Transactions of the Society of Instrument and Control Engineers
Online ISSN : 1883-8189
Print ISSN : 0453-4654
ISSN-L : 0453-4654
Search
Advanced search
OR
Browse
Search
Volume 45, Issue 6
Displaying 1-7 of 7 articles from this issue
Show all abstracts
    • |<
    • <
    • 1
    • >
    • >|
Paper
Measurement
  • Vapor Leak Sensor Using Polarization Property and Stereoscopic Measurement for Plant Inspection
    Toshiro NAKASHIMA, Hajime NAKAJIMA, Osamu MATOBA
    2009 Volume 45 Issue 6 Pages 291-297
    Published: 2009
    Released on J-STAGE: November 03, 2011
    DOIhttps://doi.org/10.9746/sicetr.45.291
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    This paper reports a sensor for the plant inspections to detect leaking vapor. Plants are usually inspected by patrolling inspectors. It requires high level skills to selectively detect abnormal phenomena occurring in various types of equipment under the complicated environments. In this research, we developed a remote detecting sensor for the vapor leaking from piping, which is one of the priority control items inside plants. The basic principle of the sensor is specifically to sense the scattered light when laser beam is illuminated on the vapor. It is also discovered in our basic experiments that there is big difference in the polarization property between the light scattered by vapor and surface structures inside plants. The sensor can discriminate the light scattered by vapor from other types of scattered light utilizing the difference of the polarization property, then detecting the light scattered by vapor only. A prototype model is fabricated for substantiating the basic property of leaking vapor detection. As a result, it is confirmed that the prototype model not only has sufficient detecting capability, but can selectively detect vapor only. In conclusion, it is confirmed that the developed sensor satisfies the requirements for the plant inspection sensors, and has sufficient capability for practical usage.
    View full abstract
    Download PDF (1263K)
Control
  • Generalized Minimum Variance Control for Time-varying System
    —An Improvement of Noise Characteristic with a Direct Pseudocommutation Method—
    Masayoshi DOI, Yasuchika MORI
    2009 Volume 45 Issue 6 Pages 298-304
    Published: 2009
    Released on J-STAGE: November 03, 2011
    DOIhttps://doi.org/10.9746/sicetr.45.298
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    This paper describes a Generalized Minimum Variance Control(GMVC) sterategy for Time Varying System(TVS). GMVC is one of predict control methods, which are effective to Time Delay syatem. In TVS, polynoominals of model are noncommutativity. Then, the cost function can not be optimized with accuracy because noncommutative noise term remains. This paper applies a pseudocommutativity to improve the noncommutativity in TVS. The proposed pseudocommutativity has a durability against the effect of time shift of time varying multiplications. The GMVC sterategy holds a simple structure.
    View full abstract
    Download PDF (389K)
  • Temperature Control of RCA Cleaning Solutions via Model Switching Predictive Control Using First-difference Signals and Bagging CAN2
    Shuichi KUROGI, Yohei KOSHIYAMA, Hiroshi YUNO
    2009 Volume 45 Issue 6 Pages 305-312
    Published: 2009
    Released on J-STAGE: November 03, 2011
    DOIhttps://doi.org/10.9746/sicetr.45.305
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    The RCA cleaning method is the industry standard way for cleaning silicon wafers, and the temperature control is important for a stable cleaning performance. However, the difficulty lies in the fact that the RCA solutions cause nonlinear and time-varying exothermic chemical reactions. So far, the MSPC (model switching predictive controller) using the CAN2 (competitive associative net 2) has been developed and the effectiveness has been validated. However, we have observed that the control performance, such as the settling time and the overshoot, does not always improve with the increase of the number of learning iterations for the CAN2. To solve this problem, we introduce the bagging method for the CAN2 and first-difference signals for effectively embedding the bagging method. The effectiveness and the performance of the present method are examined by means of numerical experiments.
    View full abstract
    Download PDF (903K)
  • Tracking Performance Limitation for Plants with Input Delay in 2-DOF Internal Model Control Systems
    Hiroshi OKAJIMA, Toru ASAI, Shigeyasu KAWAJI
    2009 Volume 45 Issue 6 Pages 313-319
    Published: 2009
    Released on J-STAGE: November 03, 2011
    DOIhttps://doi.org/10.9746/sicetr.45.313
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    In this paper, tracking performance limitations for plants with input delay are considered. It is important to know the performance limitations for plants to design controllers and to design plants. Our objective is to find the fundamental limitation of the transient response in tracking control problem. When plant have input delay, no one would deny that tracking performance becomes worse than the plants without input delay. However performance limitations for such plants have not been derived analytically. We derive the performance limitations based on internal model control framework. The difference between plants with delay and without delay is compared by numerical examples.
    View full abstract
    Download PDF (578K)
  • 3D Attitude Near-optimal Control of a Space Robot of Two Rigid Bodies with Initial Angular Momentum
    Tatsuya KAI, Kazuho TAMAKI
    2009 Volume 45 Issue 6 Pages 320-326
    Published: 2009
    Released on J-STAGE: November 03, 2011
    DOIhttps://doi.org/10.9746/sicetr.45.320
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    This paper deals with a control problem for a space robot of two rigid bodies subject to initial angular momentum. We first give a model of a space robot with initial angular momentum, called the universal joint model. Next, we propose a near-optimal control method for nonlinear affine control systems based on the finite-dimensional Fourier basis, and show a near-optimal control algorithm. Then, we apply the near-optimal control algorithm to 3D attitude control of the universal joint model with initial angular momentum, and show some simulations to indicate the effectiveness of the proposed method.
    View full abstract
    Download PDF (552K)
Systems and Information
  • Design Method of Kernel for Sampling Rate Converter Using Block Structure
    Naoyuki AIKAWA, Yukio MORI
    2009 Volume 45 Issue 6 Pages 327-333
    Published: 2009
    Released on J-STAGE: November 03, 2011
    DOIhttps://doi.org/10.9746/sicetr.45.327
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    We present a kernel for sampling rate conversion based on Nth polynomials and ratio of each block. The proposed kernel is approximated a main robe of Sinc function by the Nth polynomial and side robes by the different Nth polynomial function and/or its amplitude ratio. The optimization of kernel is carried out by semidefinite programming (SDP). The proposed kernel has the advantage of not redesigning one whenever a sampling rate is changed. Moreover we present the kernel realized in the Farrow structure form. The usefulness of the proposed kernel is verified through examples.
    View full abstract
    Download PDF (813K)
Short Paper
    • |<
    • <
    • 1
    • >
    • >|
feedback
 Top