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Aeromems Wall Hot-Wire Sensor Arrays on Polyimide with Through Foil Vias and Bottom Side Electrical Contacts

Aeromems Wall Hot-Wire Sensor Arrays on Polyimide with Throu...

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International Conference on Solid State Sensors and Actuators (TRANSDUCERS)

作者： U. Buder L. Henning A. Neumann E. Obermeier Microsensor & Actuator Technology Center Faculty of Electrical Engineering and Computer Science Technical University Berlin Berlin Germany Measurement and Control Group Faculty of Process Sciences and Engineering Technical University Berlin Berlin Germany Center of Advanced Packaging Faculty of Electrical Engineering and Computer Science Technical University Berlin Berlin Germany

Design and manufacturing of linear arrays consisting of forty MEMS wall-hot wires on a flexible substrate featuring through foil vias and bottom side electrical contacts are presented. Realization of through foil contacts featuring a resistance of less than 0.1 Ω is based on a specifically developed process consisting of laser-"drilling" and sputtering, which is presented in detail. Measurements conducted on a flat plate in a wind tunnel demonstrate the sophistication of the system as sensor induced flow disturbances can not be detected. The sensor system presented therefore is an ideal tool to investigate sensitive flow phenomena like transition and separation.

关键词： Sensor arrays Polyimides Sensor systems Flexible manufacturing systems Micromechanical devices Wires Electric resistance Contact resistance Laser transitions Drilling

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Robust design for bilateral teleoperation system with Markov jumping parameters

Robust design for bilateral teleoperation system with Markov...

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2007 IEEE/RSJ International Conference on Intelligent Robots and Systems

作者： Weimin Shen Jason Gu Evangelos Milos Department of Electrical and Computer Engineering Dalhousie University Halifax NS Canada Shenzhen Institute of Advanced Technology China Computer Science Dalhousie University Halifax NS Canada

This paper presents a robust design for the general bilateral teleoperation system with Markov jumping parameters. Although passivity-based approach and robust design-based approach can stabilize the bilateral teleoperation system, sufficient conditions are too conservative. In this paper, requirements for a general bilateral teleoperation system are given first. Next, time delays on the Internet are modeled by a Markov process with nine states, three for the forward communication branch and three for the backward communication branch. Based on the requirements of the master and the slave controllers, the standard robust design are carried out. Then, with the model of Internet time delays, the bilateral teleoperation system is reconstructed by a Markov jumping system. Based on the mode-dependent stability conditions for the stochastic time delay system, the closed-loop controller is designed to obtain the less conservative stable system and to therefore improve the performance of tracking and transparency. Simulation has been carried out and the results verify the feasibility and efficiency of the proposed approach.

关键词： Robustness Delay effects Internet Sufficient conditions Markov processes Master-slave Communication system control Robust control Stability Stochastic systems

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An Initial Rotor Position Estimation Method for Switched Reluctance Motor without Using Machine Parameter

An Initial Rotor Position Estimation Method for Switched Rel...

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International Conference on Electrical Machines and Systems 2007(ICEMS2007)(第十届国际电机与系统会议)

作者： K. Tungpimolrut S. Kachapornkul P.Somsiri P. Jitkreeyarn Tadashi Fukao Akira Chiba Industrial Control and Automation Laboratory Section National Electronics and Computer Technology C Department of Electrical Engineering Faculty of Science and Technology Tokyo University of Science

In this paper a method to estimate the initial rotor position of the switched reluctance motor (SRM) at the stand still condition is proposed. The proposed method can be implemented by the simple microcontroller based system, and it is not necessary to know the magnetization curves. The impulse gate drive signal is applied and the winding current is detected and its approximate value is used for calculating the rotor position. The compensation method to reduce the estimation error thorough one cycle is also mentioned. The proposed method is implemented with the 6-stator-pole and 4- rotor-pole, 1.5 kW 3-phase switched reluctance motor.

关键词： Switched reluctance motor initial rotor position estimation

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Kernelized Fuzzy c-means Method in Fast Segmentation of Demyelination Plaques in Multiple Sclerosis

Kernelized Fuzzy c-means Method in Fast Segmentation of Demy...

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29th Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBS 2007), vol.14

作者： Jacek Kawa Ewa Pietka Faculty of Automatic Control Electronics and Computer Science Department of Biomedical Engineering Gliwic Silesian University of Technology Gliwice Poland

Fuzzy c-means method (FCM) is a popular tool for a fuzzy data processing. In the current study, a FCM-based method of fuzzy clustering in a kernel space has been implemented. First, a "kernel trick" is applied to the fuzzy c-means algorithm. Then, the new method is employed for a fast automated segmentation of demyelination plaques in Multiple Sclerosis (MS). The clusters in a Gaussian kernel space are analysed in the histogram context and used during the initial classification of the brain tissue. Received classification masks are then used to detect the region of interest, eliminate false positives and label MS lesions.

关键词： Multiple sclerosis Kernel Clustering algorithms Image segmentation Prototypes Partitioning algorithms Lesions Magnetic resonance imaging Fuzzy sets Data processing

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Modeling and Identification for High-Speed Milling Machines

Modeling and Identification for High-Speed Milling Machines

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IEEE International Conference on Automation science and engineering (CASE)

作者： Jiangzhao Yang Dongjun Zhang Zexiang Li Division of Control and Mechatronics Harbin Institute of Technology Shenzhen Graduate School Shenzhen China Department of Electronic and Computer Engineering Hong Kong University of Science and Technology Kowloon Hong Kong China

Accurate modeling and identification to the dynamics of the feed drive system is significant in designing a high performance milling machine. In this paper, mathematical model of the feed drive system, including electromagnetic and mechanical aspects, is concluded. To be consistent with the controller design techniques, two different grey-box identification methods are discussed to estimate the model of a practical milling machine. It turns out that the sampled-data control system with a slower sample rate fits the system better than the faster one. Moreover, compared with the model estimated by partial continuous approach, the total discrete-time model achieves better results in the model validation.

关键词： Metalworking machines Feeds Servomechanisms Mathematical model control systems Machining Servomotors Robust control Friction Power system modeling

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H∞ filtering for a class of 2D systems

H∞ filtering for a class of 2D systems

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15th European Signal Processing Conference, EUSIPCO 2007

作者： Wu, Ligang Lam, James Paszke, Wojciech Galkowski, Krzysztof Rogers, Eric Kummert, Anton Space Control and Inertial Technology Research Center Harbin Institute of Technology Harbin 150001 China Department of Mechanical Engineering University of Hong Kong Pokfulam Road Hong Kong Hong Kong Institute of Control and Computation Engineering University of Zielona Góra 65-246 Zielona Góra Poland Department of Electronics and Computer Science University of Southampton Southampton SO17 1BJ United Kingdom University of Wuppertal Faculty of Electrical Information and Media Engineering Communication Theory Germany

ISBN: (纸本)9788392134022

The unique characteristic of a repetitive process is a series of sweeps or passes through a set of dynamics defined over a finite duration known as the pass length. At the end of each pass, the process is reset and the next time through the output, or pass profile, produced on the previous pass acts as a forcing function on, an hence contributes to, the dynamics of the new pass profile. They are hence a class of systems with information propagation in two independent directions where here the dynamics over the finite pass length are described by a matrix linear differential equation and that from pass to pass has a discrete updating structure. This means that filtering/estimation theory/algorithms for, in particular, 2D discrete linear systems is not applicable. In this paper we solve a general filtering problem with a view toward use in the many applications where such action will be required. © 2007 EURASIP.

关键词： Dynamics

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Filtering of discrete linear repetitive processes with ∞ and 2-∞ performance

Filtering of discrete linear repetitive processes with ∞ an...

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2007 IEEE International Symposium on Circuits and Systems, ISCAS 2007

作者： Ligang, Wu Lam, James Paszke, Wojciech Galkowski, Krzysztof Rogers, Eric Kummert, Anton Space Control and Inertial Technology Research Center Harbin Institute of Technology Harbin 150001 China Department of Mechanical Engineering University of Hong Kong Pokfulam Road Hong Kong Hong Kong Institute of Control and Computation Engineering University of Zielona Góra 65-246 Zielona Góra Poland School of Electronics and Computer Science University of Southampton Southampton SO17 IBJ United Kingdom University of Wuppertal Faculty of Electrical Information and Media Engineering Communication Theory

This paper considers the general filtering problem for a distinct class of two-dimensional (2-D) discrete linear systems, i.e. information propagation in two independent directions, known as discrete linear repetitive processes which are of both system-theoretic and applications interest. In particular, new results on the design of filters with guaranteed levels of performance are developed. These take the form of algorithms for the design of an ∞ and 2-∞ dynamic output feedback filter which guarantees that the resulting filtering error process is stable and has prescribed disturbance attenuation performance as measured by ∞ and 2- ∞ norms. © 2007 IEEE.

关键词： Signal filtering and prediction

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Singular Time Delayed System Stability Theory in the sense of Lyapunov: A Quite New Approach

Singular Time Delayed System Stability Theory in the sense o...

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American control Conference (ACC)

作者： D. LJ. Debeljkovic S. B. Stojanovic N. S. Visnjic S. A. Milinkovic Faculty of Mechanical Eng Department of Control Engineering University of Belgrade Belgrade Serbia Faculty of Technology University of Nis Leskovac Serbia Faculty of Computer Science Knez Mihailova 6/VI Belgrade Serbia and Montenegro

This paper gives sufficient conditions for the stability of linear singular continuous delay systems of the form E ⨰ (t)= A o x (t) A 1 x ( t-τ ). These new, delay–independent conditions are derived using approach based on Lyapunov's direct method. A numerical example has been working out to show the applicability of results derived.

关键词： Delay systems Delay effects control systems Robust stability Lyapunov method Sufficient conditions Cities and towns Paper technology computer science Stability criteria

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DFT algorithm analysis in low-cost power quality measurement systems based on a DSP processor

DFT algorithm analysis in low-cost power quality measurement...

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International Conference on Electrical Power Quality and Utilisation (EPQU)

作者： Miroslaw Szmajda Krzysztof Gorecki Janusz Mroczka Faculty of Electrical Engineering Automatic Control and Computer Science Opole University of Technology Opole Poland Faculty of Electronics Chair of Electronics and Photonics Metrology Technical University of Wrocław Wroclaw Poland

The application of power quality parameters measurement algorithms requires utilization of computational methods which transform the signal from the time- to the frequency-domain. Currently, the most frequently applied method is the fast Fourier transformation (FFT). Because of the amendment of the proper power quality standards, it is also necessary to consider of implementation discrete Fourier transformation (DFT) algorithms. Considering the number of computations, DFT is more complicated than FFT. This paper presents basic analog-to-digital conversion parameters, which are defined in the norms, the time duration analysis of DFT algorithms, considering described assumptions and comparing them to FFT. Codes created in C and assembler languages, as well as the Matlab/Simulink environment, were taken into account. The software including the aforementioned codes was implemented in a low-cost power quality measurement system based on the TMS320c6713 floating point DSP processor from Texas Instruments. In the software, a real time DSP/BIOS operation system was used. Multi thread programming in power quality measurement systems was presented, and an analysis of computational efficiencies of the systems based on the TMS320c6 713 DSP processors was performed.

关键词： Algorithm design and analysis Power quality Power measurement Digital signal processing Discrete Fourier transforms Frequency measurement Discrete transforms Frequency domain analysis Analog-digital conversion Assembly

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F&A compensating variable bang-bang control algorithm for pneumatic driving glass-wall cleaning robot

F&A compensating variable bang-bang control algorithm for pn...

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2007 IEEE/RSJ International Conference on Intelligent Robots and Systems

作者： W. Wang H. X. Zhang W. P. Yu G. H. Zong J. W. Zhang Robotics Institute School of Mechanical Engineering and Automation Beijing Aeronautics and Astronautics University Beijing China Institute of Technical Aspects of Multimodal Systems Department of Computer Science University of Hamburg Hamburg Germany Cognitive Technology Laboratory Shenzhen Institute of Advanced Technology Shenzhen China

To overcome the overshoot and oscillation in the normal Bang-Bang controller applied in the pneumatic driving glass-wall cleaning robot, this paper presents a F&A compensating variable Bang-Bang control algorithm for the pneumatic position servo. Besides a new cylinder driving plan is designed, the control algorithm is also improved by adding a fiction force compensating item in the chamber force evaluation equation. To adjust the controlling parameters dynamically, certain increasing functions, such as step function, linear function and arc-tangent function, are used to define the piston's expectative acceleration along with the reduction of the piston's position error. To testify the feasibility of the control algorithms with the above three expectative acceleration setting functions respectively, a pneumatic glass-wall cleaning robot "Sky Cleaner 4" is used as a testing platform to implement a series of on-load position servo experiments. And the different results of them are compared.

关键词： Bang-bang control Cleaning Robots Servomechanisms Testing Algorithm design and analysis Force control Equations Acceleration Error correction

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