飞行器

The results show that the present design of TPS can meet the requirements of the hypersonic aircraft.

整个数值计算过程对高超声速飞行器热结构的设计与分析提供了一些有益的参考。

Finally, the flight control system of aerospace vehicle under hypersonic condition is designed by using the proposed method.

最后，将该算法用于空天飞行器姿态控制系统的设计，仿真结果表明了该算法的有效性。

First of all, the generic hypersonic vehicle longitudinal model and its stability was studied.

首先，研究了高超声速飞行器纵向模型及其稳定性问题。

Therefore, it is essential to design flight controllers with high non-linear control ability and robustness for hypersonic aircrafts.

为了掌握高超声速飞行器复杂的动态特性，建立了其模型的微分方程，方程包括刚性和弹性模态。

By analyzing the results obtained above, the dynamic characteristics and flight specialty of hypersonic vehicle can be understood.

此外，还能为高超声速飞行器的飞行控制系统设计提供适当的被控对象。

Furthermore, it is possible to provide appropriate objects to design flight control systems for hypersonic vehicle.

针对高度非线性和强耦合的高超声速飞行器数学模型，引入了反馈线性化原理，将其非线性的数学模型转化成符合控制设计要求的等效线性模型。

With the progress of the research and application of modern aerospace technology, the development of hypersonic vehicles has been pushed to a new climax.

伴随着航空宇航技术的研究及应用的不断发展，高超声速飞行器的研制逐渐步入高潮。

Abbas ibn Firnas was the first person to make a real attempt to construct a flying machine and fly.

Abbas ibn Firnas是第一个真正试图制造飞行器的人。9世纪时他设计了一个有翅膀的器具，有点像鸟儿状的服装。

This is just illustrative of what a UAV would look like.

这是一个其无人飞行器看起来象什么的示例。

Firstly, This paper processes geometry filtration based on character of orbit's apogee and perigee after orbit model is analyzed and based. Secondly Space Debris is separated into two kinds, coplanar and not coplanar according as location interrelation of target and debris. In Dynamic filtration's processing, considering prediction time limit and orbit perturbation, secular effects which have increaser effect is considered so that some need catching danger time point is appeased, some law about time when target and debris pass intersectant line each other is inferred, when debris and object are in different plane and some similar law also is inferred otherwise. The time list is arithmetical progression. These laws can improve calculation efficiency remarkably; Lastly orbit predict is a course approaching least distance. Danger time point in the last step become beginning time point from which debris and object's position and velocity are calculated by SXP4 Model which is an analytic model.By result, determine that relative movement trend is closer or apart, farther calculate the interval apart from time when predictive least relative distance occurs. Least relative distance and time when least distance occurs is calculated finally. It is a fast approach course adopting varied interval.

本文在分析、建立轨道摄动计算模型的基础上，首先采用基于轨道远、近地点特征对大量编目在册的空间碎片进行初步几何静态筛选，然后根据碎片与目标轨道面的相对位置特点把碎片分为异面与准共面两种情况以进行动态筛选，在筛选过程中考虑到预报时限长度和轨道摄动影响，引入了轨道摄动中具有积累效应的长期项以满足危险时间点的捕捉要求，利用了长期项摄动变化线性的特点导出了碎片与目标异面情况下各自过交线的时间序列成准等差数列的规律性和准共面情况下类似的规律性，从而显著地提高了前期轨道筛选的计算效率；最后对剩余危险碎片和目标飞行器利用SXP4轨道预报模型在前期轨道筛选的基础上以各个危险探测时间点为预报的时间起点，并根据预报计算结果，分析目标和碎片在该时间点的运动趋势是相互远离还是相互接近，推出预计最小相对距离发生时刻相对此刻的时间长度，得到其随时间变化的局部最小相对距离以及危险距离发生的时刻和相对速度，这是一个采用变时间步长、快速逼近最小相对距离的过程。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。