位置保持

The designing way of this paper about the forebody and afterbody of aerocraft is based on the wave-rider theory, so design the aerocraft upper and down surface separately, besides keeping the length and thickness of forebody and afterbody constant, to some extent ensure the whole aerocraft design target and avoid the conflict with other disciplines, The flow solver takes use of Euler equations, combining with the technique of the unstructured dynamic meshes.

文中对飞行器前后体设计思路基于高超音速乘波体的思想，将飞行器上下表面进行分离设计，在前后体的长度厚度以及发动机的位置保持不变的条件下，较大程度避免了飞行器整体外形布局的改变，从而一定程度上保证了总体设计的目标，大大缓和了与飞行器其他学科设计时的冲突。

Using inclination vector as a non-singular orbital element, engineering oriented mathematical models for inclination control of geosta- tionary orbit are established,and unified optimal strategies for inclination control both in north-south station aquisition and north-south station keeping derived.

本文以倾角矢量作为无奇点轨道要素，建立静止卫星轨道倾角控制的工程实用数学模型，进而导出南北定点捕获和南北位置保持两种情况下统一的倾角控制燃料最优策略。

Design, fabrication and test of the micro thruster were introduced in this thesis.

微推进器是一种基于MEMS技术的新型微推进系统，主要用于微小型航天器的位置保持、姿态控制、轨道调整等。

With age, the GL location regarding the heels remained constant, while the pelis moed posteriorly toward the heels and underwent a small retroersion.

随着年龄增长，关于脚后跟的重力线位置保持不便，但是骨盆朝着脚后跟向后移动并呈现轻微的后倾表现（即日益增加的骨盆倾斜度）。

The results are applicable to the missions which require north-south station keeping accuracy of 0.05°～0.1° and have been implemented in flight control of the Chinese STW-2 satellite.

本文结果适用于南北位置保持精度为0.05°至0.1°的任务，并且已经应用于我国实用通信广播卫星的飞行控制。

MEMS based solid propellant micro thruster is a new type of micropropulsion system, which is required in microspacecraft for station keeping, attitude control, gravitation compensation and orbit adjust.

MEMS固体微推进器是一种新型的微推进系统，主要用于微型航天器的位置保持、姿态控制、引力补偿和轨道调整。

The station keeping control strategy is discussed lastly.

最后讨论位置保持控制策略。

Because the specific impulse of electric propulsion is ten times more than the chemistry propulsion, it appears very important in the application of satellite attitude control and station keeping, aerocraft deep space exploring and interstellar travelling. It can increase the payload and extend life, decrease the passive weight.

由于电推进的比冲比化学推进比冲高出一个数量级，因而在卫星姿态控制、位置保持以及空间飞行器深空探索、星际航行的应用中有重要意义，它或可以提高有效载荷、延长寿命，或可以降低消极质量。

The stable state plasma engine has the high specific impulse, the high efficiency characteristic, obtained the widespread application in the satellite maintain position and the attitude control.

稳态等离子体发动机具有高比冲、高效率的特点，在卫星的位置保持和姿态控制中得到了广泛应用。

The research emphasis is restartable nitrous oxide monopropellant thruster suitable for keeping the position and phase of small satellite.

研究重点是可多次启动的一氧化二氮单元推进剂推力室，适用于小卫星的位置保持和相位保持。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。