查询词典 roundness

It showed the correctness of the criteria of roundness error and relationship between the minimum zone circle, minimum circumscribed circle and maximum inscribed circle and the effectiveness of the methods for evaluation of roundness error.

也验证了圆度误差判别准则及最小区域圆、最小外接圆和最大内接圆特征点间的相互关系的准确性和误差评定方法的有效性。

Based on the criteria of roundness error, the definition of the circumscribed circle and inscribed circle with the least roundness error was given. The solution to the circumscribed circle and inscribed circle with the least roundness error was proposed when they met with the criterion of obtuse triangle.

根据圆度误差评定的判别准则，给出具有最小误差的外接圆和内接圆的定义，并提出了解决具有最小误差的外接圆和内接圆满足钝角三角形准则时的误差评定方法。

Thus, evaluation of the minimum zone circle could be solved effectively.Three methods of assessment of roundness error were proposed in this dissertation. Based on the criteria of the minimum zone circle, minimum circumscribed circle and maximum inscribed circle and convex hull, a unified approach was proposed to evaluate roundness error of the minimum zone circle, minimum circumscribed circle and maximum inscribed circle. Evaluation of the minimum zone circle, minimum circumscribed circle and maximum inscribed circle was fulfilled with rotation based the contact pattern. The minimum circumscribed circle and maximum inscribed circle were evaluated with curvature and the curvature circle.

本文提出了三种圆度误差评定的方法：根据最小区域圆、最小外接圆、最大内接圆在极坐标系下的判别准则，利用计算几何中的凸壳理论，提出了一种统一的评定方法，实现了对最小区域圆、最小外接圆、最大内接圆的误差评定；基于接触斑点的检验原理，利用旋转法，实现了最小区域圆、最小外接圆和最大内接圆的误差评定；利用曲率和曲率圆，实现了对最小外接圆和最大内接圆的误差评定。

The optimization algorithms are commonly used to approach the minima of the roundness objective functions through iteration when a microcomputer is applied to assess roundness errors by minimum zone, minimum circumscribed circle, and maximum inscribed circle methods.

引言在用计算机求最小区域、最小外接圆和最大内切圆评定法求圆度误差时，广泛采用最优化算法，通过迭代去逼近目标函数的极小值。

By means of analyzing the influence of OD surface roundness error on the outer raceway of bearing ring, the processing method of bearing on internal grinder electromagnetic centerless clamper was improved, the influence of roundness error on outer raceway was decreased, meanwhile, the product quality was raised with less waste products.

通过分析轴承环外径表面圆度误差对轴承环外滚道的影响，改进了轴承在内圆磨床电磁无心夹具上的加工方法，降低了轴承环外径定位表面圆度误差对轴承环外滚道的影响，提高产品质量，达到了降低废品损失的目地。

Methods The effects of the reading error and the misalignment of the probes on the accuracy of measuring and all the harmonics of roundness were analyzed; The strategy and the algorithm for optimizing the parameters of the measuring system were proposed; The distribution and propagation patterns of the measured errors for all the harmonics of roundness were studied in detail; A software for correcting the errors caused by the measurement error of the angle positions of the probes and the sensitivity difference between three probes was presented.

分析了测头读数及角位置误差对圆度各次谐波及圆周各点测量精度的影响；提出了三点法测量系统的优化策略与算法；研究了三点法测量误差的分布与传递规律；提出了克服测头定位误差以及3个测头的灵敏度不一致影响的软件校正方法。

Roundness tolerance of pitch diameter Roundness tolerance for a minimum of 345o circumferential arc of the pitch diameter shall not exceed .002 inch (0.051 mm) total, or one half the pitch diameter tolerance if the pitch diameter tolerance is less than .004 inch (0.102 mm); roundness tolerance of the remaining 15o maximum circumferential arc shall not exceed .004 inch (0.102) total, provided such tolerance does not result in excrescence on the thread flank.

圆度公差沥青直径圆容忍最低限度的345o圆周弧音高直径不得超过0.002英寸（ 0.051毫米）总，或一的一半，足球场直径公差，如果沥青直径公差小于0.004英寸（ 0.102毫米）；圆的耐受性，其余15o最大周弧不得超过0.004英寸（ 0.102 ），共计提供这样的宽容不会导致在excrescence对线程的侧翼。

An evaluating algorithm of maximum inscribed circle for roundness error in the Cartesian coordinates and a measurement model of roundness error is introduced in this paper.

介绍了一种在直角坐标系下利用最大内接圆法评价圆度误差的方法，建立了圆度测量模型。

An analysis revealed very significant positive correlation between trophozoite area and nucleus area (r=0.54, P .01), trophozoite volume and nucleus volume(r=0.47, P .01), and negative correlation between trophozoite area and trophozoite roundness (r=-0.29, P .01), no significant correlation between nucleus roundness and trophozoite roundness.

相关分析显示滋养体与核的面积(r=0 。5 4 ，P 。0 1)、滋养体与核体积(r=0 。4 7，P 。0 1)相关性有显著性意义，滋养体面积和核圆度呈负相关(r=- 0 。2 9，P 。0 1)，滋养体圆度和核圆度之间无相关性。

The roundness tester is a highly precision instrument that is wildly used to measure the rotary work piece in mechanical industry. The aged roundness tester was astricted by the technique condition of that time, so its way of measurement is not at all advanced. Because these roundness testers have been used for a long time, they have a highly failure rate and their accuracy can not be insured.

圆度仪是机械工业中应用最广泛的检测回转体零件圆度误差的高精度仪器，由于老式的圆度仪受当时技术条件的限制，评定方法落后，再加上这些圆度仪的使用时间较长，使用时仪器的故障率一般都较高，测量精度也不能保证。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。