主要部件

The operating principle and component of the shadowgraph experimental station were introduced. The clear shadowgraph of target was gained after construction. Using this technique, the calculative method of DT ice thickness and the surface roughness analytic method of target were realized. Through design simulative experiment, the shadowgraph of DT ice was got.

主要介绍了背光成像实验样机的组成及工作原理，讨论了各光学部件的选择，在原理型样机建成后，获得了玻璃微球靶高质量的背光图像，通过对背光影像的光路图分析与测量（测量精度达到1μm），掌握了靶球DT冰层厚度的计算方法；初步建立了靶球二维内外表面粗糙度分析方法；通过设计模拟实验，获得了冰层在微球靶丸内均匀分布后清晰的背光影像。

The key to this valve is in the flexible reinfoced rubber sleeve - the valve's only wetted part.

其主要原因就在于这种阀门内部的弹性强化套管，也就是这种阀门唯一与流体接触的部件。

The structure shown in the figure : The governing body received direct or roller drying cylinder, as the main components of the rotation; After finishing the outside of the sphere, Bottom Cover and soak spherical carbon graphite seal ring joint seal reliable seal friction deputy, Sealing ring in the spherical shell of its annular space sliding, in addition to oil-free bearings and with the close cooperation of Shell, Rotating connector so that the free support, and therefore do not require a high level of accuracy installed; Spherical seal ring wear, Spring means of pressure at any time in advance to receive compensation, compensation for the shell slowly moved backward, accessible through the tube outside the inscription on the line to observe the seals wear; When steam, Oil flows through the media or other spherical sealing ring and oil-free bearings, the formation of thin liquid film, sealing and lubrication, thereby reducing friction and wear, extending the service life.

其结构如图所示：外管体直接接到辊子或烘筒上，为主要的旋转部件；经过精加工的外管本球面、底盖和浸泡碳石墨球面密封环共同组成密封可靠的动密封磨擦副，球面密封环在其壳体内的环形空间中滑动，加之无油轴承与壳体的密切配合，使旋转接头自由支撑，故对装机精度要求不高；球面密封环磨损后，借助于弹簧的预压力随时得到补偿，补偿时壳体缓缓向后移动，并可通过外管体上的刻线观察到密封件的磨损程度；当蒸汽、油或其它介质流经球面密封环和无油轴承时，形成一层很薄的液膜，提供密封和润滑，从而减轻了摩擦和磨损，延长了使用寿命。

For components that are predominantly dynamically stressed and made of cast iron with spheroidal graphite, a quality level requirement shall be set according to for indications to be reported.

8对于那些由球墨铸铁制成的承受主要的动态应力的部件，必须满足EN 12680-3：2003规定的质量等级要求。

It concentrates on the development, manufacture, marketing and sales of steering column and after sales service.

合资公司在中国主要从事产品应用开发、制造和营销汽车转向柱及相关部件并提供售后服务。

The main content of this thesis is as follows: 1The structures of EPS are analyzed. The main components of EPS are introduced in detail. Then the distributed torque in EPS is analyzed and the control system model is set up. 2Three control modes are discussed and the control strategy of EPS is studied in detail. Three principal modules in the control strategy are discussed—the predicted module which predicts motor rotational speed and steering rotational speed, the power-assistant module and the return control module. 3The assistant torque curves of the motor are designed by using the B-spline, so that any kind of custom-built assistant torque curves can be designed according to different kinds of automobiles. 4The hardware frame of EPS is studied. The developed controller based on 8-bit MCU MC68HC908MR8 is introduced and many related circuit units are designed, including the control circuit, the driver control circuit and so on. The software structure is discussed, then the steering control program flowchart is given.

本文的主要工作有： 1分析了EPS 的总体构成，对EPS 的各个部件作了详细的介绍，并在此基础上分析了EPS 的受力情况，建立了控制系统模型，并研究了EPS 的安全性能； 2讨论了EPS 的三种控制方式，提出了控制策略，并讨论了其中三个关键模块的作用：预估模块包括对电机转速和方向盘角速度的预估，助力控制模块以及回正模块； 3用B 样条插值方法进行EPS 助力曲线的设计，可按照用户的要求设计任意形状的助力曲线，以满足不同车型和不同用户的要求； 4研究了控制系统的硬件结构，以MC68HC908MR8 为核心设计了控制器，详细讨论了控制器的控制电路、驱动电路等；设计了控制系统的软件，给出了控制程序流程图，并对要点进行了详细的说明。

The tail fin is significant because it is a major structural component, whose failure has contributed to past crashes.

尾翼意义重大的原因在于它是一个主要的结构部件，过去许多坠机事件都与尾翼失灵有关。

The main topic of Taphole drill's structure and design of the component parts of the body parts, Meanwhile, the author discusses some of the characteristics of the movement and the part of the calculation of the design process and the necessary strength check.

本课题主要分析了开铁口机的结构组成，设计了组成各部分的机构部件，同时论述了各部分机构的运动特点及各部分的计算设计过程和必要的强度校核。

The thruster s grid is one of the many key components in the influence of the thruster life.

推力器栅极部分是影响推力器寿命的主要关键部件之一。

The new high voltage pulse generator is mainly composed of condense capacitors, hydrogen thyratron, high voltage transformer and voltage adapter.

介绍了一种可调的高压脉冲发生器，该发生器主要由储能电容器组、氢闸流管、电压调节器、保护电路、高压变压器等部件组成。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。