本文提出了一种基于主轴转速的机床热误差状态方程模型。
This paper presents a state space model based on spindle rotation speed for thermal errors of machine tool.
由于系统方程是时变的，在测量过程中，系统噪声和观测噪声的统计特性等很难精确地估计或测定，事实上很多误差模型都不能简单的设为白噪声。
Because the system equation is changed with time, during the measurement, the statistic character of the system noise and the observation noise cannot be estimated or be determined accurately.
通过计算比较发现，基于PR状态方程的粘度预测模型误差较大，而L BC经验关系能较准确地确定酸性气体的粘度。
Calculation shows that the viscosity model based on pr state equation has big error, while LBC empirical relationship can provide more accurate viscosity of acidic gas.
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