巻号一覧
25 巻, 3 号
選択された号の論文の17件中1～17を表示しています
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堀内 道治1989 年 25 巻 3 号 p. 265-270
発行日: 1989/03/30
公開日: 2009/03/27
ジャーナル フリーConventionally, the use of an orifice for flow measurement is restricted within the range of Reynolds number as is prescribed by the standard to which our reference is made for flow coefficient, gas expansion correction factor, and so on. It is however necessary to have knowledge of the coefficient at lower Reynolds numbers, when the rate of flow to be measured possibly varies over an extensively wide range of the number.
This paper describes an experimental determination of the flow coefficient of an orifice for the steady flow whose rate is made to change over a considerably wide range of Reynolds number by the use of air, water and aqueous solutions of glycerine as fluid of flow.
By the use of the data obtained, an empirical formula is derived which expresses the coefficient as a function of the Reynolds number corresponding to the flow. This formula is found to be also applicable to direct calculation of the flow from the measurement of differential pressure without going through estimating thereof Reynolds number as long as only kinematic viscosity of the fluid at the time is known.抄録全体を表示PDF形式でダウンロード (797K) -
岡 和彦, 三橋 渉, 山崎 弘郎1989 年 25 巻 3 号 p. 271-277
発行日: 1989/03/30
公開日: 2009/03/27
ジャーナル フリーThe spatial filtering method is useful for the non-contact velocity measurement of moving object on which a random surface pattern or texture exists. A remarkable feature of this method is the simple structure and rapid response of optical parallel processing. However, there remains a serious problem that no signal is obtained if the characteristic frequency is not contained in spatial frequency components on the object's surface. In order to overcome this problem, pitch of the spatial filter must be adjusted to match the spatial frequency characteristics of the object's surface. But it is difficult to change the shape of the parallel slit reticle of the conventional spatial filter.
In this paper, we propose an electronic spatial filter utilizing an imaging device and full digital circuits. Various shapes of weighting function of spatial filter can be easily realized by this approach. A dual spatial filter having orthogonal sinusoidal weighting function is implemented. Its output can be utilized to sample a spatial frequency component out of the object surface.
An intelligent velocity sensing system is fabricated. It can evaluate the matching of filter performance with its object and adjust the reticle pitch automatically to meet change in the characteristics of the object surface. Features of this system is proven by experiments.抄録全体を表示PDF形式でダウンロード (984K) -
小金澤 鋼一1989 年 25 巻 3 号 p. 278-284
発行日: 1989/03/30
公開日: 2009/03/27
ジャーナル フリーA recursive algorithm for calculating the Walsh coefficients (Recursive Walsh Transform; RWT below) is developed. The proposed algorithm updates the Walsh coefficients being previously calculated using the past 2n time-series data, by the consecutively sampled datum. The software based on the proposed algorithm is composed and demonstrated. The execution time of one step (updates the Walsh coefficients one time) is faster than the FWT's about four times. A method of calculating a consistent Walsh power spectra based on the proposed RWT algorithm is also presented and demonstrated. Finally time-variant sequency of the input data is estimated step by step using the RWT algorithm. The result is that the real-time computing procedures based on the RWT algorithm estimates the value of the time-variant sequency accurately with the delay of only two or three periods of input data provided that the values of the involved weighted coefficients are appropriately assigned.抄録全体を表示PDF形式でダウンロード (680K) -
北島 雲平, 柏木 濶1989 年 25 巻 3 号 p. 285-289
発行日: 1989/03/30
公開日: 2009/03/27
ジャーナル フリーA new method is proposed for the identification of a linear system as well as a nonlinear system by use of a exponentially weighted antisymmetric M-sequence signal.
At first, some properties of the exponentially weighted antisymmetric M-sequence are summarized and it is shown that the Wiener-Hopf type integral equation can be easily deconvoluted when we use the exponentially weighted antisymmetric M-sequence as an input to the system. The impulse response can be easily obtained from the crosscorrelation function between the input and the output of the system, by simply multiplying by the known factors.
This method can be applied for identifying a non-linear system, and the first-order Volterra kernel is obtained without being affected by the second-order kernel.
The results of computer simulation show good agreement with the theoretical consideration.抄録全体を表示PDF形式でダウンロード (494K) -
師玉 康成, 太田 豊生1989 年 25 巻 3 号 p. 290-297
発行日: 1989/03/30
公開日: 2009/03/27
ジャーナル フリーA family of first-order algorithms for solving unconstrained nonlinear optimal control problems is presented. This method is based on the invariant imbedding and the successive approximations. The followings are considered to be the advantage of this method:
(a) the algorithms are simple;
(b) the choice of the initial approximation in this method is not so sensitive as in the second-order algorithms;
(c) it is not required in these computations to find appropriate parameters in contrast with the case of gradient methods.
Using the fixed point theorem, this paper explains the sufficient conditions for L1-convergence of the proposed algorithms.抄録全体を表示PDF形式でダウンロード (879K) -
Koichi MIZUKAMI, Siying ZHANG, Hua XU1989 年 25 巻 3 号 p. 298-303
発行日: 1989/03/30
公開日: 2009/03/27
ジャーナル フリーIn this paper, three-person deterministic Stackelberg game problems with a linear hierarchical decision structure are considered in a general Hilbert space setting. The existences and the constructions of the optimal affine incentive strategies for both the leader and one of the followers are studied by a vector space approach. A special class of problems are solved as an application of the theory, and the explicit optimal affine incentive strategies are obtained.抄録全体を表示PDF形式でダウンロード (738K) -
杜 宏業, 早川 義一, 藤井 省三1989 年 25 巻 3 号 p. 304-310
発行日: 1989/03/30
公開日: 2009/03/27
ジャーナル フリーAs is well known, for each proper transfer matrix of the linear time-invariant system, there exist coprime factorizations over RH∞, and these can be used to construct the set of all proper real-rational controllers stabilizing the plant. By choosing controllers from the set, we can solve the problem of robust control and the problem of H∞ optimal control. For decentralized linear time-invariant control systems, it is also necessary to look for the set of all proper real-rational decentralized controllers so as to solve the problem of the decentralized robust control and that of the decentralized H∞ optimal control. The stable factorization of the plant's transfer function matrix for the decentralized controllers can take a special form which we call decentralized coprime (d-coprime) factorization. This paper shows that the set of decentralized controllers that stabilize the plant can be found by using the unimodular matrices which keep up the property of d-coprime factorization. The problems of robust and H∞ optimal control for decentralized systems are provided with the same form as that of the problem of general systems, except for the numbers of the free parameters.抄録全体を表示PDF形式でダウンロード (833K) -
崔 霖, 武藤 康彦, 市川 邦彦1989 年 25 巻 3 号 p. 311-318
発行日: 1989/03/30
公開日: 2009/03/27
ジャーナル フリーA new algorithm of calculating the lower left triangular interactor matrix with arbitrary zeros for the linear multivariable systems is presented in this paper. The algorithm consists of two processes; i.e., selecting linear independent vectors from Γ-matrix which is a real matrix formed by the Markov parameters of the plant and solving the linear algebraic equation. The operation of polynomials and rational functions can be avoided. The interactor matrix obtained here has a row proper form and the degree of each element can be specified by the structure of Γ-matrix.抄録全体を表示PDF形式でダウンロード (906K) -
河野 通夫, 鈴木 達雄, 森下 隆1989 年 25 巻 3 号 p. 319-324
発行日: 1989/03/30
公開日: 2009/03/27
ジャーナル フリーThis paper proposes a method of characteristic multiplier assignment of linear ω-periodic continuous time systems by “multirate sampled state periodic hold (MSSPH)” control.
In “sampled state periodic hold (SSPH)” control presented by Kabamba, the sampling interval has to be equal to ω. On the contrary, in MSSPH control, sampling instants chosen arbitrarily can be added within one period. It is shown that the system discretized by MSSPH control is reachable if and only if the original system is controllable.
On the basis of the eigenvalue assignment problem in periodic discrete-time systems, it is shown that the characteristic multipliers can be assigned iff the open-loop system is controllable, and under an additional assumption the whole monodromy matrix is assignable.This method is illustrated by a numerical example.抄録全体を表示PDF形式でダウンロード (675K) -
馬 正東, 浅田 春比古, 得丸 英勝1989 年 25 巻 3 号 p. 325-332
発行日: 1989/03/30
公開日: 2009/03/27
ジャーナル フリーProperties of solutions to the inverse dynamics problem of n-link, planar, flexible manipulator arms are analyzed. Conditions for the solution to be meaningful and usable as control commands are obtained. It is shown that, when a given trajectory to follow comprises the same frequency components as the extended natural frequencies of the arm structure, the solution to the inverse dynamics problem, which is provided as actuator torque commands, bocomes oscillatory and divergent with time. The divergence of actuator torque commands also occurs when any two of the extended natural frequencies are the same. Guidelines for the design of the flexible arm as well as the planning of the endpoint trajectory are then provided. Analytical results are verified through simulation.抄録全体を表示PDF形式でダウンロード (1084K) -
張 玉武, 長谷川 健介1989 年 25 巻 3 号 p. 333-339
発行日: 1989/03/30
公開日: 2009/03/27
ジャーナル フリーThis paper deals with an autonomous surface tracking control. The novel control system comprises the principle of the Autonomous Trajectory Generating Servomechanism (in short, ATGS) and the multifunctional proximity sensor for simultaneous measurements of the distance and two dimensional inclination angles of an object's surface (Both of which were developed by authors).
At first, the principle of ATGS is explained briefly. The ATGS system has a trajectory planner in the control loop and realize the trajectory from a nominal path given as the intersection of two surfaces and the tangential speed memorized in the planner as the trajectory model.
Next, the surface tracking control is formulated as the trajectory control which controls the motion of the tip of end-effector of robot along a path specified on the object surface keeping its relative pose to the object's surface and tangential speed constant. The path is given as the intersection of the undefined object's surface and an appropriate constraint surface. To realize such system, the nominal trajectory is deduced from the geometrical information of an undefined object's surface detected by the proximity sensor, a specified constraint surface and the tangential speed. Combining the principle of ATGS and the nominal trajectory generating algorithm, the surface tracking control system is obtained.
The validity and effectiveness of the proposed method is confirmed by the simulation results.抄録全体を表示PDF形式でダウンロード (861K) -
二宮 保, 中原 正俊, 原田 耕介1989 年 25 巻 3 号 p. 340-346
発行日: 1989/03/30
公開日: 2009/03/27
ジャーナル フリーAt the stage of designing switching converters, it is considerably important to optimize the dynamic characteristics, which impose the restriction on the choice of parameters such as the inductance of reactor, the capacitance of output capacitor and the feedback gain of control circuit, etc. For instance, the restriction for stability prevents the miniaturization of the converter because it increases the minimum capacitance of output capacitor, and also it reduces the range of available load current. From these reasons, the latitude of design is narrowly limited. To improve these problems there are some effective compensation methods available for dynamic characteristics such as proportional and differential control (PD control) and state feedback control composed of several control loops.
The purpose of this study is to compare PD cotrol which is popularly known as a compensation method and the state feedback control where not only the output voltage but also the reactor current are the feedback signals. The difference between them is made clear analytically and experimentally in terms of the compensation effect on the stability characteristics and the step response of output voltage. As a result, it is proved that by employing the state feedback control the capacitance of output capacitor is decreased half and the available load current is increased twice compared with those in case of the PD control. In addition the state feedback control is fairly insensitive to the ripple and noise and facile to design, whereas the PD control is not. Therefore the state feedback control is superior to the PD control as a whole.抄録全体を表示PDF形式でダウンロード (1424K) -
村田 年昭, 土谷 武士, 武田 郁夫1989 年 25 巻 3 号 p. 347-354
発行日: 1989/03/30
公開日: 2009/03/27
ジャーナル フリーIn this paper, a new synthesis method for an efficiency optimized induction machine speed control system is proposed. Until now, the potential for energy saving in variable frequency induction motor drives has been demonstrated, and the control strategy yielding a reduction in losses have been analyzed. In these methods, losses analysis depend upon the T-type equivalent circuit using the root mean square values. The combination of stator voltage and frequency minimizing the induction motor losses was shown to be a complex function of the operating speed and torque. In this paper, the losses are estimated by an equivalent circuit in α-β axes at synchronously rotating reference frame under steady state.
The controllable losses are described by the stator current proportional to torque and the current component in the direction of the rotor linkage flux. The optimal ratio of these currents for minimizing the controllable losses under a given output is analytically derived.
The efficiency optimization is established by controlling the current ratio to be optimal. The efficiency optimized speed control system which attains maximum efficiency, vector control and zero steady state error for the desired signals simultaneously is proposed by an optimal regulator theory. Considerable improvment on the efficiency at the steady state and quick responses for the desired signal are obtained from simulation results of the efficiency-optimized speed control system.抄録全体を表示PDF形式でダウンロード (1050K) -
宇田川 一幸, 朝増 昭, 西山 博之1989 年 25 巻 3 号 p. 355-360
発行日: 1989/03/30
公開日: 2009/03/27
ジャーナル フリーIn this paper a study on an I-PD type decoupled control system applied to the configuration control of feedwater pumps of a boiling water reactor power plant is presented. The proposed control system has been designed based on partial model matching theory in a linear system with three inputs and three outputs.
This configuration control, for example from one pump operation to two pumps, needs a rapid and careful operation without causing a large change of water level of the reacter vessel, which is an important parameter in reactor core cooling, while pump flow rate should be more than minimum flow rate due to pump protection. Because of interference between the pararell running pumps, a conventional control system is not stable.
The result of computer simulation showed high performance of the proposed control system; a stable system, smaller peak value of reacter vessel water level change and shorter completion time than a conventional control.抄録全体を表示PDF形式でダウンロード (847K) -
呉 振勲1989 年 25 巻 3 号 p. 361-368
発行日: 1989/03/30
公開日: 2009/03/27
ジャーナル フリーIn the phosphoric acid fuel cell system, it is desirable to be operated at high temperature, because of temperature dependence of system efficiency. But it is regarded that high temperature of the cell above 200°C influences degradation of the electrode and the catalyst loaded on the cell. And also temperature of the cell and current density which is introduced from V-I characteristics are interdependent at the same time. Therefore, leveling off the temperature distribution on the cell is reality in practical fuel cell operation.
We studied two cases of fuel cell system in different flow direction of cooling air in counter flow, and present the calculation result in some conditions by changing the inlet coolant temperature, flow rate and the utilization of oxigen and hydrogen.抄録全体を表示PDF形式でダウンロード (964K) -
中森 義輝, 村崎 好則1989 年 25 巻 3 号 p. 369-376
発行日: 1989/03/30
公開日: 2009/03/27
ジャーナル フリーA heuristic algorithm for drawing visually understandable hierarchical directed graphs is presented. The algorithm finds an allocation of vertices on a circumference so that the number of crossings of arcs is as small as possible. Directed graphs considered are Hasse diagrams that represent partial orders. Especially, the skeleton digraph, that is the final production of the interpretive structural modeling, is taken into account. This research forms a part of the development of the interactive modeling support system that is a highly user-friendly computer software to develop large-scale system models, using statistical and graph-theoretical approaches cooperatively.抄録全体を表示PDF形式でダウンロード (1002K) -
片山 佳則, 戸田 光彦1989 年 25 巻 3 号 p. 377-384
発行日: 1989/03/30
公開日: 2009/03/27
ジャーナル フリーWe propose a support system for evaluating R & D projects. It focuses on technological propagation among projects, and supports experts' evaluative decisions on a group of projects. It provides a fundamental framework for knowledge processing, which we obtained through a case study. The framework consists of knowledge on technological effects for deriving the propagation of technology, and knowledge of category relations for extending the scope of propagation. We apply this system to R & D projects for energysaving technology, and present results for evaluating their benefits in terms of technological propagation. This system has supporting functions of two levels. In the basic level, it processes knowledge on technological effects and associated propagation rules, and integrates project information to construct extensive networks of technological propagation. In the extended level, the system additionally uses knowledge of category relations of technology. The knowledge contains that of technological transfer, and that of technological level transfer. They enable extending the above propagation rules, and provide system's functions for evaluating R & D projects. The fundamental framework and propagation rules proposed in this paper can not only be utilized for evaluating R & D projects, but also for developing knowledge base systems for other purposes.抄録全体を表示PDF形式でダウンロード (1273K)
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