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Volume 17, Issue 4
Displaying 1-13 of 13 articles from this issue
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Hajime MAEDA, Shigetoshi OKANO, Shinzo KODAMA, Hideo KUSUOKA1981 Volume 17 Issue 4 Pages 455-460
Published: July 30, 1981
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSThis paper discusses the structural identifiability of compartmental systems. This concept is related to the following problem: Given an input-output observation, and given a priori knowledge of graphical structure of interconnections of compartments, can we uniquely determine the unknown rate constants? This is an important and fundamental problem for determining the structure of compartmental systems. We pose a new definition of structural identifiability (abbreviated to SI) to avoid the confusion and misunderstanding appearing in the literature, and then give an algebraic equivalent condition for SI. Based upon this result, we obtain a new aspect to the SI: Concerning driving point systems, if a compartmental system is SI, the dual system whose paths are in reverse directions is also SI. If an open system is SI, the closed system is SI and vice versa. Concerning transfer systems, if a closed system is SI, then the open system is SI.
These results would be useful to obtain the complete answer for the structural identifiability of compartmental systems.View full abstractDownload PDF (911K) -
Toshio YOSHIMURA, Yoshiyuki OKAMOTO, Keigo WATANABE, Takashi SOEDA1981 Volume 17 Issue 4 Pages 461-466
Published: July 30, 1981
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSThis paper is concerned with the construction of a diffusion model for predicting SO2 concentration in Tokushima prefecture. Firstly, the Fick's diffusion equation denoting SO2 concentration is constructed where pollutant source intensities from stack emissions are estimated by fuel comsumption rate and sulpher content, and the diffusion parameters are determined by the method of least squares. Secondly, SO2 concentration is predicted one hour in advance by applying estimation theory to the diffusion model. Simulation results indicate that the proposed method is effective for the prediction of SO2 concentration.View full abstractDownload PDF (1260K) -
Morikazu TAKEGAKI, Suguru ARIMOTO1981 Volume 17 Issue 4 Pages 467-472
Published: July 30, 1981
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSIn general, it is very difficult to control motions of mechanical manipulators by usual deterministic control methods in a wide range of motions, because of complex nonlinearities of the dynamics and uncertainy of parameters of the system.
In this paper, we propose an adaptive control method to track desired trajectories wich are described by arbitrary task-oriented coordinates. Since the control method requires neither a knowledge of parameters of the system nor complicated calculation, it is easy to implement the method by a micro-computer. Effectiveness of the proposed control method is verified by several simulations. Particularly, an adaptive control law for compensating an acceleration term of the trajectory is shown to be very effective in case of tracking a trajectory of fast motion.View full abstractDownload PDF (793K) -
Kazunori YASUDA, Kazumasa HIRAI1981 Volume 17 Issue 4 Pages 473-478
Published: July 30, 1981
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSThis paper is concerned with the problem of stablizing a linear time-invariant system with time delay described by the differential-difference equation
S0: {x(t)=Ax(t)+Dx(t-h)+Bu(t), t≥0 x(t)=φ(t), t∈[-h, 0]
by means of a linear feedback without delay
u(t)=KTx(t)
Such a stabilization problem has been studied by many researchers and some sufficient conditions for S0 to be able to stabilized by the linear feedback has been derived. Classes of the system satisfing these conditions, however, seem to be restrictive considerably. The purpose of this paper is to broaden the class.
The obtained stabilizability condition is given as the structure of the matrix D to be satisfied when (A, B) is represented in Luenberger's cannonical form, which can give the same result as previous one as a special case.
The stabilization method provided here is applicable without knowledge the precise value of delay time.View full abstractDownload PDF (577K) -
Yahachiro TSUKAMOTO1981 Volume 17 Issue 4 Pages 479-484
Published: July 30, 1981
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSIn everyday life we sometimes encounter the vague statements whose truth status are neither true nor false. For developing the reasoning method using such vague information, the technique of Truth Qualification proposed by Zadeh is very important. This paper proposes new methods of Truth Qualification and its converse problem. We deal with the case in which the truth status associated with fuzzy propositions are given by numerical truth values rather than fuzzy truth values. Furthermore, with the use of the present method and the implication rule in Lukasiewicz logic, we formulate fuzzy reasoning methods for the cases corresponding to modus ponens and modus tollens of classical logic. The results obtained are satisfactory in view of normative criteria to be possessed by fuzzy reasoning. Also the present method is so simple that it is easy to give the intuitive interpretation to each process in fuzzy reasoning.View full abstractDownload PDF (809K) -
Yasuhiko TAKAHARA, Bunpei NAKANO, Jun-ici IIJIMA1981 Volume 17 Issue 4 Pages 485-491
Published: July 30, 1981
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSThe decomposition of a complex system is one of the very important problems of systems theory. In this paper we consider the following problem of the decomposition: Given a global system S⊂X×Y and a class of component subsystems {Si⊂Xi×Yi|i=1, 2, …, n}. Find a necessary and sufficient condition when there exists a complex systm representation S⊂S1×S2…×Sn such that S is related to S by surjective modelling morphism.
A surjective modelling morphism h: S→S yields an approximation of the global system S in some sense.
In the above problem the complex system representation S is not specialized but can be a general input output system. Problems of practical interest, however, usually require the complex system representation to satisfy some specific properties. As a corollary of the above cosideration, therefore, we also treat the case when the complex system representation S is a non-interactede system such that S=S1 ×S2×…×Sn·
Finally, as an illustration of the above result we discuss “Stair Case” game which is a typical problem-solving problem of artificial intelligence.View full abstractDownload PDF (908K) -
Tatsuya NAKAMURA1981 Volume 17 Issue 4 Pages 492-498
Published: July 30, 1981
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSIt is required that a picture image is processed in realtime for the position measurement of a robot vehicle. This paper describes the method which detects artificial patterns of slit code with high precision and speed. Slit codes are constructed by arranging slits so that the intervals among their center lines are of definite lengths. Detection of a slit code is done in two steps. In the first step, each slit pattern is detected by a finite automaton which inputs sampled data of two-valued image in the direction of the length. In the second step, the projective invariant of the visual angles among center lines of four neighbouring slits is computed from the slit pattern. If the invariant value is zero, then the pattern is accepted as a subsequence of a slit code. Otherwise they are rejected.
The detection method is implemented in a system which scans the robot's environment by a TV camera through a rotating periscope. The experiments show its high reliability, that is, it accepts slit codes and rejects other noise slit patterns. Also the system makes it possible to follow a specified slit of the slit code using the method of slit pattern detection, while the robot is moving. Thus visual feedback is attained.View full abstractDownload PDF (2553K) -
Hikaru YAMADA, Komyo KARIYA1981 Volume 17 Issue 4 Pages 499-505
Published: July 30, 1981
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSThe purpose of this paper is to present a new method to measure the amplitude probability density function (P.D.F.) of continuous random signals ro random pulses employing the analog-to-digital converters (A.D.C.): successive approximation type or multidiscriminator type. These type of A.D.C. are fast but with very poor channel width uniformity. The channel width inaccuracy is called differential non-linearity (D.N.L.), and is the most influential characteristic of A.D.C. in the measurement of P.D.F.. We have already established two methods to measure P.D.F. reducing the measurement error of P.D.F. due to D.N.L. (D.N.L. error).
In this paper, a new method to measure P.D.F. avoiding the growth of D.N.L. error using Fast Fourier Transform (F.F.T.) is proposed. In this method, the amplitude is transformed into the frequency of a sinusoidal wave. Then, the frequency corresponding to the maximum auto power spectrum of this sinusoidal wave gives correct amplitude avoiding the influence of D.N.L.. The experimental results are shown to demonstrate the feasibility of this method.View full abstractDownload PDF (1537K) -
Observation of Vortices Shedding from RingsMasaki TAKAMOTO, Kinichi KOMIYA1981 Volume 17 Issue 4 Pages 506-510
Published: July 30, 1981
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSThis paper is concerned with vortices shedding from rings, which can be expected to have many advantages as the bluff body of the vortex shedding flowmeter for the industry and the standard of the flow velocity.
Regarding patterns of vortices shedding from rings, d/w is thought to be the most dominant parameter by analogy with patterns of vortices shedding from two cylinders, where d is a mean diameter of the ring and w is a width of the ring. This supposition is confirmed by the observation of vortices shedding employed a flow visualization technique and a hot-wire anemometer, and it is also clarified that the most stable vortex rings shed from the ring which the diameter is 20mm d/w=6.1, and they are more stable than vortices from a plate. The sinusoidal detecting signal of vortices shedding, which is free from the effect of the turbulent shear layer, can be obtained by a hot-wire anemometer at the behind of the center of this ring. Althrough the Strouhal number slightly changes with the Reynolds number, as the velocity profile around the ring changes with the flow velocity, the repeatability of the frequency of the vortex to the flow velocity is within 0.1%.View full abstractDownload PDF (2442K) -
Yoshio SUZUKI1981 Volume 17 Issue 4 Pages 511-517
Published: July 30, 1981
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSThis paper deals with the dynamic analysis of a pneumatic circuit which consisted of an air micrometer with a“Ejector type nozzle”, which has the improved properties of the linearities and the frequency responses, and an output tube.
From the analytical results using a linearized lumped-parameter system model, it was yielded that the pneumatic micrometer circuit consisted of a frequency dependent output impeadance Z'g0;Zg0'=(Zgi, Zl=0+Z'n0)/{1+(Zgi, Zl=0/Z0g)(Zn0'/Z0g)}. Where Zn0'; the output impeadance of the “Ejector type nozzle”, Zgi, Zl=0 and Z0g; the input impeadance and the characteristic impeadance of the output tube for connecting the nozzle to the loads, respectively.
The dynamical experiments were made from 0.02Hz to 2kHz, when the moving plate opposite to the nozzle had been driven by a electro-magnetic accelerator. The values of Zg0' were calculated by means of a principle of the measurement based on Thevenin's theorem and its duality one. The experimental results agreed very well with the analytical ones of the pressure and the flow rate transfer characteristics, and the output impeadance of the pneumatic micrometer circuit with the “Ejector type nozzle”.View full abstractDownload PDF (1000K) -
Chikara SATO, Teruo MIYASHITA1981 Volume 17 Issue 4 Pages 518-523
Published: July 30, 1981
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSA gyro-two-wheel vehicle was designed, realized and experimented which stably stood during not only running but also stopping. A horizon sensor, a servomoter, a perpendicular gyroscope and electronic circuits were used in order to stabilize the vehicle, whose center of gravity was located at higher position than the supporting plane. After the stability condition was derived in the corresponding differential equations, the detailed structure was shown including mechanical feature, control system and horizon sensor. Finally experimental trajectories were shown to confirm the stability of the vehicle.View full abstractDownload PDF (1431K) -
Motoya KAMITORI, Hidenori KIMURA1981 Volume 17 Issue 4 Pages 524-525
Published: July 30, 1981
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSDownload PDF (229K) -
Katsutoshi SHIMIZU, Katsumi KAWAI, Takahiko ITO, Yuji HASHIMOTO, Masan ...1981 Volume 17 Issue 4 Pages 526-527
Published: July 30, 1981
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSDownload PDF (289K)
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