All issues
Volume 44, Issue 7
Displaying 1-10 of 10 articles from this issue
- |<
- <
- 1
- >
- >|
-
Shogo TANAKA, Yoshiyuki TAKAHASHI2008 Volume 44 Issue 7 Pages 545-551
Published: July 31, 2008
Released on J-STAGE: February 25, 2013
JOURNAL FREE ACCESSThe present paper considers an optimal electromagnetic coupling device which improves the incidence efficiency of electromagnetic wave into the inspected objects when an electromagnetic wave radar is used for non-destructive inspection. Concretely, the paper proposes a moist multi-string type coupling device attached to the bottom of the radar. The coupling device enables the radar move fast over the inspected object without causing any damage to the radar, and consequently realizes a fast and reliable non-destructive inspection of anomalies in inspected objects.View full abstractDownload PDF (7820K) -
Tokio HAMADA2008 Volume 44 Issue 7 Pages 552-557
Published: July 31, 2008
Released on J-STAGE: February 25, 2013
JOURNAL FREE ACCESSIt is well known that the platinum based thermocouples E. M. F. drifts by exposing at high temperatures. The drift occurs by the vapor of the elements mainly, i.e. a branch element vapors and piles up another element. The phenomenon brings the rhodium content difference between each branch smaller. So that the E. M. F. becomes more and more small. In the present study, the amount of the E. M. F. drift is estimated by the rhodium contents analysis and it is compared with the experimentally measured value. Both of the result shows the relatively good agreement. The method will be useful at least in the glass melting industry.View full abstractDownload PDF (7934K) -
Kenji KASHIMA, Kazunori NISHIO2008 Volume 44 Issue 7 Pages 558-565
Published: July 31, 2008
Released on J-STAGE: February 25, 2013
JOURNAL FREE ACCESSIn this paper, feedback control of quantum spin systems is investigated. The quantum control scenario follows the formalism of continuous quantum measurement and quantum state estimation using the so-called stochastic master equation. In quantum feedback control implementations the state estimation is delayed, which is known to degrade the resulting control performance. As yet there are no theoretical means to take such estimation delays into consideration. In this paper we derive a stabilizing control law for two-dimensional quantum spin systems taking estimation delays into explicit account. From a control theoretic viewpoint, the obtained result is a delay-dependent stability criterion for a nonlinear stochastic switching system.View full abstractDownload PDF (11016K) -
Hiroshi OKAJIMA, Toru ASAI, Shigeyasu KAWAJI2008 Volume 44 Issue 7 Pages 566-574
Published: July 31, 2008
Released on J-STAGE: February 25, 2013
JOURNAL FREE ACCESSPath following control problem has been treated in recent years. In past studies, the velocity of the plant is considered as constant value. However, the velocity of the plant must be controlled so as to reduce traveling time. In this paper, velocity control in path following problem is discussed by using optimal control. Since reaching time from the start point to the terminal point is used as a cost, we can obtain good acceleration and deceleration input. Since constraints of path following are included in the optimal control problem, we can achieve not only optimization of the cost but also path following. The effectiveness of the proposed method is examined by numerical examples with a path of non-constant curvature.View full abstractDownload PDF (5222K) -
Stability Theory Based on PassivityKiyotaka SHIMIZU2008 Volume 44 Issue 7 Pages 575-582
Published: July 31, 2008
Released on J-STAGE: February 25, 2013
JOURNAL FREE ACCESSThis paper is concerned with P·SPR·D control of affine nonlinear system and the Lagrangean system which are passive system. P·SPR·D control consists of proportional (P) action + strict positive real (SPR) action + derivative (D) action. Such control can asymptotically stabilize the affine nonlinear system being of multi input and multi output. Further a set-point servo problem (a set-point tracking control) for the Lagrangean system is also solved by the P·SPR·D control. Stability analysis of P·SPR·D control is made, based on the passivity theory and LaSalle's invariance principle. P·SPR·D control is applied to an inverted pendulum. We swing up the pendulum by the Direct Graient Descent Control at the first stage, and then switch to the P·SPR·D control in order to stabilize it at the upright position. The effectiveness of the proposed method is demonstrated by the simulation results.View full abstractDownload PDF (4598K) -
Kenichi TAMURA, Hiromitsu OHMORI2008 Volume 44 Issue 7 Pages 583-591
Published: July 31, 2008
Released on J-STAGE: February 25, 2013
JOURNAL FREE ACCESSThis paper is concerned with an adaptive PID control for the servo problem of MIMO systems {A, B, C} whoseA, B, Care unknown matrices in the presence of the constant disturbance. We propose the new adaptive two-degree of freedom PID controller that has the both constant matrices gain and adjusting gain matrices. The proposed design method is derived from satisfying Lyapunov's stability theorem under some assumptions that the controlled system's zero-dynamics is asymptotically stable, some rank conditions concerning the controlled system and the reference model matrices andCB=0,CAB>0 orCB>0. In our method, the asymptotic output tracking can be guaranteed even if there exist unknown system parameters and unknown constant disturbances. Finally, the effectiveness of the proposed method is confirmed with the simulation results for the 8-state, 2-input and 2-output system.View full abstractDownload PDF (4461K) -
Shun-ichi AKAMA, Koji TSUMURA2008 Volume 44 Issue 7 Pages 592-599
Published: July 31, 2008
Released on J-STAGE: February 25, 2013
JOURNAL FREE ACCESSThis paper proposes an adaptive controller for an unknown discrete linear time invariant system via lossy communications, and analyzes stability of the control system. Difficulties are derived from the lossy communications: the controller can not observe a whole plant output, and a plant input might be different from what the controller intends to input. This paper shows that the proposed adaptive controller will ensure a bounded error tracking for the control system.View full abstractDownload PDF (12145K) -
Real-time Representatioin of Destruction Process Considering Interaction between Two Virtual ObjectsSatoru HONMA, Hidetoshi WAKAMATSU2008 Volume 44 Issue 7 Pages 600-608
Published: July 31, 2008
Released on J-STAGE: February 25, 2013
JOURNAL FREE ACCESSVirtual objects have been synthesized based on physical phenomena using various kinds of techniques in artificial reality. In most cases, the calculation decreases owing to some kinds of simplified models and/or reduction of their composing elements, by which their drawing of shapes is easily performed in a higher speed. However, the deformation of virtual objects beyond their elastic limit has not been conventionally considered. Thus, it is necessary to take into account plasticity as well as elasticity and viscosity for more accurate representation of dynamical deformation process of materials, for which a new coefficient for positional relation of masses is proposed to represent the various dynamical action of the objects. That is, their interaction is mathematically formulated to simulate their actual action and reaction on the basis of their physical relation. Thus, a virtual object of elasto-visco-plastic model can be applied for the real-time dynamical presentation of the deformation and destruction such as “Crack”, “Collapse” and “Smash”.View full abstractDownload PDF (12575K) -
Kentaro KUSADA2008 Volume 44 Issue 7 Pages 609-610
Published: July 31, 2008
Released on J-STAGE: February 25, 2013
JOURNAL FREE ACCESSIt is well known that corrosion of a ship body makes UEP (underwater electric potential) generate around the ship. UEP can be measured by a pair of two electrodes. We use UEP signals to detect naval vessels; however, UEP noises in the sea disturb precise detection. Therefore we investigate UEP noises using with two systems which have several UEP senants.View full abstractDownload PDF (3993K) -
Takahiko MORI, Katsuhiko FUWA, Yoshifumi MORITA, Hisashi KANDO2008 Volume 44 Issue 7 Pages 611-613
Published: July 31, 2008
Released on J-STAGE: February 25, 2013
JOURNAL FREE ACCESSWe propose a new design method of frequency dependent optimal servo system for the positioning of flexible structures. Some results of experiments are given in order to verify the usefulness of our method.View full abstractDownload PDF (443K)
- |<
- <
- 1
- >
- >|