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In order to understand the operation safety and pipe service life span of rear superhearter, the essay established dynamic mathematic model of single piece of screen of rear superhearter, including the following sub-models: flue gas side model, steam side and metal pipe wall mathematic model, flow calculation model and wall temperature calculation model.

为了更好地了解后屏过热器运行的安全性和管子使用寿命，本文建立了后屏过热器中单独一片屏的动态数学模型，其中包括以下几个子模型：烟气侧模型、蒸汽侧和金属管壁的数学模型、流量计算模型和壁温计算模型。

Based on the characteristics of parameterized design and key technologies of knowledge based engineering, and specially according to the characteristics of the construction, figure, assembly-parameter of bicycle frame design, the article has achieved repeated using of experiential parameter and knowledge by adopting methods such as automatic reading experiential datasheet, computing parameter by making use of program, manual data-input or modifying and so on. Based on analyzing the characteristics of Rear End design and the associated characteristics with Chain Stay and Seat Stay, different design methods are analyzed in detail, and rapidly assembling of Rear End, Chain Stay and Seat Stay is achieved by using the method of combining top-down-assembly with down-top-assembly method. Based on analyzing special technologies and UDF characteristics, the repeated using of different sectional shapes by using UDF technology on the tube section design is also achieved, and this will greatly shorten the time spent on fixing the dimensions and orientations on sketches.

在探讨了参数化设计技术特点和知识工程关键技术的基础上，针对自行车车架设计中的结构、形状、装配参数特点，分别采用了读入经验数据表、参数程序求解、手工录入或修改方法实现车架设计经验参数和知识的重复利用；在分析自行车后叉片设计特点及与平、立叉的关联特性的基础上，对不同的设计方案进行了详细分析，并采用自顶向下和自底向上相结合的方法，实现了后叉片的快速装配定位与平、立叉设计相关联；在分析了特征技术和UDF特点的基础上，将UDF用于管件截面的设计上，使各种截面形状能不断重复利用，大大节省了约束草图尺寸和位置的时间。

The main theoretical studies of this dissertation are rear axle about design and analysis from vehicular drive, economic, brake, stability to smooth-going etc. The theory of rear axle about design and analysis was deeply studied with using model mathematics and computer technology.

本文以驱动桥设计与分析理论问题为主要研究对象，从汽车的动力性、汽车的经济性、汽车的制动性、汽车的操纵稳定性、汽车的平顺性等方面考虑，运用现代数学与现代计算机技术，对驱动桥的设计与分析理论进行了深入细致的研究。

Behind the cabin, positioned in front of the rear axle, is the V8 FSI engine, a sculptured piece of engineering visible both through the large, shield-shaped rear window and from inside the car.

机舱后面，在后轴前方，是V8 FSI发动机，有形的工程雕塑作品都通过大，盾形的后窗和车内。

Among the options available on the new crossover are a power rear liftgate, a seven-inch touch-screen navigation system with a 40-gigabyte hard drive, and a rear-seat DVD entertainment system that features two independent screens.

其中可供选择的新的交叉是后座电动尾，有7英寸的触摸屏导航系统，拥有40 - 30GB的硬盘，和后座DVD娱乐系统，配备了两个独立的屏幕。

The 760i comes with or offers every gadget currently available on lesser 7-series models, including standard electronic dampers, stability control, and front and rear air suspensions with a self-leveling function in the rear.

的760i配备或提供每一个小工具目前可在较小的7系列车型，包括标准的电子阻尼器，稳定控制，前部和后部空气悬架与自流平功能后方。

The kink in the rear pillar "is highly distinctive and helps rear airflow," says Nakamura,"and it also gives the GT-R a really unusual roof line, which I like."

卷缩在后方支柱&，是非常独特的，并帮助后方气流的，&中村邦夫说，&而且，还赋予了gt -类风湿性关节炎真的不寻常的屋顶线，我很喜欢&。

The modifications put into production of the WTCT-6A, included a reshaped lower front bow, stronger tow bar assembly, a wooden bumper system around the sides and rear surfaces, hinged support legs and larger reflectors on the rear of the trailer.

修改投产的wtct - 6 A条，包括重塑较低的前弓，更强的拖车大律师公会大会，木制的保险杠系统左右两侧和后方的表面，铰链支持的腿和较大的反射对后方的拖车。

Instead, the rear end is dominated by other design features emphasising both the wide track and the aerodynamically optimised rear look of the car.

相反，尾部则是由其他设计为主的特点，强调无论是宽阔的赛道和空气动力学优化赛车的后部。

However, at the touch of a button, telescopic wings emerge from the roof; a rear propeller pops up from the trunk; the "spoiler" becomes a vertical stabilizer that extends up over the car; and, finally, a pair of horizontal stabilizers appear from just behind the rear wheels.

不过，只需轻摁按钮即可弹出伸缩机翼；后面的螺旋桨从车厢来出现；&扰流器&变成垂直稳定翼，延伸至整个汽车；最终，两个水平稳定翼会从后轮后面现身。

The work of this paper is as follows: 1. Looking back the progressing history of the linear motor, introducing the features of the elevator driven by linear induction motor, radicating the topic of this paper "the digital frequency variable control of the elevator bi-side direct driven by linear induction motor". The research of this paper covers the conventional VVVF control, space vector based VVVF control, vector control and DTC.

本文主要开展了以下几个方面的工作： 1 回顾了直线电机发展历史，电机的驱动技术演变，特别是针对直线电机的驱动，简要介绍了直线感应电机驱动电梯的优点和不同结构类型，对传统的v／f控制，基于空间矢量法的v／f控制，矢量控制，和基于电压空间矢量的直接转矩控制进行了比较，确立了本课题的研究主题：直线感应电机双边直推式驱动电梯的全数字变频控制。

The article combines with the treatment of a superficial civil air defense work to introduce how the grouting method to improve the performance of the backfill soil.

文章从治理漂浮人防工事的角度提出了注浆技术在改善回填土性质方面的应用，并详细阐述了注浆技术的施工流程。