Abstract：Experiments were carried out in a flat-bottom cylindrical stirred tank with 0.476 m in diameter. The digital-signal processing approaches for macro-instability were analyzed and the combined approach of power spectral density and wavelet analysis was proved to be suitable for analyzing one-dimensional low-frequency signal with noise and peak value. The torque of the impeller was measured by torque transducer and analyzed by using the combined approach. The results show that there are macro-instabilities in the stirred vessel. The dimensionless macro-instability frequency (f/N) obtained by the combined approach was in good agreement with those from the literature. The combined approach of power spectral density and wavelet analysis was proved to be a useful tool for the investigation of macro-instability phenomenon.
金哲山;李志鹏;高正明;贺友军. 应用功率谱密度与小波分析组合法研究搅拌槽内宏观不稳定性[J]. , 2007, 7(2): 241-245.
JIN Zhe-shan;LI Zhi-peng;GAO Zheng-ming;HE You-jun. Investigation of Macro-instability in a Stirred Vessel Using the Combined Approach of Power Spectral Density and Wavelet Analysis. , 2007, 7(2): 241-245.
2007, Vol. 7 
