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Volume 4 (1968)
- Issue 4 Pages 313-
- Issue 3 Pages 213-
- Issue 2 Pages 99-
- Issue 1 Pages 1-
Volume 4, Issue 2
Displaying 1-15 of 15 articles from this issue
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Hajime YAMADA1968 Volume 4 Issue 2 Pages 99-106
Published: June 30, 1968
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSDifferential transformer forms a open magnetic circuit with cylindrical rod, the magnetic flux along the rod becomes non-uniform distribution, because demagnetizing force exists. In analyzing such leakage magnetic path, sometimes method which observes the flux distribution along the rod gives a better physical interpretation of the phenomenon than observes permeance of the air magnetic path.
In this paper, from the above point of view, the circuit parameters, which are inductances and coefficients of coupling, are derived from the average flux along real winding axis of the transformer. Using this method with the aid of these circuit parameters, it is possible to odtain the performance theory of the transformer. The analytical method described in this paper is able to explain the influences of winding constructions, rod materials and dimensions, because the all circuit parameters are shown by the flux.View full abstractDownload PDF (1004K) -
Kokich NITTA, Hiroshi OKITSU, Shun-ichiro OE1968 Volume 4 Issue 2 Pages 107-111
Published: June 30, 1968
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSRecently, miscellaneous function generators using skillfully the characteristics of the semiconductors have been developed and the simulations of non-linear characteristics existing in the physical phenomena are developed in respect of easiness and accuracy.
However there are few instances applying the thyristor to the function generators, which are developed in the field of the electric power.
Now we tried to use the thyristors as an analogue element, and make the function generators for trial using them and investigated their applications.
Especially we applied the saw-tooth wave oscillator using thyristor and integrator to the measurement of the speed of rotating machines and favorable results are obtained.
Up to now, miscellaneous digital tachometers have been used for the measurement of steady state revolutions, but there are no satisfactory means for measurement of the changing speed, except the use of DC or AC tachometer generator connected directly to the rotating machines.
In this paper the measuring method using saw-tooth wave oscillator consists of thyristor and integrator are described. In this method, firing signal for the thyristor are received optically or electromagnetically from the rotating machines.View full abstractDownload PDF (1985K) -
Kazushige UMEZAWA, Masayuki SUZUKI, Ichiro SUGIURA1968 Volume 4 Issue 2 Pages 112-120
Published: June 30, 1968
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSA method of optimization is studied by using the Maximum Principle technique in which the plant parameters are treated as additional state variables that are constant but unknown in advance in defined time region. The transversality conditions on some manifolds formed by initial or final conditions and parameter constraints can give necessary conditions for the optimal parameters. The necessary conditions are derived in the following three cases.
1) plant parameters have some equality constraints.
2) the magnitudes of plant parameters are bounded.
3) or perfectly arbitrary.
Several examples and an appication to an interacting control system are disscussed to optimize their free parameter values.View full abstractDownload PDF (1103K) -
Nobuo HAYASHI1968 Volume 4 Issue 2 Pages 121-126
Published: June 30, 1968
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSIn this paper (when the input random vector consists of mutually correlated components or subvectors), techniques of the correlation analysis for a multivariate system are discussed. A multidimensional linear algebraic equation having a matrix of comparably high order can be derived.
In the case of the multivariate system, the correlation techniques may be used as in the univariate system. But there are few papers treating the case generally when the input random vector of the multivariate system has mutually correlated components or subvectors.
It is shown that the correlation techniques for univariate systems is generalized to the case of the multivariate system, and that the equations to estimate impulse responses of the system should be quite analogous to the normal equation of the regression analysis. From this result, the method estimating the accuracy of calculated impulse response functions are presented by applying some techniques of multivariate statistical analysis. It is especially pointed out that the techniques of simultaneous confidence interval estimation on regression coefficients are useful to estimate the impulse response functions.View full abstractDownload PDF (925K) -
Takao OUCHI, Mitsunori FUKUJU1968 Volume 4 Issue 2 Pages 127-134
Published: June 30, 1968
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSThis paper describes a method of measuring the comparatively short response time of DC motor. It is measured by the means that the number of half-cycle period from the moment when the step input is applied to this armature terminal to achieve the point of intensity modulation which is set up on the firing angle of magnetic amplifier, and the number of half-cycle period can be looked directly on the cathode-ray oscilloscope as the repeated transient phenomenon.
The transient response is investigated analytically, in case of the step input of DC voltage is applied to the armature terminals, and an analysis is extended to the method of measuring the response time in case of the ripple of 50c/s or more higher (sinusoidal) frequency is superposed on this transient response.View full abstractDownload PDF (2052K) -
Kin-ichi KOMIYA, Keiichi NAGASHIO1968 Volume 4 Issue 2 Pages 135-142
Published: June 30, 1968
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSIn this paper, cylinder nozzles for low Reynolds mumber flow are dealt. The form of the device is very simple and only a circular sectional flow conduit is interposed among pipes as a restriction.
It is evident that the device confers a benefit upon measurement of small size pipe flow. As the first step of the research, the relations among the restriction diameter d, nozzle length l, and flow coefficient α, are found in the case of air flow. As the result of this experiment, it is shown that the flow coefficients of the cylinder nozzle which has the length l as long as 2 or 3 times the diameter d, remains constant for wide range of Reynolds number.
According to those results, an optimum relation between l and d is decided as l/d=3 and the flow coefficients are determined. These experiments are made with air and carbon-dioxide flow under the condition of the pipe diameter is 20.0mm, diameter ratio β is 0.200, 0.400, 0.600, 0.700, or 0.800, and the range of Reynolds number is about 2·103∼10·103. The experimental arrangements are shown in detail and the measurement accuracies of each instrument are discussed. Pressure distribution along the wall of cylinder nozzle and both the upstream and the downstream of the pipe are also measured.View full abstractDownload PDF (1402K) -
Kazuyuki HOTTA, Hiroyuki OZOE, Koichi IINOYA1968 Volume 4 Issue 2 Pages 143-149
Published: June 30, 1968
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSIn the so-called Paynter-Takahashi method, or in the moment method to make the dynamic model Maclaurin expansion of the system transfer function is used for evaluating the model parameters. However, it is often difficult to get the accurate determination of the co-efficients of expansion by the experiments under the influence of the drift in the response data.
As a counter-measure to this difficulty, use of Taylor expansion around a point s=σ, with σ real and positive, is found very effective to improve the accuracy of the resulting model in a wider frequency range.
In this report, this new model forming technique, that is a generalized moment method, is discussed in detail. Effort is especially focussed on the establishment of a routine technique through which the most adequate value of the σ is always obtained, irrespective of the nature of the system tested and the conditions of the dynamic response experiment.View full abstractDownload PDF (992K) -
Shuntetsu MATSUMOTO1968 Volume 4 Issue 2 Pages 150-157
Published: June 30, 1968
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSThis paper is concerned with a A-D converting circuit which consists of a detecting circuit using parametron and either electric conductors or ferromagnetic material arranged along the moving axis of a specified mechanical element. This A-D converting circuit can be used to convert mechanical quantities (displacement, position, rotating angle and so on) of the mechanical element into the digital signal using jumping phenomena of the oscillating phase of the parametron.
Two parametron circuits are added to increase the flexibility for the information processing of the digital signal converted through this A-D converting circuit. One of these circuits is an eliminating circuit of the internal noise of the parametron and the other is a discriminating circuit of the moving directions of the mechanical element. The operation of these circuits is achived by setting and resetting parametronized memorial circuits through detecting circuits using parametron.
From the experiments on this converting circuit, the following necessary conditions to stabilize the converting operation are clarified: the changing cycle of the reactance component in the sensing circuit must be larger than twice the keying cycle of the parametron and the changing ratio must be at least 0.1%.View full abstractDownload PDF (4316K) -
Ichiro SUGIURA, Teiichi NARUSE1968 Volume 4 Issue 2 Pages 158-166
Published: June 30, 1968
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSFor certain control systems, it is necessary to readjust some instruments in the closed loop circuit periodically. In this case, a sampling control system in which the plant is controlled continuously by the PI(D) controller at the interval (T-h) and controlled by the hold element at the other interval (h) as shown Fig. 1 and 2, must be investigated.
Corresponding to the system performance index Q which is given as the integral of squared error, this report graphically gives the functional relationship of Q to the system parameters, (T-h)/T, L (plant dead time), kc and Tc (controller's gain and integral time) by using analogcomputation. Fig. 5∼Fig. 7 are the main results of this report and give contour lines of Q with respect to the above mentioned parameters.
By using these graphs, the proposed system can be synthesized almost perfectly in the case of T/Tp (Tp is the plant time constant) is equal and nearly equal to 1/10. In addition, Fig. 8 shows that there are interesting cases in which the proposed system is superior to the continuous control system.View full abstractDownload PDF (1767K) -
Tsugumasa SUTO, Tsutomu YOKOZUKA1968 Volume 4 Issue 2 Pages 167-174
Published: June 30, 1968
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSOwing to various lacks of symmetry and homogeneity in the tachometer, a zero-speed or residual voltage usually appears. As the current distribution is distorted by the dis-symmetry or the in-homogeneity in the rotor, the residual voltage is changed by the rotor position. The distorted current distribution can be easily analyzed by the use of compensation theorem.
The analyses are carried out to show how the dissymmetries and the inhomogeneities [(1) the inhomogeneities in the rotor conductor. (2) the distribution or position of inhomogeneities. (3) in the form of an out-of-round rotor] have influence on the variation of the residual voltage, and are compared with the experimental results. The result which is obtained in this way is very useful for the tachometer design and its manufacture.View full abstractDownload PDF (1141K) -
Yutaka SUZUKI, Tadayoshi FURUYA, Katsuhiko FUJII1968 Volume 4 Issue 2 Pages 175-181
Published: June 30, 1968
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSThe method of the estimation of the dynamic characteristics of a process by using the least square error criterion from the normal operating data and some estimation results of actual process by this method are reported in previous papers. Through a series of these practical approaches, it is recognized that the application of suitable techniques for data handling is no less important than the theoretical background of estimation procedures.
In this paper, several problems accompanied with data handling are pointed out, and some techniques to solve these problems are explained. The idea implied there is to introduce the filter with some specified characteristics in order to eliminate the unnecessary noise component in data. It is shown that using these techniques makes it possible to shorten the duration of recording, decrease the number of parameters to be estimated, and eliminate the drift component.View full abstractDownload PDF (5920K) -
Masao ITOH1968 Volume 4 Issue 2 Pages 182-187
Published: June 30, 1968
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSIn a feed-back control system, which is composed of two servo controllers and a controlled system of two inputs and two outputs with mutual interaction, it is necessary to investigate gains and parameters for compensating elements of each controller considering mutual relationship of two channels.
In this paper, when the open-loop forward gains of each channel are large for an ordinary servo control system, modifying and re-arranging the characteristic equations of the system, it shows that the system with mutual interaction could be treated approximately as separate equivalent circuits and the characteristics of the system could be easily obtained by the sample of calculation and diagrams of their root loci. In addition, the relationship in multi-channel system is discussed.View full abstractDownload PDF (552K) -
Wataru TATEBE, Nobuo MIYAMICHI, Shigeru OKUDA1968 Volume 4 Issue 2 Pages 188-195
Published: June 30, 1968
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSIn recent years, demodulating compensators have been used occasionally as stabilizing networks in the all AC servomechanism. Since the compensation obtained by the use of demodulating compensator is independent of carrier frequency variation, such a compensating network is superior to the bridged-T or parallel-T networks that are commonly used for stabilizing purpose in the AC carrier control system. The effect of demodulating compensator in the AC carrier control system can be considerably simplified by the substitution of an equivalent DC network. However, the main disadvantage of the usual demodulating compensator is noise output in the form of quadrature component of the carrier.
In this paper, the symmetric phase-lead demodulating compensators which have the small values of the quadrature component are presented, and the performance of these compensators are analyzed. In addition, an example that serves to illustrate the use of the method is presented, and the usefulness of symmetric phase-lead demodulating compensators is recognized by the experimental data describing the actual response of the system.View full abstractDownload PDF (2470K) -
Fujio NISHIDA, Seiichi MIZUNO1968 Volume 4 Issue 2 Pages 196-202
Published: June 30, 1968
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSMany sampled-data controllers based on various principles have been developed and reported during the last ten years. Most of them belong to the analogue type. From the economical viewpoint, they are more advantageous in smaller-scale control systems than those of digital type. While, in large-scale systems having many control systems, the merits of the analogue type controller would be lost, because many analogue-memory units will be requied.
On the other hand, some digital controllers that have been reported belong to the stored program system. But, for the function of a general purpose computer, the computation and its control sequence in the usual sampled-data control are too simple and repetitious, and its routine is fixed. In this paper, a simple sequential digital type controller is presented and the trial production made in our laboratory is reported. The magnetostrictive delay line, the binary rate multiplier, the revercible counter and the sequential operation control unit are treated as the important factors. In addition several methods of linking the above controller with a superviser computer are considered, as well as several methods of using it as a controller of multi-point control systems.View full abstractDownload PDF (1684K) -
Proportionality of the Lever Sensitivity Used as Wire FulcrumRyuichi MASUO, Tadashi MIHUNE1968 Volume 4 Issue 2 Pages 203-208
Published: June 30, 1968
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSBy making an analysis of the proportionality between the load and the tilt angle of the lever of a balance provided with an elastic fulcrum, it is clarified that the maximum value of deviation from the linearity is raised to about the second power in proportion to the magnitude of this tilt angle.
If the lever is balanced previously with an appropriate moment given to the lever which is caused by the spring rigidity of fulcrum, the maximum deviation becomes about one half of what the usual method has brought about, resulting in the improvement in the proportionality.
These facts have been experimentally confirmed with a balance in which a wire fulcrum is used as the elastic fulcrum.View full abstractDownload PDF (1249K)
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