基于最小二乘支持向量机的热电偶非线性辨识研究

Nonlinear Identification of Thermocouple Based on LS-SVM

热电偶的电动势和温度之间的函数关系是一种非线性关系。对热电偶进行精确的非线性辨识是提高温度测试精度的关键。采用最小二乘支持向量机方法解决热电偶的非线性辨识问题,可以实现热电偶电动势和温度之间的高精度辨识。该方法采用LS-SVM构建逆模型,并通过该模型映射热电偶的非线性特性。通过K型热电偶的非线性辨识实验结果表明:所提出的LS-SVM模型能很好地拟合热电偶的非线性特征,辨识精度高,误差在0.3℃以内。

The function relationship between the thermocouple voltage and the temperature is a kind of nonlinear phenomenon.To improve the temperature measurement precision,the nonlinear identification is important.The LS-SVM method is put up to solve the nonlinear identification of the thermocouple.It uses the LS-SVM to build the reverse model,the nonlinear features of the thermocoupe are mapped by this model.