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三点法中测头最佳角位置的确定方法 总被引:1,自引:0,他引:1
论述了三点法圆度及轴系运动误差测量系统中确定三个测头最佳角位置的方法。通过分析测头读数误差对圆度各次谐波测量精度的影响,提出了确定三个测头最佳角位置的优化策略,基于MonteCarlo思想和单纯形模式搜索方法编制了高效、高精度的寻优程序,优化得到三个测头的最佳角位置。研究表明:在误差分析的基础上对三个测头的角位置进行优化能很好地解决三点法圆度测量形状失真问题,随机模式搜索寻优是确定测头最佳角位置的有效手段。 相似文献
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三点法中测头角位置的精密测量方法 总被引:2,自引:1,他引:1
研究了三点法圆度及轴系误差测量中测头角位置的精密测量方法。设计了能直接测量非接触电容传感器测头实测状态下的角位置的测角系统,提出了克服测头角位置测量误差及三个测头灵敏度标定误差影响的校正方法。实验表明:采用本文提出的“多刻线”法测角精度优于1′,测头角位置测量误差及三个测头灵敏度标定误差对测量精度的影响可降致最小。 相似文献
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为了保证和提高转台测角系统的现场测量精度,本文针对基于傅里叶变换的转台分度误差分离与补偿方法开展研究。在原理证明傅里叶变换实现转台分度误差分离的基础上,建立转台分度误差与读数头测量值之间的函数模型;根据傅里叶变换中传递函数性质,重点说明双读数头安装角度间隔与测量误差谐波阶次间关系,优化了双读数头布置;在现场可编程门阵列电路平台上实现多读数头测量值的同步获取,采用坐标旋转数字计算方法完成谐波误差函数实时计算。搭建实验平台进行误差分离与补偿效果验证实验,实验结果证明采用优化布置的双读数头信号进行分度误差分离并补偿后,转台的分度误差峰峰值由57.58″减小到3.36″,补偿后的转台测角系统扩展测量不确定度为0.9″(k=2)。 相似文献
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针对精密加工过程中影响圆度误差分离精度的问题,提出了一种基于几何动态模型的圆度误差分离模拟方法。在主轴空间运动规律的基础上,通过回转体轴心的自转和公转关系建立工件截面的几何模拟动态模型。结合三点法圆度误差分离技术实现了动态条件下的圆度误差准确表示,并分析研究了传感器安装角度与干扰误差对圆度误差分离精度的影响。数值实验分析表明,建立的几何模型分析有利于研究回转加工中圆度误差分离结果的正确性,达到了提高误差分离精度及抑制误差对加工精度影响的目的。 相似文献
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The three-probe method is the most widely used technique for separating the artifact roundness error from the spindle error, with the superiority available for in situ measurement. For further improving the measurement accuracy of the three-probe method, in this paper, the harmonic measurement errors are investigated analytically and experimentally. To achieve this aim, firstly, according to the transfer matrices W(k), the harmonics are classified into two types: the suppressed harmonics with zero W(k) and the unsuppressed harmonics with no-zero W(k). Then, on one hand, through mathematical deduction, the formulation for determining the suppressed harmonics is derived; on the other hand, the measurement errors to the unsuppressed harmonics are experimentally acquired, and the experimental results demonstrate that the measurement errors to the unsuppressed harmonics are greatly related to the determinant of the transfer matrix |W(k)|, but not rigorously in inverse proportion to |W(k)|. Based on the conclusions drawn from the investigations, a hybrid three-probe method is constructed, where several conventional three-probe measurements are performed for optimizing individual harmonic coefficients. Experiments verify that the hybrid three-probe method is more robust to the error sources than the conventional method. 相似文献
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This paper presents a new multiprobe method for roundness measurements called the mixed method. In this method, displacements at two points on a cylindrical workpiece and an angle at one of the two points are simultaneously monitored by two probes. The differential output of the probes cancels the effect of the spindle error, and deconvolving the differential data yields the correct roundness error. The mixed method is compared to the traditional 3-point method with respect to the transfer function and resolution. Unlike the 3-point method, the mixed method can completely separate the roundness error and the spindle error, and can measure high-frequency components regardless of the probe distance. Resolution can also be improved throughout the entire frequency domain by increasing angular separation of the probes. An optical sensor specifically suited to the mixed method is designed and used to make roundness measurements. A fiber coupler and single-mode fibers are used in the sensor to divide a light beam from a laser diode into two beams, resulting in a compact sensor with good thermal drift characteristics. The displacement meter of the sensor is based on the imaging system principle and has a resolution of 0.1 μm. The angle meter is based on the principle of autocollimation and has a resolution of 0.5 in. A measurement system is constructed to realize measurements of roundness by using the optical sensor. Experimental results confirming the effectiveness of the mixed method for roundness measurements are also presented in this paper. 相似文献
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This paper presents a new error separation method for accurate roundness measurement called the orthogonal mixed method. This method uses the information of one displacement probe and one angle probe to separate roundness error from spindle error. This method was developed from the mixed method, which uses the information of two displacement probes and one angle probe to carry out the error separation. In the present paper, the relationship between the characteristics of the mixed method and the probe arrangement is analyzed. Well-balanced harmonic response of the mixed method is verified to be obtainable for the case where the angular distance between the displacement probe and the angle probe is set at 90°. This orthogonal mixed method also had the simplest probe arrangement, because it requires only one displacement probe and one angle probe to realize the error separation. Optical probes were used to construct an experimental measurement system that employs the orthogonal mixed method. The displacement probe and the angle probe both use the principle of the critical angle method of total reflection, and they have stabilities of 1 nm and 0.01 in., respectively. The measurement results show that roundness measurement can be performed with a repeatability on the order of several nanometers. 相似文献