本文将基于弹性体变形思想的FFD(Free Form Deformation,自由变形)方法引入飞机气动外形优化设计中,为气动优化设计提供了一种快速、有效的参数化方法和自动网格生成方法.对FFD方法的原理进行分析,归纳了FFD方法的特点;将FFD方法应用于...本文将基于弹性体变形思想的FFD(Free Form Deformation,自由变形)方法引入飞机气动外形优化设计中,为气动优化设计提供了一种快速、有效的参数化方法和自动网格生成方法.对FFD方法的原理进行分析,归纳了FFD方法的特点;将FFD方法应用于几何外形参数化和空间网格自动生成中,建立了基于FFD方法和遗传算法的翼型优化设计系统以及基于FFD方法、遗传算法和Kriging代理模型的翼根整流包优化设计系统;分别对NACA0012翼型和DLRF4翼身组合体翼根整流包进行减阻优化设计,优化结果得到了显著的减阻成效,证明了FFD方法在气动优化设计中有很好的应用效果.展开更多
For century, the need of change in the system of power grid is being felt and being considered as the most important change that we need in the modern era electrical system but before moving towards a new change the t...For century, the need of change in the system of power grid is being felt and being considered as the most important change that we need in the modern era electrical system but before moving towards a new change the things in past should be kept in mind so that there are better chances of great and beneficial change. The purpose of this research is to investigate the changes need to be incorporated in a conventional system to make a system self-sufficient and automated in order to make Electrical Power system more reliable. This paper assesses the current one way power system that is needed to be changed and has tried to provide an overview of the changes that we need in the system. The paper has focused more on the smart grid system and has explained the importance of smart grid system in terms of efficiency, automation and decision making capability in case of faults occurred on primitive grids with the help of comparative studies. The paper also highlighted the results in form of comparison with conventional grids and threw some light on the vision, control and the application of the smart grid system that will provide a two way system to the electrical network of the country and will make the distribution and consumption of energy more efficient also which is going to increase the reliability and accuracy in the system.展开更多
文摘本文将基于弹性体变形思想的FFD(Free Form Deformation,自由变形)方法引入飞机气动外形优化设计中,为气动优化设计提供了一种快速、有效的参数化方法和自动网格生成方法.对FFD方法的原理进行分析,归纳了FFD方法的特点;将FFD方法应用于几何外形参数化和空间网格自动生成中,建立了基于FFD方法和遗传算法的翼型优化设计系统以及基于FFD方法、遗传算法和Kriging代理模型的翼根整流包优化设计系统;分别对NACA0012翼型和DLRF4翼身组合体翼根整流包进行减阻优化设计,优化结果得到了显著的减阻成效,证明了FFD方法在气动优化设计中有很好的应用效果.
文摘For century, the need of change in the system of power grid is being felt and being considered as the most important change that we need in the modern era electrical system but before moving towards a new change the things in past should be kept in mind so that there are better chances of great and beneficial change. The purpose of this research is to investigate the changes need to be incorporated in a conventional system to make a system self-sufficient and automated in order to make Electrical Power system more reliable. This paper assesses the current one way power system that is needed to be changed and has tried to provide an overview of the changes that we need in the system. The paper has focused more on the smart grid system and has explained the importance of smart grid system in terms of efficiency, automation and decision making capability in case of faults occurred on primitive grids with the help of comparative studies. The paper also highlighted the results in form of comparison with conventional grids and threw some light on the vision, control and the application of the smart grid system that will provide a two way system to the electrical network of the country and will make the distribution and consumption of energy more efficient also which is going to increase the reliability and accuracy in the system.
