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Volume 1 (1965)
- Issue 4 Pages 291-
- Issue 3 Pages 199-
- Issue 2 Pages 93-
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Volume 1, Issue 3
Displaying 1-12 of 12 articles from this issue
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Iwao MORISHITA1965 Volume 1 Issue 3 Pages 199-206
Published: 1965
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSA new adaptive filter is presented and its analytical and simulation studies are described. It requires no previous knowledge about the nature of its inputs. The only assumption is that the power spectral density of the signal component of an input x(t) is concentrated in a relatively narrow frequency band, and that of the input has its absolute peak in this frequency range. The device consists of a delay-line synthesiser with time-variable weights and a set of controllers. The synthesiser gives an output
y(t)=2lΣμ=0vμ(t)x(t-μΔt)+cx(t-lΔt)
where vμ(t) are time-variable weights, c is a constant weight and Δt is a delay time between taps. Each controller adjusts one weight for adaptation according to the following equation
Tdvμ(t)/dt+vμ(t)=x(t-μΔt)sgn[y(t)].
It can be shown that after sufficient length of time a suitable band-pass frequency characteristic for the extraction of the signal component is obtained. Initial values for vμ(t) are arbitrary. The analytical results are verified by some simulation studies on a digital computer.View full abstractDownload PDF (941K) -
Tadashi ICHINOSE1965 Volume 1 Issue 3 Pages 207-212
Published: 1965
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSThe method here reported is concerned with hydrometry by magnetic attraction of a coil acting upon a float with soft iron.
The coil is outside of the vessel containing the float and the liquid to be measured.
It is recognized experimentally that this method has the same merits as the formerly reported type, and besides them, it has other merits, for example
a) Either the density of liquid with more or less density than the float can be measured.
b) The current of coil may be either DC or AC.
etc.View full abstractDownload PDF (738K) -
Etsujiro SHIMEMURA, Yuichiro KOMATSU1965 Volume 1 Issue 3 Pages 213-220
Published: 1965
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSIn this paper the authors intend to give the general procedure to solve the time-optimal problem in the linear system with delay by applying the method of maximum principle. In the system with delay, the solution of the problem contains the essemtially different difficulties in contrast with the system without delay. The largest difficulty exists in that the auxiriary system involves the advanced arguments. This difficulty is removed by introducing the inverse-time system and applying the iteration procedure. The same inverse-time concept can be used for the mechanization of the computation procedure by an analog computer with a help of a simple circuitry. The concept of the isochrone is introduced in a certain limitted sense which gives clear understamding of the structure of the problem.View full abstractDownload PDF (1014K) -
Saburo KUMAGAI, Masaji MATSUMURA, Akira NAGATA1965 Volume 1 Issue 3 Pages 221-231
Published: 1965
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSThis paper is concerned with the design of the optimal controller for a sampled-data control system. Supposing that the plant is linear, time-invariant, and has a saturating input, then, the system is described by its state transition equation as follows;
xk+1=Gxkk+huk
|uk|≤1, k=0, 1, 2, ….
Consider a quadratic performance criteria of the form
JN=xN'QxN
where, N is a given positive integer and is the final sampling instant at which the control action terminates. The problem is to find the admissible control sequence {uk}N-1k=0 which minimizes JN for a given initial state and N.
In this paper, N-dimentional control space is introduced, and the gradient projection method proposed by J.B. Rosen is used to find the solution in the control space. It is shown that an algorithm to find the solution can be constructed in a sample fashion by means of the gradent projection method.
Finally, a numerical example is given to illustrate the proposed algorithm.View full abstractDownload PDF (1470K) -
Tsuyoshi TAKAFUJI1965 Volume 1 Issue 3 Pages 232-237
Published: 1965
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSSince “Electronic Digital Blending System” was developed, the control accuracy of “In Line Pipe Blending System” has been remarkably improved, and this fact has required the improvement of flow measurement and development of temperature compensator for volumetric flow meter.
As the temperature compensator, the electronic device is most desirable by virtue of its high stability and solid state construction, especially.
The temperature compenstor for volumetric flow meter in this report is an electronic device which is constructed by comparatively simple elements and operates independently on flow rate.
This device consists of digital acaler, electronic counter, voltage to frequency converter and pulse subtractor.
This device has 0.1% accuracy, less than 10 rangeability and operates at less than 5, 000c/s input pulse frequency.View full abstractDownload PDF (1845K) -
Hiromichi TOYOTA1965 Volume 1 Issue 3 Pages 238-245
Published: 1965
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSRoutine operation of differential pressure type gas flow meters for industrial purpose, has revealed various abnormal phenomena, e.g., (1) over-flow of mercury from the U-tube manometer to the transmission lines, (2) instability of the flow control system caused by choking of the transmission lines, (3) inserting the artificial restrictions into the lines for preventing hunting of recording and control, etc..
For the purpose of obtaining the common answers for the above mentioned cases, the abnormal responses of the differential pressure gas flow meter were analysed theoretically and experimentally.
When the time-constant in the one side of two transmission lines becomes much larger than the other side and the differential pressure at taps pd is changed in step-function, then the transient responses of the applying differential pressure to the transmitter pd' are indicated as follows:
pd'/pd=1-(1-a)e-t/T2 (T1<<T2)
pd'/pd=1-ae-t/T1 (T1>>T2)
when, T1 and T2 are the time-constants of the upstream and downstream transmission lines.
Process parameter a is the slope of the static pressure-differential pressure diagram of the gas flow system and is equivalent to dp1/dpd. (a>0: manipulated by the upstream valve, a<0: manipulated by the downstream valve)
The transient responses of pd' become either derivative or reverse responses according with the sign of a and the peak values of responses at start-up are dependent on |a|.
When two time-constants of both lines are same, the transient responses of pd' become the single-capacity type responses independent on a, i.e.,
pd'/pd=1-e-t/T (T1=T2=T)
To summarize, the conclusions are that the line time-constant of the same side to the manipulating valve or disturbance causes the reverse response of pd' and the one of the opposite side causes the derivative response.View full abstractDownload PDF (1113K) -
Hiroyuki TAKAI, Takeshi AGUI1965 Volume 1 Issue 3 Pages 246-254
Published: 1965
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSIn this paper, a synthesis of sampled data control system by continuos compensating networks is described. In this method, the sample and hold operation of the system is replaced approximately by a pure time delay of half a sampling period, then, appling the “Roots Specifying Method”, parameters of a compensating networks of the approximated system are calculated to achieve specified roots which satisfy the specified response. To show this procedure concretely, an illustrative example is considered.
The accuracy and the limitation of this method are also discussed and it is obtained that the compensating table and compensating chart which have been prepared already for continuous system synthesis can be used to simplify compensating calculation and residue limit can be also used as in continuous system.
As a conclusion, specification can be satisfied within 10% error, when the product of actual angular frequency and sampling period is smaller than 90°, by this method.View full abstractDownload PDF (3053K) -
Toyoji FUKAMI, Kazuaki HOMMA, Yasumasa KOBAYASHI1965 Volume 1 Issue 3 Pages 255-260
Published: 1965
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSModern semiconductor technology is making progress at a very rapid rate, and the new devices such as hall-coducer and other many semiconductor translators are being employed in many fields of instrumentation and control engineering.
A new semiconductor device-p-i(t) or p-i(t)-n type Si diode-has been developed as a negative resistance characteristic diode and oscillation diode, whose oscillation is produced by the action of magnetic field. The oscillation frequency has good linear relation with the applied magnetic field.
The negative resistance characteristic diode is useful for a switching device and a memory element in connecting with electric circuits, and also the oscillation phenomenon of the diode makes it much easier to detect the intensity of magnetic field as a digital value by measuring the oscillation-frequency.
In this present paper, some examples of applying the new type Si diode to analog-digital converter are described.View full abstractDownload PDF (3103K) -
Nobuo KAWABATA, Saburo TSUJI1965 Volume 1 Issue 3 Pages 261-268
Published: 1965
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSA manual control system in which a human operator performs the role of a kind of controller by utilizing his eyes as a transducer and his hand as an actuator is studied. A method is presented to measure the transfer characteristics of the manual control system, a discussion is made on the adaptive and learning characteristics of the system while the operator is in his transient state, and features are described of the response of the human operator in his steady state. Some relations between the gain of the handle in the system and the quality of control are given.View full abstractDownload PDF (3321K) -
Bunjiro SAITO, Minoru MEGURO1965 Volume 1 Issue 3 Pages 269-273
Published: 1965
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSThe displacement-current converter discribed in this paper can precisely convert a displacement to an electical current, having no effect on the object to be measured. To detect the displacement a small differential transformer driven with high frequency is used, so no part touches the object to be measured, and the pull torque that the transformer exerts on the object is zero.
This converter consists of a oscillator using a differential transformer as a coupling transformer, a direct current amplifier, a force motor and a spring. This is a sort of an motionbalance type converter whose output is fed back to the input by means of the force motor and the spring.
This device is ideal when one wants to measure a comparatively large displacement or when the object is sensitive and any force is not permitted to exert on it.View full abstractDownload PDF (501K) -
Masatada YONEMOCHI1965 Volume 1 Issue 3 Pages 274-281
Published: 1965
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSCharacteristics of load transmission mechanisms in automatic control systems are often affected by existence of backlash and friction due to gears, screw threads and bearings in the mechanisms. This paper dealt with the transmission mechanisms of open loop system from pilot valve to load in a valve-controlled hydraulic servo and their characteristics due to backlash were discussed in relation to load, gear train and stiffness of transmission shaft. The results of theoretical analysis were compared with experimental data obtained from frequency response test at the case of gear ratio 1. As the result, it was proved that the experimental data coincide with the theoretical values satisfactorily. Therefore, the theoretical analysis may be used to improve the performance of transmission mechanisms with backlash.View full abstractDownload PDF (1566K) -
Tomiji HISAMURA1965 Volume 1 Issue 3 Pages 282-290
Published: 1965
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSIn the optimum control problem, it is well known that the optimum controller is reduced to the on-off type one with suitable computing devices such as digital computer. However, these controllers are generally expensive because of its complexity which realizes the optimal strategy. This paper deals with the design of compensating element for on-off type sampled-data control systems based on the steady state response. It is aimed to give efficient regulation by the on-off controller with simple, easily constructed, compensating element and the limitation of this compensation is investigated. The relay characteristic is assumed to have its imperfection, i.e. hysteresis, and controlled plants are assumed to be linear. This method can be applied to higher order control systems as well as systems with dead time.View full abstractDownload PDF (1638K)
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