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Volume 19, Issue 2
Displaying 1-15 of 15 articles from this issue
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Nobuaki KOBAYASHI, Takayoshi NAKAMIZO1983 Volume 19 Issue 2 Pages 97-103
Published: February 28, 1983
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSThis paper deals with the design problem of the stable multivariable system decopled by a state feedback together with a dynamic compensator. First some properties of the dynamic compensator of minimal order for decoupling are investigated, and then the condition is derived for the decoupled system with a dynamic compensator to be stable. Next it is shown that the decoupled system obtained by using both Silverman's method and Howze & Peason's method automatically not only satisfies the stability condition, but also contains a minimal order dynamic compensator. Finally the present analysis is extendend to the decoupling problem of a linear m-inputs r-outputs system, and the design procedure of the stable, decoupled system with a lower order dynamic compensator is described with a numerical example.View full abstractDownload PDF (858K) -
Kazuo MUROTA1983 Volume 19 Issue 2 Pages 104-109
Published: February 28, 1983
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSStructural controllability is studied for a system described in the following form with auxiliary variable w: x=A1x+B1u+C1w and w=A2x+B2u+C2w, where the nonzero entries of the coeffiicient matrices Ai, Bi, Ci (i=1 2) are taken for independent parameters. This setting reflects the physical consideration that the entries of the coefficient matrices A and B of the reduced form x=Ax+Bu, which is obtained by eliminating w above, are usually subject to algebraic constraints and do not represent independent elemental physical parameters. A necessary and sufficient condition, which is a natural extension of the presently known results, for the structural controllability is given in terms of graph-theoretic conditions. Specifically, in terms of a directed graph G with nodes corresponding to variables xi, ui and wi and with arcs to the nonzero entries of matrices Ai, Bi and Ci (i=1, 2), the controllability of the nonzero modes is shown to be equivalent to the condition that each node xi is accessible from some node uj by a directed path on G.View full abstractDownload PDF (844K) -
Yoichi HAYASHI, Yoshiaki OHTAKE, Naonori NISHIDA1983 Volume 19 Issue 2 Pages 110-117
Published: February 28, 1983
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSA number of important problems can be represented as dynamic (time-expanded) network flow problems. A dynamic network is a network whose arcs not only have a capacity but also a traverse time and whose flow units travel through time in a dynamic network.
Minieka has presented an algorithm based on Ford and Fulkerson maximal dynamic flow algorithm that costructs a maximal dynamic flow with a latest departure schedule and an earliest arrival schedule.
In the present paper, we generalize the lexicographic dynamic flow treated by Minieka to be able to deal with more important and practical dynamic network flow problems.
First, we show how efficiently to construct the time-expanded network from an original network and formulate a lexicographically-optimal dynamic flow problem. The problem is to find a maximal dynamic flow which has the departure distribution at the source and the arrival distribution at the sink as proportional to the given weights at each time with respect to a source and a sink as possible.
Secondly, we consider the problem of finding a dynamic flow which has the minimum cost among all lexicographically-optimal dynamic flows with respect to a given weight vector.
This problem is further extended to a problem of finding a dynamic flow with desired distribution of departures and arrivals, in which the weight vector is determined so that the minimum cost of the dynamic network is attained within the admissible region of the weight vector.
Algorithms for solving these newly formulated dynamic network flow problems are proposed. An illustrative example is also shown to demonstrate the behavior of the algorithms.View full abstractDownload PDF (1131K) -
Shinji HARA, Nobuaki KOBAYASHI1983 Volume 19 Issue 2 Pages 118-123
Published: February 28, 1983
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSUndershooting phenomena in step responses are undesirable for almost all servo systems. This paper is concerned with design conditions and design procedures of multivariable servo systems satisfying the following three conditions: i) internal stability, ii) output regulation, and iii) no undershooting phenomena of type A. The sufficient conditions and the procedures of constructing such servo systems by state feedback and by dynamic compensator are presented. If the number of the inputs of the plant is not less than that of the outputs and the plant has no invariant zeros, such servo systems can be realized by appropriate dynamic compensators. Design procedures with lower-order compensators are also proposed.View full abstractDownload PDF (796K) -
ShaoYin YAN, Norihiko ADACHI, Hidekatsu TOKUMARU1983 Volume 19 Issue 2 Pages 124-129
Published: February 28, 1983
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSIn this paper, a method to design a finite time setting adaptive obsever for multi-input multi-output linear systems is discussed. The scheme proposed is based on a canonical state-space representation for multivariable systems, which is obtained from a matrix difference operator representation of linear time-invariant systems. The algorithm for parameters and states estimation is derived from a sequential algorithm to obtain the minimum-norm least square solution of linear algebraic equation: AX=Y, with pseudoinverse. A simple example is given to show the effectiveness of the algorithm presented.View full abstractDownload PDF (581K) -
Yo ISHIZUKA, Kiyotaka SHIMIZU1983 Volume 19 Issue 2 Pages 130-137
Published: February 28, 1983
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSWe study necessary conditions for an optimization problem with the objective and constraint functions including extreme functions. The extreme function is a function which is defined by max or min operations with respect to the opponent's variable, and hence it is a non-differentiable function in general. So, we are concerned with the optimization problems with non-differentiable objective and constraint functions.
We present a new approach to the necessary conditions for non-differentiable optimization problems by means of generalized Farkas' lemma, and also, as an application, deal with optimality conditions for the optimization problem mentioned above.
At the start, the necessary conditions are described by a system of inequalities with general directional derivatives of objective and constraint functions. Then we apply the generalized Farkas' lemma to the system of inequalities to obtain the Kuhn-Tucker type conditions. We also present the chain-rule of directional derivatives.View full abstractDownload PDF (994K) -
Masumi ISHIKAWA, Yoichi KAYA1983 Volume 19 Issue 2 Pages 138-143
Published: February 28, 1983
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSGiving judgemental probability to a non-recurrent event, which is frequently demanded in the field of technological forecasting, is not an easy task. To lessen this difficulty, the present paper proposes to give judgemental probability in two stages: representing the likelihood of occurrence of an event in a linguistic form, i.e. a probabilistic statement, and then converting it to numerical probability with the help of the a priori constructed relationship between probabilistic statements and objective probabilities.
Major problems in constructing this relationship are how to select suitable probabilistic statements and how to scale these. The ranking method based on paired comparison data developed by the authors is adaptable to these problems. For selecting probabilistic statements rank order of statements is obtained for each subject. Those statements for which fuzziness and variance among subjects are large are discarded from consideration. For scaling the remaining probabilistic statements rank order of these statements and objective probabilities is obtained for a group of subjects.
The previous selection procedure applied to 14 probabilistic statements discards 6 statements as being unsuitable based on the paired comparison data of 8 subjects. This method also clarifies the number of distinguishable statements; it varies from 3 to 8 and averages 5 for probability greater than 0.5. Based on the rank order of the remaining 8 statements and 8 objective probabilities for a group of subjects, 5 probabilistic statements are finally selected as possessing desirable characteristics. Applications of the present approach to various case studies in technological forecasting have gained a favorable support of the experts.View full abstractDownload PDF (839K) -
Yajiro MORITA, Yuzo OKA, Haruo NIWAYA1983 Volume 19 Issue 2 Pages 144-150
Published: February 28, 1983
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSThis paper deals with the classification of a set of objects assuming that the transitivity of order relationship may not hold in measuring and evaluating objects of the real world. An analysis of intransitively ordered set has derived the concepts such as the extended fundamental pattern, the pseudo-interval order and so forth to understand the intransitively ordered set. The set can be divided into subsets by using the above mentioned concepts. But it is not yet known whether we can develop a systematic algorithm of classification. This paper proposes an heuristic algorithm classifying the intransitively ordered set into as many subsets as possible.View full abstractDownload PDF (904K) -
Takao HINAMOTO, Mitsuji MUNEYASU, Sadao MAEKAWA1983 Volume 19 Issue 2 Pages 151-157
Published: February 28, 1983
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSIn this paper a procedure is developed for the spatial-domain design of two-dimensional recursive digital filters having separable denominator. The designed digital filter gives the best approximation, in least squares sense, to desired two-dimensional Markov parameters over a finite interval. In the design the digital filter is expressed by a canonical-form statespace model and the conjugate gradient method proposed by Davidon, Fletcher, and Powell is used to optimize a performance index. Since the resulting filter has a separable denominator, it is easy to check the stability. Finally two examples are solved to illustrate the proposed technique.View full abstractDownload PDF (900K) -
Katsutoshi SATO, Kesao MIYAHARA, Hiroshi HATANAKA1983 Volume 19 Issue 2 Pages 158-163
Published: February 28, 1983
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSThis paper deals with the effect of the pressure sensing orifice-cavity ensemble (PSOCE) on the transfer characterstics of the pneumatic transmission line. The following results are obtained. (1) When the pressure transfer gain characteristics of a pneumatic rectangular line terminated with a long line are measured by the cavity mounted transducers, they vary sinusoidally and do not coincide with those measured by the flush mounted transducers. (2) The amplitude of the gain variation depends on the input pressure amplitude, the diameter and the length of the pressure sensing orifice, and the volume of the pressure sensing cavity. (3) The period of the gain variation depends mainly on the input-output distance of the test line. (4) The PSOCE of a large diameter and short length orifice and of a small volume cavity should be used to minimize the PSOCE effects. (5) The theory taking account of the effects of these parameters has a good correlation with the experimental results.View full abstractDownload PDF (801K) -
Toshi TAKAMORI, Toshio INOUE, Masatada YONEMOCHI1983 Volume 19 Issue 2 Pages 164-169
Published: February 28, 1983
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSThe noise nuisance caused by cars has recently attracted the mention of many peoples as one of the social problems arising alone with a sudden increase of car traffics in cities. To reduce the noises, “reactance mufflers” in which the acoustic energy is reserved, are the most useful to internal combustion engines because of a good durability on heats and contaminations by combustion. Until now, various kinds of “reactance mufflers” have been designed, but it is unfortunate that these methods seem to be ineffective in the systematic design.
In this study, an expansion chamber muffler, one of the simplest reactance mufflers, is systematically designed by using the fluid network theory which we have already presented.
The advantages of this design method are as follows;
1) The calculation is relatively easy.
2) The effects of the internal resistance of engine and the outlet load resistance of muffler can be considered.
3) The attenuation poles can be made at desirable frequencies.View full abstractDownload PDF (701K) -
Yoichi OHIRA, Toshimasa KAWANISHI1983 Volume 19 Issue 2 Pages 170-175
Published: February 28, 1983
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSLinear induction motors (hereafter, referred to as LIM) have large start-up thrust, and can be accelerated or retarded largely. The system can be made into light weight, accordingly, the maintenance becomes easy.
Also they have advantages such as low noise, and are used for the purpose requiring long stroke function from medium speed to high speed.
Thus, they contribute largely to industries.
As the range of their application expands hereafter, not only the one-dimensional drive but also the demand for those which enables the two-dimensional drive will increase. However at present, the device which realized the two-dimensional drive with only one LIM has not been found as far as the authors knows, and the only method is to use by combining several existing LIMs. But by the method like this, since the mechanism is complicated, the control and maintenance are relatively troublesome.
For the purpose of improving the point described above, the authors made the device generating thrust simultaneously in bi-directions (hereafter, referred to as bi-directional LIM) for trial, and carried out the fundamental experiment, therefore, it is reported in this paper.
Besides, in the bi-directional LIM, the primary windings are arranged on an iron core along two horizontal, perpendicularly intersecting axes as shown in Figures 1, and two-dimensional moving magnetic field is generated, thus, it can drive the moving part in any direction.
As the applications, the part selecting carrying direction at the branching point in transport, the part selecting recovering direction in non-ferrous metal recovery facility and the device giving motion in any direction as a no-contact electromagnetic shuttle seem to be feasible.View full abstractDownload PDF (1767K) -
Tsutomu MITA1983 Volume 19 Issue 2 Pages 176-178
Published: February 28, 1983
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSDownload PDF (254K) -
Junya SHIMAZAKI1983 Volume 19 Issue 2 Pages 179-181
Published: February 28, 1983
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSDownload PDF (360K) -
Junya SHIMAZAKI1983 Volume 19 Issue 2 Pages 182-184
Published: February 28, 1983
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSDownload PDF (333K)
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