基于B样条的平流层飞艇外形优化设计

为改善飞艇气动性能,提高推进系统的效率,增加飞艇承受有效负载的能力并延长其运行时间,将飞艇艇体气动阻力和艇体表面积两个主要因素引入到平流层飞艇外形优化设计中,建立了复合目标函数,在飞艇体积不变的前提下,采用EXTREM数值优化算法,对平流层飞艇外形基于B样条曲线参数化方法在体积和长度不变的限制条件下,进行了双目标优化设计,优化后,外形的气动阻力减小了7.12%,同时飞艇艇体表面积也减少了1.76%。文章的研究结果实现了减阻和减重的双重目标,证明了该方法是合理可行的,可为平流层飞艇总体设计提供相关参考。

Shape Optimization Design Based on B-spline for Stratospheric Airship

In the paper,in order to improve aerodynamic characteristics of airship and efficiency of propulsion system, increase airship payload ability and prolong airship running time, the aerody- namic drag and the surface area of stratosphere are introduced into the optimized design of the air- ship contour, and a complex objective function is built. Without changing the airship volume, the numerical optimization algorithm EXTREM is used to carry out bi-objective optimization of the stratospheric airship contour based on the B-spline curve parametric approach. The aerodynamic drag of optimized airship shape is reduced 7.12 %, and the airship surface area is reduced 1.76% at the same time. The results show that the dual-purpose of reducing drag and weight is realized and the shape aerodynamic design method for stratosphere airship is reasonable and practicable, which can provide reference and guidance for the overall design of stratospheric airship.