推力

The flow field of the variable thrust motor nozzle with pintle was numerically simulated,and the throat pintle contour was optimized.

1引言对喉栓式推力可调固体火箭发动机内流场进行模拟，能直观了解TCSRM内部的工作情况。

A new variable thrust liquid propellant rocket engine with thrust throttling ratio of 10:1 is developed to meet the requirement of Moon Exploration Project. A special pintle injector derived from correlative technologies is employed.

为了我国探月计划的顺利实施，根据我们的国情和相关的技术基础，进行了新型10：1变推力液体火箭发动机的技术研究。

The breaking of pintle in experiment was finally solved by changing the material and improving the pintle configuration. The main reason of slowly climbing of pressure was found out by analyzing and some validating experiments. A pintle motor test with high combustion temperature propellant was carried also.

对调节比、自由容积和调节方向的影响进行了研究；对试验中出现的喉栓结构破坏的问题，通过改进喉栓结构设计，更换材料最终获得了满意的效果；对推力调节响应特性进行了研究，通过理论分析和验证试验找出了导致调节缓慢的主要原因；还进行高燃温的探索试验。

NTN development went Dmn to be worth diameter of 〔 bearing pitch circle × rotate speed coming back is spent 〕 is 1.5 million, but the thrust needle bearing that high speed runs.

NTN开发出了dmn值〔轴承节圆直径×旋转速度〕为150万、可高速运转的推力滚针轴承。

In Figure 7, the thrust coefficient is plotted.

在图7 ，推力系数是策划。

Oval counterweight controlled the thrust bearing of the Polar axis shaft.

椭圆形抗衡控制推力轴承极地轴轴。

Based on Pontryagin maximum principle,the lunar soft landing problem is transformed into a two-point boundary value problem in mathematics.

首先，从庞德里亚金极大值原理出发，将有限推力作用下月球软着陆问题转化为数学上的两点边值问题；在考虑边界条件及横截条件的前提下，将该两点边值问题转化为针对共轭变量初值和末时刻的优化问题；然后应用非线性规划方法求解所形成的参数优化问题。

Based on Pontryagin maximum principle, the lunar soft landing problem is transformed into a two-point boundary value problem in mathematics. In consideration of the bound condition and transversality condition, the resulted two-point boundary value problem is converted into a parameter optimization problem aiming at the initial values of conjugate variables and the terminal time, then it is solved by the nonlinear programming.

首先，从庞德里亚金极大值原理出发，将有限推力作用下月球软着陆问题转化为数学上的两点边值问题；在考虑边界条件及横截条件的前提下，将该两点边值问题转化为针对共轭变量初值和末时刻的优化问题；然后应用非线性规划方法求解所形成的参数优化问题。

Bearings must be able to support the crankshaft rotation and deliver power stroke thrust under the most adverse conditions.

轴承必须能够支持曲轴的旋转和提供电力中风的推力下，最恶劣的情况。

The drive mechanism for urbanization in China is made up of the economic support system and system support system. It includes the com- prehensive acting force formed by the "pull" from the urban areas, the "push" from the rural areas and the "resistance" from the operating system platform.

中国城镇化的动力机制由经济支持系统和制度支持系统组成，它包含了来自城镇的"拉力"、农村的"推力"与运行制度平台的"阻力"形成的综合作用力，推进中国城镇化的主动力是工业化。

The X-ray diffract was used to analyze the crystal structure of the composite. Results show that after the talc was treated with blend coupling agent, the crystal structure of talc changed, and effect Intercalation phenomenon.

通过X射线衍射分析可知，用混合偶联剂对滑石粉进行预处理后，滑石粉晶体结构发生改变，产生了插层现象，使PP／滑石粉复合材料为纳米复合材料。

An authentic Maui wedding might require the services of a 'kahu', which is a Hawaiian minister.

毛伊可能需要一个真实婚礼服务'kahu'，这是夏威夷部长。