分布式计算机技术在飞机非标测控设备中的应用和实现

在研究、分析和总结分布式计算机技术与系统实现的基础上，以苏-27战斗机火控雷达天线部件性能测控系统研制过程为例，详细论述了分布式计算机测控系统的实现模式，介绍了一种先进合理的非标测控设备设计解决方案和快捷、低成本的系统实用集成方案。     

Direct integration methods in dynamic problems of structural mechanics

A method of direct integration with respect to time is proposed to solve dynamic problems of structural mechanics and comparison with the well-known methods is presented.     

浅谈高职院校图书馆工具书库的建设

高职院校图书馆的纸本工具书具有重要的应用价值,并拥有广泛、稳定的读者群,其地位和作用是网络信息所无法取代的。重视和加强图书馆工具书库的建设与管理,是高职院校建设与发展的重要环节。因此,工具书库应主动适应高职院校的专业发展的要求,不断加强设施建设和资源补充,及时加工、整理工具书的再版文献,努力向读者提供有效的服务措施;要充分利用学校的报刊、校园网、宣传橱窗和读书座谈会来加强图书宣传,引导和帮助读者加深对工具书的认识,只有这样才能充分发挥出工具书库应有的作用,最大限度地向读者提供优质服务,满足不同读者的需要。     

GPS/INS超紧组合载波跟踪环路最优带宽在线设计

在全球定位系统和惯性导航系统组成的超紧耦合系统中,卫星信号的跟踪性能直接取决于载波跟踪环路的带宽。为提高最优带宽的计算精度,在对惯导辅助下载波跟踪环路跟踪特性进行分析的基础上,详细推导了载波多普勒频率估计误差、多普勒频率变化率估计误差的计算方式,建立了惯导辅助下的环路跟踪误差模型;在实时估计跟踪载噪比的基础上,应用离散牛顿二阶梯度法迭代解算最优带宽,并进行实时调整。仿真结果表明,所设计最优带宽迭代解算方法的计算精度能够在11次迭代内达到99.6%,以此作为环路的带宽,能够在弱信号、辅助信息精度较低的情况下有效提高环路的跟踪精度。     

Assessment of between-floor structural and topological properties on cognitive map development in multilevel built environments

The present study investigated cognitive map development in multilevel built environments. Three experiments were conducted in complex virtual buildings to examine the effects of five between-floor structural factors that may impede the accuracy of humans’ ability to build multilevel cognitive maps. Results from Experiments 1 and 2 (of three experiments) revealed that difficulties in developing multilevel cognitive maps are not solely caused by the z-axis offset, as is suggested in the literature, but are due to the factorial combination of a between-floor overlap and a z-axis offset. Results from Experiment 2 showed that this process becomes substantially more difficult when the reference directions between different floors have an angular offset from each other. Finally, results from Experiment 3 demonstrated that confusing between-floor heading shifts in aligned buildings did not make it reliably harder to build multilevel cognitive maps. The implications of these findings are discussed in terms of theories of mental representations in multilayered three-dimensional spaces, as well as for architectural design.     

失效概率矩独立全局灵敏度分析的高效算法

失效概率矩独立全局灵敏度分析对指导可靠性优化至关重要，本文从乘法降维及Edgeworth级数展开的角度提出一种失效概率矩独立全局灵敏度指标分析的高效算法。所提算法通过Edgeworth级数展开将失效概率矩独立全局灵敏度指标的求解转化为输出无条件及条件前四阶整数矩的求解。对于输出的无条件及条件四阶矩的计算，基于乘法降维的思想，本文推导了重复利用计算输出的无条件矩的输入输出样本来计算条件矩以及外层关于输入变量一维积分的计算公式，使得仅需重复利用输出无条件前四阶矩求解产生的积分网格内的数据即可同时求得输出的前四阶条件矩以及外层关于输入变量的一维积分。所提算法大大提高了失效概率矩独立全局灵敏度的分析效率。航空发动机涡轮盘以及汽车前轴的分析结果验证了所提算法的高效性及准确性。     

Distributed intelligent self-organized mission planning of multi-UAV for dynamic targets cooperative search-attack

This article studies the cooperative search-attack mission problem with dynamic targets and threats, and presents a Distributed Intelligent Self-Organized Mission Planning (DISOMP) algorithm for multiple Unmanned Aerial Vehicles (multi-UAV). The DISOMP algorithm can be divided into four modules: a search module designed based on the distributed Ant Colony Optimization (ACO) algorithm, an attack module designed based on the Parallel Approach (PA) scheme, a threat avoidance module designed based on the Dubins Curve (DC) and a communication module designed for information exchange among the multi-UAV system and the dynamic environment. A series of simulations of multi-UAV searching and attacking the moving targets are carried out, in which the search-attack mission completeness, execution efficiency and system suitability of the DISOMP algorithm are analyzed. The simulation results exhibit that the DISOMP algorithm based on online distributed down-top strategy is characterized by good flexibility, scalability and adaptability, in the dynamic targets searching and attacking problem.     

高性能军用机环境控制系统研究发展趋势的探讨

讨论了未来高性能军用机环境控制系统发展可能采用的技术,例如：闭式空气循环技术;综合数字控制技术;蒸发循环技术;先进驱动的空气循环机和压气机技术;以及从属于综合机载机电系统的综合环境控制系统技术。     

口径天线绕射场的研究

介绍口径天线近场绕射计算的卷积积分法 ,该方法可用 FFT实现快速计算 ,故它是比传统的直接积分或球面波展开法更有效的一种计算模式。在此基础上 ,对圆形和矩形口径天线的近场绕射特性进行了研究。由计算结果可见 ,口径天线在观察面上的绕场分布与口径形状、口径尺寸 ( D/λ)和观察面至口径有关。还对减小口径边缘的近场绕射问题进行了分析     

Improvement of forebody/inlet integration for hypersonic vehicle

Results of a numerical (CFD) study of the influence of the forebody shape on local flow parameters at a bottom-mounted inlet entrance are presented. The free-stream Mach number is assumed to be 3.5–7.0. Some recommendations on forebody shape optimization are provided. Main characteristics of the air inlet are evaluated.