5 resultados para Lance (Missile)

em Chinese Academy of Sciences Institutional Repositories Grid Portal


Relevância:

10.00% 10.00%

Publicador:

Resumo:

基于椭圆锥相交流场,采用非轴对称设计方法生成了一种带火箭增程的乘波外形高超声速导弹,并在给定攻角条件下对乘波外形导弹的弹道进行了仿真。仿真结果表明:导弹的飞行轨迹为波浪形;在满足热防护的条件下,给定乘波外形和初始滑翔速度的导弹存在一个较优的初始滑翔高度;导弹自带增程火箭的点火时间越早,其飞行距离越远。

Relevância:

10.00% 10.00%

Publicador:

Resumo:

Rare earths are a series of minerals with special properties that make them essential for applications including miniaturized electronics, computer hard disks, display panels, missile guidance, pollution controlling catalysts, H-2-storage and other advanced materials. The use of thermal barrier coatings (TBCs) has the potential to extend the working temperature and the life of a gas turbine by providing a layer of thermal insulation between the metallic substrate and the hot gas. Yttria (Y2O3), as one of the most important rare earth oxides, has already been used in the typical TBC material YSZ (yttria stabilized zirconia). In the development of the TBC materials, especially in the latest ten years, rare earths have been found to be more and more important. All the new candidates of TBC materials contain a large quantity of rare earths, such as R2Zr2O7 (R=La, Ce, Nd, Gd), CeO2-YSZ, RMeAl11O19 (R=La, Nd; Me=Mg, Ca, Sr) and LaPO4. The concept of double-ceramic-layer coatings based on the rare earth materials and YSZ is effective for the improvement of the thermal shock life of TBCs at high temperature.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

文中研究的相关跟踪技术主要应用于飞航导弹的末制导。现阶段,激光制导技术、GPS制导技术、合成孔径雷达(SAR)制导技术在我国的实际应用还不成熟,传统的电视、红外制导技术仍然具有很强的生命力,因而,基于可见光的视频相关跟踪技术具有重要的研究价值。本文主要论述的两种相关算法是:多灰度点相关(MPC)、区域模板相关(RTC)。其中多点相关(MPC)算法的跟踪灵敏度高,定位精度好,硬件实现比较方便,实时性能好;区域模板相关算法(RTC),在图像的匹配过程中,不仅考虑了目标区域的灰度特征,而且兼顾了区域里多灰度层次的位置特征、面积特征,算法具有很好的鲁棒性。文中深入研究了两种相关跟踪算法,并针对它们在实际应用中的不足,提出了有效的改善措施。最后,本文对两种相关跟踪算法进行了初步融合,一是:通过粗匹配、精匹配过程来选取目标跟踪点;二是:提出了一种度量模板更新的能量准则函数。大量的仿真实验结果表明:改进后的两种相关跟踪技术可以较好地完成一些复杂背景下的目标跟踪任务,两种算法的有效结合又进一步提高了目标跟踪的稳定性能和可靠性能。本文研究的一些相关跟踪技术已经运用到实际工程项目中。

Relevância:

10.00% 10.00%

Publicador:

Resumo:

提出了求解某武器系统导弹弹道轨迹的两种方法:计算机仿真和系统辨识方法.详细介绍了导弹系统的计算机仿真模型,并利用控制理论和数值分析的方法对仿真模型求解;根据系统辨识理论,将整个系统看作“黑箱”,建立与输入、输出数据等价的模型,引入折息因子对模型进行辨识.最后分别给出了计算机仿真试验曲线和系统辨识试验曲线,证明了两种求解方法的有效性。