【作者】 王彤； 刘相华； 王国栋； 邹天来； 李洪斌；

【Author】 WANG Tong LIU Xianghua WANG Guo dong (Northeastern University)ZOU Tianlai LI Hongbin(Benxi Iron and Steel (Group )Co)

【机构】 东北大学； 本溪钢铁(集团)公司；

【摘要】 提出了一种改进的快速付立叶变换(MFFT)的计算方法,在采样的持续时间不是信号周期整数倍的条件下,能够准确地提供此信号中各周期分量的特性。对比这种算法和普通FFT,分析了影响热轧带钢厚度的轧辊偏心,结果表明,MFFT方法计算的频谱泄漏少,主要分量幅值增大,计算精度大幅提高。更多还原

【Abstract】 Anew approach, named Modified Fast Fourier Transform (MFFT ), is proposed to analyze the components of a periodic signal when sampling duration is not equal to an integer multiple of the fundamentals. The effect of roll eccentricities on hot strip thickness accuracy is analyzed through comparing between this approach and normal FET. The result shows the leakage of the frequency spectrum calculated by MFFT is reduced, the amplitudes of main components increased, and the calculation accuracy is increased significantly.更多还原