| || Inverse Estimation of Time-varied Heat Flux and Temperature on 2-D Gun Barrel using Input Estimation Method with Finite-element Scheme
Author : Chen, Tsung-Chien;Liu, Chiun-Chien
Source : Defence Science Journal ; Vol:58(1) ; 2008 ; pp 57-76
Subject : 623.4 Armaments and Ballistics;620.261 Explosives
Keywords : Heat flux;Input-estimation method;Finite element scheme;Inverse heat conduction;Inverse estimation
Abstract : When a gun fires, a large amount of heat flux is triggered by the propellant gas acting on the gun barrel inner wall, leading to the rise of temperature, which will cause serious destruction. In this paper, an inverse method based on the input-estimation method including the finite inverse heat conduction problem (IHCP) element scheme to inverse estimate the unknown heat flux on the 2-D gun barrel has been presented. The use of the online accuracy to inversely estimate the unknown heat flux on the chamber has been made using 7.62 mm gun barrel outer wall temperature measurement data. Using simulation uniform and non-uniform heat flux q(z,t) cases involves a gun barrel inner wall that varies with time t and the axial z-location with convection situation in the outer surface. Computational results show that the proposed method exhibits a good estimation performance and highly facilitates practical implementation.