Title :
Thermal Computation in Railgun by Hybrid Time Domain Technique 3-D-FEM-IEM
Author :
Bayati, M. Sajjad ; Keshtkar, Asghar ; Keshtkar, Ahmad
Author_Institution :
Fac. of Comput. & Electr. Eng., Univ. of Tabriz, Tabriz, Iran
Abstract :
Thermal energy in railgun is unwanted and generated by ohmic losses that are dependent to the current implied, rail dimensions, electrical conductivity (σ), and specific heat (Cp)-σ and Cp are functions of temperature. Using achievement formula by intelligent estimation method, the current density and ohmic losses on the cross section of the rail are computed. Ohmic losses are the source heat and utilized heat equation that are used to compute thermal distribution and temperature that are compared with other results in some papers. This paper chose , h = 30 mm , w = 10 mm, and copper for the rail material and a method to compute the thermal distribution on the surface of the rail and side rail edges. Effects of rail dimensions on the temperature in time domain are calculated and shown in the figures. Rail materials are investigated with copper and aluminum in which the average temperature of both materials on the rail surface is calculated and compared.
Keywords :
aluminium; copper; finite element analysis; railguns; time-domain analysis; 3D-FEM-IEM; Al; Cu; aluminum; copper; electrical conductivity; heat equation; hybrid time domain technique; intelligent estimation method; ohmic losses; rail dimensions; railgun; specific heat; thermal computation; thermal distribution; Electromagnetics; Equations; Materials; Mathematical model; Plasma temperature; Railguns; Rails; Intelligent estimation method with time variations (IEM-TD); maximum temperature; ohmic loss; railgun; thermal distribution;
Journal_Title :
Plasma Science, IEEE Transactions on
DOI :
10.1109/TPS.2010.2070847