Though the preferred welding process to weld aluminium alloy is frequently constant current gas tungsten arc welding (CCGTAW),it resulted in grain coarsening at the fusion zone and heat affected zone(HAZ).Hence,pulsed...Though the preferred welding process to weld aluminium alloy is frequently constant current gas tungsten arc welding (CCGTAW),it resulted in grain coarsening at the fusion zone and heat affected zone(HAZ).Hence,pulsed current gas tungsten arc welding(PCGTAW) was performed,to yield finer fusion zone grains,which leads to higher strength of AA6061 (Al-Mg-Si) aluminium alloy joints.In order to determine the most influential control factors which will yield minimum fusion zone grain size and maximum tensile strength of the joints,the traditional Hooke and Jeeves pattern search method was used.The experiments were carried out based on central composite design with 31 runs and an algorithm was developed to optimize the fusion zone grain size and the tensile strength of pulsed current gas tungsten arc welded AA6061 aluminium alloy joints.The results indicate that the peak current (Ip) and base current (IB) are the most significant parameters,to decide the fusion zone grain size and the tensile strength of the AA6061 aluminum alloy joints.展开更多
提出了一种混合演化算法求解多目标优化问题.演化算法是解决多目标优化问题的有效方法,在全局优化问题中具有很好的鲁棒性,但其局部搜索性能有待改善.Hooke and Jeeves方法是一经典的局部搜索算法,将其与演化算法结合求解多目标优化问题...提出了一种混合演化算法求解多目标优化问题.演化算法是解决多目标优化问题的有效方法,在全局优化问题中具有很好的鲁棒性,但其局部搜索性能有待改善.Hooke and Jeeves方法是一经典的局部搜索算法,将其与演化算法结合求解多目标优化问题,提高了解的收敛质量,因而从整体上提高了算法的性能,并且测试结果也说明了该算法的可行性.展开更多
基金Naval Research Board (NRB),Ministry of Defence,New Delhi for the financial support to carry out this investigation through sponsored project No.DNRD/05/4003/NRB/67.
文摘Though the preferred welding process to weld aluminium alloy is frequently constant current gas tungsten arc welding (CCGTAW),it resulted in grain coarsening at the fusion zone and heat affected zone(HAZ).Hence,pulsed current gas tungsten arc welding(PCGTAW) was performed,to yield finer fusion zone grains,which leads to higher strength of AA6061 (Al-Mg-Si) aluminium alloy joints.In order to determine the most influential control factors which will yield minimum fusion zone grain size and maximum tensile strength of the joints,the traditional Hooke and Jeeves pattern search method was used.The experiments were carried out based on central composite design with 31 runs and an algorithm was developed to optimize the fusion zone grain size and the tensile strength of pulsed current gas tungsten arc welded AA6061 aluminium alloy joints.The results indicate that the peak current (Ip) and base current (IB) are the most significant parameters,to decide the fusion zone grain size and the tensile strength of the AA6061 aluminum alloy joints.
文摘提出了一种混合演化算法求解多目标优化问题.演化算法是解决多目标优化问题的有效方法,在全局优化问题中具有很好的鲁棒性,但其局部搜索性能有待改善.Hooke and Jeeves方法是一经典的局部搜索算法,将其与演化算法结合求解多目标优化问题,提高了解的收敛质量,因而从整体上提高了算法的性能,并且测试结果也说明了该算法的可行性.
