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直线度误差的评定方法,根据评定基准线的不同,可以分为包容线法、两端点连线法和最小二乘法。包容线法和两端点连线法计算导轨直线度误差,《机械制造》1982年第4期“床身导轨精度的计算”一文已作介绍、本文介绍最小二乘法计算直线度误差。把误差曲线的一元回归直线作为直线度的评定基准线,作图计算直线度的方法,由于回归直线的回归系数是用最小二乘法计算的,故此法称之为最小二乘法。一、原理按回归分析方法,我们用一元回归直线作为误差的评定基准线。其方程为: y=ax+b(1)式中回归系数a、b通常用最小二乘法来计算。设在测量长度每一档x_i上,对应着直线度误差实
Straightness error assessment method, based on the assessment of the baseline, can be divided into inclusive line method, the two ends of the connection method and the least square method. Inclusion of line method and the two ends of the connection method to calculate the straightness of the guideway error, “Machinery Manufacturing” 1982 the fourth period “bed guide rail precision calculation” article has been introduced, this article introduces the least square method to calculate the straightness error. The error curve of the linear regression line as a straight line to assess the baseline, the method of calculating the straightness method, the regression line regression coefficient is calculated using the least squares method, so this method is called the least square method. First, the principle of regression analysis, we use the linear regression as the baseline error assessment. The equation is: y = ax + b (1) where the regression coefficients a, b are usually calculated using the least squares method. Set in the measuring length of each file x_i, corresponding to the straightness error real