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Volume 37, Issue 10
Displaying 1-15 of 15 articles from this issue
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Xinyu WANG, Shin LIU, Hiroyuki SHINODA2001 Volume 37 Issue 10 Pages 905-910
Published: October 31, 2001
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSWe propose a novel range finder composed of a point light source and a photodetector both of which are placed on a micro vibrator. The photodetector senses the reflected light intensity from the object surface and the amplitude of its fluctuation by the vibration. The distance is evaluated from the ratio of those two measured values. It is applicable to both a scattering surface and a mirror-like one, and it is stable against the dirt and the sensitivity fluctuation of the detector. Its expected applications range from medical treatment to new type of computer interface, such as a proximity sensor in minimally invasive surgery and a tongue motion sensor. The principle and experimental results using a prototype sensor are shown.View full abstractDownload PDF (3241K) -
Koichi KAMEOKA, Makoto NAKATANI2001 Volume 37 Issue 10 Pages 911-915
Published: October 31, 2001
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSThe combination weigher is composed of plural scales, which is used for obtained the best combination of the objects in mass. The combination weigher chosen as the subject in the study has a hardware configuration with a control criterion concerning the combined-mass itself. It is shown through computer simulation that the criterion improves well the accuracy of the best combination. In addition the determination procedure of the quantity to be prefilled in the weigh hoppers is made clear. By examining the runs in the combination processes, it is also clarified that the criterion has a merit of shorting the duration of the objects staying in the weigh hoppers.View full abstractDownload PDF (1140K) -
Kazuya KANDA, Tokuji OKADA, Kazuo ITO2001 Volume 37 Issue 10 Pages 916-925
Published: October 31, 2001
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSWe describe the detection method of shady objects which are unexpectedly mixed in kneaded food material while various kind of processings are given. It is difficult to detect nonmetallic mixtures like plastic, vinyl, seed, chip for their inconspicuous features, in general. Information of color, dielectric constant, reflection factor might be good characters for identifying them from the material. However, it is recommended to use appropriate information without any affect of these attributes of the mixtures as an ideal detection. Therefore we focused on the light transmittivity because the material has a tendency to diffuse light and produce shadows depending on the mixtures even when the object is nonmetallic. We devised a milky white hood having the cross angle π/3[rad] for illuminating the object so that the shadow becomes clear not at the material tip but at the place where the mixture exists. We show how the transmitted optical signals are processed. Experimental results are shown to prove the validity of the detection method.View full abstractDownload PDF (3001K) -
Kazuya KANDA, Tokuji OKADA, Kazuo ITO2001 Volume 37 Issue 10 Pages 926-933
Published: October 31, 2001
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSThis paper proposes an optical discrimination system for packed food quality. Raw material of the food is cereal. The material is powdered, baked, seasoned in general, and packed with transparent plastic film. Then, the food products are tested in their quality whether they are exact in number and appropriate in food sufficiency without lack, in addition to the check of unexpected mixtures. Our way of testing makes use of such optical characteristics of the food material in which light reflects, diffuses and then weakens depending on its thickness. We put photodiodes in the cylinder locating between ends of two belt conveyers. Of course, the cylinder has the shape keeping the flow of the food material consecutive. We define some thresholds and total area to evaluate the number and sufficiency of the piled food products, respectively. Also, formulation for estimating the area by signal processing is derived. For demonstrating the discrimination, the automatic test system is fabricated by combining mechanical and optical parts together. Experimental results show that the system works in real time, with high correctness of the discrimination.View full abstractDownload PDF (2279K) -
Ichijyo HODAKA, Masayuki SUZUKI2001 Volume 37 Issue 10 Pages 934-943
Published: October 31, 2001
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSThis paper considers an output feedback stabilization problem of nonlinear singularly perturbed systems via nonlinear singularly perturbed controllers. A necessary and sufficient condition for the stabilizability is obtained. When the state feedback with respect to the slow variable is possible, new stabilizing dynamic composite controllers are presented. The class of the controllers includes the existing static state composite control laws as a special case.View full abstractDownload PDF (1757K) -
Takashi MIYAZAKI, Shigeyuki HOSOE2001 Volume 37 Issue 10 Pages 944-953
Published: October 31, 2001
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSIn this paper a non-standard H∞ control problem is considered for a generalized plant represented by a descriptor form. This allows that the plant may have invariant zeros at infinity and non-proper. We use properties of a J-lossless matrix and a J-spectral factorization. It is shown that the solvability of the problem is equivalent to the solvability of two generalized Riccati equations. A parametrization is given for all compensators that are not necessarily proper. An existence condition of the proper controllers is considered.View full abstractDownload PDF (1590K) -
Eiichi MURAMATSU, Masao IKEDA2001 Volume 37 Issue 10 Pages 954-959
Published: October 31, 2001
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSA parameter estimation problem is considered for state equations of linear time-invariant systems. Under a certain condition, it is shown that the output of the system can be asymptotically described by a linear combination of output estimates which are generated by suitable multiple observers, where the parameters to be estimated appear as the weights of the linear combination. Using this property, a parameter estimation scheme is proposed.View full abstractDownload PDF (1321K) -
Hiroaki MUKAIDANI2001 Volume 37 Issue 10 Pages 960-969
Published: October 31, 2001
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSIn this paper, a new design method which is based on the reduced-order algebraic Riccati equations is proposed to construct a near-optimal controller of multimodeling systems. First the existence of a unique and bounded solution of an algebraic Riccati equation is investigated. Furthermore, its asymptotic structure is also established. Second a new near-optimal controller is obtained which does not depend on the values of the small parameters. Then, it is proven that the near-optimal control can achieve a performance which is O(||μ||) close to the optimal performance. Finally, in order to evaluate the cost functional, we also propose a new algorithm which is based on the fixed point algorithm for solving the multimodeling generalized algebraic Lyapunov equation.View full abstractDownload PDF (2267K) -
N.V.Q. HUNG, T. NARIKIYO, H.D. TUAN2001 Volume 37 Issue 10 Pages 970-978
Published: October 31, 2001
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSIn this paper, a dynamics-based adaptive control scheme is developed to achieve stability for teleoperation system and its transparency in the sense of motion/force tracking. The proposed scheme does not require either accurate dynamic parameters of manipulators or models of human operator and remote environment. Adaptive controllers are bilaterally designed for both master and slave sites to guarantee the stability of whole system and performance of motion tracking. Especially, the concept of a virtual master manipulator is introduced to obtain the convergence to zero of force tracking error. The validity of the proposed control scheme and its advantages of control performances over conventional impedance matching control are confirmed by numerical simulations and experiments.View full abstractDownload PDF (2295K) -
Ryosuke HOSAKA2001 Volume 37 Issue 10 Pages 979-986
Published: October 31, 2001
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSA new type electronic warning sign in public space for blind is proposed in this paper. The new sign is constructed by LF band RFID sensor and its marker. RFID is a sort of small sized beacon system. The marker have no battery. The marker is operated by energy of received signal from the sensor. In this method, the RFID marker is buried under end of walkway. The RFID sensor is set into a cane for blind. If the blind approach to the end of walkway, an information communication is occurs between the marker and the sensor. The blind is able to get warning information from the sensor in the cane, since the situation information is transmitted to the sensor from the marker. Using the method, the blind is protected from some accidents at the end of walkway.View full abstractDownload PDF (5555K) -
Yoshiaki SUZUKI, Takashi SUZUKI, Keietsu ITAMIYA2001 Volume 37 Issue 10 Pages 987-989
Published: October 31, 2001
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSThis paper discusses the differences of two methods for rejecting deterministic disturbances in model reference control system regarding the transient properties and the robustness to unmodeled dynamics. The results are easily applicable to the adaptive control system.View full abstractDownload PDF (445K) -
Kiyoharu TAGAWA, Hiroki TAKAMI, Koichi SHIRAKI, Hiromasa HANEDA2001 Volume 37 Issue 10 Pages 990-992
Published: October 31, 2001
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSThe inverse kinematics of redundant arms is formulated as a constrained optimization problem, where the configuration of the arm is optimized for decoupling its endpoint compliance matrix as much as possible. Then a global optimization method using the interval analysis is presented for solving the problem. Experimental results demonstrate the characteristic of the proposed method and also exhibit the best configuration of a redundant arm engaged in the Peg-in-Hole task.View full abstractDownload PDF (451K) -
Shujiro SAWAI2001 Volume 37 Issue 10 Pages 993-995
Published: October 31, 2001
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSSpacecraft are often spin stabilized at their launch. At such cases, nutation motion may affect the mission success directly. So, estimation of nutation divergence via liquid propellant is a matter of interest. At the same time, the estimation is not necessarily rigorous. Instead of estimating the precise dynamics of the nutation, this study concentrates on the estimation of the worst value of nutation motion. In most missions, nutation motion does not need to be estimated exactly, but it is extremely important to assure the worst value of nutation divergence. This paper treats the nutation divergence via liquid propellant in tanks and proposes the way to estimate the worst value of nutation divergence time constant. This approach may be conservative, but still it can be adopted to wide variety of missions.View full abstractDownload PDF (526K) -
Masaya SEKIMOTO, Sumitoshi OGATA2001 Volume 37 Issue 10 Pages 996-998
Published: October 31, 2001
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSIn this paper, we focus on the job processing capacity of a multi task operating system using a queuing theory. We show that the extended CPU model can generate signals with much uniform fractal structure than the previous one, and that these fractal signals are not Brownian.View full abstractDownload PDF (514K) -
Zhao YONG, Nobuo SANNOMIYA2001 Volume 37 Issue 10 Pages 999-1001
Published: October 31, 2001
Released on J-STAGE: March 27, 2009
JOURNAL FREE ACCESSA genetic algorithm is proposed to obtain dead-lock free schedules for no-buffer jobshop scheduling problems. As the main contribution of this research, the proposal of a new decoding method ensuring no violation of no-buffer constraints enables genetic algorithms to handle the no-buffer jobshops. Experiment results on some modified benchmark problems show that the proposed algorithm obtains equivalent or better schedules than those given by available literature.View full abstractDownload PDF (437K)
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