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Short Span Seeking control System of Hard Disk Drives Based on Pivot Friction Compensation

IFAC Proceedings Volumes 2010年第18期43卷 168-173页

作者： Motohiro Kawafuku Masaki Shibata Makoto Iwasaki Department of Electrical and Computer Engineering Nagoya Institute of Technology Gokiso Showa Nagoya 466-8555 Japan

In this paper, we propose a precise short-span seeking control system based on the pivot friction compensation. The proposed compensator consists of the feed forward compensation with perfect tracking control method and feedback compensation with optimum friction compensation. The effectiveness of the proposed compensator is verified by using numerical simulation.

关键词： control algorithms Disturbance rejection Friction Hysteresis loops Feedback control Feedforward compensation

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Research of Static Var Compensator control System Based on DSP Technology

Research of Static Var Compensator Control System Based on D...

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2010 The 2nd International Conference on Industrial Mechatronics and Automation (ICIMA 2010)

作者： Chang-yong Zheng School of Electronic & Information Engineering Anhui University of Architecture Hefei,China

We present the principle of the Static Var Compensator,and introduce the design of a static var compensator control *** design techniques of DSP CPU board and signal conditioning circuit is analyzed in this *** describe the fast algorithm solving reactive power and PID algorithm with variable parameter avoiding integral saturation in *** performance of static var compensator control system is also evaluated through wave measurement.

关键词： SVC DSP Reactive power Measurement control algorithms

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A Brief History of Modern Digital Shaker controllers

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SOUND AND VIBRATION 2010年第9期44卷 12-16页

作者： Zhuge, James Formenti, Dave Richardson, Mark Crystal Instruments Santa Clara CA USA Vibrant Technol Inc Scotts Valley CA USA Michigan Technol Univ Houghton MI 49931 USA Gen Motors Proving Grounds Milford MI USA

This article discusses four generations of digital vibration exciter control systems developed by U.S. companies over a period of 40 years. The controllers are categorized as standalone, PC-based, PC-tethered, and ful... 详细信息

关键词： Signal processing Studies control algorithms Fourier transforms Spectrum allocation Random vibration Personal computers controllers

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An Algorithm for Classification and Outlier Detection of Time-Series Data

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JOURNAL OF ATMOSPHERIC AND OCEANIC TECHNOLOGY 2010年第1期27卷 94-107页

作者： Weekley, R. Andrew Goodrich, Robert K. Cornman, Larry B. Natl Ctr Atmospher Res Boulder CO 80301 USA Univ Colorado Dept Math Boulder CO 80309 USA

An algorithm to perform outlier detection on time-series data is developed, the intelligent outlier detection algorithm (IODA). This algorithm treats a time series as an image and segments the image into clusters of interest, such as "nominal data'' and "failure mode'' clusters. The algorithm uses density clustering techniques to identify sequences of coincident clusters in both the time domain and delay space, where the delay-space representation of the time series consists of ordered pairs of consecutive data points taken from the time series. "Optimal'' clusters that contain either mostly nominal or mostly failure-mode data are identified in both the time domain and delay space. A best cluster is selected in delay space and used to construct a "feature'' in the time domain from a subset of the optimal time-domain clusters. Segments of the time series and each datum in the time series are classified using decision trees. Depending on the classification of the time series, a final quality score (or quality index) for each data point is calculated by combining a number of individual indicators. The performance of the algorithm is demonstrated via analyses of real and simulated time-series data.

关键词： Time series Studies control algorithms Data mining Cluster analysis

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Fundamentals in Selecting Input and Output Variables for Composting Process Automatic controllers

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COMPOST SCIENCE & UTILIZATION 2010年第1期18卷 6-21页

作者： Papadimitriou, Efstathios K. Bidlingmaier, Werner Gea, Teresa Reclay Holding GmbH Cologne Germany Bauhaus Univ Weimar Waste Management Chair D-99423 Weimar Germany Univ Autonoma Barcelona Dept Chem Engn ETSE E-08193 Barcelona Spain

This paper provides a critical analysis of the fundamental principles involved in the selection of input and output variables for automatic controllers of composting processes. Research results and technological advancements make available a number of parameters which may be used by a composting process controller. Parameters based on ventilation have been identified as the most appropriate controller output variables. On-line monitoring of odour generation potential and pathogen destruction has not become feasible, although recent advances indicate potential for electronic noses and biosensors. On-line measurement of reaction rate heavily depends on the suitability of microbial respirometric methods. Water content of the material being composted may be useful in on-line evaluation of reaction rate if relationships between water loss rate and respiration rate are adequately described. Developments in artificial intelligence offer, however, new avenues regarding real-time estimation of reaction rates. In general, the first experiences from application of artificial intelligence on composting process control indicate potential for substantial utility.

关键词： Composting Studies control algorithms Ventilation Variables controllers

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Tracking problem: higher order algorithms *

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IFAC Proceedings Volumes 2010年第14期43卷 1017-1022页

作者： M. Barbero–-Liñán M. Sigalotti Department of Mathematics & Statistics Queen's University Kingston (ON) K7L 3N6 Canada INRIA (Projet CORIDA) and Institut élie Cartan de Nancy Université Nancy 1 BP 239 Vandæuvre-lès-Nancy 54506 France

In this paper we propose new sufficient conditions ensuring that any curve on the configuration manifold of a mechanical control system can be tracked with arbitrary precision by an admissible trajectory of the system. We focus on forced affine connection control systems. These new sufficient conditions are stated in terms of convex cones constructed using particular brackets of the control vector fields of the system. They generalize those conditions known in the literature. The tracking control laws obtained depend on several parameters. By imposing suitable asymptotic conditions on such parameters, we construct algorithmically a one-parameter tracking control law. The theory is supported by numerical simulations for the system modeling the motion of an ellipsoidal submarine.

关键词： Tracking systems control algorithms differential geometry geometric approaches mechanical systems nonlinear control systems open-loop control systems

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Observed Characteristics of Hail Size in Four Regions in China during 1980-2005

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JOURNAL OF CLIMATE 2010年第18期23卷 4973-4982页

作者： Xie, Baoguo Zhang, Qinghong Wang, Yuqing Peking Univ Sch Phys Dept Atmospher Sci Beijing 100871 Peoples R China Univ Hawaii Manoa Dept Meteorol Honolulu HI 96822 USA Univ Hawaii Manoa Int Pacific Res Ctr Honolulu HI 96822 USA

The climatology and long-term trend of hail size in four regions of China are documented for the period of 1980-2005 using the maximum hail diameter (MHD) data obtained from the Meteorological Administrations of Xinjiang Uygur Autonomous Region (XUAR), the Inner Mongolia Autonomous Region (IMAR), Guizhou Province, and Hebei Province. The reported MHD is mainly around 10 mm in the four regions. Guizhou (in southwestern China) has the largest proportion of severe hail(MHD greater than 15 mm) among the four regions. Severe hail in southwestern China mainly occurs between February and June, while in northern China it occurs in summer (from May to August) with the peak in June. During the period studied, the size of severe hail shows a slight downtrend in Guizhou and IMAR, whereas it shows an uptrend and a flat trend in Hebei and XUAR, respectively. However, none of the trends is statistically significant. Results from sensitivity experiments using a one-dimensional numerical model show that hail size is sensitive to the freezing level height, the maximum updraft, and column cloud liquid water-all working together to determine the geographic distribution and long-term trend of the observed hail size in China.

关键词： Hail Studies control algorithms Experiments Trends Data collection Growth models Precipitation

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Online artifact subtraction for concurrent neural recording during ongoing electrical stimulation

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Journal of Medical Devices, Transactions of the ASME 2010年第2期4卷 1-1页

作者： Chernyy, Nick Gluckman, Bruce J. The Pennsylvania State University United States

Feedback-control has been proved to be advantageous in various technical fields and is likely to increase the performance of electrical neural interface devices. The control algorithms in such a device will rely on metrics of neural activity, thereby necessitating their differentiation from artifacts caused by electrical stimulation. We demonstrate an efficient algorithm for determining the relationship between the electrical stimulus current waveform and the recorded artifact potential, or transfer function. This facilitates online stimulus artifact subtraction and concurrent neural recordings during electrical stimulation. Furthermore, we demonstrate significant changes in this transfer function, in vivo, that occur on time scales of hours and are indicative of changes in the electrical properties of neural tissue. Tracking these variations is paramount for the successful implementation of a feedback-enabled neural control system.

关键词： bioelectric potentials feedback Electrical properties Medical signal processing Neurophysiology Biological tissues biocontrol control algorithms control systems Transfer functions neurophysiology medical signal processing Feedback algorithms

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A MUSIC-BASED MECHATRONIC SYSTEM FOR TEACHING MODELING AND control

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ASME International Mechanical Engineering Congress and Exposition

作者： Shilpiekandula, Vijay Song, Yun Seong MIT Dept Mech Engn Cambridge MA 02139 USA

ISBN: (纸本)9780791848708

Audio-based tools call enhance the learning experience in introductory modeling and control classes at the undergraduate (sophomore) level ill the mechanical engineering curriculum. An example audio-based learning tool that we propose is the "FlexSynth," servo-actuated flexural rocker arm that sways to an electronically generated music. We have built and tested the FlexSynth as part of a project under the MIT advanced graduate subject 2.737 Mechatronics class offered in Fall 2007. The angular range of the rocking motion of the flexural arm ill the FlexSynth is mapped to a set of musical notes. While the flexural rocker swayed to the generated 'command' music. its motion is also converted into all equivalent 'response' music. Two speakers are used, one to play the commanded music and the other to play the response music. The performance of control algorithms (such as proportional or proportional-integral control) call he discerned from the command and response music. and compared for better musical quality. The appeal of all electromechanical system, driven by music and controlled to see the 'dancing' flexural rocket: snakes the overalls system an interesting show-and-tell for young kids or the public at large, getting their excited about science and engineering automation. Advanced control issues,such as filtering of flexural damping modes of the rocker cart also he addressed with this system implementation. Advanced students ill the controls area can study the design tradeoffs between robustness and speed in following the command music. While the usual debugging tools such as multimeters, oscilloscopes, and dynamic signal analyzers allow for hands-on learning about the performance of a control system, all audio-based emit such as the FlexSynth cart he a valuable addition to the innovative teaching tool kit.

关键词： control algorithms Mechanical engineering Signals Servomechanisms control modeling Teaching control systems Design Filtration Robustness Tradeoffs Undergraduate students Mechatronics Oscilloscopes Damping Students

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DESIGN, DYNAMICS AND ACTIVE control OF MICRO INTERFEROMETERS FOR LOW NOISE PARALLEL OPERATION

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ASME International Mechanical Engineering Congress and Exposition

作者： Karhade, Omkar Degertekin, Levent Kurfess, Thomas Georgia Inst Technol Atlanta GA 30332 USA

ISBN: (纸本)9780791848746

Micromachined Scanning Grating Interferometer (mu SGI) array offers a viable solution to the high resolution, large bandwidth, non-contact and high throughput metrology. Parallel active control of mu SGIs is necessary to reduce the effect of positioning errors and ambient vibration noise. To achieve individual control of the mu SGIs, the gratings in the mu SGI are micromachined on Silicon membranes, which can be electrostatically actuated. These tunable gratings are designed to have sufficient range of motion (similar to 400nm) and sufficient bandwidth (similar to 50kHz) for effective noise reduction. The tunable gratings are fabricated successfully using Silicon on Insulator wafers with a two mask process.

关键词： Interferometers control algorithms Calibration algorithms Diffraction gratings Noise control Membranes Silicon Metrology Dynamics (Mechanics) Vibration Noise (Sound) Silicon-on-insulator Design Semiconductor wafers Errors Micromachining Resolution (Optics) Actuators

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