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Volume 19, Issue 9
Displaying 1-16 of 16 articles from this issue
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Kazuo MUROTA1983 Volume 19 Issue 9 Pages 683-690
Published: September 30, 1983
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSStructural controllability is studied for a system described in the form with auxiliary variable w:
Fx=A1x+B1u+C1w, 0=A2x+B2u+C2w,
where the nonzero entries of the coefficient matrices F, Ai, Bi, Ci (i=1, 2) are classified into two groups, one of which is the set of independent parameters and the other of which is the set of fixed elements; the structural controllability is defined as the generic controllability with respect to those independent parameters. Under a certain assumption based on physical considerations, a necessary and sufficient condition for the structural controllability is given. An efficient algorithm for testing it is also constructed with the aid of matroid-theoretic concepts.View full abstractDownload PDF (1077K) -
Shigeto NISHIDA, Masatoshi NAKAMURA1983 Volume 19 Issue 9 Pages 691-696
Published: September 30, 1983
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSMethods for approximating a complex system of high order to a model of low order are refered to as reduced-order modelings. One of the ways of obtaining such an approximate model is to disregard the eigenvalues of the original system which are farthest from the origin and retain only dominant eigenvalues. The Davison model and the Marshall model are renowned reduced-order models by dominant eigenvalue technique. A defect of these methods is that a steady-state value of these models does not coincide with that of the original system for polynomial inputs.
In this paper, we consider a dominant eigenvalue reduced-order model which eliminates this defect. First, we derive the reduced-order model which compensates for a steady-state value for polynomial inputs. This model is the same as the Davison model or the Marshall model for special inputs. Next, we prove that the steady-state value of the model coincides with that of the original system for polynomial inputs. Finally, we show that the model, which involves differential terms of the inputs, can be applied to a control problem by using the polynomial input suboptimal control method.View full abstractDownload PDF (753K) -
Yasushi AMANO, Katsutoshi TAMURA, Kunihiko ICHIKAWA1983 Volume 19 Issue 9 Pages 697-704
Published: September 30, 1983
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSThis paper presents a method of designing an indirect model reference adaptive control system for single-input single-output linear continuous plants. In the system, the adjustable parameters converge exponentially to their true values and the adaptive input signal can be simply generated.
A proof of the boundedness of all signals in the system is given. The property of exponential convergence of the adjustable parameters is used in the proof which is different from the previous works investigated in direct MRACS's.View full abstractDownload PDF (940K) -
Kiichiro TSUJI, Koichi ITO, Pyong Sik PAK, Yutaka SUZUKI1983 Volume 19 Issue 9 Pages 705-712
Published: September 30, 1983
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSWaste heat from factories and power generation stations can be regarded as one of the most important local energy sources that should be utilized nearby the site of waste heat sources. It is clear that there is a tradeoff between the amount of waste heat to be utilized and the cost for constructing a system to make this utilization possible. A detailed knowledge on this tradeoff is valuable when the proper location and the scale of this utilization system are to be determined over a region.
In this paper, we present a multiple objective optimization model in which the amount of utilized heat is to be maximized and the total capital cost for constructing the system is to be minimized. In this model, optimization is carried out in two-level hierarchy. That is, the entire distribution network is divided into primary and secondary networks and optimization is first carried out with respect to the secondary network. Then the resulting tradeoff curve for each secondary network is used in the optimization with respect to the primary network. The model is nonlinear reflecting the existence of economies of scale in capital cost and linear approximation is used to carry out the actual calculation. It is shown that the linearized problem has a special structure which makes it possible to determine an optimal solution directly. Thus, large scale, real problems can be solved without incurring too much computation.
A numerical example is presented, in which the usefulness of the calculated tradeoff curve is shown in detail.View full abstractDownload PDF (1087K) -
Takao KUROKAWA, Hideo ENOKI, Nobuyasu ITO1983 Volume 19 Issue 9 Pages 713-717
Published: September 30, 1983
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSIn this paper we propose a new interpolating method for ordered data points by means of a parabolic spline. In this new method, each segment-connecting node is located between two adjoining points. The parabolic spline with this node location can have higher flexibility than conventional one which has no inflexion except on the data points. A parabolic curve of each segment is parametrically expressed by ‘t’. And we can control its shape by changing the t-value when the spline passes through each data point. High curvature points are frequently selected as the feature points of a curve drawing because they have more information about the shape of an original curve as indicated by Attneave and others. In order to interpolate such feature points, a method is presented that maximizes the curvature of the parabolic spline at the data points. The proposed method is compared with cubic splines and circular arcs by applying them to examples of data point sequences and is shown to generate visually natural interpolating curves. It is also pointed out that these curves are similar to handdrawn interpolating curves.View full abstractDownload PDF (684K) -
Yuichiro HARA, Seiji INOKUCHI1983 Volume 19 Issue 9 Pages 718-723
Published: September 30, 1983
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSThis paper deals with an identification method of peak frequency in spectrum of periodic wave. The phase of complex spectral components changes by π at the peak frequency. The inverse of the spectral component along the direction of its phase angle is plotted on a linear function of frequency bin number. The peak frequency is determined by interpolating this function. Actually the estimation of peak frequency is influenced by the other significant peaks. In order to increase the accuracy of frequency identification, these peaks have to be suppressed. This paper proposes a method to suppress them by adding data, shifted and multiplied by a specified phase term, to original data.
Experimental results show that peak frequency can be accurately identified from a short-time complex spectrum and the frequency of a weak peak in the sidelobe of a high spectral peak can be identified by suppressing the high peak. And it is also shown through the experiment that a four-tone chord performed by a musical instrument can be identified correctly from a 256-point spectrum.View full abstractDownload PDF (740K) -
Shigeru NAGASAWA, Yutaka YOSHITANI1983 Volume 19 Issue 9 Pages 724-728
Published: September 30, 1983
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSFlexural orifices have several advantages over conventional rigid orifices, such as low pressure drop and linear characteristics between flow rate and pressure difference. However, these characteristics are affected by not only beam length but also flexural rigidity. Moreover, the discharge coefficient and orifice pressure distribution vary with pressure difference. As a result different techniques are required for flexural orifice design.
This report presented the studies of the static characteristics by numerical and experimental methods. Two methods of orifice design are proposed. One is by the use of experimental formulae, and the other uses CAD systems.View full abstractDownload PDF (1062K) -
Takashi MATSUI, Satoru HAYASHI1983 Volume 19 Issue 9 Pages 729-735
Published: September 30, 1983
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSOperating characteristic of a sonic oscillator using a load sensitive bistable amplifier is considerably affected by an output loading and becomes very complex as the result of interaction of the oscillatory phenomena in the sonic conduit and the output conduits.
In this paper, the effects of output loads consisting of long conduits and restrictors on the sonic oscillation are investigated theoretically and experimentally. In a mathematical model of the oscillator, the sonic loop conduit and the long output conduits are considered as distributed parameter elements. In the analysis, the describing function method are used because of a marked nonlinearity included in the characteristics of the bistable amplifier. A frequency equation of the oscillator is derived and the frequency variation according to the change of length of the sonic loop conduit and output conduits is discussed. Consequently, it is found that the deviation of the oscillation frequency from that of the sonic oscillator having no output conduits is remarkably influenced by the natural frequencies of the output loading. The theoretical results are in good agreement with the experimental ones.View full abstractDownload PDF (890K) -
Iwao YAMAMOTO1983 Volume 19 Issue 9 Pages 736-741
Published: September 30, 1983
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSDescribed in this paper, is a multivibrator, which can generate a continuous train of pneumatic square wave.
Two diaphragms are located in an enclosure which opens by an exhaust vent to the atmosphere. The centre of one of the diapharagms (feedback diaphragm) is a nozzle and faces the centre surface of the other (control diaphragm). The inside chamber of the feedback diaphragm is connected to the air supply chamber through an orifice provided in the fixed part of the diaphragm. The fluidic circuit which is composed of the nozzle, the orifice and the feedback diaphragm is so arranged to have bi-stable characteristics. A restrictor connects the supply chamber to the inside of the enclosure, and the feedback diaphragm chamber is also connected to the 3rd diaphragm chamber through an adjustable restrictor. A flate plane fixed on the 3rd diaphragm controls the flow-out area of the exhaust vent. Output wave is generated as follows.
First, when the supply pressure is introduced in the device, the nozzle contacts its counterface and the output pressure maintains a high level equal to the supply pressure. Then, the 3rd diaphragm pressure increases with a speed given by the resistance of the adjustable restrictor and the capacity in the 3rd diaphragm chamber. The enclosure pressure increases following to the increase of the vent resistance caused by the pressure change in the 3rd diaphragm chamber. When the enclosure pressure reaches a constant level, the nozzle separates abruptly from its counterface and the output pressure falls down to a low level. Then, the 3rd diaphragm pressure turns to decrease, and the enclosure pressure decreases following to the decrease of the vent resistance. When the enclosure pressure reaches to a low level, the nozzle contacts its counterface and the output pressure increases to the high level. The repeat of above process produces the pneumatic pulse train.View full abstractDownload PDF (942K) -
Yomei KATO, Hiroji MIKAWA1983 Volume 19 Issue 9 Pages 742-747
Published: September 30, 1983
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSThis paper presents a dynamic simulation model and the relation between operating condition and argon concentration of product gas for an air separation plant.
The conclusion drawn by the analysis are as follows:
(1) Even if the number of tray for argon column increases or decreases, concentration distribution near the top and the bottom is kept constant.
(2) The maximum concentration of argon is influenced considerably by nitrogen concentration of feed gas which is provided to the argon column.
(3) The argon concentration in the top portion of the argon column increases when a small amount of gas is discharged from there.
(4) The argon concentration of product gas decreases when argon flow rate from middle portion of the argon column increases.View full abstractDownload PDF (709K) -
Kiminori HISANAGA, Shin-ichi TAKAHASHI1983 Volume 19 Issue 9 Pages 748-749
Published: September 30, 1983
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSDownload PDF (264K) -
Katsushi MURAKAMI, Hideaki KANOH, Masami MASUBUCHI1983 Volume 19 Issue 9 Pages 750-752
Published: September 30, 1983
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSDownload PDF (412K) -
Shinji HARA, Fumihiro FUNAZAKI1983 Volume 19 Issue 9 Pages 753-755
Published: September 30, 1983
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSDownload PDF (377K) -
Masao TAKIZAWA, Nozomu HAMADA1983 Volume 19 Issue 9 Pages 756-758
Published: September 30, 1983
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSDownload PDF (295K) -
Noboru OHIRA, Tomiji HISAMURA1983 Volume 19 Issue 9 Pages 759-761
Published: September 30, 1983
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSDownload PDF (410K) -
Eiji TOBA, Yoshihiro NAKA, Masao SAWAJI1983 Volume 19 Issue 9 Pages 762-764
Published: September 30, 1983
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSDownload PDF (846K)
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