And the main parameter model is also constructed using neural networks . neural networks is used to identify the aerodynamic characteristic of the missile . the effectiveness of neural identification is verified by simulation study 针对导弹这样复杂非线性的系统建立了bp网络自适应辨识模型，气动特性bp网络辨识模型，及主导变量的bp网络软测量模型。
The effect of the number of grid , liquid water content ( lwc ) , median volumetric diameter ( mvd ) and ice layer time step on ultimate ice shape is analyzed , the aerodynamic characteristics of the iced airfoil is analyzed simply , too 分析了网格数、空气液态水含量、水滴当量体积直径和冰层时间步长对模拟冰形的影响，此外还对结冰翼型的气动特性进行了简要的分析。
In order to research the aerodynamic characteristics of grid fins effected by width to length ratio , the grid fins of three hight to width ratios were adapted in wind tunnel experiments at subsonic , transonic and supersonic speeds 为研究它对栅格翼气动特性的影响规律，本研究采用风洞实验的方法对3种不同格宽翼弦比的栅格翼在亚、跨、超声速3个马赫数下进行了气动特性的研究。
This paper uses above - mentioned methods to design double - wing mav aerodynamic shapes with normal and robust optimization . results shows robust optimization shapes lost some aerodynamic performance but become more steady 本文采用上述基于代理模型的稳健优化方法对微型飞行器气动外形进行确定性和稳健优化设计,所得结果显示稳健优化结果虽然损失了一些气动性能,但其气动特性变得更加稳健。
2 to meet the need of aerodynamic configuration optimization design in supersonic state , different supersonic drag prediction methods have been compared and the supersonic performance calculation method suitable for optimization design system has been obtained 为适应超音速气动外形优化设计要求，对不同的超音速阻力计算方法进行了比较计算和分析，建立了与优化设计相适应的超音速气动特性计算方法。
The step of this method is : selecting variables and their rang , creating experiment points , establishing parameter models , calculating cfd models , choosing aerodynamic characteristics , establishing surrogate models and setting optimization models 这种方法的步骤是:确定设计变量及其取值范围、生成试验设计点、建立参数化几何模型、应用cfd软件进行数值计算、提取气动特性、构造代理模型和建立优化模型。
In order to measure respective aerodynamic parameters of deck and vechile when vehicle is above deck , a simple but performance - excellent device was developed , here called crossed slot system . the device can separate the wind loads on bridge and on vehicles from each other 采用研制的三分力分离装置? ?交叉滑槽系统( crossedslotsystem )对车?桥系统的气动特性进行了测试，得到了考虑车桥气动相互影响的三分力系数。
Firstly , the study about flight icing is reviewed at the beginning . the condition of icing accretion , the style of icing accretion , the parameters of icing accretion in flight , and the influence of icing accretion on the aerodynamic characteristics of an airplane are analyzed 首先,回顾了国内外在飞机结冰方面的研究情况,对飞机在飞行中的结冰条件、结冰类型、结冰参数以及结冰对气动特性的影响进行了分析讨论。
The dynamic meshing technique was adopted to realize the 3 - d transient numerical simulation of vehicle overtaking process in order to study the influence of relative velocity and absolute velocity on the aerodynamic characteristics of the overtaking and overtaken vehicles during the overtaking process 摘要为了研究超车过程中相对车速和绝对车速对汽车气动特性的影响，采用动网格技术实现了超车过程的三维瞬态数值模拟。
Based on the aerodynamic characteristics of space shuttle booster - like missile bodies at angle of attack from 0 to 180 , the flying characteristics of high maneuver at 90 angle of attack and velocity consuming at 180 angle of attack are analyzed 摘要以新一代无翼式气动布局导弹为背景，在大攻角气动特性理论基础上，分析了在导弹主动段、攻角在180范围内变化的导弹飞行特性，得出了90内大攻角最大转弯能力和180攻角附近最大降速效果的结论。
