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Volume 2, Issue 4
Displaying 1-7 of 7 articles from this issue
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[in Japanese]1963 Volume 2 Issue 4 Pages 235-243
Published: April 10, 1963
Released on J-STAGE: October 21, 2010
JOURNAL FREE ACCESSDownload PDF (1611K) -
Ichiro KIMURA1963 Volume 2 Issue 4 Pages 244-248
Published: April 10, 1963
Released on J-STAGE: October 21, 2010
JOURNAL FREE ACCESSForce-balance type differential pressure transmitter has liquid in its connecting pipes when it is used to measure a flow rate of liquid, a flow rate of corrosive gas with substituting liquid or a liquid level. Described in this paper is an analysis of self-excited oscillations of the same transmitter in such a condition. The method of judging the stability of a system consisting of the liquid and the differential pressure transmitter is given on an actual example. It is proved that the result of experiments is in good coincidence with that of judgment.View full abstractDownload PDF (3267K) -
Tadashi YAMASHITA1963 Volume 2 Issue 4 Pages 249-257
Published: April 10, 1963
Released on J-STAGE: May 24, 2011
JOURNAL FREE ACCESSIt is difficult to fully automatize the materials handling process which is contained in many industrial processes. Although it needs devices that can operate in three dimensions, they have scarcely been investigated. Some basic informations to construct such devices are pressented in this paper.
As human fingers are seemed to be the best model, the author analysed their function from the viewpoint of degree of freedom. The relations between fingers and objects are classified and the fundamental relations are selected out. Then, how the increase of the degree of freedom effects the function of fingers is analysed. Its results are given in chart. This chart is named “capability chart” by the author. A formula is introduced to estimate the function of fingers relating to their number and degree of freedom, and a calculated example is given. The results are as follows; the function of fingers becomes higher as their degree of freedom increases to some extent. When the degree becomes some number, the increase of the function is little, then one finger is added, the function increases as before.View full abstractDownload PDF (6839K) -
Kageo AKIZUKI1963 Volume 2 Issue 4 Pages 258-266
Published: April 10, 1963
Released on J-STAGE: October 21, 2010
JOURNAL FREE ACCESSIn this paper, the author intends to decide the characteristics of optimum control systems with stationary random inputs. To get useful data for actual design of optimum control systems, the author calculates mean square error values (M. S. E.) of second order systems. For input power density spectra, three typical types are chosen as follows:
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The results of these calculations are put into order on many graphs. From these, we can find many important things as given in the following:
(1) To decrease M. S. E., natural frequency of control system must be decided far larger than input frequency band.
(2) In general, the smaller value of damping ratio ζ of control system brings, the larger M. S. E. but when ζ is somewhat large, deviation from the minimum M. S. E. is small.
(3) When the input power density-spectrum is of type 1 or type 3 and the above Item 1 is satisfied, the optimum damping ratio is in the same value as that of minimizing the integrated square error value of step input.
Taking into consideration the above Item 3, relations between transient characteristics and the above characteristics are investigated.
These results and graphs are believed to be useful for designs of control systems with stationary random inputs.View full abstractDownload PDF (1310K) -
Kunihiko ICHIKAWA1963 Volume 2 Issue 4 Pages 267-272
Published: April 10, 1963
Released on J-STAGE: October 21, 2010
JOURNAL FREE ACCESSAlthough it is convenient to represent the controlled process as the system with dead time plus first order lag in the analysis and synthesis of process control system, it is not always necessary to do so in the field of nonlinear control system, where in some occasions it is more convenient to deal with high order differential equation than to deal with low order differential-difference equation and vice versa in other occasions. It is necessary, therefore, to ascertain the equivalency between dead time and parasitic lag. The author compared the indicial responses of the system involving parasitic lag with those of the system involving dead time, where parasitic lag or dead time was assumed to be added to the fundamental second order linear servomechanism. The lag system was analyzed by solving three order differential equation, while the dead time system was done by frequency response and harmonic analysis method. The accuracy of the indicial responses of the latter system was checked by the direct solution of differential-difference equation. It was revealed that the parasitic lag, if multiplied by coefficient 0.92, could be replaced by dead time, while dead time, if multiplied by coefficient 1.09, could be replaced by parasitic lag.View full abstractDownload PDF (840K) -
Tomoaki MORINAGA1963 Volume 2 Issue 4 Pages 273-280
Published: April 10, 1963
Released on J-STAGE: October 21, 2010
JOURNAL FREE ACCESSIn the former report, transfer functions of liquid composition of binary distillation column were derived for reflux flow change and vapor flow change. Discussed here in more detail is an important effect of liquid flow lag for the frequency response. It is proved by numerical results that in the case of vapor flow change, the liquid flow lag and liquid hold-up change caused by vapor flow change are the main cause of large phase lag in high frequency range. Transfer functions for feed flow change and feed concentration change are derived by the same method as in the case of reflux flow change and vapor flow change. It is also found that when experimental frequency responses obtained by a distillation column of 6 trays are compared with theoretical values in the case of feed flow change, the latter shows a similar trend as that of the former.View full abstractDownload PDF (1167K) -
[in Japanese]1963 Volume 2 Issue 4 Pages 282-285
Published: April 10, 1963
Released on J-STAGE: October 21, 2010
JOURNAL FREE ACCESSDownload PDF (743K)
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