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A novel design of wave energy harvest device with flywheel energy storage system

A novel design of wave energy harvest device with flywheel e...

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15th World Multi-Conference on Systemics, Cybernetics and Informatics, WMSCI 2011

作者： Lin, Kuo-Chi Joo, Young Hoon Helkin, Steven Chan, Ham Dept. of Mechanical Materials and Aerospace Engineering University of Central Florida Orlando FL 32816 United States Dept. of Control Robot and Systems Engineering Kunsan National University Kunsan 573-701 Korea Republic of Dept. of Mechatronics Engineering Southern Polytechnic State University Marietta GA 30060 United States

ISBN: (纸本)9781936338290

This paper describes a novel design of a wave energy harvest device that utilizes a flywheel energy storage (FES) system to yield increased power generation. The buoy design is moored to the ocean floor via a cable;as the buoy is heaved vertically by ocean waves, the cable rotates a pulley which in turn drives the rotor of an onboard generator. A ratchet within the pulley allows the rotor to only be turned in one direction. To prevent large tensions from begin imposed on the cable by the back torque from the generator, a flywheel energy storage system is used. As the buoy is heaved vertically by incident waves, the electric load on the generator is removed, resulting in all of the energy extracted by the buoy to be stored in the flywheel system. Consequently the buoy is less restricted by high tensions and able to closely follow the motion of the waves, even while using a large generator with a high back torque coefficient. As the buoy moves downward after being heaved, the load is re-coupled to the generator, transferring the energy stored by the flywheel to the generator. Essentially the FES system trades power generation time for improved buoy motion. The focus of the paper is not to optimize the design of the buoy, but rather demonstrate the effectiveness of the FES system for the buoy design with arbitrary parameters. Simple simulations for a small buoy confirm the effectiveness of the proposed flywheel energy storage system - without it the wave energy harvest device produced only 90.0 watts of power, but with it the device produced 180.3 watts - an improvement of 100%. This improvement is based on a small generator with low back torque coefficient;for a large-scale design and stronger generator, the benefits are expected to be even greater.

关键词： Buoys

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Investigation in control of small-scale biomass boilers

Investigation in control of small-scale biomass boilers

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2011 12th International Carpathian control Conference, ICCC'2011

作者： Plaček, Viktor Šulc, Bohumil Vrána, Stanislav Hrdlička, Jan Pitel', Ján Dept. of Instrumentation and Control Engineering CTU in Prague Prague Czech Republic Dept. of Fluid Dynamics and Power Engineering CTU in Prague Prague Czech Republic Deprt. of Informatics Mathematics and Cybernetics Technical University of Košice Prešov Slovakia

ISBN: (纸本)9781612843599

This paper discusses certain specific problems of small-scale biomass combustion control and their investigation. It describes development of an experimental stand based on market available boiler for wooden pellets that has been equipped with special control unit based on a PAC. In the paper is shown elimination of CO peaks appearing after periodical grate sweeping and main effort is focused on replacement of mostly used on/off heat output control by a PI controller. Application of the PI controller has lowered CO emissions during transition states and improved stability of the combustion process. © 2011 IEEE.

关键词： Biomass

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Role of O2/Ar mixing ratio on the performances of IZO thin film transistors fabricated using a two-step deposition process

Role of O2/Ar mixing ratio on the performances of IZO thin f...

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作者： Kim, Won Lee, Sang-Hyuk Bang, Jung-Hwan Uhm, Hyun-Seok Park, Jin-Seok Dept. of Electronic Electrical Control and Instrumentation Engineering Hanyang University 1271 Sa-3dong Sangnok-gu Ansan Gyeonggi-do 426-791 Korea Republic of

Abstract In this study, a simple method of fabricating a thin-film transistor (TFT) with a double-layered channel using indium-zinc-oxide (IZO) films was proposed. Two IZO films used as channel layers were consecutively deposited via sputtering without stopping the vacuum and only by changing the volumetric fraction of the additive O2 gas during the deposition. Time-of-flight secondary ion mass spectrometry (ToF-SIMS) analysis showed a large difference in the dept. profiles of the InO- and InO 2- ions between the two IZO layers. Compared to the conventional single-IZO-channel TFT, the double-IZO-channel TFT that was fabricated using the proposed two-step deposition method showed greatly improved electrical characteristics: the on/off-state current ratio was increased from 1.30 × 105 to 1.03 × 106, and the field effect mobility was enhanced from 1.2 to 9.3 cm2/Vs.

关键词： Thin film transistors

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Online intelligent analyzer for blood pressure measurement

Online intelligent analyzer for blood pressure measurement

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2011 3rd International Conference on Trendz in Information Sciences and Computing, TISC 2011

作者： Sunitha, K.A. Dash, S.S. Krishnakumari, S. Senthil Kumar, N. Dept. Instrumentation and Control Engineering SRM University Kattankulathur - 603 203 India 626 005 Sivakasi India EEE Department SRM University Kattankulathur - 603 203 India

ISBN: (纸本)9781467301329

At present scenario BP is the emerging factor of mortality. This is the impetus behind the work that had been developed for an intelligent, accurate, continuous diagnosis of hyper blood pressure and hypo blood pressure. Here fuzzy system plays a role of intelligent system which takes age, gender, body mass index, smoking habit, alcohol intake, pregnancy condition, family history as linguistic variables and diagnoses whether the person is having hypotension or hypertension. Apart from diagnosing, the developed system also gives the risk level of getting hypotension or hypertension in future by taking the above linguistic variables. So by improving his/her's life style he/she can have a better control on blood pressure which can extend his or her lifespan. After diagnosing the system is programmed in such a way that it alarms immediately if there is an abnormability in the BP measurement so this helps in self assessment of blood pressure for the individual itself. This system also has an inbuilt provision of sending the analyzed data to the doctor, so that the person can get an online medication which saves the time, cost of travelling, so that the instant medication can be given to prevent the forthcoming adverse damage as early as possible. This system has been developed by using LabVIEW. The BP value is fed into the pc where the analysis of blood pressure value is done by fuzzy system designer available in LabVIEW. The fuzzy system analyzes the current status of the person by taking all the dependent linguistic variables and intelligently diagnose the BP status of the patient by itself. It also responds to the fluctuations in BP. This diagnosed data is send to the physician using web publishing tool in lab view. © 2011 IEEE.

关键词： Fuzzy systems

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Continuous control issues concerning operation improvement of small-scale biomass boilers

Continuous control issues concerning operation improvement o...

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作者： Haapa-Aho, Jonne Korpela, Timo Björkqvist, Tomas Hrdlička, Jan Plaček, Viktor Vrána, Stanislav Šulc, Bohumil Tampere University of Technology Dept. Automation Science and Engineering P.O. BOX 692 33101 Tampere Finland Czech Technical University in Prague Dept. Fluid Dynamics and Power Engineering Technická 4 16607 Prague Czech Republic Czech Technical University in Prague Dept. Instrumentation and Control Engineering Technická 4 16607 Prague Czech Republic

ISBN: (纸本)9783902661937

To meet the increasing environmental and efficiency requirements, the possibilities to improve the performance of a 25 kWth wood pellet boiler by utilizing PLC and feedback control are investigated. The process is first stabilized by improving the grate sweeping sequence, which originally disturbs the process. Prior to continuous combustion control development, the process is analyzed and identified. After sequential control improvements the combustion behaves well but tends to drift. A PID controller was designed to enable drifting compensation. It is shown that improved grate sweeping sequence and continuous feedback control provide a major improvement for system performance cost effectively. © 2011 IFAC.

关键词： Three term control systems

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Modeling of an Inductively Coupled Cl2/Ar Plasma Using Neural Network

Modeling of an Inductively Coupled Cl2/Ar Plasma Using Neura...

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2011年第三届微电子及等离子体技术国际会议

作者： Moonkeun Kim Hanbyeol Jang Yong-Hwa Lee Kwang-Ho Kwon Dept. of Control and Instrumentation Engineering Korea University Jochiwon Chungnam 339-700Republic of Korea Dept. of Control and Instrumentation Engineering Korea University Jochiwon Chungnam 339-700Repub

asma process has gained widespread use in the manufacture of micro- and nano- electronics technology since it can increase the integrated density of devices.

关键词： Neural Network Cl2/Ar Inductively Coupled Plasma Double Langmuir Probe

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Development of an omnidirectional walking engine for full-sized lightweight humanoid robots

Development of an omnidirectional walking engine for full-si...

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ASME 2011 International Design engineering Technical Conferences and Computers and Information in engineering Conference, IDETC/CIE 2011

作者： Song, Seungmoon Ryoo, Young-Jae Hong, Dennis W. Robotics Institute Carnegie Mellon University Pittsburgh PA 15213 United States Dept. of Control and Robot Engineering Mokpo National University Muan-goon Korea Republic of Robotics and Mechanisms Laboratory Dept. of Mechanical Engineering Virginia Tech. Blacksburg VA 24061 United States

ISBN: (纸本)9780791854839

In this paper, we propose and demonstrate an omnidirectional walking engine that achieves stable walking using feedback from an inertial measurement unit (IMU). The 3D linear inverted pendulum model (3D-LIPM) is used as a simplified model of the robot, the zero moment point (ZMP) criterion is used as the stability criterion, and only the feedback from the IMU is utilized for stabilization. The proposed walking engine consists of two parts;the omnidirectional gait generator, and the stability controller. ZMP equations, derived based on the 3D-LIPM, are used in the omnidirectional gait generator. The solutions of the differential equations are directly used which reduces the computation cost compare to other existing methods. Two kinds of feedback controllers are implemented for the stability controller;one is the indirect reference ZMP controller, and the other is the indirect joint controller. The walking engine is tested on a lightweight, full-sized, 21-degree-of-freedom (DOF) humanoid robot CHARLI-L (Cognitive Humanoid Autonomous robot with Learning Intelligence, version Lightweight) which stands 141 cm tall and weighs only 12.7 kg. The design goals of CHARLI-L are low development cost, lightweight, and simple design, which all match well with the proposed walking engine. The results of the experiments present the efficacy of our approach. Copyright © 2011 by ASME.

关键词： Anthropomorphic robots

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Estimation, analysis and smoothing of self-similar network induced delays in feedback control of nuclear reactors

Estimation, analysis and smoothing of self-similar network i...

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International Conference on Process Automation, control and Computing

作者： Majumder, Basudev Das, Saptarshi Pan, Indranil Saha, Sayan Das, Shantanu Gupta, Amitava Salt-Lake Campus Jadavpur University Kolkata-700098 India Dept. of Power Engineering Salt-Lake Campus Jadavpur University Kolkata-700098 India Dept. of Instrumentation and Electronics Engineering Kolkata-700098 India Bhabha Atomic Research Centre Reactor Control Division Mumbai-400085 India

ISBN: (纸本)9781612847641

This paper analyzes a nuclear reactor power signal that suffers from network induced random delays in the shared data network while being fed-back to the Reactor Regulating System (RRS). A detailed study is carried out to investigate the self similarity of random delay dynamics due to the network traffic in shared medium. The fractionality or self-similarity in the network induced delay that corrupts the measured power signal coming from Self Powered Neutron Detectors (SPND) is estimated and analyzed. As any fractional order randomness is intrinsically different from conventional Gaussian kind of randomness, these delay dynamics need to be handled efficiently, before reaching the controller within the RRS. An attempt has been made to minimize the effect of the randomness in the reactor power transient data with few classes of smoothing filters. The performance measure of the smoothers with fractional order noise consideration is also investigated into. © 2011 IEEE.

关键词： Feedback

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Another closed-form expression of average error rate for the Nth best relay selection AF relaying over Rayleigh fading channels

Another closed-form expression of average error rate for the...

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2011 International Conference on ICT Convergence, ICTC 2011

作者： Ko, Kyunbyoung Seo, Jeongtae Woo, Choongchae Dept. of Control and Instrumentation Engineering Chungju National Univ. 72 Daehangno Chungju-si Chungbuk 380-702 Korea Republic of Dept. of Electronics and Computer Engineering Hanseo Univ. 360 Daegok-ri Haemi-myun Seosan-si Chungnam 356-706 Korea Republic of

ISBN: (纸本)9781457712678

In this paper, we derive another approximated closed-form average error rate as a more tractable form for the Nth best opportunistic amplify-and-forward (OAF) relay systems over Rayleigh fading channels. At first, we derive the Nth best relay's selection probability. Based on this, the average symbol error rate (ASER) using the moment generating function (MGF) is derived as the approximated form. In particular, the closed-form expression for error probability is derived using the probability density function (PDF)-approach. In addition, it is verified that the derived analytical one can be a more tractable form having the specified the number of multiple summations and the specified length of each summation. Simulation results are finally presented to validate derived numerical ones. © 2011 IEEE.

关键词： Probability density function

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Robust Feedback Linearization using Higher Order Sliding Mode Observer

Robust Feedback Linearization using Higher Order Sliding Mod...

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IEEE Conference on Decision and control

作者： S. Iqbal C. Edwards A. I. Bhatti Dept. of Electronic Engineering Mohammad Ali Jinnah University Islamabad Control & Instrumentation Group Engineering Dept. University of Leicester UK

ISBN: (纸本)9781612848006

A novel robust feedback linearization scheme is proposed in this paper based on a modified robust exact differentiator. The states and drift terms in the system are estimated simultaneously by the observer using back injection of the control effort. The estimated drift term is used in the feedback loop to compensate the disturbances and observed states are used for feedback linearization. Finite time convergence of the complete closed-loop system is proved and thus a form of separation principle is satisfied, i.e., the controller and observer can be separately designed. The design is verified through simulations and by experiments on a DC motor rig.

关键词： Linearization Feedback sliding mode observer Observers controllers

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