NASA Technical Reports Server (NTRS) 19750023446: Rigid format alter packets for the analysis of electromagnetic field problemsReport as inadecuate




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The computer program NASTRAN is used to solve electromagnetic field problems. The diffusion equation and the boundary conditions valid for problems of these kinds together with a replacing potential energy function are given. The extent to which an analogy with finite element displacement and temperature approaches holds is indicated. The outputtin

Author: NASA Technical Reports Server (NTRS)

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RIGID FORMAT ALTER PACKETS OF ELECTROMAGNETIC E. Spreeuw, FOR FIELD Reactor THE ANALYSIS PROBLEMS Centrum Nederland and R.J.B. Reefman, Hazemeyer B.V. SUMMARY NASTRAN has been used to solve two types of electromagnetic field problems. The diffusion equation and the boundary conditions valid for problems of these kinds together with a replacing potential energy function have been given. The extent to which an analogy with finite element displacement and temperature approaches holds is indicated. The outputting of complex quantities is made possible after adjustment of standard rigid format i input data blocks to module SDR2. The applications made involve the study of the proximity effect in a system of three parallel conductors and the analysis of the magnetic field in the vicinity of the points of contact in circuit breakers. INTRODUCTION Obviously the knowledge of electromagnetic field distributions is of prime interest in Electric Power Engineering. Transient magnetic fields present in conducting materials cause the introduction of eddy currents in such materials. Energy losses leading to temperature increases result from these currents. The most familiar application of magnetic fields is in transformers where they determine the modification of current and voltage levels. They have also proven to determine the design of advanced types of power generators such as fusion reactors and MHD generators. These and many other reasons explain why the analysis of electromagnetic problems is as important as it is.
After finite difference techniques were used for these problems originally we now observe more and more interest in finite element methods. Among of Chari and Silvester (Ref.]3]) and Donea et the applications of finite element techniques the works (Ref.[l[), Chari (Ref.[2]), Silvester and Rafinejad al (Ref.[4]) have to be mentioned. 557 Rather than writing a stand-alone finite element code for the exclusive study of electromagne...





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