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ASTNA517GRQ与EQ56材料焊接产生冷裂纹的处理方案 被引量:1
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作者 李勇 杨泽钰 +4 位作者 汤晓锋 潘秦 叶晓凯 顾振强 王莹 《焊接技术》 2021年第7期75-78,共4页
文中针对自升式钻井平台超高强钢齿条板ASTNA517GRQ与桩靴EQ56材料的焊接特点,阐述了该材料形成冷裂纹的主要原因,通过对母材中的化学成分、氢含量、接头应力、焊后热处理、操作因素、加热温度等方面的分析,确定了操作技术要求,制订了... 文中针对自升式钻井平台超高强钢齿条板ASTNA517GRQ与桩靴EQ56材料的焊接特点,阐述了该材料形成冷裂纹的主要原因,通过对母材中的化学成分、氢含量、接头应力、焊后热处理、操作因素、加热温度等方面的分析,确定了操作技术要求,制订了相应的修复工艺,修复后质量比较稳定,取得了较好的效果。 展开更多
关键词 astna517GRQ与EQ56材料 冷裂纹 处理方案
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Active set truncated-Newton algorithm for simultaneous optimization of distillation column 被引量:1
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作者 梁昔明 《Journal of Central South University of Technology》 2005年第1期93-96,共4页
An active set truncated-Newton algorithm (ASTNA) is proposed to solve the large-scale bound constrained sub-problems. The global convergence of the algorithm is obtained and two groups of numerical experiments are mad... An active set truncated-Newton algorithm (ASTNA) is proposed to solve the large-scale bound constrained sub-problems. The global convergence of the algorithm is obtained and two groups of numerical experiments are made for the various large-scale problems of varying size. The comparison results between ASTNA and the subspace limited memory quasi-Newton algorithm and between the modified augmented Lagrange multiplier methods combined with ASTNA and the modified barrier function method show the stability and effectiveness of ASTNA for simultaneous optimization of distillation column. 展开更多
关键词 simultaneous optimization of distillation column active set truncated-Newton algorithm modified augmented Lagrange multiplier methods numerical experiment
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