巻号一覧
17 巻, 9 号
選択された号の論文の13件中1～13を表示しています
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井上 俊彦, 北川 伸一, 有本 卓1981 年 17 巻 9 号 p. 873-879
発行日: 1981/12/30
公開日: 2009/03/27
ジャーナル フリーIn recent years, linear multivariable control theory has been developed extensively. Today, it seems to be brought to near completion. However, advanced control technics such as optimal control, state estimation etc. have scarcely been applied to real industrial processes. To help bridge the gap between theory and practice, it is necessary to undertake experimental investigation on pilot model plants by applying such technics. In view of these, a boiler model plant is utilized in this paper to examine one of modern digital control technics.
The test plant is modeled by a two-dimensional discrete-time linear dynamical system which is obtained by linearizing lumped-parameter energy and mass balance equations and discretizing them through sampling and holding. The purpose of control is to maintain controlled variables (drum pressure and drum liquid level) at the normal set points under step-wise changes of steam-valve opening and random environmental disturbances. Then an FTSC algorithm (Finite Time Settling Control) recently proposed by Y. Takahashi and M. Tomizuka is applied to the model plant. In the beginning, a direct application of the algorithm yields an unsatisfactory system performance, resulting in excessively oscillatory responses. Therefore, two types of correction for control gain matrices are proposed, one of which is based on introducing staleness-weighting factors into the discrete transfer function matrix and the other adopts another gains designed by a single-loop parameter tuning method. After this correction, the FTSC algorithm gives rise to a satisfactory result.抄録全体を表示PDF形式でダウンロード (902K) -
村上 勝志, 嘉納 秀明, 加藤 誠1981 年 17 巻 9 号 p. 880-886
発行日: 1981/12/30
公開日: 2009/03/27
ジャーナル フリーMany nonlinear dynamics in practical problems, for example, isothermal multicomponent chemical reactors, fermentation processes, urban dynamics, and population ecology, are represented by polynomic nonlinear systems.
This paper is concerned with problems to identify unknown parameters of polynomic nonlinear systems by the model reference adaptive identification technique.
First, sufficient conditions for identifiability of unknown parameters of polynomic systems are obtained. They are divided into two conditions regarding the structure of the system matrices and input-output data. The latter is replaced by a rank condition of constant matrices by expanding inputs and outputs into power series in time.
Secondly, identification schemes using Lyapunov's direct method are applied to identify unknown parameters contained linearly in the polynomic systems. Some conditions assuring asymptotical stability in the large of the estimation errors are obtained. Furthermore, identification of discrete polynomic systems is also considered.
Finally, computer simulation results are preserved to illustrate the utility of the identifier proposed for the polynomic systems.抄録全体を表示PDF形式でダウンロード (847K) -
築山 誠, 福田 豊生1981 年 17 巻 9 号 p. 887-893
発行日: 1981/12/30
公開日: 2009/03/27
ジャーナル フリーThis paper is concerned with the fuzzy approach to estimating network flow in the case of insufficient observation. As a system is large scale in the real world, it is difficult to observe the all elements necessary for computation of network flow. For example, only when the boundary is known such as voltage or current source in electrical network, the network flow is completely calculated. But it is not practically possible to have the complete measurement system of boundary flow in the real world network system as water supply network. It is usual for us to know only the partially observed network flow and boundary flow. This insufficient observation induces mathematically the indeterminate solution of network system equation.
We developed a new fuzzy approach to estimating to the network flow to circumvent the above mathematical problems. This method is based on two facts one of which is that we can suppose the boundary flow from our operating experiences ambiguously, and the other is that the estimated value should satisfy the system equation constrained by already observed flow. The fuzzy set theory is introduced to tell the ambiguity of assumed boundary flow and to decide which estimation best.
The method is powerful and practical since it consideres both possibility of assumption and realizability of flow satisfying the network system. For instance, although we assign high possibility to some wrong assumption, since it does not make the flow from assumption satisfy observed value, that assumption is abandoned.
The further discussion of algorithm and some properties are presented. And a numerical example of water supply network flow estimation is shown.抄録全体を表示PDF形式でダウンロード (956K) -
砂原 善文, 相原 伸一, 石川 昌明1981 年 17 巻 9 号 p. 894-900
発行日: 1981/12/30
公開日: 2009/03/27
ジャーナル フリーThe purpose of this paper is to study the state and free boundary estimates for distributed parameter systems with stochastic free boundary.
First, the mathematical model of the distributed parameter system with the stochastic free boundary is transformed to the stochastic distributed parameter system with the fixed domain by the change of variable and furthermore its existence theorem and regularity of the solution are established. Secondly, both the state and free boundary estimator equations are derived by using the martingale and innovation approaches.抄録全体を表示PDF形式でダウンロード (786K) -
中谷 登, 西川 恒明, 中野 康夫, 山田 朝治1981 年 17 巻 9 号 p. 901-907
発行日: 1981/12/30
公開日: 2009/03/27
ジャーナル フリーIn the previous papers we reported that the wall-attachment fluidic element (Amp. 2) with parallel walls and diverging area in the main nozzle has shorter switching time than that of the element (Amp. 1) with parallel walls.
To make the effect of turbulence, especially coherent structure, on the switching time in those elements clear, their space correlation coefficients are measured by the use of the new developed LDV. The LDV makes it possible to measure the space-time correlation of flow velocities at two points easily, and to reduce the ambiguity noise by correlating signals from two frequency trackers at two points close to each other having the same velocity for measurement of space correlation coefficient. The space iso-correlation contours are obtained from the measured space correlation coefficients. The results are as follows.
At the jet unattaching side in the down stream near by the exit of the main nozzle, the shapes of the eddies in Amps. 1 and 2 become ellipsoid. The eddy in Amp. 2 becomes more flat and extended longer to the jet center than that in Amp. 1. And the major axis of the ellipsoid in Amp. 2 is inclined at larger angle with the flow direction than that in Amp. 1. At the jet attaching side in that down stream and at the wall side in the space correlation abscissa the eddy is constrained by the wall. Consequently the sizes of the eddies in both elements become almost same. At the jet side of the space correlation abscissa the eddy is not constrained by the wall, so that the eddy in Amp. 2 becomes extended longer to the jet center than that in Amp. 1. The larger coherent structure of Amp. 2, compared with that of Amp. 1. makes the entrainment of the surrounding fluid larger and the diffusion of the jet larger. This plays an important role in shortening the switching time抄録全体を表示PDF形式でダウンロード (1526K) -
幸田 武久, 井上 紘一, 熊本 博光, 高見 勲1981 年 17 巻 9 号 p. 908-913
発行日: 1981/12/30
公開日: 2009/03/27
ジャーナル フリーThe optimal logical structure is developed for safety monitoring systems, which have two types of contradictory failures; a fail-dangerous failure and a fail-safe failure. The optimal structure which minimizes an expected damage caused by the two types of contradictory failures is analytically shown to be k*-ont-of-n: G system among all the coherent structures composed of n identical components. A simple formula to find the optimal k* is obtained. We discuss how the optimal k* varies, depending on the two failure probabilities of the sensor, the probability of the plant failure and damages caused by the two types of contradictory failures of the safety monitoring system. Illustrative examples are given.抄録全体を表示PDF形式でダウンロード (849K) -
藍 光郎, 島添 道隆, 西原 元久, 山田 一二, 嶋田 智, 保川 彰夫1981 年 17 巻 9 号 p. 914-919
発行日: 1981/12/30
公開日: 2009/03/27
ジャーナル フリーThis paper describes a high accuracy displacement sensor using deffused type semiconductor strain gages. This sensor consits of a canti-lever made from iron-nickel-cobalt alloy with low thermal expansion coefficient along with high elasticity, and two silicon pellets having respectively two p type resistors diffused on the (110) plane with the [111] direction. These pellets are bonded on both surfacs of the canti-lever with eutectic alloy solder, respectively, so that the pellet's [111] direction is parallel to the direction of stress.
Four strain gages on both surfaces of the canti-lever form a wheatstone bridge and the strain caused by the displacement of the cantilever tip is transduced into a voltage through this strain gage bridge.
Non-linearity, sensitivity and temperature effect of piezoresistance are affected by such factors as the plane and direction of silicon crystal, surface concenttation of impurities, relative directions between strain and current, and maximum strains applied.
Experiments using silicon canti-levers have proved that the (110) plane and [111] direction are suitable for crystal, and also that a suraface concentration of 2×1018/cm3 is optimum for impurities. It is further shown that the smallest nonlinearity of ±0.2% is obtained with a tensile stress of 300MPa applied on the longitudinal gage.
Displacement sensors satisfying the conditions mentioned above are manufactured and their characteristics are cofinrmed; the non-linearity is less than ±0.1% under the applied strain of 700με and a zero point shift below ±0.2% is obtained under the respeated strains of 108 times.
The temperature coefficient of semiconductor non-linearly relates to the temperature coefficients of piezo-resistor and piezoresistance coefficient, respectively. It is confirmed that temperature effects on the zero point and the span are less than ±0.5% respectively over the wide temperature range of 230-390K using a non-linear compeasntion procedure combining thick film thermistors with diffused type semiconductor resistors.抄録全体を表示PDF形式でダウンロード (754K) -
吉岡 宗之, 森川 敬信1981 年 17 巻 9 号 p. 920-926
発行日: 1981/12/30
公開日: 2009/03/27
ジャーナル フリーThis paper deals with the step response of volume-terminated pneumatic transmission lines. The calculated response waveforms of the single line and the branched line systems on the basis of frequency characteristics-i.e. Brown's transmission line model and adiabatic load impedance-are presented and compared with experimental results As a consequence, the agreement between experiment and calculated results is good in all cases. Therefore, it may be concluded that the method of step response calculation on the basis of frequency characteristics is useful for the analysis of volume-terminated transmission line systems.抄録全体を表示PDF形式でダウンロード (3062K) -
高森 年, 宮本 裕一, 米持 政忠1981 年 17 巻 9 号 p. 927-932
発行日: 1981/12/30
公開日: 2009/03/27
ジャーナル フリーDistortions and noises on fluidic pulse signal transmissions frequently cause a decrease in performances of a digital fluidic control system: that is, a misoperation of the switching motion in fluidic elements due to the signal noises, a timing error of control actions due to the signal distortion, etc.
In this study, a new method of design on a fluidic pulse signal transmission filter has been developed for the purposes of a removal of transmission distortions and high frequency noises. This filter is designed to have a flat characteristic curve in amplitude in the pass frequencies and in group delay in the all ranges. The design method and its procedure are similar to those of the analog transmission filter which have already been developed.
The characteristic tests of designed filters have represented good transmission results.抄録全体を表示PDF形式でダウンロード (1024K) -
小山 紀1981 年 17 巻 9 号 p. 933-938
発行日: 1981/12/30
公開日: 2009/03/27
ジャーナル フリーIn this paper, a new design of pneumatic band pass filter is described. The band pass filter uses the resonance of the diaphragms in the pneumatic coupling condenser circuit. Pneumatic oscillating input signals are transferred to output by transformed into mechanical vibrations of diaphragms in the band pass filter. When natural frequencies of diaphragms are designed to be low, the filter can be used lower signal frequency range than the other pneumatic filters such as Helmholtz resonater that utilized solely pneumatic vibrations.
Gain characteristics of pneumatic band pass filters in the range of central frequencies 25 to 90Hz were tested. The filters were made by combining ruber diaphragms, of which natural frequencies are 18Hz and 33Hz, and a metal diaphragm. As the result, it was shown that these filters have the cut off characteristics of 90 to 160dB/decade.
Theoretical values of gain characteristics of band pass filter were deduced with the equation of the diapragms. These calculated values and experimental ones show good agreement.
The effects of natural frequencies of diaphragms and vent resistance of band pass filter are also discussed.抄録全体を表示PDF形式でダウンロード (1194K) -
木村 幸男1981 年 17 巻 9 号 p. 939-944
発行日: 1981/12/30
公開日: 2009/03/27
ジャーナル フリーRecently customer-operating terminal devices are frequently noticed everywhere. This fact illustrates an intention to save persons in charge of service systems supported by the progress in LSI technology.
When we design the service system which contains the customer-operating terminal devices, it is a key factor not to make the customers wait for receiving service of the system. The first step that solves this problem concerning to the terminal devices would be to evaluate quantitatively the method of terminal use, the operating time of the devices and etc.
In case of customer's terminal operation it may be inffered that the operation errors occur comparatively more than those of a well-trained person in charge. The occurrence of errors may depend upon input items and interactive methods of terminal operation. Therefore we generalize the interactive operating method which was adopted on a feasibility study of the telephone called seat reservation of J. N. R., then propose and analyze its model.
This model results in a simple Markov process which denotes that a customer inputs and confirms item after item. In this case, the analysis of the operation process becomes easy as the process can be simply formulated. By the formulated equation we estimate the operation errors when a customer closes in the midst of the terminal operation and indicate the calculation of the expected operation time.抄録全体を表示PDF形式でダウンロード (783K) -
増田 良介, 佐々 修一, 長谷川 健介1981 年 17 巻 9 号 p. 945-950
発行日: 1981/12/30
公開日: 2009/03/27
ジャーナル フリーRecently, the proximity sensors which are able to detect the situations of objects at a close range, are paid an attention and are used in the flexible automation system.
In this paper, the authors propose a new principle of proximity sensor, and evaluate its characteristics by the experiments.
The optical proximity sensors, so far, have been based on detecting the intensity or timing of reflex light, but here, we made up the simple sensor based on measuring the phase shift of modulated reflex light from the object. It can measure the distance and the inclination angle of the object as well without being affected by the reflection factor.
Basic elements of the proposed sensor consist of light sources and one optical detector faced to the object respectively. In case of distance measurement, two light sources are located asymmetrically to the optical detector, and driven by sin ωt and cos ωt signal. The distance can be obtained as the function of the phase angle of reflex light signal detected.
In case of inclination angle measurement, two light sources are located symmetrically differing from above configuration. The inclination angle can be measured as the function of the phase angle of reflex light signal.
The proximity sensor and its signal processing circuit are made combining the two principles mentioned above, and the effectiveness of the sensor is confirmed by the result of the experiments.抄録全体を表示PDF形式でダウンロード (1255K) -
1981 年 17 巻 9 号 p. 952
発行日: 1981年
公開日: 2009/03/27
ジャーナル フリーPDF形式でダウンロード (99K)
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