机床误差检测系统的动态不确定度研究

Study of Dynamic Uncertainty in Error Measurement System of Machine Tool

介绍了测量不确定度的定义及内容,借助于灰色系统理论的特点,着重探讨了检测系统的动态不确定度的计算步骤和方法。结合自主研发的数控机床热误差实时补偿检测系统,对车削加工中心热误差进行了测试,通过获得的测试数据来进行动态不确定度分析和研究,最终得出了检测系统的动态不确定度表达式,并与其静态不确定度进行了比较。分析了产生误差原因,通过残差修正进一步提高了动态不确定度的精度。为科学地评价检测系统、提高检测系统的有效性提供了依据。

The definition and content of measurement uncertainty are introduced firstly, the calculating approach of dynamic uncertainty of measurement system is mainly discussed by applying grey system theory. Through the analysis of testing data obtained from the self- developed real - time measurement system of machine tool in the course of measuring thermal error of turning machining center, the expression of dynamic uncertainty of measurement system is put forward. Compared with static uncertainty, the precision of dynamic uncertainty is farther improved through remnant correction. Hence, the importance and usefulness of dynamic uncertainty for scientific judge of measurement system and validity enhancement of measurement system are fully testified.