FAST SOLUTION OF TURBULENT SEPARATION BY STRAWN''''S METHOD

ＦＡＳＴＳＯＬＵＴＩＯＮＯＦＴＵＲＢＵＬＥＮＴＳＥＰＡＲＡＴＩＯＮＢＹＳＴＲＡＷ＇ＳＭＥＴＨＯＤＹｉｎＪｕｎｆｅｉ（ＤｅｐａｒｔｍｅｎｔｏｆＰｏｗｅｒＥｎｇｉｎｅｅｒｉｎｇ，ＮＵＡＡ２９ＹｕｄａｏＳｔｒｅｅｔ，Ｎａｎｊｉｎｇ２１００１６，Ｐ．Ｒ．Ｃｈ...     

BUCKLING ANALYSIS OF POLAR ORTHOTROPIC ANNULAR PLATES UNDER UNIFORM PRESSURES

ＢＵＣＫＬＩＮＧＡＮＡＬＹＳＩＳＯＦＰＯＬＡＲＯＲＴＨＯＴＲＯＰＩＣＡＮＮＵＬＡＲＰＬＡＴＥＳＵＮＤＥＲＵＮＩＦＯＲＭＰＲＥＳＳＵＲＥＳＹｏｕＲｅｎｃｈａｎ；ＷａｎｇＹｏｎｇｌｉａｎｇ；ＷａｎｇＸｉｎｗｅｉ（ＤｅｐａｒｔｍｅｎｔｏｆＡｉｒｃｒａｆｔＥ...     

DATA MODEL FOR MULTIMEDIA DATABASE SYSTEM NHMDB BASED ON NF~2 DATA MODEL

ＤＡＴＡＭＯＤＥＬＦＯＲＭＵＬＴＩＭＥＤＩＡＤＡＴＡＢＡＳＥＳＹＳＴＥＭＮＨＭＤＢＢＡＳＥＤＯＮＮＦ~２ＤＡＴＡＭＯＤＥＬ￥ＧｕｏＨｏｎｇｙｉｎｇ；ＬｉｎＪｕｎｈａｉ；ＴｉａｎＣａｎｇｈａｉ（ＤｅｐａｒｔｍｅｎｔｏｆＣｏｍｐｒｔｅｒＳｃｉｅｎｃｅａｎ?..     

GHOST FLUID METHOD FOR RICHTMYER-MESHKOV INSTABILITY SIMULATION

INTRODUCTIONThe energy of the Richtmyer- Meshkov in-stability is excited by the interaction between ashock wave and a contact interface across thatfluids are different.Itis very important thatcap-ture the interface in multi- material flows exact-ly.Here we will apply the ghost fluid method tosimulate two dimensional Richtmyer- Meshkovinstability.The mathematical equation used to simulatethe Ritchmyer- Meshkov instability is the com-pressible Euler equation for two ideal gases.ρρuρvE…     

CSM玻璃钢层间剪切断裂

 本文对CSM-GRP层间剪切断裂用实验与分析方法进行了研究。用英国标准BS4994规定的双槽试件拉剪法测量了层间剪切强度（ILSS）。用有限元法计算了应力分布、损伤扩展和复合型应力强度因子。并讨论了BS4994规定的这一试验方法的可靠性。     

Carotid artery pulsatility during parabolic flights

In cardio-vascular hemodynamic, the arterial pulsatility, represented by the arterial pulse pressure (PP= systolic blood pressure-diastolic blood pressure), is different from one site to another, in opposite with the mean blood pressure almost identical in the whole body in supine position (or in microgravity). This is due to the arterial tree geometry and regional differences in the distensibility properties of the arterial wall. As the level of blood pressure opposed to the cardiac left ventricle work is the central pressure, on one hand and as the arterial pulsatility at the site of arterial baro-receptors (located on aortic arch and carotid arteries' bifurcation) regulates the sympathetic and vagal control of heart and peripheral resistances on the other hand, to determine the evolution of this central pulse pressure is of major importance in the knowledge of cardio-vascular hemodynamic during hyper or hypogravity as observed during parabolic flights. The aim of this study was to evaluate noninvasively the carotid artery pulsatility and mechanic properties during parabolic flights.     

供测量高阻率材料电压、电流和电阻用的前置放大器

本文介绍一种供测量高阻率材料直流电压、电流和电阻用的前置放大器,其测量范围分别为:电压:30μv～10v;电流:10~(-2)～10~(-13)A;电阻:10~3～10~(13)Ω。若在反馈回路中接入适当的电容器还可测量电荷。本前置放大器采用市场上供应的运算放大器制成,其体积较小,并可与市场上大量供应的电压表或记录器联合使用,适用于无定形的(非晶体的)半导体薄膜电气性能的就地测量。     

一种简单可靠的昆虫扑翼运动图像序列自动分析方法

目前高速摄影相机和多相机系统广泛地用于记录昆虫奇妙的飞行运动,然而分析这些运动图像序列的方法却不能让人满意.提出并测试了一种简单可靠的昆虫飞行图像的自动分析方法.该方法充分地利用了图像序列中相邻两帧间的差别,可自动提取出昆虫的特征点(翼尖点,翼根点,头部端点,腹部端点)和轮廓线(翼前缘轮廓,翼后缘轮廓).采用MATLAB实现并使用虚拟昆虫和真实昆虫运动图像序列测试了该方法.测试结果表明,该方法简单可靠,无需人工干预,不针对特定昆虫,运算量也较小,且能够提供较好的识别结果,甚至在处理昆虫的身体和翅膀部分重叠或者昆虫的翅膀图像呈现明显的透明的图像序列时候结果依然不错.该方法给昆虫图像的形态学特征自动识别难题提供了一个切实可行的解决方法,节省了昆虫扑翼运动图像的分析时间.     

三维物体绕流数值模拟中薄层模型的应用

介绍用于近似计算绕三维尖体无粘流激波薄层的二层模型。本法以数值确定激波的位置,在计算不同结构形状物体的空气动力特性时能确定气体动力载荷的近似值。采用这种方法实际上排除了超高速理论中其他已知方法对尖体几何形状所加的约束。与通常的空气动力特性曲线相结合,此法可获得在设计和非设计飞行状态下飞行器整个系统的近似绕流流场,且可优化其空气动力结构。     

基于基因算法与博弈论的气动高升力优化

A multi-objective evolutionary optimization method (combining genetic algorithms(GAs)and game theory(GT))is presented for high lift multi-airfoil systems in aerospace engineering.Due to large dimension global op-timization problems and the increasing importance of low cost distributed parallel environments,it is a natural idea to replace a globar optimization by decentralized local sub-optimizations using GT which introduces the notion of games associated to an optimization problem.The GT/GAs combined optimization method is used for recon-struction and optimization problems by high lift multi-air-foil desing.Numerical results are favorably compared with single global GAs.The method shows teh promising robustness and efficient parallel properties of coupled GAs with different game scenarios for future advanced multi-disciplinary aerospace techmologies.