Dissertations / Theses: 'Flywheel speed'

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Forslid, Erik, and Jacob Mattsson. "Measurement technique for high speed flywheel." Thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-226221.

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Kamf, Tobias. "High speed flywheel design : Using advanced composite materials." Thesis, Uppsala universitet, Elektricitetslära, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-181256.

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This thesis is a part of a larger project that focuses on the development of a highspeed, high energy flywheel using both high-tech composites and levitating magneticbearings alongside a custom made, permanent magnetized generator built into theflywheel itself. The goal of the project is then to integrate this flywheel into anelectrical vehicle.The main focus of this thesis is the composite material. The composite is to be usedas a shell around the flywheel rotor. This composite shell fills two purposes. The firstis to act as the main energy carrying material, storing above 75% of the total energy inthe flywheel. The second purpose it to strengthen the machine, holding it together.This so that higher speeds than normally possible can be achieved, with the goal beingset to 30 000rpm.In order to be able to design the composite shell correctly a method of calculating theload stresses had to be developed. This was done by the creation of a Matlabprogram, named Spin2Win, capable of calculating the stresses inside a compositemetal hybrid flywheel. Using said Matlab code, combined with modelling andsimulations from SolidWorks, a fully-fledged flywheel was designed complete withdrawings and material specifications.The composite analysis surprisingly shows that the best combination of compositematerials is a mixture of both high strength carbon fibres alongside softer glass fibrescoupled with the weight of the central core. This allowed for control of the radialstresses which was shown to otherwise be the limiting factor when designing rotatingcomposite materials.One of the most interesting, and perhaps even unique, parts of the design is that theelectrical machine has been integrated into the flywheel’s composite shell. Having thetwo entities working together in order to control the radial stresses in thecomposite, by utilizing the weight of the permanent magnets.

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Ho, Tracey 1976. "High-speed permanent magnet motor generator for flywheel energy storage." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/80068.

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Thesis (S.B. and M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1999.
Includes bibliographical references (p. 139).
by Tracey Chui Ping Ho.
S.B.and M.Eng.

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Talebi, Rafsanjan Salman. "Advanced high-speed flywheel energy storage systems for pulsed power application." [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-3163.

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Okou, Richard. "High Speed flywheel and test rig design for rural energy storage." Doctoral thesis, University of Cape Town, 2010. http://hdl.handle.net/11427/5130.

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There is considerable growth in the renewable energy sector to contribute to sustainable development, environmental conservation and most importantly to provide affordable energy to isolated rural communities of sub-Saharan Africa. Renewable energy sources such as solar and wind require energy storage since the source of energy is intermittent. Electrochemical batteries especially from lead acid are commonly used to store energy in Solar Home Systems (SHS) for rural electrification in sub-Saharan Africa. Disadvantages such as low efficiencies, low life cycle costs, high maintenance, comparatively short life and serious environmental and human toxicity effects exist. Since recycling is not widespread, replacement costs are high, as are the resultant environmental damage and health hazards from lead and sulphuric acid. In this thesis, an electromechanical flywheel energy storage device is proposed as an alternative to a lead acid battery in order to increase efficiency, life expectancy, increased high depth of discharge, low life cycle cost and elimination of adverse environmental effects. Due to income and service skill constraints in rural areas, the proposed, high speed flywheel systems (for long time energy storage) will require the use of low cost configurations and topologies, special considerations on the flywheel rotor profile design, robust electrical machines, simple power electronics and a low cost bearing set. Low loss magnetic bearings are also possible but were limited by time while also making their maintenance complex especially in rural areas. Conventional high strength composite materials used in flywheel rotor manufacture for high speed operation are expensive. Therefore there is a need to develop techniques to profile the rotor shape so as to improve on material usage and exhibit lower mechanical stresses. A robust electrical machine topology for high speed operation and a simple drive system are investigated to ensure simple assembly, low cost and low maintenance. vii The various flywheel components were designed using analytical and numerical methods. Two techniques were used to develop two optimal profiles for the flywheel rotor structure. Partial differential equations and analytical solutions were employed to develop the profiles. Analytical equations were used to design the electrical machine, drive, bearing system and other accessories. The final electromechanical battery prototype consisted of a composite flywheel rotor made from E-glass fibre materials, double rotor Axial Flux Permanent Magnet (AFPM) machine and a drive system using Brushless DC (BLDC) mode of operation. The system was designed for 300Wh of energy storage for the delivery of 100W and 500W of power and an operating speed range of 8,000 rpm-25,000 rpm. The design and development of the flywheel energy storage system and test rig using locally available materials was investigated. Experiments were conducted for speeds up to 6,000 rpm. The electromechanical battery was able to store a maximum of 77Wh of energy. The shortfall of the system to meet its design specifications was investigated and found to have been caused by vibrations resulting from prototyping issues. A thermal model was developed to predict the temperature rise in the system which showed a good correlation with the experimental results.

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Conteh, Michael Abu. "ENHANCEMENT OF HIGH-SPEED FLYWHEEL ENERGY STORAGE VIA CARBON-FIBER COMPOSITE REINFORCEMENT." OpenSIUC, 2016. https://opensiuc.lib.siu.edu/dissertations/1191.

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This study on the enhancement of high-speed flywheel energy storage is to investigate composite materials that are suitable for high-speed, high-energy density for energy storage and/or energy recovery. The main motivation of the study is to explore the application of the flywheel in the aviation industry for recovering some of the energy that is currently being lost at the wheel brakes of an aircraft due to the high temperature developed in the brake stack as a result of landing, frequent brake applications during taxiing in or out of heavy traffic airports and rejected take-off. Lamina and laminate mechanical properties of materials suitable for flywheel high-speed energy storage were investigated. Design and optimum stress analysis were used to determine the shape factor, maximum stress and energy density for a flywheel with a constant stress disk and a constant thickness rim. Analytical studies along with the use of the CADEC-online software were used to evaluate the lamina and laminate properties. This study found that the use of hybrid composite material with higher strength (based on first ply failure strength) and lower density and lower elastic moduli for the disk than the rim material will yield high-speed and high-energy density. The materials designed based on the results from this study show outperformance compared to previous published results of standard flywheel material combinations. The safe rotational velocity and energy density were found to be 166,000 RPM and 2.73 MJ/kg respectively. Therefore, results from this study will contribute to aiding further development of the flywheel that has recently re-emerged as a promising application for energy storage due to significant improvements in composite materials and technology. Further study on flywheel energy recovery from aircraft brakes revealed that more than half of the energy dissipated at the wheel brake as heat could be recovered and converted to some useful form. In this way, the operating life of the brakes can be prolonged. The total additional weight to the aircraft was found to be less than 0.2% of the maximum take-off weight. This additional weight can be offset by reducing the design payload while ensuring that the structural efficiency of the aircraft is not altered. It was also found that applying this method of flywheel energy recovery to active commercial Boeing-777 aircraft will result in savings equivalent to the annual carbon emission of a 6 MW fossil fuel power plant. This will also contribute to the aviation industry climate change mitigation.

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Shah, Sejul. "The design and development of a high speed composite flywheel for hybrid vehicles." Thesis, Imperial College London, 2007. http://hdl.handle.net/10044/1/7847.

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Cusack, Jessy L. "Design of a High Speed Clutch with Mechanical Pulse-Width Control." Digital WPI, 2013. https://digitalcommons.wpi.edu/etd-theses/173.

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Kinetic energy storage via flywheels is an emerging avenue for hybrid vehicle research, offering both high energy and power density compared to more established electric and hydraulic alternatives. However, connecting the high speed flywheel to the relatively low speed drivetrain of the vehicle is a persistent challenge, requiring a transmission with high variability and efficiency. A proposed solution drawing inspiration from the electrical domain is the Switch-Mode Continuously Variable Transmission (SM CVT), which uses a high speed clutch to transfer energy to a torsion spring in discrete pulses with a variable duty cycle. The greatest limitation to the performance of this system is the speed and efficiency of commercial clutch technology. It is the goal of this thesis to develop a novel clutch which meets the actuation speed, controllability, and efficiency requirements of the SM CVT, with potential for reapplication in other rotary mechanical systems with switching functionality. The performance demands of the clutch were derived via a theoretical design case based on the performance requirements of a typical passenger vehicle, indicating the need for a sub-millisecond engagement and disengagement cycle. This is not met by any conventional clutch. Several concepts were considered across the fluid, electromagnetic and mechanical energy domains. A final concept was chosen which employs a friction disk style architecture, with normal force produced by compressing springs via an axial cam mounted to the flywheel. To control duty cycle, the cam was designed with a radially varying profile such that increasing radial position results in proportionally increasing ratio of high dwell to low dwell. Three synchronized followers are then translated radially on the cam by a control linkage. Analysis of the follower train dynamics and system stiffness were carried out to inform the design of a scaled benchtop prototype. Experimental testing was carried out to characterize the performance of the prototype. It was found that the intended functionality of the design was achieved, with discrete energy transfer accomplished via pulsing of the clutch. However, maximum efficiency was only 33% and torque capacity was only 65% of the intended 70Nm. Significant opportunity exists for improvement of the clutch performance in future research.

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Park, Jae Do Hofman Heath F. "Modeling and control of a high-speed solid-rotor synchronous reluctance flywheel motor/generator." [University Park, Pa.] : Pennsylvania State University, 2007. http://etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-1881/index.html.

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10

Schaible, Uwe. "An integrated high speed flywheel energy storage system for peak power transfer in electric vehicles /." *McMaster only, 1997.

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11

Schaible, Uwe. "An integrated high-speed flywheel energy storage system for peak power transfer in electric vehicles." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0003/NQ42763.pdf.

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12

Moreira, Alfonso. "Characterization and dynamic analysis of damping effects in composite materials for high-speed flywheel applications." Auburn, Ala., 2007. http://repo.lib.auburn.edu/2007%20Spring%20Dissertations/MOREIRA_ALFONSO_55.pdf.

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13

Frölander, Simon, and André Säll. "Implementing Gyroscopic Stabilization : A study on performance and power consumption correlated to flywheel rotational speed." Thesis, KTH, Maskinkonstruktion (Inst.), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-226681.

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In this study the stability as well as the power consumptionof an implemented gyroscopic stabilizer, when varying therotational speed of the flywheel, was investigated. A fullyfunctional demonstrator was constructed utilizing two DCmotors for driving the flywheel and rotating the gimbal,respectively. To control the stabilization an Arduino Unowith a PID-controller was used, measurements were madewith a second Arduino Uno. Three tests were conducted:no disturbances, a short impulse, and a constant force appliedto the demonstrator. The results showed that theperformance in all three tests increased with a higher rotationalspeed of the flywheel, and that the biggest source ofpower consumption was the flywheel DC motor.
I den här studien undersöktes stabiliteten såväl som effektförbrukningen av en implementerad gyroskopisk stabilisatornär svänghjulets rotationshastighet varierades. Enfullt fungerande demonstrator konstruerades vilken användesig av två likströmsmotorer för att driva svänghjulet respektiveden kardanska upphängningen. För att reglera stabiliseringenanvändes en Arduino Uno med en PID-regulator,mätningar gjordes med en andra Arduino Uno. Tre testergenomfördes: inga störningar, en kort impuls, och en konstantkraft applicerad till demonstratorn. Resultaten visadeatt prestandan i alla tre testerna förbättrades meden högre rotationshastighet hos svänghjulet, och att denstörsta källan till effektförbrukning var svänghjulslikströmsmotorn.

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Nilsson, Magnus. "Modelingflywheel-Speed Variations Based on Cylinder Pressure." Thesis, Linköping University, Department of Electrical Engineering, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-2333.

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Combustion supervision by evaluating flywheel speed variations is a common approach in the automotive industry. This often involves preliminary measurements. An adequate model for simulating flywheel speed can assist to avoid some of these preliminary measurements.

A physical nonlinear model for simulating flywheel speed based on cylinder pressure information is investigated in this work. Measurements were conducted at Scania in a test bed and on a chassis dynamometer. The model was implemented in MATLAB/Simulink and simulations are compared to measured data. The first model can not explain all dynamics for the measurements in the test bed so extended models are examined. A model using a dynamically equivalent model of the crank-slider mechanism shows no difference from the simple model, whereas a model including a driveline can explain more from the test-bed measurements. When simulating the setups used at the chassis dynamometer, the simplest model works best. Yet, it is not very accurate and it is proposed that optimization of parameter values might improve the model further. A sensitivity analysis shows that the model is fairly robust to parameter changes.

A continuation of this work might include optimization to estimate parameter values in the model. Investigating methods for combustion supervision may also be a future issue.

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Myburgh, Stefan. "The development of a fully suspended AMB system for a high-speed flywheel application / Stefan Myburgh." Thesis, North-West University, 2007. http://hdl.handle.net/10394/2314.

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Martinez-Gonzalez, Pablo. "A study on the integration of a high-speed flywheel as an energy storage device in hybrid vehicles." Thesis, Imperial College London, 2010. http://hdl.handle.net/10044/1/6082.

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The last couple of decades have seen the rise of the hybrid electric vehicle as a compromise between the outstanding specific energy of petrol fuels and its low-cost technology, and the zero tail-gate emissions of the electric vehicle. Despite this, considerable reductions in cost and further increases in fuel economy are needed for their widespread adoption. An alternative low-cost energy storage technology for vehicles is the high-speed flywheel. The flywheel has important limitations that exclude it from being used as a primary energy source for vehicles, but its power characteristics and low-cost materials make it a powerful complement to a vehicle's primary propulsion system. This thesis presents an analysis on the integration of a high-speed flywheel for use as a secondary energy storage device in hybrid vehicles. Unlike other energy storage technologies, the energy content of the flywheel has a direct impact on the velocity of transmission. This presents an important challenge, as it means that the flywheel must be able to rotate at a speed independent of the vehicle's velocity and therefore it must be coupled via a variable speed transmission. This thesis presents some practical ways in which to accomplish this in conventional road vehicles, namely with the use of a variator, a planetary gear set or with the use of a power-split continuously variable transmission. Fundamental analyses on the kinematic behaviour of these transmissions particularly as they pertain to flywheel powertrains are presented. Computer simulations were carried out to compare the performance of various transmissions, and the models developed are presented as well. Finally the thesis also contains an investigation on the driving and road conditions that have the most beneficial effect on hybrid vehicle performance, with a particular emphasis on the effect that the road topography has on fuel economy and the significance of this.

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17

Östling, Johan. "High Accuracy Speed and Angular Position Detection by Dual Sensor." Thesis, Uppsala universitet, Fasta tillståndets fysik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-365726.

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For many decades there has been a need in many industries to measure speed and position of ferrous gears. This is commonly done by converting passing gear teeth from trigger wheels to electrical impulses to calculate speed and angular position. By using Hall effect sensors or Giant Magnetoresistance sensors (GMR), a zero speed detection of gear teeth is possible while at the same time be cheap to produce and durable for harsh environments. A specially designed trigger-wheel (cogwheel created for measurements) with gear teeth in a specific pattern, exact position can be detected by using a dual sensor, even when no earlier information is available. The new design of trigger-wheel also makes this new method more accurate and universal compared to previous solutions. This thesis demonstrates and argues for the advantages of using a dual sensor for speed and angular position detection on gear wheels. Were one sensor do quantitative measurements for pattern detection in the teeth arrangements and the other sensor do qualitative measurements for position detection.

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Mwaba, Gomezyani. "Permanent Magnet Machine Topologies for high speed flywheels." Thesis, University of Cape Town, 2009. http://hdl.handle.net/11427/5145.

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Carlin, Marc J. (Marc Joseph). "Design of a high-speed motor-alternator for flywheele energy storage systems." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/43532.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.
Includes bibliographical references (p. 149-150).
by Marc J. Carlin.
M.Eng.

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20

Ježek, Michal. "Realizace inverzního kyvadla typu Cubli." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-399423.

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This master thesis deals with the development and construction of the inverted pendulum, inspired by the Cubli project. The objective is to develop and design an inverted pendulum, in the shape of one side of the cube balancing at one of its corner and for balancing is used the flywheel. For its design 3D printing is used to the maximum extent and as the electronic parts commonly available components at an affordable price are used. The design of the construction and the components allow the construction of a complete cube, without the need of further development or fundamental changes in the design of the model. For the calculations and the design of the controller the Matlab / Simulink software was used. As the controller algorithm the LQR algorithm is used with added integral feedback, to minimize control error. The 3D models of the single parts are created with FreeCAD software and printed on a 3D Prusa i3 MK2S printer.

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21

Wang, Wensen. "Design of high speed flywheel motor/generator for aerospace applications." 2004. http://etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-704/index.html.

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22

Flynn, Mark Matthew. "A methodology for evaluating and reducing rotor losses, heating, and operational limitations of high-speed flywheel batteries." 2003. http://wwwlib.umi.com/cr/utexas/fullcit?p3116306.

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23

Ke, Chou-fang, and 柯宙芳. "Dynamic Responses of the High Speed Intermittent Systems with Variable Inertia Flywheels." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/42764479297116796975.

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碩士
國立中山大學
機械與機電工程學系研究所
98
The effect of variable inertia flywheel (VIF) on the driving speed fluctuation, and residual vibration of high speed machine systems is investigated in this thesis. Different variable inertia flywheels are proposed to an experimental purpose roller gear cam system and a commercial super high speed paper box folding machine. The effects of time varying inertia and intermittent cam motion on the dynamic responses of different high speed cam droved mechanism systems are simulated numerically. The nonlinear time varied system models are derived by applying the Lagrange’s equation and torque-equilibrium equations. The dynamic responses of these two nonlinear systems under different operating speed are simulated by employing the 4th order Runge-Kutta method. The effects of VIF parameters on the dynamic responses, i.e. the output precision, variation of motor speed, and torque, during the active and dwell periods for these two systems are studied and discussed. The difference between the dynamic responses of constant inertia and variable inertia flywheel systems are also compared. The feasibility and effectiveness of depression of driving speed and torque fluctuations by analying variable inertia flywheel has also been demonstrated.

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Dissertations / Theses on the topic 'Flywheel speed'

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