摘要
水火弯板自动化的研究需要定量化地确定横向收缩量。本文采用实验和有限元分析相互结合的方法来研究线加热过程中的横向收缩量。首先,利用水火弯板实验的结果标定有限元分析中呈高斯分布的热源模型参数,而后利用数值模拟的方法探讨水火弯板成形因素对横向收缩量的影响。这些因素包括自然对流换热系数、有无水冷、热源速度、加热焰道长度、燃气流量和横向曲率半径。研究结果表明:自然对流换热系数和横向曲率半径对横向收缩的影响很小;跟踪水冷可以形成有效的收缩;不同燃气流量的热输入有不同的横向收缩变形。本文提出了综合考虑火焰速度、火焰有效功率、火焰作用半径和钢板厚度的热源体能量模型,该模型可以更好地反映这些热输入影响参数所引起的综合作用。
For automation of the line heating work,it needs to evaluate transverse shrinkage generated by line heating quantitatively. This paper examines the transverse shrinkage in line heating with the technique that line heating experiment together with numerical method using FEM analyses.First,parameters of Gaussian distribution heat flux in FEM simulation of line heating are determined by line heating experiment. Secondly numerical simulations of line heating discuss effects of line heating factors that are convective coefficient, water-cooling, torch velocity, heating length, combustion gas flow and curvature radius in the transverse direction.It is concluded that curvature radius in the transverse direction has least effect in transverse shrinkage and water cooling following the heating torch leads to efficient shrinkage.Heat input of different gas flow results in different transverse shrinkage.In this paper,the volume energy model of heat source is propeseed to consider the complicated effect of torch velocity, flame effective power, torch radius and plate thickness. The volume energy model is a better description of the compositive effect of heat input factor including torch velocity, flame effective power and torch radius.
出处
《船舶力学》
EI
北大核心
2006年第2期111-119,共9页
Journal of Ship Mechanics
关键词
水火弯板
横向收缩
有限元分析
热源模型
line heating
transverse shrinkage
FEM analyses
heat source model
作者简介
张雪彪（1974-），男，大连理工大学船舶工程系博士研究生。
