冷辗工艺广泛应用于环件的加工，在冷辗环数值模拟与优化过程中，圆度是重要的目标设计变量。
Cold rolling technology is applied to ring parts extensively. In the process of numerical simulation and optimization of cold rolling, roundness is a key object variable of the design.
本文应用谐波分析法分析了圆度误差，提出了一种圆度误差的简便分析方法，最后讨论了快速富里叶变换的应用。
Using harmonic analysis, the roundness error is analysed. A handy analytical method of roundness error is presented. Then the application of FFT is discussed.
该方法不仅能全面地获取钢管的质量参数，而且还可以做到实时成像在线圆度检测，具有重大的实际意义和广阔的应用前景。
The method can not only inspect the quality parameters of steel tube, but also work online. So it has great actual significance and wide application prospect.
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