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The University of Texas at Austin
The University of Texas at Austin Institute for Advanced Technology, The University of Texas at Austin - AUSA - February 2006 IAT Talk 1358 Eraser Institute for Advanced Technology, The University of Texas at Austin - AUSA - February 2006 IAT Talk 1358 Transitioning EM Railgun Technology to the Warfighter Dr. Harry D. Fair, Director Institute for Advanced Technology The University of Texas at Austin The Governator is correct! • At the IAT, we are harnessing large quantities of electric energy to enable radically new capabilities for the warfighter. • These new electric weapons are capable of accelerating high energy hypervelocity projectiles Electric guns are real. from electric railguns on land, sea, and air platforms, and are capable of protecting these platforms by electromagnetic protection systems. Institute for Advanced Technology, The University of Texas at Austin - AUSA - February 2006 IAT Talk 1358 Hypervelocity Electromagnetic Railguns What are they? How do they work? Why change to electromagnetic energy? How can we use them? When can we have them? What are the implications for the Army and the Navy? Institute for Advanced Technology, The University of Texas at Austin - AUSA - February 2006 IAT Talk 1358 What is an Electromagnetic Railgun? Converts Electricity to Kinetic Energy The barrel can have any cross section - round, The accelerating Force square, rectangular is provided by Electromagnetic Forces and can accelerate projectiles to very high velocities Force Muzzle view We routinely launch projectiles to hypervelocities -
Pulsed Rotating Machine Power Supplies for Electric Combat Vehicles
Pulsed Rotating Machine Power Supplies for Electric Combat Vehicles W.A. Walls and M. Driga Department of Electrical and Computer Engineering The University of Texas at Austin Austin, Texas 78712 Abstract than not, these test machines were merely modified gener- ators fitted with damper bars to lower impedance suffi- As technology for hybrid-electric propulsion, electric ciently to allow brief high current pulses needed for the weapons and defensive systems are developed for future experiment at hand. The late 1970's brought continuing electric combat vehicles, pulsed rotating electric machine research in fusion power, renewed interest in electromag- technologies can be adapted and evolved to provide the netic guns and other pulsed power users in the high power, maximum benefit to these new systems. A key advantage of intermittent duty regime. Likewise, flywheels have been rotating machines is the ability to design for combined used to store kinetic energy for many applications over the requirements of energy storage and pulsed power. An addi - years. In some cases (like utility generators providing tran- tional advantage is the ease with which these machines can sient fault ride-through capability), the functions of energy be optimized to service multiple loads. storage and power generation have been combined. Continuous duty alternators can be optimized to provide Development of specialized machines that were optimized prime power energy conversion from the vehicle engine. for this type of pulsed duty was needed. In 1977, the laser This paper, however, will focus on pulsed machines that are fusion community began looking for an alternative power best suited for intermittent and pulsed loads requiring source to capacitor banks for driving laser flashlamps. -
Arxiv:1701.07063V2 [Physics.Ins-Det] 23 Mar 2017 ACCEPTED by IEEE TRANSACTIONS on PLASMA SCIENCE, MARCH 2017 1
This work has been accepted for publication by IEEE Transactions on Plasma Science. The published version of the paper will be available online at http://ieeexplore.ieee.org. It can be accessed by using the following Digital Object Identifier: 10.1109/TPS.2017.2686648. c 2017 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, including reprinting/republishing this material for advertising or promotional purposes, collecting new collected works for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. arXiv:1701.07063v2 [physics.ins-det] 23 Mar 2017 ACCEPTED BY IEEE TRANSACTIONS ON PLASMA SCIENCE, MARCH 2017 1 Review of Inductive Pulsed Power Generators for Railguns Oliver Liebfried Abstract—This literature review addresses inductive pulsed the inductor. Therefore, a coil can be regarded as a pressure power generators and their major components. Different induc- vessel with the magnetic field B as a pressurized medium. tive storage designs like solenoids, toroids and force-balanced The corresponding pressure p is related by p = 1 B2 to the coils are briefly presented and their advantages and disadvan- 2µ tages are mentioned. Special emphasis is given to inductive circuit magnetic field B with the permeability µ. The energy density topologies which have been investigated in railgun research such of the inductor is directly linked to the magnetic field and as the XRAM, meat grinder or pulse transformer topologies. One therefore, its maximum depends on the tensile strength of the section deals with opening switches as they are indispensable for windings and the mechanical support. -
Open Fwong Phd Dissertation.Pdf
The Pennsylvania State University The Graduate School Department of Chemistry CATALYTIC NANOMOTORS AND MICROPUMP SYSTEMS UTILIZING ALTERNATE FUELS A Dissertation in Chemistry by Flory K. Wong © 2016 Flory K. Wong Submitted in Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy December 2016 ii The dissertation of Flory K. Wong was reviewed and approved* by the following: Ayusman Sen Distinguished Professor of Chemistry Dissertation Advisor Chair of Committee Thomas E. Mallouk Evan Pugh University Professor of Chemistry, Biochemistry, Molecular Biology, and Physics Head of the Department of Chemistry Raymond E. Schaak DuPont Professor of Materials Chemistry Darrell Velegol Distinguished Professor of Chemical Engineering *Signatures are on file in the Graduate School. iii ABSTRACT Colloidal assemblies of self-powered active particles have become a focus area of research. Ranging from microscopic particle suspensions to nanoscale molecules, these systems transduce chemical energy into mechanical motion across multiple length scales following a variety of mechanisms. Understanding the energy transduction processes and the subsequent nature of particle dynamics offers unprecedented opportunities to explore the physics of small-scale colloidal systems and to harness their behavior in many useful applications. However, over a decade after the initial discovery of autonomous bimetallic nanorods, we continue to struggle to bring such systems into real-world applications. Part of the setback has been the in-depth research into hydrogen peroxide fuel. While the studies have built up the fundamental knowledge necessary for the advancement of the field, we have yet to do the same for other systems that employ alternate fuels. This dissertation aims to fill that void by developing nano- and micromotor and pump systems that does not rely on traditional hydrogen peroxide fuel, uses novel material by taking inspiration in other areas of research, and complete in-depth studies to provide a clear understanding of such systems. -
Design and Optimization of an Electromagnetic Railgun
Michigan Technological University Digital Commons @ Michigan Tech Dissertations, Master's Theses and Master's Reports 2018 DESIGN AND OPTIMIZATION OF AN ELECTROMAGNETIC RAILGUN Nihar S. Brahmbhatt Michigan Technological University, [email protected] Copyright 2018 Nihar S. Brahmbhatt Recommended Citation Brahmbhatt, Nihar S., "DESIGN AND OPTIMIZATION OF AN ELECTROMAGNETIC RAILGUN", Open Access Master's Report, Michigan Technological University, 2018. https://doi.org/10.37099/mtu.dc.etdr/651 Follow this and additional works at: https://digitalcommons.mtu.edu/etdr Part of the Controls and Control Theory Commons DESIGN AND OPTIMIZATION OF AN ELECTROMAGNETIC RAIL GUN By Nihar S. Brahmbhatt A REPORT Submitted in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE In Electrical Engineering MICHIGAN TECHNOLOGICAL UNIVERSITY 2018 © 2018 Nihar S. Brahmbhatt This report has been approved in partial fulfillment of the requirements for the Degree of MASTER OF SCIENCE in Electrical Engineering. Department of Electrical and Computer Engineering Report Advisor: Dr. Wayne W. Weaver Committee Member: Dr. John Pakkala Committee Member: Dr. Sumit Paudyal Department Chair: Dr. Daniel R. Fuhrmann Table of Contents Abstract ........................................................................................................................... 7 Acknowledgments........................................................................................................... 8 List of Figures ................................................................................................................ -
Improvement of Electromagnetic Railgun Barrel Performance and Lifetime By
IMPROVEMENT OF ELECTROMAGNETIC RAILGUN BARREL PERFORMANCE AND LIFETIME BY METHOD OF INTERFACES AND AUGMENTED PROJECTILES A Thesis Presented to the Faculty of California Polytechnic State University San Luis Obispo In Partial Fulfillment of the Requirements for the Degree Master of Science in Aerospace Engineering by Aleksey Pavlov June 2013 c 2013 Aleksey Pavlov ALL RIGHTS RESERVED ii COMMITTEE MEMBERSHIP TITLE: Improvement of Electromagnetic Rail- gun Barrel Performance and Lifetime by Method of Interfaces and Augmented Pro- jectiles AUTHOR: Aleksey Pavlov DATE SUBMITTED: June 2013 COMMITTEE CHAIR: Kira Abercromby, Ph.D., Associate Professor, Aerospace Engineering COMMITTEE MEMBER: Eric Mehiel, Ph.D., Associate Professor, Aerospace Engineering COMMITTEE MEMBER: Vladimir Prodanov, Ph.D., Assistant Professor, Electrical Engineering COMMITTEE MEMBER: Thomas Guttierez, Ph.D., Associate Professor, Physics iii Abstract Improvement of Electromagnetic Railgun Barrel Performance and Lifetime by Method of Interfaces and Augmented Projectiles Aleksey Pavlov Several methods of increasing railgun barrel performance and lifetime are investigated. These include two different barrel-projectile interface coatings: a solid graphite coating and a liquid eutectic indium-gallium alloy coating. These coatings are characterized and their usability in a railgun application is evaluated. A new type of projectile, in which the electrical conductivity varies as a function of position in order to condition current flow, is proposed and simulated with FEA software. The graphite coating was found to measurably reduce the forces of friction inside the bore but was so thin that it did not improve contact. The added contact resistance of the graphite was measured and gauged to not be problematic on larger scale railguns. The liquid metal was found to greatly improve contact and not introduce extra resistance but its hazardous nature and tremendous cost detracted from its usability. -
Unit VI Superconductivity JIT Nashik Contents
Unit VI Superconductivity JIT Nashik Contents 1 Superconductivity 1 1.1 Classification ............................................. 1 1.2 Elementary properties of superconductors ............................... 2 1.2.1 Zero electrical DC resistance ................................. 2 1.2.2 Superconducting phase transition ............................... 3 1.2.3 Meissner effect ........................................ 3 1.2.4 London moment ....................................... 4 1.3 History of superconductivity ...................................... 4 1.3.1 London theory ........................................ 5 1.3.2 Conventional theories (1950s) ................................ 5 1.3.3 Further history ........................................ 5 1.4 High-temperature superconductivity .................................. 6 1.5 Applications .............................................. 6 1.6 Nobel Prizes for superconductivity .................................. 7 1.7 See also ................................................ 7 1.8 References ............................................... 8 1.9 Further reading ............................................ 10 1.10 External links ............................................. 10 2 Meissner effect 11 2.1 Explanation .............................................. 11 2.2 Perfect diamagnetism ......................................... 12 2.3 Consequences ............................................. 12 2.4 Paradigm for the Higgs mechanism .................................. 12 2.5 See also ............................................... -
B.Tech. - AGRICULTURAL ENGINEERING Syllabus
B.Tech. - AGRICULTURAL ENGINEERING Syllabus I Year I – Semester (HS103) ENGINEERING MATHEMATICS – I L T P To C 3 1 - 4 4 UNIT – I Matrices : Matrices, Rank of a matrix, Solutions of system of linear equations, Gauss- Jordan, Gauss Elimination, Eigen values, Eigen vectors, Cayley-Hamilton theorem - Applications, Diagonalisation of a matrix. UNIT - II Ordinary Differential Equations: Revision of integral formulae, Formation of ordinary differential equations, Differential equations of first order and first degree – linear, Bernoulli and exact. Applications to Newton’s Law of cooling, Law of natural growth and decay, Orthogonal trajectories.Non-homogeneous linear differential equations of second and higher order with constant coefficients with RHS term of the type e, Sin ax, Cos ax, polynomials in x, method of variation of parameters UNIT – III Frobenius Series Solution: Frobenius series solution of differential equations (constant and variable coefficients) UNIT – IV Laplace Transformations : Definitions and properties, Laplace transform of standard functions, Inverse transform, first shifting Theorem, Transforms of derivatives and integrals, Unit step function, second shifting theorem, Dirac’s delta function, Convolution theorem, Differentiation and integration of transforms, Application of Laplace transforms to ordinary differential equations. UNIT - V Numerical Methods: Solutions of Algebraic and Transcendental equations: Bisection method, Regula-Falsi method, Newton-Raphson method, Numerical solutions of algebraic system of equations by Gauss-Siedel method. Interpolation: Errors in polynomial interpolation, Finite differences, Forward, backward and central differences, Newton’s formulae for interpolation, Central difference interpolation formulae, Gauss and Bessel central difference formulae, interpolation with unevenly spaced points, Lagrange’s interpolation formula. Curve fitting by least squares method, solving differential equations by numerical methods – Euler’s, Modified Eulers, RK method. -
1 Introduction
1 1 Introduction 1.1 Global Challenges Water, food, and energy security represent major challenges to the stability and continuity of human populations. However, rapid population growth and steadily improving living standards place enormous pressures on already stressed water resource and agricultural systems. Large amounts of energy are consumed to produce clean water and to treat wastewaters prior to their return to the environ- ment, which inevitably leads to a considerable amount of carbon dioxide (CO2) emissions as well as releasing other environmental pollutants. At the global scale, about 2600 km3 of water are withdrawn to supply food- driven irrigation needs every year. Viewed another way, agriculture consumes nearly 70% of total human freshwater withdrawals. This number is to increase to more than 83% by 2050 to meet the growing food demand by the rapidly growing population. In the last 25 years, access to water with potable quality has gone up from 75% to 90% of the world population, and, nevertheless, 884 million people nowadays still lack access to adequate drinking water in many geographical regions [1]. Thus, ensuring a stable and sustainable water, food, and energy supply into the future is a priority for all nations. Adding to an already dreadful situation, water pollution is becoming a major global challenge [2, 3]. From the United Nations World Water Development Report in 2018, it is said that more than 2 billion people lack access to safe drink- ing water and more than double that number lack access to safe sanitation. With a rapidly growing global population, demand for water is expected to increase by nearly one-third by 2050 [4]. -
31295005665780.Pdf
DESIGN AND CONSTRUCTION OF A THREE HUNDRED kA BREECH SIMULATION RAILGUN by BRETT D. SMITH, B.S. in M.E. A THESIS IN -ELECTRICAL ENGINEERING Submitted to the Graduate Faculty of Texas Tech University in Partial Fulfillment of the Requirements for the Degree of MASTER OF SCIENCE IN ELECTRICAL ENGINEERING Jtpproved Accepted December, 1989 ACKNOWLEDGMENTS I would like to thank Dr. Magne Kristiansen for serving as the advisor for my grad uate work as well as serving as chairman of my thesis committee. I am also appreciative of the excellent working environment provided by Dr. Kristiansen at the laboratory. I would also like to thank my other two thesis committee members, Dr. Lynn Hatfield and Dr. Edgar O'Hair, for their advice on this thesis. I would like to thank Greg Engel for his help and advice in the design and construc tion of the experiment. I am grateful to Lonnie Stephenson for his advice and hard work in the construction of the experiment. I would also like to thank Danny Garcia, Mark Crawford, Ellis Loree, Diana Loree, and Dan Reynolds for their help in various aspects of this work. I owe my deepest appreciation to my parents for their constant support and encour agement. The engineering advice obtained from my father proved to be invaluable. 11 CONTENTS .. ACKNOWLEDGMENTS 11 ABSTRACT lV LIST OF FIGURES v CHAPTER I. INTRODUCTION 1 II. THEORY OF RAILGUN OPERATION 4 III. DESIGN AND CONSTRUCTION OF MAX II 27 Railgun System Design 28 Electrical Design and Construction 42 Mechanical Design and Construction 59 Diagnostics Design and Construction 75 IV. -
Rehabilitation Technologies: Biomechatronics Point of View
1 Rehabilitation Technologies: Biomechatronics Point of View Erhan Akdoğan and M. Hakan Demir Yıldız Technical University Turkey 1. Introduction Rehabilitation aims to bring back the patient’s physical, sensory, and mental capabilities that were lost due to injury, illness, and disease, and to support the patient to compensate for deficits that cannot be treated medically (http://www.ehendrick.org/healthy, June 2010). After the Spinal Cord Injury (SCI), stroke, muscle disorder, and surgical operation such as knee artroplasticy, patients need rehabilitation to recover their movement capability (mobilization) (Bradly et al., 2000; Inal, 2000; Metrailler et al., 2007; Okada et al., 2000; Reinkensmeyer, 2003 and http://www.manchesterneurophysio.co.uk, November 2010). The number of those who need rehabilitation is steadily increasing everyday. Parallel to this, equipment and techniques used in the field of rehabilitation are becoming more advanced and sophisticated. On the other hand, mechatronics, an interdisciplinary science, is a combination of machinery, electric-electronics and computer sciences plays an important role in rehabilitation technologies. In particular mechatronics systems provide important benefits for movements that are related to physical exercises in rehabilitation process. Biomechatronics is a sub-discipline of mechatronics. It is related to develop mechatronics systems which assist or restore to human body. A biomechatronic system has four units: Biosensors, Mechanical Sensors, Controller, and Actuator. Biosensors detect intentions of human using biological reactions coming from nervous or muscle system. The controller acts as a translator between biological and electronic systems, and also monitors the movements of the biomechatronic device. Mechanical sensors measure information about the biomechatronic device and relay to the biosensor or controller. -
Brushless DC Electric Motor
Please read: A personal appeal from Wikipedia author Dr. Sengai Podhuvan We now accept ₹ (INR) Brushless DC electric motor From Wikipedia, the free encyclopedia Jump to: navigation, search A microprocessor-controlled BLDC motor powering a micro remote-controlled airplane. This external rotor motor weighs 5 grams, consumes approximately 11 watts (15 millihorsepower) and produces thrust of more than twice the weight of the plane. Contents [hide] 1 Brushless versus Brushed motor 2 Controller implementations 3 Variations in construction 4 AC and DC power supplies 5 KM rating 6 Kv rating 7 Applications o 7.1 Transport o 7.2 Heating and ventilation o 7.3 Industrial Engineering . 7.3.1 Motion Control Systems . 7.3.2 Positioning and Actuation Systems o 7.4 Stepper motor o 7.5 Model engineering 8 See also 9 References 10 External links Brushless DC motors (BLDC motors, BL motors) also known as electronically commutated motors (ECMs, EC motors) are electric motors powered by direct-current (DC) electricity and having electronic commutation systems, rather than mechanical commutators and brushes. The current-to-torque and frequency-to-speed relationships of BLDC motors are linear. BLDC motors may be described as stepper motors, with fixed permanent magnets and possibly more poles on the rotor than the stator, or reluctance motors. The latter may be without permanent magnets, just poles that are induced on the rotor then pulled into alignment by timed stator windings. However, the term stepper motor tends to be used for motors that are designed specifically to be operated in a mode where they are frequently stopped with the rotor in a defined angular position; this page describes more general BLDC motor principles, though there is overlap.