流变仪测控系统的数据处理方法研究

2022年6月5日21:33:01流变仪测控系统的数据处理方法研究已关闭评论
摘要

吕国芳 常培晶 田正宏
关键词: 相关系数剔除法; 加权最小二乘法; 流变仪; 测控系统; 线性回归; 粗大误差剔除法
中图分类号: TN06?34 ? ? ? ? ? ? ? ? ? ? ?

吕国芳 常培晶 田正宏
关键词: 相关系数剔除法; 加权最小二乘法; 流变仪; 测控系统; 线性回归; 粗大误差剔除法
中图分类号: TN06?34 ? ? ? ? ? ? ? ? ? ? ? ? 文献标识码: A ? ? ? ? ? ? ? ? ? ? ? ? ? 文章编号: 1004?373X(2019)03?0173?04
Abstract: The rheological parameters are obtained by means of linear regression of torque values in the rheological measurement and control system. Since the slope and intercept obtained by linear regression has poor tolerance for external disturbances, the correlation coefficient elimination method is proposed. This method can restrain the external interference according to the correlation coefficient of linear regression. The weighted least square method is used for linear regression. The result of field test is used to evaluate the effect of data processing. The result shows that the correlation coefficient elimination method can improve the correlation coefficients of linear regression obviously, and the rheological parameters obtained by weighted least square method are more stable than those of ordinary least square method.
Keywords: correlation coefficient elimination method; weighted least square method; rheometer; measurement and control system; linear regression; coarse error elimination method



4 ?結 ?语
本文首先采用拉依达准则对采集到的原始扭矩值[Mi,k]进行粗大误差处理,抑制震动产生的影响;然后利用均值法抑制电磁干扰白噪音,获得[Mi];再采用相关系数剔除法对剪切应力[τi]和剪切速率[γ′i]进行异常点剔除,抑制由于混凝土不均匀导致的影响;最后根据绝对残差倒数作为权重系数[wi]进行加权最小二乘法线性回归,得到屈服应力[τ0]和塑性粘度[η],增加了流变参数的稳定性。
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