JaLCDOI 10.18926/15558
FullText URL Mem_Sch_Eng_OU_1_130.pdf
Author Wada Tsutomu| Ohgishi Shinji|
Abstract The method of the harmonic analysis of the human operator's characteristics by means of an analog computer is described. The human operator's characteristics in the closed loop system are described by vector locus. The human operator controls in response to the sine wave input so as to make constant the gain in the closed loop system. In accordance with the change of the input frequency, the operator changes his control action. Consequently the transfer function of the human operator's characteristics is too complex and difficult to be described by a linear element.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1966-03-31
Volume volume1
Issue issue1
Start Page 130
End Page 133
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307865
JaLCDOI 10.18926/15557
FullText URL Mem_Sch_Eng_OU_1_120.pdf
Author Wada Tsutomu| Sawaragi Yosikazu| Yonezawa Yoo|
Abstract We attempt to apply the feedback compensation technics of on-off controller to the pneumatic systems. In this paper, we describe the structure and the action of a new developed pneumatic on-off controller with feedback compensation, and the principle of the special pilot valve which is used in the controller as the on-off element. Next, it is shown analytically and experimentally that the dynamic characteristics of the controller are nearly equal to those of the continuous one which has an infinite proportional gain instead of the on-off element, if the time average of its discontinuous output is treated as the output of the controller.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1966-03-31
Volume volume1
Issue issue1
Start Page 120
End Page 129
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307543
JaLCDOI 10.18926/15573
FullText URL Mem_Sch_Eng_OU_2_35.pdf
Author Wada Tsutomu| Ohgishi Shinji|
Abstract An analysis is attempted of the human operator's responses to the sinusoidal input and the random input. The human operator's characteristics in the closed loop system are represented by the Bode diagram. This diagram shows that the human operator's response to the random input containing only those frequency components lower than 4 rad/s is almost in accordance with his response to the siunsoidal input of the same frequency range.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1967-04-01
Volume volume2
Issue issue1
Start Page 35
End Page 38
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307455
JaLCDOI 10.18926/15602
FullText URL Mem_Sch_Eng_OU_3_31.pdf
Author Wada Tsutomu| Shimizu Akira|
Abstract This study is concerned with a developed method for obtaining the quantitative relations between the input or output characteristics and the geometric parameters of the wall reattachment fiuidic devices. In this report, it is shown analytically and experimentally that the characteristics can be represented by the functions, dependent on the geometric parameters only, with non dimensional quantities, if the Reynolds number at the main jet nozzle is sufficiently large. Accordingly, the quantitative relations of the geometric parameters may be analyzed more easily.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1968-09-01
Volume volume3
Issue issue1
Start Page 31
End Page 37
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307757
JaLCDOI 10.18926/15686
FullText URL Mem_Sch_Eng_OU_5_31.pdf
Author Wada Tsutomu| Shimizu Akira|
Abstract Though the Warren's fluidic counter has a very simple construction, the matching problems of the main jet supply pressure with the input pulse may take place and so there may be some working conditions under which this counter cannot work. Up to now, these matching problem have been hardly investigated. In this study the following things were systematically investigated : the static and dynamic characteristics of the memory and the control flip-flops with different geometric parameters, the behavior of the counter which are constructed by two of them, and finally the fow in the counter. The obtained results are as follows : (1) Under some clear and accurate conditions, the Warren's counter works satisfactory without any au iliary circuit. (2) In the control part, the input pulse flow don't reattach on any side wall, but branches into both output ports. (3) The necessary condition under which the Warren's counter behaves successfully is as follows : (1-2α)Q(i)>Q(ms), where α is the distribution factor of the control part, is the input pulse flow rate and is the switching control flow rate of the memory part.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1970-09-01
Volume volume5
Issue issue1
Start Page 31
End Page 35
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307883
JaLCDOI 10.18926/15634
FullText URL Mem_Sch_Eng_OU_6_21.pdf
Author Wada Tsutomu| Shimizu Akira|
Abstract In this report, the effects of splitter position on the attached jet were experimentally investigated for the purpose of discussing the applicability of a usual mathematical model without splitter. As results, the followings were confirmed, (l) For the splitter distance shorter than the critical distance, the pressure in the bubble lowers and the jet radius of curvature shortens. (2) At the ratio L(s)/D=4~5, the switching control flow rate becomes maximum. And bordering this value, the effects of splitter position on the switching are quite conversely. For the splitter distance longer than the above value, the switching control flow rate decreases, as increasing the distance. (3) For the splitter distance of 1.5~2 times critical distance, the switching is almost never affected by the splitter.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1971-09-01
Volume volume6
Issue issue1
Start Page 21
End Page 25
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307823
JaLCDOI 10.18926/15657
FullText URL Mem_Sch_Eng_OU_8_1_25.pdf
Author Wada Tsutomu| Shimizu Akira| Takagi Minoru|
Abstract The effects of some geometries peculiar to the wallattachment fluidic devices on the attaching jet flow and the switching mechanism were experimentally made clear. And the propriety of the analytical mOdel, which has been used for the theoretical study of these devices, was investigated. The results can be summarized as follows: 1) The existing analytical model of the attaching jet flow is not applicable to the case of relatively short wall length of vent distance. 2) The attaching jet flow never detaches from a sufficiently long side wall with vent. 3) The switching mechanism of the vent type device is always the opposite wall switching. 4) From the viewpoint of the output characteristics of the device, the vent distance has a lower limit in relation to the vent width.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1973-07-20
Volume volume8
Issue issue1
Start Page 25
End Page 40
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307550
JaLCDOI 10.18926/15660
FullText URL Mem_Sch_Eng_OU_8_2_52.pdf
Author Wada Tsutomu| Shimizu Akira| Dohta Shujiro|
Abstract The dynamic behaviour of attaching jet with single side wall to step control flow and the switching proces of the bistable amplifiers were investigated experimentally and theoretically. In the experiments, a large scale model was used with water. The flow patterns were visualized by the tracer of polystrene granules and were recorded by a cinecamera. In the analysis, the quasi-steady proces was assumed. The results obtained can be summarized as follows: 1) The proposed analytical dynamic model of attaching jet explains well the dynamic behaviour of attaching jet with single side wall. 2) The process" of the opposite wall switching may be divided into three phases. 3) The analytical model of the opposite wall switching, including the formulation of the switching criterion, was proposed.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1973-12-26
Volume volume8
Issue issue2
Start Page 52
End Page 65
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307728
JaLCDOI 10.18926/15738
FullText URL Mem_Sch_Eng_OU_14_1_29.pdf
Author Wada Tsutomu| Shimizu Akira| Dohta Shujiro|
Abstract Effect of the geometrical configuration of wall-reattachment fluidic device on the switching dynamics, the switching time, and its dispersion, was investigated experimentally by using a large scale model. The results obtained can be summarized as follows: 1) The switching time, its dispersion, and switching probability depend upon the connection of the input to the control port. 2) Effect of the vent and splitter on the jet in dynamic switching is explained commonly by using the margin of a given control flow rate to the switching control flow rate. 3) The switching time ,decreases as input increases, whereas its dispersion remains constant except for small input.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1979-12-01
Volume volume14
Issue issue1
Start Page 29
End Page 37
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307477