精度

Aim at disadvantages of traditional measuring methods,such as lower precision and complicated operations,a precise measuring method for pitch circle helix angle of involute spur gear by CMM was put forward.

针对渐开线圆柱斜齿轮分度圆螺旋角的传统测量方法精度低、操作复杂等缺陷，提出用三坐标测量机精确测量圆柱斜齿轮分度圆螺旋角的方法，介绍了其测量原理及步骤，并进行了测量精度分析。

This study refers to the conditions of practical powder metallurgy manufacture process, and proceeds to experiments and gear precision measurements as well as investigation on the effects of two parameters, powders and pitch circle radius, on gear precision. The relationship between gear parameters and gear surface deviations was derived from the mathematical model for the involute helical gears and the analysis of gear surface deviations.

本论文将采用实际上粉末冶金螺旋齿轮的制程条件，进行试作实验与齿轮精度的量测，以探讨粉末及螺旋齿轮之节圆半径这两个制程参数对於齿轮精度的影响；同时应用齿轮创成原理所推导之螺旋齿轮数学模式，配合齿面变异分析，求得齿轮设计参数改变量与齿面变异量之关系。

Choose the NDIR air analysis apparatus and Pitot tube using in the CEMS(continuous emission monitoring system) which is more suitable to plants environment and more precise. Use the coal's amount entering the boiler and its corresponding gas emission measuring to fulfill the coal's ultimate analysis on-line.

在普遍采用的CEMS烟气排放连续监测系统中应用适合现场测量、反应快速的非分光红外气体分析仪和毕托管流量计等，用高精度的测量来提高软测量的计算精度。

Factory design and production of various high-precision zoom lens, projector lens and as high as /20 flatness of the plane mirror is widely used in a variety of measuring instruments; factory production testing of optical imaging lens, the resolution of 2300000 pixels, relative distortion of 0.05%, which is high-precision imaging and quality measurement of choice for detection.

本厂设计生产的各种高精度变焦镜头、投影仪物镜及平面度高达λ/20的平面镜，广泛应用于各种测量仪器；本厂生产的光学影像检测镜头，其分辨率达到230万像素，相对畸变为0.05％，是高精度影像测量及品质检测的首选。

Based on the 2 sets of CPI-accuracy plane coordinates composed by the 14 GPS control points along the Hunan-Guangxi railroad line, we carried out coordinate transformation using the Similarity Transformation Method and the Affine Transformation Method in different common point numbers and position distributions.

以湘桂线14个GPS测量点的两套CPI精度的控制点平面坐标为依据，分别用相似变换、仿射变换及不同公共点个数求转换参数进行坐标转换，分析成果精度之间的差异及规律。

The engage gears noise analysis of the planet cycloidal needle wheel decelerator showed that manufacturing errors of key positions of spare parts such as cycloidal wheel,needle wheel,output shaft and lack impartiality set etc.

通过对行星摆线针轮减速机轮齿啮合噪声分析，表明摆线轮、针轮、输出轴和偏心套等零件关键部位的制造误差是产生噪声的主要原因，从工艺角度提出提高零件制造精度和专用胎具精度降低噪声的方法。

The experimental results show that the affine model works best in the test area. The accuracy can reach to 0.6~0.8 m in planimetry and about 1.0 m in elevation based on the affine model by using 5~6 well distributed control points.

实验结果表明，在该区域使用一阶仿射变换模型进行补偿，在5~6个均匀分布的控制点支持下，即可达到0.6~0.8m的平面精度和1.0m左右的高程精度。

An optimal nonlinear compensation transmiting circuit of temperature measure was designed,which measuring using platina resistor stimulated by constant current source.

设计铂热电阻恒流激励测温的最佳非线性补偿变送电路，同时利用半导体致冷器件即可加热又可致冷的双向特性，制成以半导体致冷器为冷/热源的高精度控温系统，在20~40℃，控温精度高达±0。

The parts are cast parts. In the processing, it is easier to ensure the processing accuracy of plane than the hole. So the parts' main planes are hole, two blades of the Plectrum and groove.

它的主要加工面是孔、拨叉叉口两端面和槽，在加工中由于面的加工精度要比孔的加工精度容易保证。

The parts are cast parts. In the processing, it is easierto ensure the processing accuracy of plane than the hole. So theparts' main planes are hole, two blades of the Plectrum and groove.

它的主要加工面是孔、拨叉叉口两端面和槽，在加工中由于面的加工精度要比孔的加工精度容易保证。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。