• Title/Summary/Keyword: Kumamoto model

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Two-degree-of-freedom control for descriptor system with disturbance

  • Yeu, Tae-Kyeong;Kawaji, Shigeyasu
    • 제어로봇시스템학회:학술대회논문집
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    • 2001.10a
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    • pp.151.2-151
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    • 2001
  • In this paper, the design of a two-degree-of-freedom(TDF) controller is proposed to track the reference model, as well as to reject an influence of measurable disturbance for descrpitor system. The TDF controllers based on the Youla parametrization reveals that the design of the feedforward controller and the regulator can be done independently. First, to solve this problem, we will change descriptor system into regular state space system using a state feedback. And then, the feedforward controller is determined by solving a full information approach for augmented system with a nominal control constraint, and the regulator is designed by means of the loop-Shaping method.

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An active vibration control system with state feedback

  • Iwai, Zenta;Ishitobi, Mitsuaki;Hino, Mitsushi
    • 제어로봇시스템학회:학술대회논문집
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    • 1989.10a
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    • pp.755-759
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    • 1989
  • This paper considers an active vibration control system based on pole placement incorporating the internal model principle when the system is subjected to disturbances which are generated by a linear dynamical system. Experimental results are presented which show the effectiveness of the method when the system is excited by a sine wave disturbance and system parameters are knwon. An adaptive control design is also discussed.

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A Design Method of Sliding Model Control System Using Parallel Ladder Network of Dynamic Compensators

  • Ohtsuka, Hirofumi;Iwai, Zenta;Mizumoto, Ikuro
    • 제어로봇시스템학회:학술대회논문집
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    • 2003.10a
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    • pp.1424-1429
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    • 2003
  • In this paper, the design method of sliding mode control (SMC) system for SISO linear system is discussed. First, we consider the similarity between the design method of sliding mode hyper plane using the strict positive realness and the characteristics of zeros of feedback system and the design method of simple adaptive control. Based on such a consideration, we propose the new design method of SMC system using parallel dynamic compensator. As a result, SMC system can be constructed only with the derivative of output signal for controlled plant. The performance of SMC system designed by proposed method is confirmed through the numerical example.

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A Practical Method for Identification of Nonlinear Chemical Processes by use of Volterra Kernel Model

  • Numata, Motoki;Kashiwagi, Hiroshi;Harada, Hiroshi
    • 제어로봇시스템학회:학술대회논문집
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    • 1999.10a
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    • pp.145-148
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    • 1999
  • It is known that Volterra kernel models can represent a wide variety of nonlinear chemical processes. Also, it is necessary for Volterra model identification to excite the process to be identified with a signal having wide range of frequency spectrum and high enough amplitude of input signals. Kashiwagi[4 ∼ 7] has recently shown a method for measuring Volterra kernels up to third order using pseudorandom M-sequence signals. However, in practice, since it is not always possible to apply such input sequences to the actual chemical plants. Even when we can apply such a pseudorandom signal to the process, it takes much time to obtain higher order Volterra kernels. Considering these problems, the authors propose here a new method for practical identification of Volterra kernels by use of approximate open differential equation (ODE) model and simple plant test. Simulation results are shown for verifying the usefulness of our method of identification of nonlinear chemical processes.

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Nonparametric Nonlinear Model Predictive Control

  • Kashiwagi, Hiroshi;Li, Yun
    • 제어로봇시스템학회:학술대회논문집
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    • 2003.10a
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    • pp.1443-1448
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    • 2003
  • Model Predictive Control (MPC) has recently found wide acceptance in industrial applications, but its potential has been much impounded by linear models due to the lack of a similarly accepted nonlinear modelling or data based technique. The authors have recently developed a new method for obtaining Volterra kernels of up to third order by use of pseudorandom M-sequence. By use of this method, nonparametric NMPC is derived in discrete-time using multi-dimensional convolution between plant data and Volterra kernel measurements. This approach is applied to an industrial polymerisation process using Volterra kernels of up to the third order. Results show that the nonparametric approach is very efficient and effective and considerably outperforms existing methods, while retaining the original data-based spirit and characteristics of linear MPC.

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Issues in Chinese prosody: conceptual foundations of a linguistically-motivated text-to-speech system for Mandarin

  • Lavin, Richard S.
    • Proceedings of the Korean Society for Language and Information Conference
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    • 2002.02a
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    • pp.259-270
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    • 2002
  • I examine various controversial aspects of Chinese prosody-tone structure, syllable structure, stress, and intonation-and stress the need to view all of these as interacting systems, aspects of a hierarchical prosodic structure. 1 examine various proposals at these various levels of the hierarchy and suggest which are most appropriate. Specifically, 1 suggest the adoption of Bao's version of syllable and tone, and Chen's account of stress. As for intonation, it is still not possible to make any definitive claims regarding an optimal model, but I examine work done by Kratochvil, Shih, and Carding et al, and suggest promising directions for future work.

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COMBINED FORWARD-BACKWARD EXTRUSION WITH REVERSE RAM MOTION -APPLICATION TO FORMING OF GEAR-

  • Otsu M.;Hayashida D.;Osakada K.;Hanami S.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2003.10b
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    • pp.158-161
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    • 2003
  • Extrusion of forward-gear and backward-rod by combined extrusion with controlling the extrusion velocity using a counter tool is studied. In the combined forward-backward extrusion with controlling extrusion velocity, only parts with short gear can be formed. To obtain longer gear parts, extrusion with reverse ram motion is carried out after the combined forward-backward extrusion process. In this method, combined forward-backward extrusion is carried out until excessive extrusion length is attained and then, the motion of the punch is stopped and the counter tool is moved in the inverse direction and returned to the position for obtaining the desired extrusion length. The experiment is carried out by using lead for billets as a model material. With reverse ram motion, longer gear teeth without under-filling defect can be formed than that by only combined extrusion with controlling extrusion velocity.

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COMBINED FORWARD-BACKWARD EXTRUSION WITH CONTROLLED REVERSAL RAM MOTION -Effect of Reversal Ram Motion-

  • Hanami S.;Matsumoto R.;Otsu M.;Osakada K.;Hayashida D.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2003.10b
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    • pp.162-166
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    • 2003
  • In combined forward-backward extrusion with controlled forward speed by a counter punch, accurate parts with forward rod can be formed. As an extension of this method, reverse extrusion is proposed, in which the extruded forward rod is pushed back while the main punch is kept at the final position after the forward-backward extrusion process. The experiment is carried out using lead as a model material. With the reverse extrusion method, longer forward rods can be formed without under-filling defect than that by combined extrusion with controlling extrusion speed.

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New horizon of earth reinforcement technique - current and future -

  • Otani, Jun
    • Proceedings of the Korean Geotechical Society Conference
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    • 2007.09a
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    • pp.514-527
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    • 2007
  • Earth reinforcement techniques are used worldwide and offer proven solutions to a wide range of geotechnical engineering problems. Here in this paper, recent developments of three major reinforced soil retaining wall methods in Japan were introduced in order to show how the current situation of this technique in Japan is. And the statistical data for the volume of the use was also shown, such as the total volume of the use, the scales of the structures, layout of the earth reinforcement, fill materials, and foundation conditions. Some of the case histories were also introduced with photographs and figures. And then, as one of recent research activity by the author, the study on the application of X-ray CT for the problem of earth reinforcement method combined with other method such as piling and soil improvement was introduced. In this study, a series of model test for several reinforced ground with geogrids was conducted using a newly developed test apparatus. Then, the behavior in the soil box was scanned after settlement using X-ray CT scanner. Based on these test results, the reinforcing effect by the geogrids and the soil arching effect over the pile heads was discussed precisely and those are done in 3-D with nondestructive condition. Finally, the effectiveness of the use of X-ray CT scanner in geotechnical engineering was promised.

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A Study on the Variation of HAA Precursors by Ozonation of Phenol (페놀의 오존 산화시 관찰된 HAA 전구물질 변화에 관한 연구)

  • Oh, Byung Soo;Kim, Kyoung Suk;Kang, Joon-Wun
    • Journal of Korean Society on Water Environment
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    • v.21 no.2
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    • pp.153-157
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    • 2005
  • The purpose of this study was to find out the effect of oxidation by-products for the formation of haloacetic acid (HAA) during ozonation. The phenol was used as a model precursor of HAA, and its oxidation by-products, such as hydroquinone, catechol, glyoxal, glyoxylic acid and oxalic acid were investigated to find out how much HAA formation potential (HAAFP) they have. As the result, among the phenol and its oxidation by-products, the highest reactivity with chlorine was found from the phenol, showing the highest HAAFP. Even though the tested by-products had a lower HAAFP than phenol, it was confirmed that all of them can act as the precursor of HAA. From the ozonation of phenol-containing water, it was found that the efficiency of ozone in controlling of HAAs can be reduced due to the oxidation by-products. In addition, the ozonation of HAAFP was performed under the both pH conditions (acid and base), and the result indicates that OH radical play a important role to decrease HAAFP.