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Volume 4, Issue 1
Displaying 1-9 of 9 articles from this issue
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Noburo MINAMIZAWA1965 Volume 4 Issue 1 Pages 2-10
Published: January 10, 1965
Released on J-STAGE: November 26, 2009
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1965 Volume 4 Issue 1 Pages 11-21
Published: January 10, 1965
Released on J-STAGE: November 26, 2009
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Sunao YAMASHITA1965 Volume 4 Issue 1 Pages 22-29
Published: January 10, 1965
Released on J-STAGE: November 26, 2009
JOURNAL FREE ACCESSIn order to realize a flow control system with quick response, characteristics of the instruments of which the system is composed were analysed, and it was found that velocity saturation exists in the system because there is an upper limit to air flow which passes through a pilot relay. The system composed of a pilot relay and a control valve being analysed by the method of describing function, the following conclusion was obtained:
1) Pilot relay has a narrow linear zone and when input exceeds it, velocity saturation is born.
2) The system which includes velocity saturation is approximated pretty well to the first order lag, in which break frequency is shifted lower.
3) Analysis results obtained by the author nearly coincide with those by Takahashi, Ziegler and Nichols.
4) In an ordinary flow control systems loop gain is not so high that velocity saturation can not cause limit cycle.View full abstractDownload PDF (1082K) -
Bunjiro ICHIJO, Akira KAKIMOTO1965 Volume 4 Issue 1 Pages 30-37
Published: January 10, 1965
Released on J-STAGE: November 26, 2009
JOURNAL FREE ACCESSThis paper handles highly stabilized and highly sensitive frequency loss meter which has a deflection of 15μA/103MΩ at 2 Mc on a microammeter having a full scale range of 100μA. The zero drift is of the order of±2μA for 8 hours on a 100μA microammeter at the sensitivity of 15μA/102MΩ. This meter not only is built compact and is easy to adjust but also is free of line voltage fluctuation and temperature change, because a pair of resonant circuits automatically compensate these influences. This meter will surely be useful for the measuring electric permitivity and loss angle of excellent plastic films which have been developed recently as well as for sensitive detectors of automation systems.View full abstractDownload PDF (1421K) -
Takuso SATO, Shigeo KISHIMOTO1965 Volume 4 Issue 1 Pages 38-43
Published: January 10, 1965
Released on J-STAGE: November 26, 2009
JOURNAL FREE ACCESSMarkov chain is one of typical random processes and many phenomena can be explained by reducing them to this process. In this paper, all statistical aspects of arbitrarily given markov chains are closely examined. For this purpose, a generator of markov chaan was constructed using binary random number's sources and magnetic drum memory. As, in this device, information concerning transition matrix can be given in the form of a punched tape, an arbitrary transition matrix is easily given. As an example of applications of this device to operation research, a problem of machine management was simulated, while, as an example of applications to analysis of random process, an Ehrenfest Model was prepared and its statistical characters were tested. Furthermore, there was given the possibility of solving general parabolic type differential equations using this device.View full abstractDownload PDF (1670K) -
Yasushi ISHII1965 Volume 4 Issue 1 Pages 44-54
Published: January 10, 1965
Released on J-STAGE: November 26, 2009
JOURNAL FREE ACCESSIn a pulse counting type A-D converter, there is an inaccuracy of ±1 count in its digital output. This inaccuracy is composed of two components, one is a quantization error and the other an asynchronous error caused by the incoherency between clock pulse and gate signal of the converter. When an analog signal is converted into digital form, the asynchronous error acts as a dither noise on the analog signal, and in consequence, the stepwise input-output characteristic of the A-D converter is linearized “in average”. This paper describes the analysis of the foregoing phenomena and discusses the methods to utilize the asynchronous error to the design of digital correlators. An A-D converter using these methods was constructed, and several auto- and cross-correlation functions were measured with this device. From these experimental results, it was ascertained that, when the asynchronous error exists, correlation functions can be determined without the error due to quntization of the signals, even in case a very rough A-D converter is used.View full abstractDownload PDF (2090K) -
Tadashi ICHINOSE1965 Volume 4 Issue 1 Pages 55-57
Published: January 10, 1965
Released on J-STAGE: November 26, 2009
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Isamu ASANO1965 Volume 4 Issue 1 Pages 58-60
Published: January 10, 1965
Released on J-STAGE: November 26, 2009
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1965 Volume 4 Issue 1 Pages 64
Published: January 10, 1965
Released on J-STAGE: November 26, 2009
JOURNAL FREE ACCESSDownload PDF (143K)
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