Modeling of flexible components for asserting the stability of superconducting magnets

2007 ◽  
Author(s):  
Abhay Kumar ◽  
Subhajit Dutta ◽  
S. C. Bapna ◽  
S. Kotaiah ◽  
Alain Poncet
Keyword(s):  
Superconducting Magnets ◽  
The Stability ◽  
Flexible Components

Stability Prediction in Turning of Flexible Components

2010 ◽  
Vol 112 ◽  
pp. 149-157 ◽  
Author(s):  
Gorka Urbicain ◽  
David Olvera ◽  
Luis Norberto López de Lacalle ◽  
Francisco Javier Campa
Keyword(s):  
Machine Tool ◽  
Surface Quality ◽  
Classical Problem ◽  
Cutting Conditions ◽  
Stability Prediction ◽  
Nose Radius ◽  
The Stability ◽  
Tool Nose Radius ◽  
Flexible Components

Chatter is the most classical problem in machining. It is prone to occur in low rigidity structures generating poor surface quality and harmful vibrations which could damage any part of the machine-tool system. In finishing operations, the effect of the tool nose radius should be taken into account in order to obtain safe and reliable cutting conditions. The present paper uses a simple SDOF model to study the stability during finishing operations.

scholarly journals Experimental and Simulation Research of AC Ripple Losses in a High Temperature Superconductor Tape

2018 ◽  
Vol 2018 ◽  
pp. 1-5
Author(s):  
Hongwei Liu ◽  
Guosheng Song ◽  
Chuanhui Zhang ◽  
Jinwen Tan ◽  
Wengang Feng
Keyword(s):  
Superconducting Magnets ◽  
Ac Loss ◽  
Ac Losses ◽  
Strong Impact ◽  
Simulation Research ◽  
Current Transmission ◽  
Current Leads ◽  
The Stability ◽  
Superconductor Tape ◽  
Operation Cost

Current leads in superconducting magnets are widely adopted for heavy current transmission, and HTS DC cables have great advantages when used as current leads for such purposes. However, as an important parameter of HTS DC cables, AC loss has a strong impact on the stability and operation cost of current leads. In this paper, experiments were conducted to measure AC ripple losses of HTS tapes and HTS cables, and simulations of HTS tapes were carried out. The paper has reached conclusions on the relation between AC losses and power frequencies.

Influence of supercurrents on the stability of superconducting magnets

1998 ◽  
Vol 310 (1-4) ◽  
pp. 327-334 ◽  
Author(s):  
Ludovit Krempasky ◽  
Curt Schmidt
Keyword(s):  
Superconducting Magnets ◽  
The Stability

Utilization of large heat capacity substances for improving the stability of superconducting magnets

Cryogenics ◽  
2011 ◽  
Vol 51 (7) ◽  
pp. 359-365 ◽  
Author(s):  
V.E. Keilin ◽  
I.A. Kovalev ◽  
S.L. Kruglov ◽  
A.K. Shikov ◽  
D.I. Shutova ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Superconducting Magnets ◽  
Large Heat ◽  
The Stability

ChemInform Abstract: Utilization of Large Heat Capacity Substances for Improving the Stability of Superconducting Magnets

ChemInform ◽  
2013 ◽  
Vol 44 (2) ◽  
pp. no-no
Author(s):  
V. E. Keilin ◽  
I. A. Kovalev ◽  
S. L. Kruglov ◽  
A. K. Shikov ◽  
D. I. Shutova ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Superconducting Magnets ◽  
Large Heat ◽  
The Stability

Open discussion

1982 ◽  
Vol 99 ◽  
pp. 605-613
Author(s):  
P. S. Conti
Keyword(s):  
Buenos Aires ◽  
Large Mass ◽  
List Type ◽  
Common Phenomenon ◽  
Open Discussion ◽  
The Stability ◽  
Ring Nebulae

Conti: One of the main conclusions of the Wolf-Rayet symposium in Buenos Aires was that Wolf-Rayet stars are evolutionary products of massive objects. Some questions:–Do hot helium-rich stars, that are not Wolf-Rayet stars, exist?–What about the stability of helium rich stars of large mass? We know a helium rich star of ∼40 MO. Has the stability something to do with the wind?–Ring nebulae and bubbles : this seems to be a much more common phenomenon than we thought of some years age.–What is the origin of the subtypes? This is important to find a possible matching of scenarios to subtypes.

Symmetric Multistep Methods Revisited: II. Numerical Experiments

1999 ◽  
Vol 173 ◽  
pp. 309-314 ◽  
Author(s):  
T. Fukushima
Keyword(s):  
Multistep Methods ◽  
Computational Time ◽  
Integration Time ◽  
Implicit Methods ◽  
Symmetric Methods ◽  
Celestial Bodies ◽  
The Stability ◽  
Predictor Corrector ◽  
Symmetric Multistep Methods ◽  
Integration Errors

AbstractBy using the stability condition and general formulas developed by Fukushima (1998 = Paper I) we discovered that, just as in the case of the explicit symmetric multistep methods (Quinlan and Tremaine, 1990), when integrating orbital motions of celestial bodies, the implicit symmetric multistep methods used in the predictor-corrector manner lead to integration errors in position which grow linearly with the integration time if the stepsizes adopted are sufficiently small and if the number of corrections is sufficiently large, say two or three. We confirmed also that the symmetric methods (explicit or implicit) would produce the stepsize-dependent instabilities/resonances, which was discovered by A. Toomre in 1991 and confirmed by G.D. Quinlan for some high order explicit methods. Although the implicit methods require twice or more computational time for the same stepsize than the explicit symmetric ones do, they seem to be preferable since they reduce these undesirable features significantly.

Uniformity of Magnification from Different Electron Microscopes

1967 ◽  
Vol 25 ◽  
pp. 32-33
Author(s):  
Godfrey C. Hoskins ◽  
V. Williams ◽  
V. Allison
Keyword(s):  
Diffraction Grating ◽  
The Other ◽  
Carbon Replica ◽  
Electron Microscopes ◽  
The Stability

The method demonstrated is an adaptation of a proven procedure for accurately determining the magnification of light photomicrographs. Because of the stability of modern electrical lenses, the method is shown to be directly applicable for providing precise reproducibility of magnification in various models of electron microscopes.A readily recognizable area of a carbon replica of a crossed-line diffraction grating is used as a standard. The same area of the standard was photographed in Phillips EM 200, Hitachi HU-11B2, and RCA EMU 3F electron microscopes at taps representative of the range of magnification of each. Negatives from one microscope were selected as guides and printed at convenient magnifications; then negatives from each of the other microscopes were projected to register with these prints. By deferring measurement to the print rather than comparing negatives, correspondence of magnification of the specimen in the three microscopes could be brought to within 2%.

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