算术平均偏差

对一标准量块进行了测量，并对光功率计分辨率对测量结果的影响进行了分析，结果表明本系统在实验室现有条件下可以测量轮廓算术平均偏差Ra为0.012μm的粗糙度量块。

The feasibility is verified by the measurement of a sample block . The effect of the resolution of the optical power detector is analyzed . The arithmetic average deviation value of the profile of a gage block of 0.012 μ m is ob - tained .

分析了成形制件典型表面直线边和曲线边的表面轮廓算术平均偏差Ra，根据Ra反求出最佳烧结层厚，并进一步给出了CAD模型切片厚度的选取方法。

The slice and sintering thickness are calculated according to Ra . The CAD model slice is presented , and the selecting method of slice thickness is also presented .

算术平均偏差对集料表面纹理的评定是合理有效的；其他条件相同的情况下，粗集料表面纹理的Rα值越大，沥青混合料的高温稳定性、水稳定性和低温抗裂性能越好。

It was reasonable to evaluate aggregates surface texture by arithmetical mean deviation R α; when other factors were fixed , high-temperature stability , moisture stability and low-temperature anti-cracking of asphalt mixtures became better with the augment of arithmetical mean deviation R α .

针对冷轧钢板表面微观轮廓精度的在线测量问题，提出了测量钢板表面粗糙度的2个重要参数轮廓算术平均偏差Ra和每英寸峰值个数PPI的原理和方法。

Taking aim at measuring the precision of surface microcosmic profile of the cold-rolled steel plate , the principle and technique of measuring surface roughness parameters about the profile arithmetic average error R_a and the peaks per inch ( PPI ) were proposed .

（粗糙度）轮廓的算术平均偏差

Arithmetical mean deviation of the ( roughness ) profile

分形指数、表面平均坡度因子和算术平均偏差依次增加，且玄武岩-1的各项纹理指标都大于玄武岩-2。

Fractal index , average surface slope factor and arithmetic mean deviation increase , and the texture of basalt-1 is greater than that of basalt-2 .

经检验，该通用方程的计算值与25种常用流体工质的推荐值的平均绝对偏差为0.5%，算术平均偏差为－0.04%。

This equation was checked against by standard data of 25 working fluids : the equation agrees with the available data with average deviation of - 0.04 % and average absolute deviation of 0.5 % .

通过对集料表面进行镀膜处理，使测量结果反映了集料表面纹理的真实情况，最后分别采用算术平均偏差和平均波长定量评价了集料表面纹理的粗糙度。

When aggregate surfaces were plated by aluminum film , measurement results accorded with real condition of surface texture . Finally , roughness of aggregates surface texture was evaluated quantitatively by arithmetical mean deviation and average wave length respectively .