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A Possibilistic Approach to Rotorcraft Design through a Multi-Objective Evolutionary AlgorithmChae, Han Gil 24 August 2006 (has links)
A method to find solutions to multi-objective design problems that involve poor information available was proposed. The method quantified the designers intuition in a systematic manner, and utilized it to approximate inaccurate and/or vague numbers. In the context of possibility theory, uncertain values were expressed through possibility distributions, i.e. fuzzy membership functions. Based on the membership functions of the value, levels of confidence of the solutions to multi-objective problems were defined through the notions of possibility and necessity. An evolutionary algorithm was modified to find sets of solutions that allow certain levels of confidence instead of the crisp sets of the solutions. The method was applied to a design problem of the gyrodyne configuration and sets of the solutions of the specified possibility and necessity were found. The results of the design problem and the suggestions for future research were discussed.
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Drive System of Electrical Lighter Vehicle with Brushless DC MachineLu, Wei-i 05 February 2010 (has links)
A drive system of the electrical lighter vehicle with the brushless DC machine is developed in the thesis. The system consists of a control unit based on a digital signal processor (DSP) and a drive module which combines a drive circuit, a brushless DC machine, and associated wheels. The motive power is delivered directly to the wheels without a power transmission system. The driving comments and the monitored signals between the modules and the control unit are communicated by the Controller Area Network (CAN) Bus. Each module can be controlled independently. By modifying the software of the system, the proposed drive system can be implemented in various electrical vehicles without changing circuit design. The developed system can be operated at forward, backward, and rotating motions. By limiting the armature current, the vehicle can be operated under the power saving mode. During the regenerative braking, the battery set is charged by the regenerative current. The experimental results show that the highest efficiency of the machine is 80 % with the motoring operation.
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The Impacts of Japan's Industry-University Cooperation System on the Electric Vehicles Industry : Case Study of SIM-Drive Corporation and Keio UniversityFan, Che-Chien 19 June 2012 (has links)
Industry-University Cooperation Systems are used by government, private enterprises and universities to adapt to a changing world environment spurred on by technological development. These systems can promote a nation¡¦s human resources as a result of research and development or the establishment of new ventures. They also complement knowledge and technology and promote the connection of academia and its application in order to push the nation¡¦s competitive power forward. Taiwan¡¦s Industry-University Cooperation system is similar, but younger than Japan¡¦s. Based on the Flying-Geese Model, a development of countries in Asia, Japan has always held the top ranking of technology management and innovation. Therefore it would be worthwhile for Taiwan to imitate Japan¡¦s Industry-University Cooperation system.
The range of the Industry-University Cooperation system is fairly wide, therefore this research paper will study the effects of Japan¡¦s system and the development of the Electric Vehicle industry. The Electric Vehicle (EV) industry offers effective solutions to the problems of global warming and rapid energy depletion. Among advanced countries, Japan has been the most serious in developing an EV industry and has developed advanced technology. Japan¡¦s government has started to combine research and industry in recent years. It has also tried to make policy that is based on technological development and popularizes the EV and eco-friendly car.
This research attempts to explain the main links between the Industry-University Cooperation system and the EV industry, including the extent of effectiveness and superiority. This thesis is an analysis of a case study of the cooperation between SIM-Drive Corporation and Keio University. By understanding Japan¡¦s Industry-University cooperation system, Taiwan¡¦s EV industry circles will be more able to connect with academic circles and gain EV development experience by learning from Japan.
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Inflow Performance Relationships (IPR) for Solution Gas Drive Reservoirs -- a Semi-Analytical ApproachNass, Maria A. 2010 May 1900 (has links)
This work provides a semi-analytical development of the pressure-mobility behavior of solution gas-drive reservoir systems producing below the bubble point pressure. Our primary result is the "characteristic" relation which relates normalized (or dimensionless) pressure and mobility functions. This formulation is proven with an exhaustive numerical simulation study consisting of over 900 different cases. We considered 9 different pressure-volume-temperature (PVT) sets, and 13 different relative permeability cases in the simulation study. We also utilized 7 different depletion scenarios.
The secondary purpose of this work was to develop a correlation of the "characteristic parameter" as a function of rock and fluid properties evaluated at initial reservoir conditions such as: API density, GOR, formation volume factor, viscosity, reservoir pressure, reservoir temperature, oil saturation, relative permeability end points, corey exponents and oil mobility:
We did successfully correlate the characteristic parameter as a function of these variables, which proves that we can uniquely represent the pressure-mobility path during depletion with specific reservoir and fluid property variables, taken as constant values for a particular case.
The functional form of our correlation along with all relevant equations are shown on the body of this document.
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Robust Generator System Using PM Assisted Synchronous Reluctance Generator with Current-fed DriveBaek, Jeihoon 2009 December 1900 (has links)
The growth of embedded generation and portable electrical installations has led
to an increased demand for low cost, flexible and reliable generator systems for military
and commercial applications. An interior permanent magnet (IPM) machine has high
power density due to its reluctance torque and magnetic torque components so it can
produce a large constant power-speed range. However, an IPM machine needs
demagnetizing current at high-speed during the flux-weakening region and thus develops
an inverter shutdown problem in an uncontrolled generator mode operation. In order to
overcome the disadvantages of the IPM machine, the permanent magnet assisted
synchronous reluctance generator (PMa-SynRG) can be a good solution for low cost,
high efficiency reliable generator systems. A PMa-SynRG can produce a high efficiency
drive by utilizing the proper amount of magnet and reluctance torque. This work
proposes a PMa-SynRG with two flux barriers and permanent magnets embedded in the
second layer of the rotor. A neodymium magnet (NdFeB) was used as permanent magnets in the rotor to prevent demagnetization. Finding the minimum amount of
magnet is one of the goals of the optimization process.
The objectives of this work are to build an optimal design for the 3kW generator
and an advanced power electronics converter for the PMa-SynRG drive system. In order
to find the optimized 3kW machine, a Lumped Parameter Model (LPM) was used to
achieve fast computation, and Differential Evolution Strategy (DES) was used to embed
the LPM in an efficient numerical optimization routine to identify optimum designs.
Finite Element Analysis (FEA) was used for test performance of optimum designs. On
the basis of differences between LPM and FEA, model predictions were used to fine
tune the LPM model. For new optimum design converges, numerical optimizations and
iterations were performed to produce LPM and FEA predictions.
For the drive system, the thyristor based, current-fed drive is much simpler and
has lower power losses compared to the pulse width modulation (PWM) drive.
Eliminating the requirement for self-controlled switches is a distinct advantage for lower
cost. Another feature of the developed current-fed drive is its inherent capability to
provide generating action by making the PMa-SynRG operates as a generator, rectifying
the phase voltages by means of the three-phase rectifier and feeding the power into the
load. These features make the current-fed drive a good candidate for driving any type of
synchronous generators including the proposed PMa-SynRG.
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Performance Evaluation of a Cascaded H-Bridge Multi Level Inverter Fed BLDC Motor Drive in an Electric VehicleEmani, Sriram S. 2010 May 1900 (has links)
The automobile industry is moving fast towards Electric Vehicles (EV); however this paradigm shift is currently making its smooth transition through the phase of Hybrid Electric Vehicles. There is an ever-growing need for integration of hybrid energy sources especially for vehicular applications. Different energy sources such as batteries, ultra-capacitors, fuel cells etc. are available. Usage of these varied energy sources alone or together in different combinations in automobiles requires advanced power electronic circuits and control methodologies.
An exhaustive literature survey has been carried out to study the power electronic converter, switching modulation strategy to be employed and the particular machine to be used in an EV. Adequate amount of effort has been put into designing the vehicle specifications. Owing to stronger demand for higher performance and torque response in an EV, the Permanent Magnet Synchronous Machine has been favored over the traditional Induction Machine.
The aim of this thesis is to demonstrate the use of a multi level inverter fed Brush Less Direct Current (BLDC) motor in a field oriented control fashion in an EV and make it follow a given drive cycle. The switching operation and control of a multi level inverter for specific power level and desired performance characteristics is investigated. The EV has been designed from scratch taking into consideration the various factors such as mass, coefficients of aerodynamic drag and air friction, tire radius etc. The design parameters are meant to meet the requirements of a commercial car. The various advantages of a multi level inverter fed PMSM have been demonstrated and an exhaustive performance evaluation has been done.
The investigation is done by testing the designed system on a standard drive cycle, New York urban driving cycle. This highly transient driving cycle is particularly used because it provides rapidly changing acceleration and deceleration curves. Furthermore, the evaluation of the system under fault conditions is also done. It is demonstrated that the system is stable and has a ride-through capability under different fault conditions. The simulations have been carried out in MATLAB and Simulink, while some preliminary studies involving switching losses of the converter were done in PSIM.
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Analysis and Simulation of Mechanical Trains Driven by Variable Frequency Drive SystemsHan, Xu 2010 December 1900 (has links)
Induction motors and Variable Frequency Drives (VFDs) are widely used in industry to drive machinery trains. However, some mechanical trains driven by VFD-motor systems have encountered torsional vibration problems. This vibration can induce large stresses on shafts and couplings, and reduce the lifetime of these mechanical parts. Long before the designed lifetime, the mechanical train may encounter failure. This thesis focuses on VFDs with voltage source rectifiers for squirrel-cage induction motors of open-loop Volts/Hertz and closed-loop Field Oriented Control (FOC). First, the torsional vibration problems induced by VFDs are introduced. Then, the mathematical model for a squirrel-cage induction motor is given. Two common control methods used in VFD are discussed - open-loop Volts/Hertz and closed-loop FOC. SimPowerSystems and SimMechanics are used as the modeling software for electrical systems and mechanical systems respectively. Based on the models and software, two interface methods are provided for modeling the coupled system. A simple system is tested to verify the interface methods. The study of open-loop Volts/Hertz control method is performed. The closed-form of electromagnetic torque sideband frequency due to Pulse Width Modulation is given. A torsional resonance case is illustrated. The effects of non-ideal power switches are studied, which shows little in uence on the system response but which uses little energy consumption. A study of a non-ideal DC bus indicates that a DC bus voltage ripple can also induce a big torsional vibration. Next, the study of the closed-loop FOC control method is presented. Simulation for a complete VFD machinery train is performed. With the recti er and DC bus dynamic braking, the system shows a better performance than the ideal-DC bus case. Lastly, a parametric study of the FOC controller is performed. The effects of primary parameters are discussed. The results indicate that some control parameters (i.e. speed ramps, proportional gain in speed PI controller) are also responsible for the mechanical torsional vibration.
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A Novel Algorithm For Prediction Off-line Stator Leakage Inductance And On-line Stator Resistance Of Induction MotorsSezgin, Volkan 01 January 2009 (has links) (PDF)
In vector control of induction motors it is essential to know the parameters of the motor. Known approaches to this problem have some drawbacks. This thesis work is planned to develop solutions to the existing problems. The proposed solutions will be implemented and tested.
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System Identification for Transmission Mechanism by Using Genetic AlgorithmsChen, Ing-Hao 12 July 2000 (has links)
In this study, the use of modified genetic algorithms (MGA) in the parameterization of the Transmission Mechanisms is facilitated. The new algorithm is proposed from the genetic algorithm with some additional strategies, and yields a faster convergence and a more accurate search. Firstly, this near-optimum search technique, MGA-based ID method, is used to identify the parameters of a system described by an ARMAX model in the presence of white noise and to compare with the LMS (Least mean-squares) method and GA method. Then, this proposed algorithm is applied to the identification of the Transmission Mechanisms of DC motor. The parameters of the friction force and DC motor are estimated in a single identification experiment. It is also shown that this technique is capable of identifying the whole transmission system. Finally, the Minimum Variance Controller (MVC) is taken to track the desired speed trajectory and then a comparison to the conventional digital PID controller is shown. Experiment results are included to demonstrate the excellent performance of the MVC.
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Design of Distributed-Flow-Type Multi-Speed Hubs for BicyclesWen, Tzu-chuang 01 September 2008 (has links)
The planetary gear train are applied in multi-speed drive hubs for bicycles. Since a multi-speed drive hub has the advantages of the small volume and stable gear shifting, it is used widely in folding bicycles and electric bicycles. The distributed-flow-type multi-speed hubs could provide more gears, the related design theory is not well development. Thus, the purpose of this research is to develop a systematical methodology for the design of the distributed-flow-type multi-speed hub for bicycles. First, an existing patent is analyzed to identify the basic characteristics and the requirements of the multi-speed hubs. Based on the basic characteristics and the requirements, a systematical procedure is proposed to synthesize the feasible concepts of the planetary gear trains. Second, another procedure is proposed to determine the feasible clutching sequence tables. Third, the difference in value of the angular velocity is assigned to calculate the gear ratio and to determine the numbers of the teeth of all gears. Finally, the shifting-gear system in the multi-speed drive hubs is designed and arranged. The evaluation of the multi-speed drive hubs is proceeded to select the better alternatives. The result of this work obtains twenty-senven types of the distributed-flow multi-speed hubs for bicycles, three of them could reach sixteen speeds.
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