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Engineering College, Air Force Engineering University, Xi'an Shaanxi 710038, ChinaAbstract: The math model of the movement, flux and control system of position pump was established by analyzing its working principle, and its hydraulic system simulation model was established based on AMESim. The pressure and flux pulsation of the position pump was analyzed, and the pressure and flux was calculated by simulation when there are sign of wear for the position pump and system flux change.

分析了恒压力轴向柱塞泵的工作原理，推导并建立了液压泵压力流量和压力调节机构的数学模型，并在此基础上以AMESim工程软件为平台建立了轴向柱塞泵的仿真模型，分析了压力流量脉动状况并对液压泵在内部磨损和系统流量变化两种情况下的压力流量进行了仿真计算，对两种情况下泵的工作情况进行分析比较，为液压脉动抑制和故障分析提供了参考。

The D 玲 was broken with fresh and clear political consciousness over 20 centuries, the motion frame of female writing, become a special existence, in her creations process, political position and rank position melt mutually to living mutually, but the politics of D 玲 participate enthusiasm, is condemned for the imperfection of female position, is returned the knot as the body of"male qualities" more now, deviated from the female guarded securely by feminism in include the political realm of and the male's overall equal and original and early concept.

急用！请英语高手帮忙翻译一下论文摘要，不要在线翻译，谢谢！！！摘要：丁玲以鲜明的政治意识打破了20世纪以来，女性写作的情绪框架，成为一个独特的存在，在她的创作过程中，政治立场和阶级立场相融相生，而丁玲的政治参与热情，被斥责为女性立场的缺失，更被归结为&男性气质&的体现，背离了女权主义者所坚守的女性在包括政治领域内的与男性的全面平等的原初概念。

This switch is used for compounded type transformer. It is classified into four-position and two-position products. The four-position switch is divided into "T" type 、"V" type and "I".

本开关应用于组合式变压器，负荷开关有四位置和二位置开关，四位置开关按结构形式不同可分为T型、V型和I型。

Rotomolding production areas in the country, especially in rotomolding equipment, rotomolding die, we After 20 years of study, research, has developed a three-position swing-style single-arm, three-position-and from the single arm, the five-position And from the arms of different models of rotomolding machine.

在国内滚塑生产领域，尤其在滚塑设备、滚塑模具方面，我们经过20多年的探讨、研究，先后研制开发了三工位摆动式单臂、三工位往返式单臂、五工位往返式双臂等不同型号的滚塑成型机。

In this design, according to the principle of crank-rocker, a special four-bar linkage swaying mechanism combined with the flexible tail fin is adopted to guarantee the stable swimming of robofish. The skillful application of hall position sensors achieves the detection of critical position of the swing link, which makes it possible to detect the position of the tail fin and control the turning of robofish. For effective raising and lowering, a mechanism using a cylinder as a pump to imitate the swimming bladder is developed.

在该方案中，应用曲柄摇杆原理，采用了特殊的四连杆摆动机构，结合柔性尾部实现了机器鱼的摆动式推进；巧妙应用了霍尔位置传感器，检测摆杆临界位置，实现了鱼尾位置判断，进而控制鱼尾来转向；研制了以气缸为压缩泵的气路沉浮机构作为&鱼鳔&，能使机器鱼进行沉浮动作。

The position-lock can be used to set the valve in any position or as a memory stop so the valve may be reopened to the previous position.

位置-锁定可以用于将阀门设定在任何位置或记忆停止位置，使得阀门能够重新开启到以前开启的位置。

The position lock can be used to set the valve in any position or as a memory stop so the valve may be reopened to the previous position.

定位锁可以用来将阀门固定在某个开启状态，或者记忆着上次操作开启的位置，以便以后能够将阀门重新开启到原先的位置。

The position lock can be used to set the valve in any position or as a memory stop so the valve may be reopen ed to the previous position.

定位锁可以用来将阀门固定在某个开启状态，或者记忆着上次操作开启的位置，以便以后能够将阀门重新开启到原先的位置。

Because the support position of bearing has great effect to the frequency of coupled vibration of shafting, this paper researches the dynamic alignment problems of shafting at first so as to determine the support position of bearing rationally, especially the position of stern tube bearing.

由于轴承的支承点位置对轴系的耦合振动频率影响很大，所以本文首先研究了轴系的动态校中问题，以合理确定轴承特别是艉管轴承的支承点。

A few differences from the Competitive Fit in addition to a taller front end and less saddle/bar drop is a less craned neck and easier forward-looking position, slightly less weight on the hands and more on the saddle and pedals, and a knee position that usually moves a bit behind the spindle (rather than a knee-over-the-spindle position, thus adding a bit of power).

与竞技设定相比有几点不同，较低的落差与较舒适的颈部角度，且可将较多的体重比例分配给坐椅与踏板，以及膝盖位置通常都会比踏板轴心位置后退一点点（而不是膝盖超过踏板轴心，为了增加一点力量。

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。