All issues
Volume 20, Issue 8
Displaying 1-16 of 16 articles from this issue
- |<
- <
- 1
- >
- >|
-
Shigeru URIKURA, Akira NAGATA1984 Volume 20 Issue 8 Pages 671-676
Published: August 30, 1984
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSThe problems of a follow up control of system output to the reference generated by an external signal model, or an output regulation under the disturbance generated by such as model, can be treated with an augmented state space model that consists of the plant and the external signal model.
This paper considers the solution of a dead beat output regulator problem of a linear time-invariant discrete-time system of which state space is one of such as the augmented. The main conclusions are described in Theorem 2. Those are, the solvability conditions and the solutions of such problem are strongly connected with the results for the problem of the dead beat output regulation of the plant to zero reference, however there are nonzero reference or nonzero disturbance.View full abstractDownload PDF (690K) -
Kazuo AIDA1984 Volume 20 Issue 8 Pages 677-684
Published: August 30, 1984
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSIn this paper a procedure for designing a multivariable control system to track a polynomialtype reference input.
The optimal state feedback gains for augmented system incorporating integrators are designed using the usual linear regulator technique. The added feedforward control loops for the reference input and initial state variables are designed using another time-multiplied performance index.
This control system has faster response and shorter settling time than that with only feedback control loops. Moreover we can prevent reset windup even if the control signal exceeds the upper or lower bounds of the actuator. An illustrative example demonstrates the efficiencies of this control system.View full abstractDownload PDF (911K) -
Shigenori OKUBO1984 Volume 20 Issue 8 Pages 685-690
Published: August 30, 1984
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSModel reference adaptive control systems (MRACS) have been developed in order to solve several weak points of the design by modern control theory, though there are many constraints in MRACS yet. This paper describes the design of MRACS with unknown disturbances and improvement of transient responses. The disturbances are piecewise polynomial function of time, the degree (nd-1) is known, and the coefficients are unknown. This designed MRACS can eliminate the influence of disturbances and let output error be zero stably by increasing the degree of state variable filters. Frequently the responses of MRACS contain impulse functions. One of the cause is that the degree of numerator is less than the degree of denominator of the strictly positive real transfer function W(P). In this paper we show that the transient responses can be improved when the two degrees of numerator and denominator are same.View full abstractDownload PDF (697K) -
Shinji HARA1984 Volume 20 Issue 8 Pages 691-697
Published: August 30, 1984
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSWe must take account of sensitivity and robust stability for parameter perturbations, characteristics of responses to reference commands, and performances of disturbance and sensor noise rejection, in control system design. This paper compares PID type control systems with I-PD type control systems from these view-points. The following properties are derived under some reasonable assumptions of the given plants and the designed controllers: 1) PID type controllers have superior characteristics with respect to robust stability, output sensor noise rejection, and rapidity of responses to reference commands; 2) Low sensitivity and good disturbance and error sensor noise attenuation can be realized by small control input in I-PD type control systems. It is also shown that the characteristics of PI-PD control systems lie between those of PID and I-PD type control systems. Guidances for controller design are proposed based on these quantative properties. A simple numerical example certifies these results.View full abstractDownload PDF (888K) -
Kageo AKIZUKI, Osamu YOSHIE, Tetsuya MASUISHI1984 Volume 20 Issue 8 Pages 698-703
Published: August 30, 1984
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSThis paper deals with design of IFIR (Integrated Finite Impulse Response) control systems. Considering recent development of the CAD (Computer Aided Design) for control systems such kind of an algorithm is efficient that has the necessity of checking the result of design but requires little amount of computational time.
The proposed algorithm in this paper has such a desired characteristic.
The technique is to minimize the error of approximation that is, least mean square approximation. This design technique requires considerably a little calculation and is competent to design control system changing the desired model and the order of the controller. The extension of this algorithm to multivariable system is also provided. The efficiency of this algorithm is demonstrated via some examples.View full abstractDownload PDF (638K) -
Makoto KATOH, Hideaki KANOH1984 Volume 20 Issue 8 Pages 704-711
Published: August 30, 1984
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSA model reference adaptive control scheme for multi-input multi-output discrete polynomic non-linear systems with input and output time delays and containing unknown parameters linearly is derived by using Lyapunov method.
To contain unknown parameters linearly in the plant model makes the adaptive law a very simple one in structure and an easy one to compute.
A predictor is constructed to estimate future output errors needed in the construction of control law for the presence of time delays. The estimation of a higher order output error is obtained from the estimation of the first order form of the output error by using a transformation matrix. This technique of the transformation is needed to treat with the polynomic non-linear systems.
It is shown that the output errors converge to zero if the input and the output of the closed loop system are bounded and that the parameter errors converge to zero if the plant is strictly identifiable.
Digital simulation of the Volterra's prey-predator system confirms that this discrete adaptive control scheme is useful even for continuous systems with input and output time delays as long as the sampling time is ade-quatly small.View full abstractDownload PDF (895K) -
Eitaro AIYOSHI, Kiyotaka SHIMIZU1984 Volume 20 Issue 8 Pages 712-719
Published: August 30, 1984
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSThis paper presents a new method for solving two-level optimization problems by adopting the concepts of an interior penalty method. The two-level optimization problem is outlined as follows: The two-level optimization problem is composed of an upper and a lower level. The upper level determines the optimal value of an unknown parameter contained in the lower level which takes the form of a usual optimization problem, based on upper objective and constraint functions, while the lower level problem can be solved under the parameter assigned by the upper level. Furthermore the determination of the parameter is performed by considering of the optimal solution to the lower level corresponding to the parameter. The problem mentioned above cannot be solved by ordinary mathematical programming techniques.
In this paper, augmented objective functions are introduced first, by which the objective function is combined with the constraint function, in the upper and the lower levels, respectively. Through this approach, the constrained two-level problem is trans-formed into an unconstrained two-level problem, which is solvable by means of unconstrained optimization techniques. It can then be proved that the solution to the original two-level problem can be obtained as an accumulation point of a sequence of solutions to the transformed problems, when the penalty parameters are updated in the upper and lower levels simultaneously. This new method is more efficient and applicable than the other penalty approach proposed previously in Ref. 9).View full abstractDownload PDF (1115K) -
Tsukasa YAMAZAKI, Michio SUGENO1984 Volume 20 Issue 8 Pages 720-726
Published: August 30, 1984
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSA self-organising fuzzy controller (SOC for short) is a heuristic rule-based controller and a further extension of an ordinary fuzzy con troller which was first introduced by Assilian and Mamdani. This has a hierachy structure which consists of an algorithm being identical to a fuzzy controller at the lower loop and a learning algorithm accommodating the performance evalution and rule modification function at the upper loop.
In this paper, the latest version of SOC, which overcomes earlier problems such as cycling phenomena of control response, poor settling time and inefficient learning of control rules, is mainly described. The inferrence method adopted in SOC is first discussed to give the theoretical basis which will be expedient for the exposition to follow. The configuration of the latest algorithm of SOC is explained along with the six main blocks into which SOC can be divided from a functional point of view, in particular, placing an emphasis on the learning algorithm.
A guide-line for the optimal setting of controller parameters to be ajusted in SOC has been derived from a semantic approach and confirmed experimentally. The result has revealed an interesting property of SOC that the parameters are insensitive to those of a control object unlike a PI controller.
Two control responses of SISO and MIMO process are illustrated for the purpose of demonstrating the control performance of SOC and the guide-line for the optimisation.View full abstractDownload PDF (893K) -
Yuzo OKA, Yajiro MORITA1984 Volume 20 Issue 8 Pages 727-733
Published: August 30, 1984
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSThis paper deals with the structural modelling of a set whose elements have no transitivity of order relationship in their binary paired-comparison. When we connot give a linear order structure to the given set, i. e., when the set has a cycle, we need some new concepts to analyze and understand the structure of the set. Such concepts as the extended fundamental pattern, the pseudo-interval order and so forth have been proposed by the authors to represent the cycle systematically. The classification of the set can now be discussed by them.
This paper defines the generalized pseudo-interval order and states that the classification algorithm derived from it gives a finer classification of the set than that derived from the pseudo-interval order. The paper also states that we can obtain the two modelling methods: one is to obtain a transitive structural model derived from the pseudo-interval order and the other is to obtain a hierarchical structural model derived from the generalized pseudo-interval order.View full abstractDownload PDF (966K) -
Hisashi TSURUOKA, Tadao KANEKO, Masamoto TAKATSUJI1984 Volume 20 Issue 8 Pages 734-739
Published: August 30, 1984
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSLighting design for a 3-dimensional plant factory Methods of designing lighting for 3-dimensional plant factories in which plants are cultivated by artificial light are discussed. Moving through the 3-dimensional light lattice, plants in factory of this type grow. Plants periodically approach to lamps and all leaves get light radiation from various directions. Therefore lighting environment of 3-dimensional plant factory is very complex.
Then a lighting design method is developed by the use of a model facility. First, direct incident illuminance is caluculated using the light distribution diagram for a lamp. Next, the reflected illuminance and transmitted illuminance are experimentally determined from the values of the design parameters (trough dimensions, distance between troughs, plant weight, etc). These illuminances are added to the direct incident illuminance. Finally, total illuminance is converted into effective illuminance using experimental results obtained by comparison of plants growing in 2-dimensional illuminance with those in 3-dimensional illuminance.View full abstractDownload PDF (728K) -
Koin KAWAMURA, Toshiyuki TANIGUCHI, Fumitoshi NOTO1984 Volume 20 Issue 8 Pages 740-746
Published: August 30, 1984
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSTracking has been defined as the formation of a carbonized conducting path across the surface of an insulating material between electrodes maintained at a potential difference.
In Japan, polyvinyl chloride resin is widely used as an insulation for distribution cable (F-cable) in the home runs. The F-cable would sometimes be ignited by an arc which occurs between deposited carbon caused by heat of a scintillation discharge and electric wire under conditions of moisture, salt fog or dust.
There has been many recent studies of protection method of electric ignition caused by tracking failure on F-cable, however, no satisfactory solutions seem available as yet.
In this paper, in order to develop the electric protection system which makes a correct dia gnosis of tracking trouble at plural precaution lines, the detection equipment which corresponds to tracking trouble at the precaution lines of 8 branch-circuits was designed, and the trial manufacture equipment was proposed as the convenient method. As the same time, in order to evaluate the tracking failure of F-cable, a new evaluation method which integrates the load current and the tracking current with respect to time by using a microcomputer was proposed.
As the results obtained by the responce confirmation test method resembling the IEC (International Electrotechnical Commission) tracking test, the authors confirmed that the present system responded to current signals in the tracking failure under a load or no load. On the other hand, the evaluation method of tracking failure by using the current integration by parts was confirmed as an effectual method for practical use.View full abstractDownload PDF (2140K) -
Koji ITO, Toshio TSUJI, Yuko TAKENE, Mitsuo NAGAMACHI1984 Volume 20 Issue 8 Pages 747-753
Published: August 30, 1984
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSIn human-prosthesis systems, the signals must be transmitted through the functions remained in the amputee. Therefore, the amputee's ability of information transmission is largely restricted and it seems that the control ability may be inferior to the one in regular man-machine systems. It is important to identify human operator's control strategy and to clarify the limit of control ability under the restricted conditions for the development of powered prosthesis.
The purpose of this paper is to analyze human operator's control characteristics in man-machine systems controlled by quantized EMG signal. Human operator was asked to compensate a random input by manipulating quantized EMG signal with five states. First, human operator's describing functions were estimated from the experiments and it was shown that the gain characteristics became worse than the ones in regular man-machine systems. Then, human operator's switching behavior was analyzed and it was represented that the nonlinear property of the human operator led to the reduction of the gain characteristics.View full abstractDownload PDF (960K) -
Toshiro NORITSUGU1984 Volume 20 Issue 8 Pages 754-761
Published: August 30, 1984
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSThe precice and flexible motion control has been recently required for also the pneumatic driving mechanism. Some types of electro-pneumatic servo system which enable the continuous position control by means of the servo or proportional valve have been provided. However such valves contain the disadvantages to be expensive and extremely sensitive to a dust in the operating air.
In this study, the PWM mode electro-pneumatic servo system is proposed in which the position of piston is controlled by the PWM driving an on-off two way valve. The control system is constructed by use of inexpensive automobile-type fuel injection valves as the valve driven in the PWM mode. The characteristics and performance of the system are analyzed and discussed to obtain the following results.
1) The theoretical model of pneumatic driving part and the method of identification of system parameters (friction, damping ratio, etc.) based on the static characteristics are given.
2) The influence of sliding friction on the position control performance is clarified, and proved the effectiveness of Coulomb friction to stabilize the response and to rapidly stop a piston.
3) The proposed system can provide the enough satisfactory performance for the usual application of the pneumatic driving. The trial system can realize the repetitive positioning precision, ±0.06mm.
This control manner has the advantage in which the PWM valve with so large cross section is not required because the PWM mode is adapted only in the vicinity of desired position.View full abstractDownload PDF (974K) -
Atsunobu ICHIKAWA, Kunihiko HIRAISHI1984 Volume 20 Issue 8 Pages 762-764
Published: August 30, 1984
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSDownload PDF (349K) -
Takashi SUZUKI, Kanya TANAKA1984 Volume 20 Issue 8 Pages 765-767
Published: August 30, 1984
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSDownload PDF (381K) -
Kamekichi SHIBA, Tadashi ICHINOSE, Jin-ichi KITAMURA1984 Volume 20 Issue 8 Pages 768-770
Published: August 30, 1984
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSDownload PDF (351K)
- |<
- <
- 1
- >
- >|