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15th World Congress of the International Federation of Automatic Control, 2002

作者： Kumamaru, Kousuke Kamata, Haruyoshi Inoue, Katsuhiro Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology Kawazu 680-4 Iizuka Fukuoka820-8502 Japan

ISBN: (纸本)9783902661746

The paper is concerned with a method of identification-based fault diagnosis for nonlinear continuous-time dynamic systems. A quick identification method is introduced in order to monitor online physical parameters specifying fault modes in the system. A decentralized fault diagnosis system which can accommodate for complex fault modes due to multi-simultaneous changes in system parameters is proposed based on the quick identification method. The effectiveness of the method has been confirmed through simulation studies on a ship propulsion system constructed as a standard model for benchmark test of fault diagnosis. Copyright © 2002 IFAC.

关键词： Fault detection

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A high-throughput pipelined architecture for blind adaptive equalizer with minimum latency

A high-throughput pipelined architecture for blind adaptive ...

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Midwest Symposium on Circuits and systems (MWSCAS)

作者： M. Mizuno K. Ueda J. Okello H. Ochi Faculty of Computer Science and System Engineering Kyushu Institute of Technology Iizuka Japan

In this paper, we propose a pipelining architecture for the FIR portion of the multilevel modified constant modulus algorithm (MMCMA). We also provide the correction factor that mathematically converts the proposed pipelined adaptive equalizer into an equivalent non-pipelined conventional MMCMA based equalizer. The proposed pipeline method uses modules with 6 filter coefficients, resulting in an overall latency of a single sampling period along the main transmission line. The basic concepts of the proposed architecture is to implement the FIR filter and the algorithm portion of the equalizer such that the critical path has one complex multiplier and two adders.

关键词： Blind equalizers Adaptive equalizers Delay Finite impulse response filter Pipeline processing Convergence Quadrature amplitude modulation Throughput Signal restoration computer architecture

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Identification and adaptive control of super heater system based on quasi-ARMAX model 15th

Identification and adaptive control of super heater system b...

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15th World Congress of the International Federation of Automatic Control, 2002

作者： Inoue, Katsuhiro Kumamaru, Kousuke Inoue, Hiroshi Inoue, Takashi Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology Kawazu Iiduka Fukuoka680-4 Japan

ISBN: (纸本)9783902661746

In this paper, a scheme to identification and control is proposed for main-steam temperature raising in a super heater system of thermal power plant. When modeling the system, a quasi-ARMAX model is effectively used by considering an appropriate treatment of external inputs in the super heater system. Then the validity of constructed model is verified through identification tests. In particular, it is found that the model validity becomes more evident for the high nonlinear case. Finally, an adaptive control system for main-steam temperature raising is designed based on a nonlinear predictor model in the framework of linear stochastic control theory. Copyright © 2002 IFAC.

关键词： Adaptive control systems

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FAULT DIAGNOSIS OF DYNAMIC systemS BY USING A QUICK IDENTIFICATION METHOD AND ITS APPLICATION TO SHIP PROPULSION system

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IFAC Proceedings Volumes 2002年第1期35卷 233-238页

作者： Kousuke Kumamaru Haruyoshi Kamata Katsuhiro Inoue Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology Kawazu 680-4 Iizuka 820-8502 Fukuoka Japan

关键词： Continuous-time system model-based fault diagnosis non-linear system parameter estimation quick identification

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Vector velocimetry by using fiber-optic low coherence interferometers

Vector velocimetry by using fiber-optic low coherence interf...

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Optical Fiber Sensors Conference

作者： Y. Imai K. Tanaka Department of Computer Science and Electronics Kyushu Institute of Technology Iizuka-shi Fukuoka-ken Japan Department of Mechanical System Engineering Kyushu Institute of Technology Iizuka-shi Fukuoka-ken Japan

A new velocimetry using the four probing points system consisting of fiber-optic low-coherence interferometers are proposed and demonstrated. The proposed velocimetry is capable of measuring simultaneously the 3-D velocity vector (absolute velocity and the velocity direction). The velocity vector distribution along depth can also be measured in the present method by scanning the mirror positions in the reference arms. Moreover, the 3-D velocity vector distribution can be measured by sweeping the mirror position for z-direction distribution and by moving the fiber probes for x- and y-direction distribution. The high spatial resolution of the present method enables us to apply the present method to sensing for velocity vector distributions of a boundary layer in liquid flow or of a vortex flow, and of a living body, which are very important in the field of fluid mechanics and the practical application. It is very difficult in conventional methods to measure the velocity vector in these application areas.

关键词： Interferometers Interference Coherence Optical scattering Light scattering Particle scattering Signal processing Optical interferometry Probes Velocity measurement

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Intelligent diagnosis method for plant machinery using wavelet transform, genetic programming and possibility theory

Intelligent diagnosis method for plant machinery using wavel...

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IEEE Region 10 International Conference TENCON

作者： Peng Chen T. Horie T. Toyota Zhengjia He Faculty of Computer Science and System Engineering Kyushu Institute of Technology Iizuka Fukuoka Japan Japan Condition Diagnosis Technology Laboratory Incorporated Kitakyushu Japan Department of Mechanical Engineering Xi‘an Jiaotong University Xi‘an China

This paper proposes an intelligent diagnosis method for plant machinery using wavelet transform (WT) genetic programming (GP) and possibility theory. The WT is used to extract feature spectra of each machine state from measured vibration signal for distinguishing faults. Excellent symptom parameters (SP) for detecting fault states are automatically generated by GP. The membership functions of symptom parameters are established using possibility theory for resolving the ambiguous diagnosis problems. The methods proposed in this paper are verified by applying them to the fault diagnosis of gear equipment.

关键词： Machine intelligence Machinery Wavelet transforms Genetic programming Possibility theory Vibration measurement Fault diagnosis Feature extraction Fault detection Signal resolution

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Effect of filament sausaging on current-voltage characteristics in a superconducting Bi-2223 tape

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AIP Conference Proceedings 2002年第1期614卷 1110-1117页

作者： Y. Ueno E. S. Otabe T. Matsushita M. Kiuchi 1Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology 680-4 Kawazu Iizuka 820-8502 Japan 2Graduate School of Information Science and Electronic Engineering Kyushu University 6-10-1 Hakozaki Higashi-ku Fukuoka 812-8581 Japan

The current-voltage characteristics of superconducting Bi-2223 tapes are not as sharp as those of metallic superconductors. This feature, characterized by their low n values especially at high fields and at high temperatures, is partly influenced by the sausaging of the superconducting filaments. In order to improve the n values, therefore, the effect of filament sausaging on the transport property was investigated in this research. It was found that the distribution of the thickness of the filaments is of a Gaussian type. The real distribution of the critical current density (Jc) is obtained from the thickness distribution and the apparent distribution of pinning strength estimated using the flux creep-flow model. The estimated real distribution of Jc is slightly sharper than the apparent distribution of Jc. However, the improvement of the n-value is predicted not to be remarkable, even if the filament thickness can be made uniform.

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A high-throughput pipelined architecture for blind adaptive equalization with minimum latency

A high-throughput pipelined architecture for blind adaptive ...

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Asilomar Conference on Signals, systems & computers

作者： M. Mizuno K. Ueda J. Okello H. Ochi Department of Communication Electrical Engineering Nagano Japan Radio Co.Ltd. Faculty of Computer Science and System Engineering Kyushu Institute of Technology Japan

We propose a pipelined architecture for an equalizer based on the multilevel modified constant modulus algorithm (MMCMA). We also provide the correction factor that mathematically converts the adaptive equalizer having the proposed architecture into an equivalent non-pipelined conventional MMCMA based equalizer. The proposed architecture uses modules with 6 filter coefficients, resulting in an overall latency of a single sampling period, along the main transmission line. The basic concepts of the proposed architecture is to implement the finite impulse response (FIR) filter and the algorithm portion of the equalizer, such that the critical path of all circuits has three complex multipliers and three adders.

关键词： Blind equalizers Adaptive equalizers Delay Finite impulse response filter Throughput Pipeline processing computer architecture Sampling methods computer science systems engineering and theory

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Remote machinery maintenance system with the use of virtual reality

Remote machinery maintenance system with the use of virtual ...

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International Symposium on 3D Data Processing Visualization and Transmission

作者： M. Bellamine N. Abe K. Tanaka H. Taki Faculty of Computer Science and Engineering Kyushu Institute of Technology Fukuoka Japan Wakayama University Wakayama Wakayama Japan

The use of robots for fault diagnosis and maintenance operations is being more widely used. Robot control is generally done by teleoperation, which still has many weak points. To solve these problems, we use virtual reality techniques. We conceive a system for collecting vibration data using remote robot control by a virtual designed model. With our model we can manipulate both the machine to be checked, and the robot. In our 3D model the data collection points are very well known. This will assure precision in data collection. Our system assure good remote maintenance and fault diagnosis not only in dangerous places, but also in ordinary cases.

关键词： Machinery Virtual reality Fault diagnosis Robot sensing systems Robot control Inspection Orbital robotics Acoustic noise Force measurement Data visualization

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Dependence of irreversibility and vortex glass-liquid transition fields on electric field criterion in a superconducting Bi-2223 tape

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AIP Conference Proceedings 2002年第1期614卷 1193-1200页

作者： T. Matsushita M. Fukuda T. Kodama E. S. Otabe M. Kiuchi T. Kiss T. Akune N. Sakamoto K. Itoh 1Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology 680-4 Kawazu Iizuka 820-8502 2Graduate School of Information Science and Electronic Engineering Kyushu University 6-10-1 Hakozaki Higashi-ku Fukuoka 812-8501 Japan 3Faculty of Engineering Kyushu Sangyo University 3-1 Matsukadai 2 chome Higashi-ku Fukuoka 813-8503 Japan 4National Institute for Materials Science 1-2-1 Sengen Tsukuba-shi Ibaraki 305-0047 Japan

It is known that the irreversibility field depends largely on the electric field criterion, Ec, for the determination of the critical current density. In addition, it was recently found that the vortex glass-liquid transition field determined by the scaling of current-voltage curves also depended on the range of electric field in the measurement. In this paper the two characteristic fields are measured for a Bi-2223 silver-sheathed tape as a function of the electric field. The obtained result of the irreversibility field is compared with the theoretical result of the flux creep-flow model. Based on the agreement with the theoretical model a standard test method of the irreversibility field is proposed.

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