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Volume 3 (1967)
- Issue 4 Pages 245-
- Issue 3 Pages 161-
- Issue 2 Pages 83-
- Issue 1 Pages 1-
Volume 3, Issue 2
Displaying 1-11 of 11 articles from this issue
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Experimental Transient Response for Reflux Flow-Rate ChangeYomei KATO1967 Volume 3 Issue 2 Pages 83-86
Published: June 30, 1967
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSExperimental transient response data are presented for a twenty one-tray, 320mm diameter, bubble cap distillation column when a sudden change in reflux flow-rate is introduced. The column operated with the water-methanol system. The experimental transient response curves are distinguished into two regions, one is a short time region immediately after a change in reflux flow-rate where the response is determined mainly by transfer lag of a liquid stream in the column, the other is a long time region after the above mentioned region where the response is determined mainly by mass transfer. The response by mass transfer has very significant nonlinearity for a reflux flow-rate increase and decrease.View full abstractDownload PDF (550K) -
The Analysis on Transient Response for a Change in Reflux Flow-RateYomei KATO1967 Volume 3 Issue 2 Pages 87-94
Published: June 30, 1967
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSA previously reported experimental transient response of binary system distillation column to change in reflux flow-rate has very significant nonlinearity for reflux flow-rate increase and decrease. In order to analyse this behavior, transient response is calculated with the digital model in which nonlinearity of equilibrium relation, dependency on liquid composition of flow-rate and liquid hold-up on a tray are considered. The calculated transient response and temperature distribution agreed with experimental, results therefore the validity of the digital model described in this. paper is confirmed.View full abstractDownload PDF (960K) -
Tetsuro SUZUKI, Yoshinobu HARADA, Shigeru YAMADA1967 Volume 3 Issue 2 Pages 95-102
Published: June 30, 1967
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSThe present paper concerns with the detail and the experimental result of a road traffic simulator constructed to obtain the quantitative relation between the traffic flow and its regulating elements such as intersection and signal on a highway or a city road. In the simulator the number of cars passing on roads is represented by electrical pulses in the circuit, and a number of stored pulses and a delay time of pulses are interpreted as corresponding to a waiting queue and time at a intersection.
In the measurement the pulse distance, the phase split and the signal off-set time are taken to be the variable parameters. The set of parameters which gives the maximum number of pulses passing through the circuit in a unit time is analysed in terms of the actual traffic flow. For convenience the pulse width is kept constant and the pulses are placed periodically. The waiting queue and time are measured by a cathode ray oscilloscope.
As an example the optimal off-set time for the minimum waiting queue was measured for the both directions of two intersections. The result shows that the optimal off-set time is sensitive to the ratio of the traffic flows in the both directions. The case of three intersections was also considered.
The discussion was made for the relation of a off-set time and a phase split to a waiting queue and a traffic volume.View full abstractDownload PDF (1100K) -
Ken ITO1967 Volume 3 Issue 2 Pages 103-112
Published: June 30, 1967
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSAt first, the auther made clear the relation between the torque and the speed, and between the torque and the throttle opening of engine. This theoretical analysis of the torque introduces an equations of engine characteristics matched with a load.
Next, the results of this theoretical analysis are compared with experimental data obtained from transient response tests of engine behavior, which matched with the dynamometer.
As the result, it was proved that the exprimental data coincides with the theoretical values. satisfactorily.
Therefore, the analysis may be used to improve the performance of the engine with a load.View full abstractDownload PDF (1215K) -
Ken ITO1967 Volume 3 Issue 2 Pages 113-121
Published: June 30, 1967
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSThis paper presents the dynamic characteristics of the Junkers-type hydraulic dynamometer which is used for the performance test of prime movers, such as gasoline engines.
It is well known that the Junkers-type dynamometer has not only a simple construction but low inertia rotational parts. So it is suited to the performance test of high speed movers.
In this paper, the author analyzes characteristics of the hydraulic dynamometer referred to its absorption-torque and he evidences the nonlinear characteristics of hydraulic dynamometer.
The result of this theoretical analysis fairly well coincides with that of experimental result. Therefore, theoretical analysis may be used to synthesis of the speed regulater for dynamometer.View full abstractDownload PDF (1186K) -
Tsugumasa SUTO, Tsutomu YOKOZUKA1967 Volume 3 Issue 2 Pages 122-128
Published: June 30, 1967
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSCharacteristics of 2-phase servomotors can be analyzed by the use of an equivalent circuit. The method for measuring equivalent circuits is based on zero speed tests and synchronous speed tests, that is, measuring the input impedance, first with the rotor locked, and then with the rotor circuit open. In the former measurements, the secondary voltage must be kept constant considering saturation of the core. By additionally measuring the input power at zero speed and the d-c resistance, it is possible to determine the equivalent-circuit constants with the aid of the nomograph in which the relationship between measured values and circuit constants are expressed graphically.
To check the accuracy of the above method, we compute various characteristics and compare with the measured results. This method of obtaining equivalent-circuit constants was found useful, and computed results are sufficiently accurate.View full abstractDownload PDF (877K) -
Hiroshi KAWARADA1967 Volume 3 Issue 2 Pages 129-134
Published: June 30, 1967
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSThe randomness of a binary random number sequence shall be quantitatively defined by the entropy per tuple of the binary random number sequence.
This paper presents an entropy measuring device and a generator, which is constructed by combining M-sequence with noise, of high-speed binary random numbers. The randomness of the binary random number sequence is measured and the statistical mechanism of the generation of binary random numbers is investigated.
Experimental results show that the decrease of randomness results from the high-speed of generation of binary random numbers. However, it has become clear that the speed of binary random number sequence can be made higher without loss of its randomness only by making the speed of generation of M-sequence higher. The relation between frequency and randomness (entropy per tuple) of the binary random numbers described in this paper is as follows:
frequency 30kc/s 60kc/s 120kc/s 240kc/srandomness 0.999 0.999 0.993 0.735View full abstractDownload PDF (762K) -
Yoshifumi OKUYAMA1967 Volume 3 Issue 2 Pages 135-141
Published: June 30, 1967
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSLinear systems with randomly time varying parameters which are stationary stochastic process (stationary random process), have been investigated for many years by Rosenbloom, Samuels, Bertram, Bergen, Bershad and others.
This paper is intended to extend the works by Rosenbloom and to develop the idea of Bershad. It is now considered that the linear systems are represented by generalized state equations using linear operator matrix. The system stability, in stochastic sense, is determined by examining whether or not the 2nd moments of the corresponding state variables are bounded. All of the random parameters are assumed to be Gaussian and non-white process. Two theorems of the 2nd moment stability are derived. Especially, latter theorem, relating to partially disturbed systems, gives a practical sufficient condition for the stochastic stability of such a system. Simple illustrative examples are also presented.View full abstractDownload PDF (729K) -
Yoo YONEZAWA, Tsuyoshi GOROMARU1967 Volume 3 Issue 2 Pages 142-148
Published: June 30, 1967
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSIn on-off control systems, it is well known that desirable characteristics may be obtained by proper design of the feedback-compensator. In many of the studies in this field the validity of theoretical results has been confirmed by use of analog computer.
In this study the authors made a thermal process and a dead time element for on-off signal, which are the controlled system of on-off control with feedback-compensation. The effects of system parameters on the dynamic response and the optimum settings of adjustable parameters are experimentally investigated.
As an experimental result, it is found that the validity of the theory about on-off control system with feedback-compensation is evident, the response of on-off control is improved by the feedback-compensator, and the effects on the amplitude of the limit cycle due to the width of hysteresis in on-off control element and the value of dead time in controlled system are greatly weakened by the optimally set feedback-compensation.View full abstractDownload PDF (816K) -
Koji NEZU, Jitsuo OKADA1967 Volume 3 Issue 2 Pages 149-152
Published: June 30, 1967
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSAn automatic two wavelength pyrometer without a drift was achieved by using zero method The application of zero method permits the use of photosensors whose stability in spectral responses is rather poor.
A feedback system including two variables was newly developed for this instrument. In order to detect the differences between object and reference lights at two wavelengths, the instrument is equipped with a rotating mirror which guides object and reference radiations alternately to a pair of photosensors, one for a short wavelength and the other for a long wavelength.
The output of the former photosensor is used to suit the color temperature of a reference radiator to that of the object, because the brightness at shorter wavelengths is generally sensitive to changes in the color temperature of radiators. On the other hand, the output of the latter photosensor controls an optical wedge adjusting the radiant energy from the reference radiator to that from the object.
A prototype pyrometer using PbS as photosensors was calibrated by a standard black body furnace, and it was proved that the operational range was between 400°C and 900°C with the reproducibility of as good as ±5 deg and the response time was 1.5 second.View full abstractDownload PDF (1057K) -
Hiroshi TAMURA, Takao KUROKAWA1967 Volume 3 Issue 2 Pages 153-160
Published: June 30, 1967
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSRealization of multi-dimensional separating surfaces is one of the current problems in the field of time-optimal control as well as in the field of pattern classification. Some structures of a multi-dimensional function generator which can be employed in pattern-classifying problems and optimal control problems are proposed in this paper. The function generators are composed of two kinds of threshold elements, relay and limiter element. A 2-layered network of threshold elements is useful to generate a function which can be expressed by a sum of nonlinear functions of a linear combination of input variables. Functions of more general form can be generated by dividing the variable space into many convex regions and assigning a hyperplane to each region. In this method, analog AND and analog OR operations are necessary to connect those hyperplanes. Furthermore, the number of threshold elements required to realize a function can be diminished, if the information about convexity of the function is available. The number of threshold elements required to realize an n-dimensional function is also given in this paper.View full abstractDownload PDF (1021K)
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