重复定位

This design takes the diesel cyclinder tank for the clamping and locating device of tank boring and designing the clamping regulations of arts and crafts of tank, we take two cylinders and one face to locate which can limit six free dgrees In order to reduce errors of tank during processing,we take standard and concurrent principle,unify principle,principle with each other for basis and selection of rough basis into order to make the orientation tight enough,it is required to insist in the principle of using the unrepeated coarse beach mark as possible as you can.

本设计以柴油机汽缸箱体为例，对箱体镗孔的夹紧和定位装置进行工艺分析和夹具的设计。在对此箱体的工艺规程采用两销一面对其进行定位以限制其六个自由度。为减少箱体在加工过程中的误差，我们考虑基准的重合原则，统一原则，互为基准原则以及粗基准的选择原则，为使定位稳定夹紧可靠，要求所选用的粗基准尽可能不重复使用原则。

Thirdly, the experiment setup of this kind of two-dimensional zero-reference grating is established. The arrangement of optical path, the design of circuit and the system software are presented in detail.

再次，搭建了二维零位光栅的性能试验和重复定位精度实验系统，对实验系统的光路布置，电路设计以及系统软件进行了详细的描述。

On the basis of kinematics analysis and model transformation, an error equation of the robot kinematics parameter is established with numerical optimization, and the optimal design for kinematics parameter is realized, which effectively increases the repositioning precision of the robot.

在运动学分析和模型变换的基础上，运用数值优化技术建立了机器人运动学参数的误差方程，实现了运动学参数的优化设计，有效提高了机器人的重复定位精度。

The other is unlined, duplicating conditions when locating a full-sized wetland in the sand and cobble of the river bottom.

另一种是内层的，当条件重复定位全面型湿沙子和鹅卵石的河流底部。

The experimental results show the validness of the mechanism analyses.2. According to the generation mechanism of the leak acoustic signal, the characteristics of the leak acoustic signal are investigated. The auto correlation technology is adopted to descript the leak signal characteristics due to the ability to analyze the coherence of time series. A new procedure to identify the leak acoustic signal from the disturbed noises is proposed based on the conjunction of correlation and approximate entropy algorithm.3. The principle and application in leak location of the correlation and the adaptive filter techniques are introduced. The problems of the traditional leak location methods are analyzed.4. In order to establish the leak detection signal model, the leak acoustic propagation characteristics are investigated experimentally.

从泄漏声产生机理出发，分析了管道泄漏处湍流拟序结构与空泡间相互作用的机理，认为在该机理作用下，泄漏声信号产生过程具有&不可重复&的特征；由于相关函数具有分析时间序列拟序结构的能力，且近似熵从统计的角度区别时间过程的复杂性，因此，提出将信号相关分析和近似熵理论相结合的方法，提取泄漏声信号&不可重复&的特征，辨识管道泄漏故障发生；在实际检测现场，由于各种管内和管外固定声源噪声(如阀门噪声、工地施工噪声等)常导致泄漏误判和漏点定位错误，重点分析了管内固定噪声源的产生机理和特征，为复杂干扰环境下的泄漏辨识提供理论支持。

Then, position accuracy and resetting accuracy are measured in experiments.

并对PMLSM驱动装置的定位精度和重复定位精度进行了实验研究。

In design in calculating, have lathe horizontal to enter give main composition part of organization to numerical more control authors of this text mainly: Ball guide screw vice, bring, bring wheel, exchange servo electrical machinery, vice guide and transfer to location knife rest, etc.

其中，主要论述了两种不同的横向手动进给装置，亦即两种不同的设计方案。通过对两种不同设计方案的优缺点比较，根据提高定位精度、重复定位精度等因素，最终确定设计方案二为本次设计的设计方案。

Trades the knife equipment to have automatically to have trades the knife time short, the cutting tool repetition pointing accuracy high, the enough cutting tool margin, the area small, safe reliable and so on the characteristics.

自动换刀装置应当具备换刀时间短、刀具重复定位精度高、足够的刀具储备量、占地面积小、安全可靠等特性。

Every machine is inspected by the renishaw laser intervervrne instrument which can amend the screw-pitch error,recrse clearance,positioning accuraacy of the machine.

每台机器均使用雷尼绍双频激光干涉仪校正，精确的对螺距误差、定位精度、重复定位精度等做出检验补正，以确保机器之动态、静态稳定性及加工精度。

Fotographic repeated the level of a direct impact on the efficiency of the seihan, phototypesetting and business card printing and membership card production quality.

胶片重复定位精度的高低直接影响到制版，照排的效率和制卡和会员卡制作质量。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。