High Precise Internal Friction Calculation for Force Vibration Mode
LIANG Li-Min, FEI Guang-Tao, SHUI Jia-Peng, CUI Ping, WU Bing, CHEN Xiao-Ming, LUI Ke-Tao
Key Laboratory of Materials Physics, Institute of Solid State Physics, Hefei Institutes of Physical Science,
Chinese Academy of Sciences, PO Box 1129, Hefei 230031
High Precise Internal Friction Calculation for Force Vibration Mode
Key Laboratory of Materials Physics, Institute of Solid State Physics, Hefei Institutes of Physical Science,
Chinese Academy of Sciences, PO Box 1129, Hefei 230031
Abstract： For the necessity of measuring the small phase difference of internal friction, a detailed comparison is carried out among the fast Fourier transformation (FFT), correlation function and three-parameter sine wave curve-fit methods. The comparison shows that the three-parameter sine wave curve-fit method can obtain more precise phase angle difference than correlation methods. Compared with the FFT algorithm, the three-parameter sine wave curve-fit method can obtain more precise frequency values.
2005, Vol. 22 
