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Topic: Electrodynamic suspension


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In the News (Tue 19 Mar 19)

  
  Magnetic levitation - Wikipedia, the free encyclopedia
The primary ones used in maglev trains are servo-stabilized electromagnetic suspension (EMS), electrodynamic suspension (EDS), and Inductrack.
This principle is exploited by EDS (electrodynamic suspension) in some magnetic levitation trains.
Electromagnetic suspension (EMS) in maglev trains is a system whereby a powered electromagnet maintains a train at a constant distance from a track.
en.wikipedia.org /wiki/Electrodynamic_suspension   (1351 words)

  
 Encyclopedia :: encyclopedia : Magnetic levitation   (Site not responding. Last check: 2007-10-30)
Due to this (and flux pinning) the magnet is held at a fixed distance from the superconductor or vice versa.
This is the principle in place behind EDS (electrodynamic suspension) magnetic levitation trains.
If the position and trajectory of the object to be levitated can be measured, the field of nearby electromagnets (or even the position of permanent magnets) can be continuously adjusted via feedback control systems to keep the levitated object in the desired position.
www.hallencyclopedia.com /Magnetic_levitation   (742 words)

  
 Dr. Marc Thompson, PhD Thesis CHAPTER 1 --- INTRODUCTION
The repulsive system (electrodynamic suspension, or EDS) is levitated by reaction forces caused by induced circulating currents in a passive conductive guideway.
The electrodynamic superconducting magnetic suspension (EDS) is a repulsive suspension invented in the United States in the 1960’s and has been actively researched in the United States, Japan, and to a lesser extent Germany.
The use of HTSC coils in an active secondary suspension is a significant contribution to the state-of-the-art in Maglev suspensions.
members.aol.com /marctt/Research/chapter1.htm   (4506 words)

  
 WHAT IS MAGLEV?   (Site not responding. Last check: 2007-10-30)
Electromagnetic suspension (EMS) is an attractive force levitation system whereby electromagnets on the vehicle interact with and are attracted to ferromagnetic rails on the guideway.
Variations in payload weight, dynamic loads, and guideway irregularities are compensated for by changing the magnetic field in response to vehicle/guideway air gap measurements.
Electrodynamic suspension (EDS) employs magnets on the moving vehicle to induce currents in the guideway.
www.patentkorea.co.kr /science/future.htm   (280 words)

  
 The Tom Bearden Website
The extended electrodynamics provides an electrodynamically engineerable unified field theory that is capable of directly changing matter through action-at-a-distance, including time-reversing matter (either living or inert), through the manipulation of the internal longitudinal wave pairs with associated time-polarized EM waves.
It is known in electrodynamics that in a dielectric, such as the body, every part of the dielectric participates in each photon emission from the body surface [Reali, 55].
Suspensions of larger particles or regular masses can be utilized if the liquid medium is agitated to keep the particles/masses in suspension.
www.cheniere.org /patent%20application/claim.htm   (16713 words)

  
 MAGLEV   (Site not responding. Last check: 2007-10-30)
Dueto this (and flux pinning) the magnet is held at a fixed distance from thesuperconductor or vice versa.
There are three primary types of maglev technology: One that relies on superconducting magnets (electrodynamic suspension), one that relies on feedback controlled electromagnets (electromagneticsuspension), and a newer, potentially more economical system that uses permanent magnets (Inductrack).
Unimodal is a proposed personal rapid transit system using Inductrack suspension to achieve average commute speeds of160kph (100mph) in the city.
www.therfcc.org /maglev-110796.html   (1646 words)

  
 [No title]
The electrodynamic system, also known as the Linear express, was developed in Japan.
The electrodynamic system is based on three basic principles, Lenz's law (motional emf), moving current creates a magnetic field, and that like poles of a magnetic field repel while opposite poles attract.
Superconducting wires are used in a basically solenoid shape to create the electromagnets on the train with a linear synchronous motor that provides the alternating current.
www.unc.edu /~lindseyl/Japanese1.htm   (198 words)

  
 Magnetic Levitation Train - MSN Encarta
The first, called electromagnetic suspension (EMS), uses conventional electromagnets mounted at the ends of a pair of structures under the train.
The second design, called electrodynamic suspension (EDS), uses the opposing force between superconducting magnets on the vehicle and electrically conductive strips or coils in the guideway to levitate the train.
This approach is inherently stable, and it does not require continued monitoring and adjustment.
encarta.msn.com /encyclopedia_761579465/Magnetic_Levitation_Train.html   (909 words)

  
 Final Report on the National Maglev Initiative
The systems were described in terms of conceptual design detail, performance, cost, safety, and other measures in order to illustrate their merit for application to a next-generation 300 mph (134 m/s) maglev for U.S. deployment.
In order to take full advantage of a large air gap, a suspension with sophisticated characteristics, such as some combination of feedback, preview, and adaptive control, is needed.
Research to determine the optimum suspension force-control characteristic is ongoing.
www.bts.gov /NTL/DOCS/TNM.html   (18835 words)

  
 Magnetic levitation   (Site not responding. Last check: 2007-10-30)
If the position and trajectory of the object to be levitated can be measured, the field of nearby electromagnet s (or even the position of permanent magnet s) can be continuously adjusted via feedback control system s to keep the levitated object in the desired position.
There are three primary types of maglev technology: One that relies on superconducting magnet s (electrodynamic suspension), one that relies on feedback controlled electromagnets (electromagnetic suspension), and a newer, potentially more economical system that uses permanent magnets (Inductrack).
Other US urban maglev demonstration projects of note are the LEVX in Washington State, the Massachusetts-based Magplane, and a design similar to HSST by American Maglev Technology of Florida at Old Dominion University in Virginia.
www.serebella.com /encyclopedia/article-Magnetic_levitation.html   (1838 words)

  
 Perspective on Maglev Transit and Intro of the PRT Maglev
For the PRT maglev, vehicular suspension structures are located in front of and behind the passenger cabin.
For electrodynamic suspension, magnetic drag losses are proportional to the weight of the vehicle and are inversely proportional to travel velocity.
As high temperature superconductivity becomes reality, electric powered cars could be manufactured with magnetic suspension systems located within the four quarter-panels and, similar to HOV lanes, wheeled vehicles could literally drive onto and into a maglev transit corridor where automated maglev suspension would take over for much of the trip.
faculty.washington.edu /~jbs/itrans/suppes.htm   (5356 words)

  
 Superconductors!!!!!
German engineers are building an electromagnetic suspension (EMS) system, called Transrapid, in which the train's bottom is wrapped around a steel rail.
Japanese engineers are developing a competing version of maglev trains that use an electrodynamic suspension (EDS) system based on the repelling force of magnets.
The key difference between Japanese and German maglev trains is that the Japanese trains use super-cooled, superconducting electromagnets, whereas the German's EMS system uses standard electromagnets.
www.msu.edu /~otoolesh/mag.htm   (383 words)

  
 Superconductivity Technology Center at Los Alamos   (Site not responding. Last check: 2007-10-30)
The attractive electromagnetic suspension (EMS) uses electromagnets on the train body which are attracted to the iron rails.
The electrodynamic suspension (EDS) levitates the train by repulsive forces from the induced currents in the conductive guideways.
In both of these systems the levitating magnets are mounted to a number of "bogies" connected to the train body by a secondary suspension system of dampers and springs.
www.lanl.gov /orgs/mst/stc/train.shtml   (544 words)

  
 electrodynamics - Hutchinson encyclopedia article about electrodynamics
Branch of physics dealing with electric charges, electric currents, and associated forces.
Quantum electrodynamics (QED) studies the interaction between charged particles and their emission and absorption of electromagnetic radiation.
This subject combines quantum theory and relativity theory, making accurate predictions about subatomic processes involving charged particles such as electrons and protons.
encyclopedia.farlex.com /electrodynamics   (103 words)

  
 6.3.4.4
Electrodynamic Suspension -- It is crucial to avoid any thermally conductive physical pathways until the cycling Stirling engine (or other intentional energy transfer mechanism) calls for heat.
From the formulas given, a 100-nm particle with 10 surface charges (charge/mass ~ 1) can be stably confined to a 200-nm volume in a circular Lissajous pattern using a ~1 volt hyperbolic quadrupole AC field at a ~10 MHz resonance frequency plus a ~10 mV DC field to neutralize gravity.
Figure 6.4C, wherein the combustion assembly is affixed to a simple permanently-polarized dipole electret carrier which is itself electrodynamically levitated by same-sign control electrets positioned at either end.
www.nanomedicine.com /NMI/6.3.4.4.htm   (2228 words)

  
 A Hands-On Approach to Maglev for Gifted Students
For example, during electromagnetic suspension, magnets under the track draw on magnets attached to the body of the vehicle and propel the vehicle forward.
Electrodynamic suspension uses repulsion forces, rather than attraction forces.
The virtual elimination of friction through the use of electromagnetic and electrodynamic suspension allows the Maglev vehicles to travel at high rates of speed and use little energy during this process.
www.prufrock.com /client/client_pages/GCT_Readers/Science/Chapter_9/Maglev_for_Gifted_Students.cfm   (2274 words)

  
 Auxiliary propulsion for magnetically levitated vehicle (US5904101)
(a) dynamoelectric machines operative in response to alternating current excitation to generate fields of magnetic flux for electrodynamically levitating and guiding said vehicle along the first and second sections of the guideway and for electrodynamic propulsion of the vehicle along the first sections of the guideway; and
(b) auxiliary dynamoelectric machines operative in response to alternating current to generate fields of magnetic flux for electrodynamic propulsion of the vehicle along said second sections of the guideway.
Method and apparatus for use of alternating current in primary suspension magnets for electrodynamic guidance with superconducting fields
www.delphion.com /details?pn10=US05904101   (406 words)

  
 NASA/Marshall Huntsville Space Physics Colloquium
Using a unique laboratory technique known as electrodynamic suspension, a single charged particle is suspended in a modified quadrupole trap.
The trap or electrodynamic balance is composed of three electrodes.
An alternating voltage is applied to the center ring electrode and a DC voltage is applied to the top and bottom electrode.
science.nasa.gov /colloquia/99jul30_spcoll.htm   (313 words)

  
 V830 and V850 Electrodynamic Shakers
These air-cooled electrodynamic shakers are designed for vibration testing medium sized payloads such as automotive components and other types of electronics assemblies up to 600 kg.
The V830 and V850 electrodynamic shakers are used in combination with LDS SPA16K and SPA32K amplifiers provide vibration test systems for sine, random and transient testing.
LDS active suspension system eliminates the need for resilient mountings and improves reliability at low frequencies.
www.lds-group.com /docs/display_product.php?product_item_id=442   (351 words)

  
 REDUCE Bibliography
Stability of plane Poiseuille flow of a dilute suspension of slender fibres.
Quantum electrodynamics and renormalization theory in the infinite-momentum frame.
The study of motion for a gyroscope with gimbal suspension: Obtaining the highest approximations for a drift of magnus.
www.reduce-algebra.com /bibliography.htm   (7590 words)

  
 WPI Electrical and Computer Engineering - Marc T. Thompson
Thompson and R. Thornton, "Modeling of HTSC-Based Iron Core Flux-Canceling Electrodynamic Suspension for Maglev,"
Pr oceedings of the 4th International Symposium on Magnetic Suspension Technology, Gifu, Japan, NASA Conference Publication, 1997
Thompson, R. Thornton and A. Kondoleon, "Scale Model Flux-Canceling EDS Maglev Suspension --- Part I: Design and Modelling," IEEE Transactions on Magnetics, vol.
www.ece.wpi.edu /People/mtt.html   (409 words)

  
 Paden Home   (Site not responding. Last check: 2007-10-30)
Applied research is focused on robust design and control of MEMS oscillators, and the control of artificial hearts, and biomedical systems, is an emerging research activity in Professor Paden's group.
This project applies mathematical analysis to investigate the dynamic propoerties of electrodynamic suspension (EDS) mag-lev systems.
The ojectives are to develop, validate, and analyze dynamical models for EDS on perforated track; investigate fundamental limitations of the proposed technology, and facility cost-effective engineering designs.
www.engineering.ucsb.edu /~paden/research.htm   (262 words)

  
 Howstuffworks "How Maglev Trains Work"
In Germany, engineers have developed an electromagnetic suspension (EMS) system, called Transrapid.
Japanese engineers are developing a competing version of maglev trains that use an electrodynamic suspension (EDS) system, which is based on the repelling force of magnets.
The key difference between Japanese and German maglev trains is that the Japanese trains use super-cooled, superconducting electromagnets.
www.howstuffworks.com /maglev-train2.htm   (320 words)

  
 New Page 1
Because the magnets are below the rail, they are attracted upwards, which causes the vehicle to be pushed upwards and "levitate."
Unlike electromagnetic suspension, EDS operates through repulsive force.
In this instance, a vehicle has a electromagnet attached directly to the bottom of the vehicle, not below the rail.
www.mrfizzix.com /maglev/ems.htm   (120 words)

  
 Foster-Miller - Maglev - Nanotechnology Company specializing in System Design and Integration, Microelectronics, ...
Foster-Miller is a national leader in the field of magnetic levitation, or "maglev." ; We led one of the four teams that developed Maglev System Concept Definitions under the National Maglev Initiative in the 1990s.
More recently, we have applied electrodynamic suspension maglev technology to high-speed applications for the Air Force and NASA.
These projects involved the analysis of three-dimensional magnetic fields with motion induced eddy currents using both analytical and numerical methods, as well as the design and fabrication of prototype hardware.
www.foster-miller.com /t_eem_maglev.htm   (125 words)

  
 David Meeker, Ph.D.
Design of synchronous PM linear motor, electrodynamic "null-flux" suspension, and eddy current brake for NASA's Maglifter program.
This project involved the successful design and construction of a bearingless motor that accelerates 6 kg mass to a speed of 55 mph over the length of a 20 foot drive section.
Analysis of an electrodynamic suspension for a rocket sled, done as a subcontractor to General Atomics' Holloman High Speed Test Track Upgrade program.
femm.foster-miller.net /~dmeeker/cv.html   (1231 words)

  
 Referaty.sk - Maglev Train (Magnetic Levitation Train)
The first, called electromagnetic suspension (EMS), uses conventional electromagnets mounted at the ends of a pair of structures under the train; the structures wrap around and under each side of the guideway.
The second design, called electrodynamic suspension (EDS), uses the opposing force between magnets on the vehicle and electrically conductive strips or coils in the guideway to levitate the train.
This approach is inherently stable, and does not require continued monitoring and adjustment; there is also a relatively large clearance between the guideway and the vehicle, typically 100 to 150 mm (4 to 6 in).
www.referaty.sk /prirodne_vedy/fyzika_a_astronomia/2875   (461 words)

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