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Impact of surface roughness of diamond coatings on the cutting performance when dry machining of graphite

International Journal of Manufacturing Technology and Management 2008年第2期15卷 121-152页

作者： Cabral, Gil Reis, P. Titus, E. Madaleno, J.C. Davim, J.P. Grácio, J. Ahmed, Waqar Jackson, Mark J. Department of Mechanical Engineering Centre for Mechanical Technology and Automation University of Aveiro Aveiro Portugal School of Computing Technology and Physical Sciences University of Central Lancashire Preston PR1 4HE United Kingdom College of Technology Centre for Advanced Manufacturing Purdue University West Lafayette IN 47907-2021 United States Department of Nanotechnology University of Ulster Department of Mechanical Engineering College of Technology Purdue University Center for Advanced Manufacturing Birck Nanotechnology Center

Time Modulated Chemical Vapour Deposition. (TMCVD) process regime has been used to deposit diamond coatings onto commercially available tungsten carbide tool inserts. The TMCVD process was developed in our laboratories so that diamond films with fine grains could be deposited. It accomplishes this by promoting secondary nucleation during larger methane flow modulations. The average surface roughness of the diamond coatings were correlated with the cutting performance of the coatings when dry machining of graphite. Inserts coated were characterised by Scanning Electron Microscopy (SEM) and Raman spectroscopy and were tested for turning performance using graphite as the workpiece material. The cutting forces were measured by the DynoWare data acquisition system. Polycrystalline Diamond (PCD) inserts were also used for comparison. Repeated turning tests showed that the surface roughness of the coatings is a limiting factor when achieving better chip flow during machining. Copyright © 2008 Inderscience Enterprises Ltd.

关键词： Graphite

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Some problems of synchronous hydro-generator temperature measurement

Some problems of synchronous hydro-generator temperature mea...

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International Conference on Electrical Machines, ICEM

作者： Mario Vrazic Ivan Gasparac Milutin Pavlica Faculty of Electrical Engineering and Computing Department of Electrical Machines Drives and Automation University of Zagreb Zagreb Croatia

During complex measurements on synchronous hydro-generator 35MVA, among other measurements, temperature measurement of stator winding end was realized. The real aim of this temperature measurement was to determine influence of excitation winding on armature windings during different operation points. This paper describes the measurement procedure, measurement system and some problems that occurred during this measurement.

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Ensuring synchronous generator special standstill tests

Ensuring synchronous generator special standstill tests

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International Conference on Electrical Machines, ICEM

作者： Mario Vrazic Ivan Gasparac Milutin Pavlica Faculty of Electrical Engineering and Computing Department of Electrical Machines Drives and Automation University of Zagreb Zagreb Croatia

During extensive testing of 35 MVA synchronous generator, some tests in standstill were conducted. For those tests rotor was blocked and different DC currents were driven through excitation and armature winding. In order to ensure all necessary conditions for such tests lots of preparations were made. This paper will thoroughly explain all problems that come out of such request and solutions for them.

关键词： Synchronous generators Turbines Torque Blades Rail transportation Steel Automatic testing Synchronous machines Stators Armature

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Dynamic Modelling of a Quadrotor Aerial Vehicle with Nonlinear Inputs

Dynamic Modelling of a Quadrotor Aerial Vehicle with Nonline...

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IEEE Latin American Robotics Symposium, LARS

作者： Armando S. Sanca Pablo J. Alsina Jés de Jesus F. Cerqueira Computing Engineering and Automation Department Federal University of Rio Grande do Norte Brazil Electrical Engineering Department Federal University of Bahia Salvador BA Brazil

In this paper the quadrotor dynamic model with nonlinear inputs is presented. Deadzone and saturation nonlinear inputs are considered for the quadrotor reflected to the actuators. The goal is to obtain a faithful mathematical representation of the mechanical system for system analysis and control design, not only in hover as presented in many works, but also in motion when take-off, land and flight for aerial navigation task. The model was implemented in Matlab/Simulink simulation model to optimize the design and to project control. Simulations of the model show that the nonlinear inputs must be considered in the control project.

关键词： Vehicle dynamics Vehicles Mathematical model Nonlinear dynamical systems Actuators Mechanical systems Control system analysis Control design Motion analysis Navigation

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Multiobjective fixed-order controllers for MIMO systems

Multiobjective fixed-order controllers for MIMO systems

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International Conference on Control, automation, Robotics and Vision (ICARCV)

作者： Qiongbin Lin Fuwen Yang Department of Electrical Engineering and Automation Fuzhou university Fuzhou Fujian China Department of Information Systems and Computing Brunei University Middlesex UK

This paper studies the fixed-order controllers design problem for multi-input-multi-output (MIMO) systems. Polynomial methods are employed to design a controller that guarantees all the closed-loop poles reside within given D-stability regions. An H infin optimization approach is proposed to minimize the interaction between different channels of the MIMO system. Sufficient conditions for the existence of such a fixed-controller is established by using the linear matrix inequalities (LMIs) approach.

关键词： Control systems MIMO Automatic control Polynomials Linear matrix inequalities Robotics and automation Control theory Control system synthesis Industrial control Design automation

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Walking aids for elderly people： a systematic overview

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仪器仪表学报 2008年第1期29卷 216-224页

作者： Zhou Huiyu Hu Huosheng Fei Minrui School of Engineering and Design Brunel University Uxbridge UB8 3 PH U. K. Department of Computing and Electronic Systems University of Essex Colchester CO4 3SQ U.K. School of Mechatronics Engineering and Automation Shanghai University Shanghai 20072 China

Reduction of falls of elderly people has been an active research area for many *** of older people can be signicantly reduced through the smart use of *** technologies can help older people to regain mobility and reduce their reliance on community care ***,mobility aids,as one of the main components of these assistive technologies,are mainly discussed in this *** obstacle detection systems and mobility aids will be reviewed in this paper,where different features are explicitly addressed.

关键词：障碍绕射中老年人传感器行走辅助工具跌倒伤

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IEEE Transactions on Haptics: Editorial

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IEEE Transactions on Haptics 2008年第1期1卷 2-8页

作者： Edward Colgate, J. Lederman, Susan Prattichizzo, Domenico Barbagli, Federico Basdogan, Cagatay Buss, Martin Ernst, Marc Frisoli, Antonio Gillespie, Brent Grant, Danny Harders, Matthias Hayward, Vincent Jones, Lynette Kajimoto, Hiroyuki Kappers, Astrid Kheddar, Abderrahmane Lin, Ming C. MacLean, Karon Miller, Brian Noma, Haruo Okamura, Allison M. O'Malley, Mareia Ryu, Jeha Tan, Hong Z. Yokokohji, Yasuyoshi Department of Psychology School of Computing Queen's University Canada IEEE Robotics and Automation Society Tübingen Germany Stanford University's Computer Science Department Tübingen Germany Institute of Automatic Control Engineering Technische Universität München Germany Independent Research Group Multisensory Perception and Action Max Planck Institute for Biological Cybernetics Tübingen Germany Department of Applied Mechanics SSSA Japan Research Division Virtual Reality and Telerobotic Systems PERCRO Laboratory Japan Department of Mechanical Engineering Japan Department of Robotics McGill University Canada Computer Vision Lab ETH Zurich Japan Virtual Reality in Medicine Group Japan IEEE CS/RAS Technical Committee on Haptics Japan Department of Electrical and Computer Engineering McGill University Canada Department of Mechanical Engineering MIT Japan University of Electro-Communications Japan Department of Physics and Astronomy Utrecht University Netherlands University of Evry France Chapel Hill United States Department of Computer Science University of British Columbia Canada ATR Knowledge Science Lab United Kingdom Department of Mechanical Engineering Denmark Johns Hopkins University United States Laboratory for Computational Sensing and Robotics United Kingdom Engineering Research Center for Computer-Integrated Surgical Systems and Technology United States Mechanical Engineering and Materials Science Department Rice University United States Korea Republic of Department of Electrical and Computer Engineering Mechanical Engineering and Psychological Sciences Purdue University United States Department of Mechanical Engineering and Science Graduate School of Engineering Kyoto University Japan

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Analysis of short-circuit forces at the top of the low voltage U-type and I-type winding in a power transformer

Analysis of short-circuit forces at the top of the low volta...

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International (EPE-PEMC) Power Electronics and Motion Control Conference

作者： Leonardo Strac Franjo Kelemen Damir Zarko Research and Development Department Končar Power Transformers Limited Zagreb Croatia Faculty of Electrical Engineering and Computing Department of Electrical Machines Drives and Automation University of Zagreb Zagreb Croatia

The aim of this study was to compare the short-circuit forces in the U-type and I-type low voltage winding of a large power transformer. The comparison of forces calculated using 2D Rabinpsilas method and 3D finite element method is conducted. The influence of the winding helix pitch on the winding forces calculated using 3D finite element method is also investigated.

关键词： Windings Power transformers Force Finite element methods Three dimensional displays Mathematical model Equations

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Indices for Harmonic Distortion Monitoring of Power Distribution Systems

Indices for Harmonic Distortion Monitoring of Power Distribu...

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2008 IEEE Instrumentation and Measurement Technology Conference (I2MTC 2008), vol.1

作者： Sasa Vlahinic Dalibor Brnobic Nino Stojkovic Faculty of Engineering Department of Automation Electronics and Computing Rijeka Croatia

Among different power quality parameters, the voltage total harmonic distortion is important and often-analyzed category. Different indices have already been suggested to measure and to monitor both the current and the voltage distortion in power systems, but harmonic site characterization still cannot be performed in satisfactory way. The state of the harmonic distortion is difficult to predict due to variability and a large number of unknown, such as detailed consumer and system characteristics. In this paper a new index describing the total harmonic distortion in current measurements, total rated distortion (TRD), is suggested in order to simplify and standardize harmonic current measurements. Another index representing the increase of harmonic voltage distortion with TRD, equivalent harmonic impedance z_(eq), is proposed as an efficient way of characterizing a particular site. Finally, extensive harmonic measurements of a real distribution system were performed to prove the usefulness of the proposed indices.

关键词： Harmonic distortion measurement harmonic distortion monitoring harmonic indices

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Global robust synchronization of the Duffing system and Van der Pol oscillator

Global robust synchronization of the Duffing system and Van ...

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IEEE Conference on Decision and Control

作者： Weijie Sun Daizhan Cheng Jie Huang College of Automation Science and Engineering South China University of Technology Guangzhou China Institute of Mathematics and System Science Chinese Academy and Sciences Beijing China Laboratory of Applied Control and Computing Department of Mechanical and Automation Engineering Chinese University of Hong Kong New Territories Hong Kong China

In this paper, we study the global robust synchronization problem of the controlled Duffing system and the Van der Pol oscillator. By employing the internal model approach, we first show that the problem can be converted into a global robust stabilization problem of a time-varying nonlinear system in lower triangular form. Then we show that the global stabilization problem of the lower triangular system is solvable, thus leading to the solution of the global robust synchronization problem.

关键词： Robustness Oscillators Control systems Robust control Time varying systems Nonlinear systems Partial differential equations Automatic control Sun Output feedback

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