在线测量精密机床和加工工件直线度的新方法──优化误差分离法（OEST）

The Optimum EST-A New Method for On-line Measurement of the Straightness of Precision Machine Tools and Machined Workpiece

目前，运用多传感器对工件和精密机床的直线度进行在线测量的方法有ＳＴＰ法、ＳＴＲＰ法和ＦＳＴＰ法等。由于受到传感器相邻间隔距离的限制，这些方法往往只适合于长工件的在线测量。本文推荐的新方法──优化误差分离法（ＯＥＳＴ）可以用于短工件中的测量，它是基于频域分析和时域优化搜索的原理，可以克服频域变换中出现的边缘失效问题以保证频域变换的正确性。本文还介绍了计算机仿真和实际测量实验的结果，并验证了该方法的可行性和正确性。

There are some of multiple-sensor methods used for on-line measurement of the straightness of precision machine tool and machined workpiece. But, all of these methods are only used for long workpiece measurement. The OEST method proposed in this paper is a new one that can be used for short workpiece measurement.It is based on the analysis of frequency domain and optimum search in time domain. It can overcome the mismatch problem in boundary area caused by shift in frequency domain. And,computer simulation and experiment results prove that this method is easy and efficient.