Documents in the NTIS Technical Reports collection are the results of federally funded research. They are directly submitted to or collected by NTIS from Federal agencies for permanent accessibility to industry, academia and the public.  Before purchasing from NTIS, you may want to check for free access from (1) the issuing organization's website; (2) the U.S. Government Printing Office's Federal Digital System website http://www.gpo.gov/fdsys; (3) the federal government Internet portal USA.gov; or (4) a web search conducted using a commercial search engine such as http://www.google.com.
Accession Number ADA585012
Title Inductance Scaling of a Helicoil Using ALEGRA.
Publication Date May 2013
Media Count 50p
Personal Author R. Doney
Abstract The inductance scaling of several helicoil configurations are investigated using the March 2011 release of the Sandia magnetohydrodynamics (MHD) code, ALEGRA. A great majority of the effort is spent ensuring proper convergence of relevant variables for an accurate solution, such as mesh size, resolution, grid biasing, and solver tolerance. For these helicoil geometries, steady-state magnetic diffusion time requires several tens of milliseconds, up to two orders of magnitude greater than that required for coaxial conductors. Inductances are shown to scale quadratically with the number of conductor turns. At moderate to large N, results are in agreement with data provided by Bartkowski and Berning as well inductance calculated for a simple solenoid a function of the number of turns squared. Surprisingly, the gap size between conducting turns had a minor impact on the results.
Keywords Alegra
Convergence
Helicoil
Inductance
Magnetohydrodynamics
Tolerance

 
Source Agency Non Paid ADAS
NTIS Subject Category 46 - Physics
72B - Algebra, Analysis, Geometry, & Mathematical Logic
Corporate Author Army Research Lab., Aberdeen Proving Ground, MD. Weapons and Materials Research Directorate.
Document Type Technical report
Title Note Final rept. Jan 2011-Jan 2012.
NTIS Issue Number 1403
Contract Number N/A

Science and Technology Highlights

See a sampling of the latest scientific, technical and engineering information from NTIS in the NTIS Technical Reports Newsletter

Acrobat Reader Mobile    Acrobat Reader