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ChapterⅢ,system model of chapter II was simplified as the free vibrationmodel of the system to solve the inherent vibration frequency and vibration mode.The inherent vibration modes are divided into three categories:torsional vibrationmode of central component,translational and torsion pendulum vibration mode of thecenter component and planetary gear vibration mode.

第三章对第二章建立的系统模型简化为自由振动模型，求解了系统的固有振动频率及振型，将各工况下的固有振型分为三类：中心构件扭转振动模式、中心构件平移扭摆振动模式和行星轮振动模式。

The three-roll planetary rolling process of copper alloy tube was simulated and analyzed by finite element method .

目前三辊行星轧制紫铜管坯的技术已相对成熟，而利用三辊行星轧机轧制铜合金管坯的实验和研究却相对很少。

The three-roll planetary rolling process of copper alloy tube was simulated and analyzed by finite element method .

对B10铜合金管坯旋轧成形过程进行三维热力耦合仿真模拟。

The structural principle, rolling mechanism and movement rules of the three-roll planetary mill have been introduced.

阐述了三辊行星轧机的结构原理、轧制机理及其运动情况，在对三辊行星轧机分析研究的基础上，设计制造了一种新型三辊旋轧试验机。

The forcasting value of the simulation was approved by experiment results. So the finite element method can be used on other kinds of copper alloy tubes in three-roll planetary rolling process.

相应实验结果证明铜合金管坯有限元模拟具有很好的仿真预测价值，并可用于探索其它类型铜合金管坯旋轧成形规律。

This image from the Hubble Space Telescope reveals theCat's Eye Nebula to be one of the most complex planetary nebulae known.

这张来自哈伯太空望远镜的影像，透露出猫眼星云是现知结构最复杂的行星状星云之一。

Planetary reducer selection of the overall design of the sun round the floating bodies are set, the sun wheel gear coupling with a single high-speed shaft connected to the realization of floating, the floating floating method is sensitive, simple structure, easy to manufacture, easy to install.

行星减速器的总体方案设计选用太阳轮浮动的均载机构，太阳轮通过单齿联轴器与高速轴联接实现浮动，这种浮动方法浮动灵敏，结构简单，易于制造，便于安装。

Sun wheel and planetary gear are made of post-carburized hardened grinding teeth gear while internal gear is of quenching and tempering gear.

工作时太阳轮浮动，以便使其轮齿同时和三个行星轮均匀接触，达到均载目的；行星轮安装在行星架上，在绕自身轴线传动的同时，也随行星架一齐转动。

According to the overall design of conventional design and calculation programs and the general assembly drawing, as well as round the sun, planetary plane, input shaft, output shaft of the parts diagram.

根据总体设计方案和常规设计计算绘制总装配图以及太阳轮、行星架、输入轴、输出轴的零件图。

The stub gear tooth is often adopted in the involute planetary gear transmission with a few tooth number difference.

在渐开线少齿差行星传动中通常使用短齿，其齿根高与正常齿相同，而齿顶高小于正常齿。

If you were not , and OS X just booted normally, have no fear.

如果你没有，和OS X刚刚启动通常，没有恐惧。

I only want to preserve our all .

我只想保存好我们的一切