时域与频域两点法误差分离技术的精度分析

The Accuracy Analysis of Error Separation for Two-point Separating Technique Method of Time Domain and Frequency Domain

为了分析时域与频域两点法误差分离技术中所包含的原理误差及该原理误差的规律和特性,建立了进行误差分离的零件模型,通过对不同影响因素的分析找到了两点法误差分离技术所含原理误差的规律和特性,并对两种误差分离技术的精度进行了比较。使用时域与频域两种误差分离技术和圆度测量仪对同一零件进行测量比对,发现仿真结果和实验结果与理论分析相符。因此得出结论:采样点数N每扩大一倍,各参数的绝对误差值的比值越来越接近于2;对置安装传感器使两点法分离结果的误差最小;在相同的采样参数下,频域法误差分离技术的分离精度高于时域法。

In order to analysis the principle of error and the principle error＇ s regularity and characteristics in the two point error separation method of time domain and frequency domain.Established a part model to march the error separation,through the analysis of different influence factors found the principle error＇s regularity and characteristics of two point method error separation technique,and compared the accuracy of two kinds of error separation technique.Using two kinds of error separation technique and roundness measuring instrument to measure the same parts,found that the experiment results and the results of simulation agree with the analysis of theory.So we can draw the conclusions：When the number of Samples—N expand 1 times,the ratio of the absolute error of the parameter value is getting closer to 2; with facing mounting the two sensors,the results of two point separation error is the smallest.;with same sampling parameters,the precision of error separation technique in frequency domain method is higher than error separation technique in time-domain method.