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Volume 53, Issue 8
Displaying 1-8 of 8 articles from this issue
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Paper
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Akira KOJIMA, Kotaro HASHIKURA2017 Volume 53 Issue 8 Pages 425-436
Published: 2017
Released on J-STAGE: August 08, 2017
JOURNAL FREE ACCESSAn H∞ preview control problem is discussed for a system driven by uncertain preview information and a design method of control law is derived. Based on a state-space approach, a simplified solvability condition is derived by directly solving the coupled filtering/control operator Riccati equation. The features of the control law which overcome the uncertain future information are investigated and, in the numerical examples, the relation between the preview uncertainty and the resulting control performance is illustrated.View full abstractDownload PDF (703K) -
Masanori SHIOYA2017 Volume 53 Issue 8 Pages 437-447
Published: 2017
Released on J-STAGE: August 08, 2017
JOURNAL FREE ACCESSThis paper states the required functions for a Petri Net tool which can be applied to various logistics control problems. It is based on the experience gained by the development of a colored Petri Net tool which has been used to solve a lot of logistics control problems in steel processes for decades. This tool has many superior functions suitable for solving logistics control problems. Users can freely define the type of tokens which have some attributes, and can control the firing of the transitions by the attributes. This tool has a user-friendly GUI and can execute the Petri Net simulation in fast speed. Moreover, for analysis, it can convert the network to the system equations which express the basic structure of the Petri Net. This tool has been used to solve many logistics problems, such as AGV allocation control, hot-metal transportation control and so on.View full abstractDownload PDF (2191K) -
Fumitoshi SAKAI2017 Volume 53 Issue 8 Pages 448-454
Published: 2017
Released on J-STAGE: August 08, 2017
JOURNAL FREE ACCESSIn order to achieve high precision position tracking performances in positioning systems, the friction phenomena must be taken into consideration during the development of control algorithm. For effective compensation, the value of the friction force must be known in every domain of operation of the mechanical systems. This study presents a new identification method to obtain a continuous-time model of the mechanical systems with nonlinear friction. The method utilizes projection of measured signals onto a finite dimensional signal subspace. Its effectiveness is demonstrated through numerical example of a linear plant with nonlinear friction.View full abstractDownload PDF (1037K) -
Masayuki SATO2017 Volume 53 Issue 8 Pages 455-462
Published: 2017
Released on J-STAGE: August 08, 2017
JOURNAL FREE ACCESSH∞ controllers and their extensions, i.e., scaled H∞ controllers and controllers designed by µ-synthesis, are widely used for practical systems. H∞ controller design is formulated in terms of Linear Matrix Inequalities (LMIs) and the globally optimal controllers are easily designed; however, the design of scaled H∞ controllers and µ-synthesis are, in general, formulated in terms of Bilinear Matrix Inequalities (BMIs) and they require iterative algorithm (so-called D-K iteration) to obtain suitable controllers which are usually merely locally optimal controllers. The iterative procedure often stops due to its numerical instability and, in such a case, it is often the case that obtained controllers are not satisfactory with respect to design requirements. On this issue, we propose a design method in which observer-based output feedback controllers and constant scaling matrices are simultaneously optimized. Although the proposed method introduces some conservatism which comes from the structural constraints for the matrices introduced in so-called “dilation” procedure, numerical examples well demonstrate conservatism reduction thanks to the simultaneous optimization of controller gains and scaling matrices.View full abstractDownload PDF (724K) -
Ryo SATOUCHI, Yu KAWANO, Toshiyuki OHTSUKA2017 Volume 53 Issue 8 Pages 463-472
Published: 2017
Released on J-STAGE: August 08, 2017
JOURNAL FREE ACCESSWe propose a novel real-time pricing method for an electric power system based on model predictive control by the real-time optimization and estimation of a consumer's parameter using a particle filter. We also modify an existing control scheme for a thermal power plant and a battery to supplement price presentation. We conducted numerical simulations to compare the performance of our proposed method with that of the direct control scheme used in the previous research. We demonstrate that a supply-demand balance is achieved by price presentation in spite of a large fluctuation in wind power and the uncertainty in a consumer's parameter.View full abstractDownload PDF (1847K) -
Tatsuya YAMAGUCHI, Yukitaka SHINODA2017 Volume 53 Issue 8 Pages 473-479
Published: 2017
Released on J-STAGE: August 08, 2017
JOURNAL FREE ACCESSThe objective of this research is the construction of a high-speed and long-time strain measurement system that uses fiber Bragg grating (FBG) for determining health of structures. We constructed a high-speed and long-time measurement system that was accomplished by combining a FBG measurement system using wavelength swept laser and a data management system using database. This FBG measurement system was able to drive wavelength swept laser with sweep frequency of 20kHz and had a temporal resolution of 50µs. The data management system could manage the large volume of the data obtained from high-speed measurement. In this paper, we report on high-speed and long-time measurement for detecting instantaneous strain over 12 hours.View full abstractDownload PDF (1703K) -
Yuichi TADOKORO, Tatsuya IBUKI, Mitsuji SAMPEI2017 Volume 53 Issue 8 Pages 480-489
Published: 2017
Released on J-STAGE: August 08, 2017
JOURNAL FREE ACCESSThis paper tackles dynamic manipulability analysis and design optimization of a fully-actuated hexrotor unmanned aerial vehicle. First, a dynamical model of the hexrotor is presented. The model is then analyzed to prove that nonplanar hexrotor structure can be approximately simplified and transformed into planar rotor arrangement. Based on the fact, symmetric-coplanar-tilted-rotor (SCTR) structure is introduced as a kind of canonical structure of hexrotors. Moreover, dynamic manipulability measure (DMM) of the hexrotor is newly defined to analyze its maneuverability, and DMM of the hexrotor with SCTR structure is found suitable for performance evaluation of the structure. Finally, based on the analysis, a design optimization method for the hexrotor is presented, and numerical examples are shown.View full abstractDownload PDF (2864K)
Short Paper
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Toshiaki HIGO, Takahiro KAWAGUCHI, Shuichi ADACHI2017 Volume 53 Issue 8 Pages 490-492
Published: 2017
Released on J-STAGE: August 08, 2017
JOURNAL FREE ACCESSA system identification method for time-delay systems via discrete-time model is proposed. It is assumed that the time-delay is a non-integer multiple of the sampling period. We describe the discretization of such time-delay systems and propose a new interpretation for system identification. Single-input, single-output systems are interpreted as two-input, single-output systems: one represents system dynamics and the other is due to time-delay. Using this interpretation, we propose a system identification method, which estimates the parameters of each system separately. Finally we verify the effectiveness of the proposed method through numerical examples.View full abstractDownload PDF (329K)
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