武装直升机对地攻击路径规划遗传算法适配函数设计

简要分析了武装直升机对地攻击路径规划问题,基于遗传算法构建了武装直升机对地攻击路径规划适配函数,详细论述了适配函数中各主要威胁因素,并对路径可行性进行了分析,提出了路径可行性调整方案,针对路径撞山情况下地形威胁不合理问题,提出了解决方案.     

武汉服装业的竞争优势培育——基于价值链重构的研究

如何完善武汉服装产业链，优化整合服装品牌是振兴武汉服装产业的当务之急。培育武汉服装产业竞争力，需要利用综合配套改革试点区政策所创造的良好外部环境，以并购重组为抓手，制定系统化方案综合推进。打造专业化大型服装集团，促成产业链上、下游的有机衔接，培育扶持服装龙头企业，积极推动“五个中心”工程的实施是培育武汉服装产业竞争优势的关键所在。     

AMS-02航天探测器热控制系统静力分析与实验研究

基于阿尔法磁谱仪(AMS-02)发射、着陆和在轨运行三种工况,用有限元方法对AMS-02热控制系统进行了静力学分析.考虑了发射和着陆极限工况下运载工具与AMS-02的载荷耦合,AMS-02热控制系统的设计载荷系数用沿AMS-02坐标系三个坐标轴方向的重力加速度和角加速度等效表示.计算得到了AMS-02热控制系统各组件的位移和应力.数值分析结果与实际测试结果进行了比对,吻合较好,验证了该静力分析方法的有效性,为最终优化设计提供了依据.     

喉衬材料抗热震性能缩比考核试验方法

发动机研制中需对喉衬材料抗热震性能进行考核,发展了一种用小型固体发动机模拟全尺寸发动机热载荷对喉衬材料抗热震性能进行考核的缩比试验方法.通过保证推进剂、燃烧室压强、点火升压速率和喉衬型面等参数与全尺寸发动机接近,来保证热载荷的相似,同时适当兼顾喉衬应力的状态.采用该方法较好地再现了某型发动机出现的喉衬组件断裂飞出的故障...     

组合式空调机组表冷器设计浅析

阐述了组合式空调机组表冷器的主要设计内容,分析了机组运行中表冷器的常见问题,并针对这些问题提出了设计时采用的解决方法。     

水剂清洗在大批量生产中的应用

介绍可替代汽油、煤油清洗金属零组件的水剂清洗剂在大批量生产中的应用。     

On the origin of satellite swarms

For a species to develop in nature basically two things are needed: an enabling technology and a “niche”. In spacecraft design the story is the same. Both a suitable technology and a niche application need to be there before a new generation of spacecraft can be developed. In the last century two technologies have emerged which had and still have a huge impact on the development of technical systems: Micro-Electronics (ME) and Micro-Systems Technology (MST). Many different terrestrial systems have changed dramatically since the introduction of ME and MST and many new systems have emerged. In the same period many nano-satellites have been built and launched and shown that they can perform in space. Still it is not clear what the specific role of these small satellites will be. Where will they go? What will they do? In this paper the authors will try to answer these questions and will refer to the OLFAR space born radio telescope as one of the niche applications for a nano-satellite swarm.     

Design and Experiments of Model-free Compound Controller of Flight Simulator

A model-free compound controller design method is proposed to achieve the wide frequency bandwidth requirement of flight simulators. The method based on quantitative feedback theory, acquires system uncertainty under different working conditions through closed-loop identification with power spectrum estimation. Then in controller designing, it makes a tradeoff between the strict requirements for magnitude-frequency characteristics and those for phase-frequency characteristics of flight simulators, by converting the indices of magnitude-frequency characteristics of flight simulators into quantitative feedback theory-based tracking specification bounds and using feedforward controller to attain the required phase-frequency characteristics. Simulation and experimental results indicate that, when used to design inner frame controller of flight simulator, the proposed method can fulfill the requirements for wide frequency bandwidth indices. Compared with other controller design methods, it has the property of model-free and transparency.     

Multiple moving target feature extraction for airborne HRR radar

This study considers the clutter suppression and feature extraction of multiple moving targets for airborne high range resolution (HRR) phased array radar. To avoid the range migration problems that occur in the HRR radar data, we divide each HRR profile into nonoverlapping low range resolution segments. No information is lost due to the division and hence no loss of resolution occurs. We show how to use a vector auto-regressive filtering technique to suppress the clutter. Then a relaxation-based parameter estimation algorithm is presented for multiple moving target feature extraction. Numerical results are given to demonstrate the effectiveness of the algorithm     

Development of TY-3 Microgravity Rocket System

TY-3微重力火箭总长 6 0 0 0 mm,起飞质量 1 1 0 0 kg,有效载荷 5 0 kg,最大飞行高度 2 2 0 km,能提供 1 0 - 4 g约 36 0 s时间的微重力试验条件 ,该火箭已于 2 0 0 0年 1 0月飞行试验成功 ,而且一种更先进的微重力火箭系统正在设计中。