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Volume 1, Issue 2
Displaying 1-8 of 8 articles from this issue
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[in Japanese]1962 Volume 1 Issue 2 Pages 89-94
Published: February 10, 1962
Released on J-STAGE: October 21, 2010
JOURNAL FREE ACCESSDownload PDF (2308K) -
Yoshiro HORI, Yukihiko SATO1962 Volume 1 Issue 2 Pages 95-101
Published: February 10, 1962
Released on J-STAGE: October 21, 2010
JOURNAL FREE ACCESSAlthough various attempts have been made to measure the temperature of running wire, principles employed in most of them are theoretically inconvenient for this purpose. Authors have developed a new wire temperature measuring apparatus which is reliable in principle and practically has brought about good results.
Wire whose temperature is to be determined runs through the inside of coaxial cylinder sensing element. So far as the wire is running and the end effect can be neglected, it is possible to keep the coaxial: ylinders to be at the same temperature as that of the wire. This is performed by controlling the temperaure of outer cylinder to be equal to that of inner cylinder. Under this condition, the wire temperature is letermined simply by measurement of inner cylinder temperature.
In this method, errors due to wire speed, emissivity of wire surface and ambient temperature never arise. Whether the wire surface is conductive or insulated proves no hindrance to the measurement. Wire temperature to be determined is not disturbed by the installation of the sensing element when the apparatus is working. The size of wire whose temperature can be measured by this apparatus is now limited up to 1.4mm, but sensing element suitable for larger size can be manufactured without difficulty.
Accuracy is estimated better than ±2deg. C (room temperature-200°C) through comparison of the value measured by the apparatus with the wire resistance measured simultaneously.
Dynamic characteristic is difficult to test, because wire temperature cannot be changed as is wanted. But it can be obtained from the limit to which response of the apparatus to the change of the wire-heating current approaches when wire speed becomes very high.
Wire temperature control and temperature measurement in case wire is drawn are also mentioned.View full abstractDownload PDF (1252K) -
Tadao KUMODA1962 Volume 1 Issue 2 Pages 102-108
Published: February 10, 1962
Released on J-STAGE: May 24, 2011
JOURNAL FREE ACCESSWhen the Manganin wire is used in wide temperature scope, its quality should be considered as the function of not only the primary temperature coefficient of resistivity α20 but the secondary temperature coefficient β20 and temperature scope to be used. The author, defining the thermal variation of resistance w (%) to represent the quality of Manganin wire, has shown some experimental way to derive it smoothly. To do this, he divided the temperature range into four stages of each temperature of which the resistance value becomes maximum. Then he derived for each stage such equations as Eqs. (10)-(13) in this paper. These equations are useful to show the possible value of α0 and β0 in order to derive the desired thermal variation (Fig. 2). On a resistance element, the following equation can be easily obtained from several measuring points:
_??_
When every plot of this equation falls inside an encircled zone of Fig. 5, the thermal variation of this element must be within desired value.View full abstractDownload PDF (842K) -
Masanao MORIMURA, Keiichi TANAKA, Yoshiaki NEZU1962 Volume 1 Issue 2 Pages 109-114
Published: February 10, 1962
Released on J-STAGE: October 21, 2010
JOURNAL FREE ACCESSA Constant speed feeding mechanism which is driven by the lead screw is constructed in order to make the “magnetic scale” type position encoder. The uniformity of the feeding speed at the “writing” head, which is fixed on the feeded carriage, is disturbed by undesirable motion of the carriage due to 1) inaccuracy of the restraint mechanism, 2) pitch error of the driving screw and 3) variation of rotating speed of the driving motor. The experimental procedure to examine these influences is set up and the results show that the influences of the restraint mechanism and the rotating speed variation are negligiblebut the pitch error gives rise to irregular feed-rate (defined as the displacement of the table per revolution of the driving screw). Therefore, the range of uniform feed-rate is estimated by the t-inspection method and then the feeding speed is measured in the range. The variance of the feeding speed measurement is compared with that of the feed-rate measurement by the F-inspection method. The results show that the variation of the feeding speed is mainly due to the pitch error of the driving screw. The numerical results are as follows:
Mean feed-rate4.9967mm/rev.
Standard deviation of feed-rate1.8μ/rev.
Mean feed-speed4.9962mm/sec.;Standard deviation of feed-speed2μ/sec.View full abstractDownload PDF (1015K) -
Tomiji HISAMURA1962 Volume 1 Issue 2 Pages 115-123
Published: February 10, 1962
Released on J-STAGE: October 21, 2010
JOURNAL FREE ACCESSThis paper presents a time domain investigation about the self-excited oscillation of relay-type feed back control systems with sampling and dead time. Because of the relay, dead time, sampler and holder involved in the system, there exists a self-excited oscillation whose amplitude and period vary within certain restricted ranges. The general method for calculating these ranges is studied at first by extending Hamel's method to the case of sampled-data control systems and then boundary values of these ranges are calculated about the second and third order feedback control system. Generally, the period of the self-excited oscilla tion is exactly obtained by applying this method, even though the system has higher-order dynamic elements. However, it is difficult to calculate the exact value of its amplitude especially in the case of higher-order systems. Describing function method utilizing the period obtained above can be used to avoid this difficulty for determining the amplitude.View full abstractDownload PDF (900K) -
Atsushi TSUTSUMI1962 Volume 1 Issue 2 Pages 124-134
Published: February 10, 1962
Released on J-STAGE: October 21, 2010
JOURNAL FREE ACCESSDescribed herein is a Data Reduction System which is all transistorized and consists of a input output part, a central processor of stored-program type and a drum memory. Input signals (0-5V) from the transducers of electronic controllers are switched by reed relays at the rate of 30 msec per point. Addresses up to 512 are provided in the memory for storing the original process data, which are digitized by AD/DA converter of 0.1% accuracy. Digital input signals including on-off switch signals can also be accepted. The totalizing circuit to accumulate digital signals of electric power, flow, etc. up to 128 points is useful to eliminate the totalizer in instrumentation. The system has analog and digital output. Output signals (0-5V) are given to the electronic controllers' set-points for opti num process control. Controllers up to 128 can be connected with the system. Digital output are log sheets by the type-writers, on-off control signals and digital informations sent to other digital equipment.
Brief specifications of the central processor are as follows: 24 bits word including sign bit; fixed point and fractional expression; stored program; 1+11/2 address; 23 basic instructions; addition and sub traction time 1.10 msec; multiplication time 4.53 msec; division time 4.85 msec: maximum memory capa city 32 000 words on the drum.
The systen design for reliability, cost down and high speed operation of the syste n is described first. Second is input-output part. Third, the description on the central processor includes the state-counter controlling the operation, usage of a single flip-flop for many purposes, execution time and non-restoring method in division, and switches used for protection of stored-program from noise disturbance. One-word register on the dru n and read/write amplifier of non-return-to-zero method are described in the chapter of drum memory.View full abstractDownload PDF (1342K) -
Koichi HISADA1962 Volume 1 Issue 2 Pages 135-140
Published: February 10, 1962
Released on J-STAGE: October 21, 2010
JOURNAL FREE ACCESSAn electronic flow transmitter with square root extraction, the output of which is directly proportional to the flow, has such features as suitability for flow measurement of large turn down and easy applicability to flow signal computation. As this type of force balance system has a nonlinear element in its feedback path, there are more difficult problems in the design of flow transmitters than that of the conventional differential pressure transmitter. Initially presented in this paper are some points to be considered at the time of design, where special empasis is placed on the effects of the nonlinearity upon the overall characteristics and some methods to improve both static and dynamic characteristics are discussed. Finally given are the fundamental equations and a typical design procedure of the electromagnet system which is a feedback element acting as a squaring device and is one of the most important components in this transmitter.View full abstractDownload PDF (810K) -
[in Japanese], [in Japanese]1962 Volume 1 Issue 2 Pages 141-145
Published: February 10, 1962
Released on J-STAGE: October 21, 2010
JOURNAL FREE ACCESSDownload PDF (979K)
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