基于SVM的电子分析天平温度漂移补偿方法

电磁力平衡传感器等关键部件的温敏特性是引起电子分析天平温度漂移的主要因素。针对电子分析天平温度漂移问题提出了基于支持向量机的补偿方法。通过分析引起电子分析天平温度漂移误差的原因,将温度敏感部件的温升和电子分析天平的温度漂移数据作为模型输入,运用自适应参数优化方法寻找最优参数,建立电子分析天平温度漂移误差模型并进行温度漂移补偿。通过对量程200g、分辨力0.1mg的电子分析天平进行补偿检验,结果表明全量程内的示值误差绝对值≤0.3mg,优于国家标准GB/T 26497-2011《电子天平》规定的I级天平对温度漂移指标的要求。

Temperature Drift Compensation Method for Electronic Analytical Balance Based on Support Vector Machine

The temperature sensitivity of the key components such as the electromagnetic force compensation cell is the main factor causing the temperature drift in the electronic analytical balance. In order to eliminate the error caused by the temperature drift, a model and compensation method for electronic analytical balance were proposed based on the support vector machine. Through analyzing the factors of the temperature drift, the temperature rise of the temperature sensitive element and the temperature drift data of the electronic analytical balance were taken as the inputs of the model, the adaptive parameter optimization method was used to search the optimal parameter, the temperature drift error model of electronic analytical balance was established and the temperature drift compensation was performed. The test results demonstrate that the absolute value of the full load indication error of electronic analytical balance, of which the range is 200g and the resolution is 0.1mg, not more than 0.3mg, that the indication error caused by temperature drift is superior to the impact index of the 1st class balance defined by Chinese National Standard GB/T 26497-2011 “Electronic balance”.