirred tank reactor with the first order exothermic reaction and show the procedure to determine the three parameters, that is, the order of reaction, the values of activation energy and frequency factor. It should be emphasized that this approach makes it possible to construct the mathematical model of nonisothermal chemical reaction processes only from input and output data. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1966-03-31 |
| 巻 | 1巻 |
| 号 | 1号 |
| 開始ページ | 116 |
| 終了ページ | 119 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307194 |
| JaLCDOI | 10.18926/15555 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_1_110.pdf |
| 著者 | Takamatsu Takeiciro| Sayama Hayatoshi| Tonoike Takao| |
| 抄録 | The batch chemical reaction is chosen as the process model to be optimized and the rate constants are functions of pressure only, as the reactions are assumed to occur isothermally. The time optimal control problem considered here means to determine the minimum time path from the given initial compositions to desired final compositions by manipulating the process pressure. A gradient method or a steepest-ascent method is applied to determine the control variable program by using the high speed digital computer. Numerical solutions are presented for the following three cases: (1) no constraint on the operating pressure ...... open and matched terminal constraint. (2) constraint on the operating pressure ...... open terminal constraint. (3) constant operating pressure ...... open terminal constraint. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1966-03-31 |
| 巻 | 1巻 |
| 号 | 1号 |
| 開始ページ | 110 |
| 終了ページ | 115 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307978 |
| JaLCDOI | 10.18926/15550 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_1_78.pdf |
| 著者 | Himei Toyoji| Inoue Jyunichi| Fukumori Kooichi| |
| 抄録 | The operation, mainly in a steady state, of a half controlled single-phase bridge circuit with a finite inductive load, has been treated analytically. Some operation features of particular bridge circuits are discussed. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1966-03-31 |
| 巻 | 1巻 |
| 号 | 1号 |
| 開始ページ | 78 |
| 終了ページ | 83 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307828 |
| JaLCDOI | 10.18926/15507 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_24_2_99.pdf |
| 著者 | 谷口 健男| Fujiwara Kohji| |
| 抄録 | This paper presents an effective solver for a large sparse set of linear algebraic equations, which appears at the application of the finite element and the finite difference methods in engineering field. Proposed method is a family of SKYLINE METHOD, and for faster computation on the vector processors the original skyline is modified with respect to following three items; the use of inner products of matrix operations, the removal of unnecessary numerical operations and the introduction of two-dimensional array for storing the data of coefficient matrix. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 1990-03-29 |
| 巻 | 24巻 |
| 号 | 2号 |
| 開始ページ | 99 |
| 終了ページ | 112 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307515 |
| JaLCDOI | 10.18926/15505 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_24_2_89.pdf |
| 著者 | 横平 徳美| |
| 抄録 | This paper considers a test set for an ALU with look ahead carry generators(LCGs). The ALU is logically partitioned into two groups of blocks, the group of one-bit operation units and LCG group. Each group is tested in parallel and exhaustively, independent of the other. And an easily testable design is applied to several blocks for decreasing the number of the input combinations of them. Under the easily testable design, a minimum test set for each group is generated, and the upper and lower bounds for a minimum test for the ALU are derived. The difference of the lower and upper bounds is not large, and a test set whose number of test vectors is equal to the upper bound can be easily obtained as the union of minimum test sets for two groups. Hence, the union can be used as a complete and practical test set for the ALU. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 1990-03-29 |
| 巻 | 24巻 |
| 号 | 2号 |
| 開始ページ | 89 |
| 終了ページ | 98 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307212 |
| JaLCDOI | 10.18926/15502 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_24_2_79.pdf |
| 著者 | 佐藤 洋一郎| |
| 抄録 | In asynchronous arbiters, failures may happen, caused by metastable operations. The purpose of this study is to derive a formula to estimate such failures in a ring arbiter as mean time between failures (MTBF), under the condition that incidences of requests issued in all devices are different from each other. The operation of the arbiter is formularized by a markov chain. This chain is used to decide the probability at which each of possible failures contributes to MTBF. The sum of such probabilities gives the MTBF which can be represented as a sum of a finite number of terms. As an example, MTBF of a ring arbiter composed of 3 cells is shown. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 1990-03-29 |
| 巻 | 24巻 |
| 号 | 2号 |
| 開始ページ | 79 |
| 終了ページ | 87 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307486 |
| JaLCDOI | 10.18926/15488 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_25_1_37.pdf |
| 著者 | Bouzidi, Moncef| 古賀 隆治| 和田 修己| 香川 直己| Hai, Xu| 小坂 恵| Sano, Hiroya| |
| 抄録 | Is proposed a tunable diode laser absorption spectrometer system which employs a pulsed current to drive the diode laser still implementing a second-harmonic detection methods enhancing a signal to noise up to 104 times that the case without it. This system affords the lead-salt diode laser a higher operating temperature which allows a more compact deep cooling system. A principle is based on employing a gated integrator between the preamplifier and the lock-in amplifier. Investigations are made on the optimum selection of the gating aperture time interval as determined by response time of the infrared detector and the pulse width of the laser driving current. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 1990-12-14 |
| 巻 | 25巻 |
| 号 | 1号 |
| 開始ページ | 37 |
| 終了ページ | 50 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307549 |
| JaLCDOI | 10.18926/15472 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_23_2_9.pdf |
| 著者 | Kuroda Tsutomu| 大崎 紘一| 松田 正明| Fujisawa Keita| |
| 抄録 | Multi-item flexible manufacturing systems have been spread to correspond the short life-cycle and the diversification of products. Part handling plays an important role to operate multi-functional robot efficiently in these systems, and many jigs are widely used to hold a part. They should be exchanged at once according to changing products. In this paper, we propose a pin jig which holds a part with two pins, and design method of the position, length and diameter of those pins for a cylindrical part. This jig has the following characteristics. As a surface of the jig is inclined to use gravity, the part can be fixed without any external forces. Therefore the structure of jig becomes simple, and loading and unloading of a part becomes easy for a robot hand. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 1989-03-30 |
| 巻 | 23巻 |
| 号 | 2号 |
| 開始ページ | 9 |
| 終了ページ | 19 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307693 |
| JaLCDOI | 10.18926/15410 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_26_1_9.pdf |
| 著者 | Uno, Yoshiyuki| Nakajima, Toshikatsu| Okada Minoru| |
| 抄録 | Practical utilization of ram type electrical discharge machining in uninflammable fluid has been expected in place of inflammable kerosine type fluid for unmanned operation in a workshop. The electrical discharge machining performance in deionized water is experimentally investigated on the basis of the analysis of the crater generated by a single pulse discharge. The experimental analysis makes it clear that the electrical discharge machining performance in deionized water is greatly affected by the electrode polarity. The metal removal rate in the normal polarity machining is higher than that in reverse polarity machining, while the electrode wear rate in the normal polarity machining is greater than that in reverse polarity machining. Therefore the electrode polarity should be properly selected according to the purpose of machining. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 1991-11-30 |
| 巻 | 26巻 |
| 号 | 1号 |
| 開始ページ | 9 |
| 終了ページ | 20 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307319 |
| JaLCDOI | 10.18926/15406 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_27_2_59.pdf |
| 著者 | Prokop Jiri| Myojin Sho| |
| 抄録 | The paper presents methods for simulation and examination of the performance of a classification yard, including both manual and computer-aided methods. Presented methods are applicable to the simulation and examination of full range of yards of different types and sizes including manually operated as well as highly automated classification yards. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 1993-03-25 |
| 巻 | 27巻 |
| 号 | 2号 |
| 開始ページ | 59 |
| 終了ページ | 71 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307384 |
| JaLCDOI | 10.18926/15404 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_27_2_41.pdf |
| 著者 | Prokop Jiri| Myojin Sho| |
| 抄録 | The fundamental objective of this paper is to aggregate and establish a set of practical principles, guidelines, and procedures to clarify and improve classification yard design and to enhance the efficiency of the design process. The paper primarily addresses theoretical and technical aspects of hump yard height and grade design, placement of the switches and the retarders. It attempts to compile and document yard design procedures, based on the Theory of Energy Head and Energy Loss. This procedures are applicable to the design of new yards, rehabilitation of the existing yards of different types and sizes including manually operated as well as highly automated classification yards. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 1993-03-25 |
| 巻 | 27巻 |
| 号 | 2号 |
| 開始ページ | 41 |
| 終了ページ | 58 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307241 |
| JaLCDOI | 10.18926/15399 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_27_2_1.pdf |
| 著者 | 梶原 康博| 大崎 紘一| |
| 抄録 | Precedence relation in assembly has been determined by experience only. Now, an expert system is developed for determining such precedence relation. The conjugate states of the units of a product are shown in face frames and unit frames following the frame model. Seven rules are formulated. They consider geometrical interference of units, and make the precedence relation enable operation time to be shorter, and the number of JIG and substandards to be smaller. These rules are programized by computer language(PROLOG). |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 1993-03-25 |
| 巻 | 27巻 |
| 号 | 2号 |
| 開始ページ | 1 |
| 終了ページ | 9 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307210 |
| JaLCDOI | 10.18926/15386 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_30_1_111.pdf |
| 著者 | Ye Ju| 田中 雅博| 谷野 哲三| |
| 抄録 | Mutation is one of the important operators in genetic algorithm. In traditional genetic algorithm, mutation is activated stochastically. In this way it is unknown and cannot be controlled for which individuals to be mutated. Therefore, it is unavoidable that some good individuals are destroyed by mutation and then the evolutionary efficiency of the genetic algorithm is dampened. Owing to this kind of destructivity of mutation, the operator of mutation has to be limited within a very small probability, and the potentiality of mutation is consequently limited. In this paper, we present an evolutionary chain-based mutation and a control strategy of reasonable competition, in which the heuristic information provided by the evaluation function is well utilized. This method avoids the blindness of stochastic mutation. The performance improved in this method is shown by two examples, a fuzzy modeling for the identification of a nonlinear function and a typical combinatorial optimization problem-the traveling salesman problem. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 1995-12-28 |
| 巻 | 30巻 |
| 号 | 1号 |
| 開始ページ | 111 |
| 終了ページ | 120 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307635 |