推力

Then through optimum thrust force acceleration governing equation obtained by Pontryagin maximum principle and the reasonable simplification, the optimum low thrust under the orbit elements is obtained. Finally, the optimum transfer orbit analytic solution is obtained by integrating the equations.

应用Pontryagin极大值原理建立航天器最优推力加速度的控制方程，对方程进行合理的简化，只考虑它们的一次项，忽略其它的高次项，从状态方程中得出小推力对轨道根数产生的摄动影响，然后分别对它们进行积分，从而得到最优转移轨道的解析解。

The thrust at spring of spandrel arch makes it different between compound arch bridge and ordinary arch bridge.

复拱桥腹拱拱脚对主拱有较大水平推力作用，这一水平推力使得复拱桥受力与普通拱桥有所不同。

In order to introduce tangential acceleration into the control of torpedo trajectory,equations with variable thrust have to be established.

目前的鱼雷运动方程是建立在恒推力基础上的，为了将切线加速度引入弹道控制，建立变推力方程是必要的。

In space interception,the missile produces saturation ladder-type wave propulsion and trigonal pulse propulsion.

摘 要 在空间拦截中，导弹产生饱和梯形波推力和三角形脉冲推力。

If the impulse force does not work on the centroid of projectile, the correction effect under OIT can achieve that when force work on the centroid, the machining and assemble tolerances can be lower, and a better correction can be achieved.

如果脉冲推力冲量没有作用于弹丸质心，有利触发时机的修正效果可以达到脉冲推力冲量作用于质心时的结果，降低修正弹药的加工装配精度要求，获得较理想的修正预期。

The second stage utilises a YF-24 rocket motor consisting of one 75-ton thrust YF-22 motor and a YF-23F swivelling venire motor with four 4.8-ton thrust chambers burning N2O4/UDMH.

第二级采用一台YF-24火箭发动机由一台75吨推力YF-22发动机和四台4.8吨推力的YF-23F发动机所组成，燃烧N2O4/UDMH推进剂。

The elastica deforms after it is subject to an external pushing force on the moving clamp. It is observed that when the pushing force reaches a critical value, snapping may occur as the elastica jumps from one configuration to another remotely away from the original one. Moreover, in order to transfer motion or force by this structure, we will make a research into the relation between longitudinal forces of the two ends.

在对滑动夹持端施以推力后，弹性板条会产生变形，我们观察到当推力达到临界值便会发生折断式挫曲的现象，由原先的变形跳至另一稳定的变形；此外，希望以此结构传递运动或力量，故将对两端的轴向力关系加以研究。

The characteristic of tied-arch bridge is a no-thrust arch structure by tensing the tied bar formin.

中承式系杆拱桥是拱桥家族中的一员，它的特点是靠系杆承受拱脚推力，是一种无推力的自平衡体系。

In order to investigate the basic heat transfer characteristics of the platelet regeneratively cooled thrust chamber, the second chapter focussed on the developed flow and heat transfer in the long straight regenerative cooling channels with rectangular sections.

为了解层板再生冷却推力室在传热上的基本特征，第二章重点研究流动和热充分发展的矩形截面长、直再生冷却通道内的传热问题，建立了层板再生冷却推力室二维流固耦合传热过程的数理模型，采用通用形式控制方程描述冷却剂紊流传热和通道材料内导热的共轭传热问题，从而避免了流-固区域之间的反复迭代，大大缩短了计算时间。

The change of motor thrust ,deflection angle of thrust line with scarfed angle was investigated.

应用有限体积法建立了三维守恒型N-S方程组的数值求解器，对某非轴对称斜切喷管内流场开展了数值模拟计算，研究了斜切角度变化时引起的发动机推力及推力线偏转角变化。

John Robbins lives with his family in Santa Cruz, California.

约翰罗宾和家人居住在加利福尼亚州的圣克鲁斯县。

The international background is mainly the economic ties among different nations tented to be widen and deepen at the peace and development times.

国际背景主要是和平与发展时代条件下的世界各国经济贸易联系的日益加深。