Analyzing the multilevel structure of the European airport network

The multilayered structure of the European airport network (EAN), composed of con-nections and flights between European cities, is analyzed through the k-core decomposition of the connections network. This decomposition allows to identify the core, bridge and periphery lay-ers of the EAN. The core layer includes the best-connected cities, which include important business air traffic destinations. The periphery layer includes cities with lesser connections, which serve low populated areas where air travel is an economic alternative. The remaining cities form the bridge of the EAN, including important leisure travel origins and destinations. The multilayered structure of the EAN affects network robustness, as the EAN is more robust to isolation of nodes of the core, than to the isolation of a combination of core and bridge nodes.     

多段翼型局部主动变形流动控制的非定常数值模拟

对30P30N三段翼型失速攻角附近的分离流动进行了数值模拟研究。为了抑制大攻角时背风区的流动分离,在主翼段上表面引入了行波壁变形模型和抛物型局部主动振动模型,利用作者以往发展的动态混合网格技术和相应的非定常计算方法,对变形过程中的非定常分离流动进行了数值模拟,分析了各种变形参数对流动分离的影响。计算结果表明,在适当的条件下,局部主动变形能够抑制翼型背风区的分离,由此可以起到增升减阻的作用,改善翼型的气动性能。     

非平稳大气紊流对弹性飞行器的影响

提出了采用复模态分析方法研究非平稳大气紊流对弹性飞行器的影响，首先给出了非平稳随机大气紊流模型，然后提出了弹性飞行器对非平稳随机大气紊流激励的复模态分析方法，该方法把复杂的随机动力响应计算问题转化为复代数运算问题，为研究飞行器对随机大气紊流的响应开辟了新的途径，最后以某型－空导弹为例，计算其对非平稳随机大气紊流的响应，从而说明非平稳随机大气紊流对弹性飞行器的影响。     

中频感应加热模具温度测控

就采用中频感应加热技术，预热各种工业模具的过程，对模具温度测试和加热工艺智能控制等方面进行了有关技术探索和论述，讨论了分析了该测控技术的主要特点和需要注意的问题。     

Initial design of laboratories for sustainable habitation

An effective and self-sustainable artificial habitat design is essential for human spaceflight and expansion of mankind into orbit or towards other celestial bodies. There are two approaches that need to be implemented in future sustainable habitats: the use of re-cycling technologies in order to gain experience in closed-loop processes and the primary production of resource materials using In Situ Resource Utilisation (ISRU) principles. Various products will be provided and, where applicable, recycled in such a system taking into account basic human factors requirements such as crew work load capacity, safety and well-being, namely:     

综合智能产品模型研究

现在复杂产品的研发需要一个协同的支撑平台,将人员、工具和过程集成起来。对产品以及相关数据的建模是实现协同支撑平台的关键,在分析国内外相关研究的基础上提出了综合智能产品模型(CSPM)的概念。在CSPM基础上,依据J2EE规范建立了综合智能产品数据环境(CSPDE)。     

Phase transitions in a dusty plasma with two distinct particle sizes

In semiconductor manufacturing, contamination due to particulates significantly decreases the yield and quality of device fabrication, therefore increasing the cost of production. Dust particle clouds can be found in almost all plasma processing environments including both plasma etching devices and in plasma deposition processes. Dust particles suspended within such plasmas will acquire an electric charge from collisions with electrons and ions in the plasma. If the ratio of inter-particle potential energy to the average kinetic energy is sufficient, the particles will form either a “liquid” structure with short-range ordering or a crystalline structure with long-range ordering. Many experiments have been conducted over the past decade on such colloidal plasmas to discover the character of the systems formed, but more work is needed to fully understand these structures. The preponderance of previous experiments used monodisperse spheres to form complex plasma systems. However, most plasma processing environments contain more arbitrary distributions of particle size. In order to examine in more detail the effects of a size distribution, experiments were carried out in a GEC rf reference cell modified for use as a dusty plasma system. Using two monodisperse particle sizes, experiments were conducted to determine the manner in which phase transitions and other thermodynamic properties depended upon the overall dust grain size distribution. Plasma crystals were formed from different mixtures of 8.89 and 6.50 μm monodisperse particles in argon plasma. With the use of various optical techniques, the pair correlation function was determined at different pressures and powers and then compared to measurements obtained for monodisperse spheres.     

A 3D hybrid grid generation technique and a multigrid/parallel algorithm based on anisotropic agglomeration approach

A hybrid grid generation technique and a multigrid/parallel algorithm are presented in this paper for turbulence flow simulations over three-dimensional (3D) complex geometries. The hybrid grid generation technique is based on an agglomeration method of anisotropic tetrahedrons. Firstly, the complex computational domain is covered by pure tetrahedral grids, in which anisotropic tetrahedrons are adopted to discrete the boundary layer and isotropic tetrahedrons in the outer field. Then, the anisotropic tetrahedrons in the boundary layer are agglomerated to generate prismatic grids. The agglomeration method can improve the grid quality in boundary layer and reduce the grid quantity to enhance the numerical accuracy and efficiency. In order to accelerate the convergence history, a multigrid/parallel algorithm is developed also based on anisotropic agglomeration approach. The numerical results demonstrate the excellent accelerating capability of this multigrid method.     

基于高度控制的拖靶定高飞行分析

超低空飞行的航空拖靶需要高精度的高度控制,而作为试验和训练的消耗性装备,其低成本设计要求使得航空拖靶不能采用常规飞行器的高度控制方法。针对以拖曳力为飞行动力的航空拖靶,研究其基于非姿态控制的定高飞行的运动特性。定高飞行航空拖靶采用高稳定性的气动布局,并基于准直接力控制的升降舵面进行高度调整操纵。通过建立拖靶的纵向运动数学模型,设计非姿态控制定高飞行控制方法,详细分析拖靶气动特性,并进行定高飞行控制的仿真计算。计算结果给出拖靶的高度控制能力及飞行状态,结果表明拖靶具有一定的高度调整能力,可以实现定高飞行。     

区域安全性分析在飞机总装过程中的应用探索

区域安全性分析(ZSA)是指为降低飞机机载系统在整机装配、维护等物理性集成时引起的飞机系统、飞机整机工作过程中的功能性风险,而在传统飞机物理样机阶段提前开展的结构与系统、系统与系统间协调性、技术符合性的分析检查工作.随着数字化设计模式的引入,部分区域安全性分析也尝试在设计阶段基于设计数字样机开展.在民用飞机设计领域,国...