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《Journal of Astronautics》 2009-01
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Analysis of Surface Temperature Distribution on Exoatmospheric Ballistic Target by FEM

ZHANG Jun(Artillery Academy,Hefei 230037,China)  
It is an important prerequisite to obtain surface temperature field on a target in the research on infrared characteristics.In this paper,a finite element(FE) model was developed to determine the surface temperature field of an exoatmospheric ballistic target.Radiation boundary condition was taken into account in the two-dimensional transient heat transfer FE model,which was built in the cylindrical coordinate system according to the axisymmetric distribution of the temperature field in the target.This paper strictly analyzed the radiation heat loss of nonisothermal finite element,and derived the expression of the radiation heat loss off a three-node axisymmetric triangular element.In order to use the Galerkin method to solve the time differential equations set,the radiation heat loss was treated as a heat load term dependent on time.Using the Newton-Raphson method,the nonlinear equations set was solved iteratively.A simple numerical experiment demonstrates the effectiveness of the present method.In the end,the surface temperature fields of the exoatmospheric ballistic target was analyzed by the triangular element.
【Fund】: 中国博士后科学基金(特别资助200801493 一等资助20080430223)
【CateGory Index】: V412
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