%0 Journal Article %T Investigation of Macro-instability in a Stirred Vessel Using the Combined Approach of Power Spectral Density and Wavelet Analysis
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 %A JIN Zhe-shan %A LI Zhi-peng %A GAO Zheng-ming %A HE You-jun %A
金哲山 %A 李志鹏 %A 高正明 %A 贺友军 %J 过程工程学报 %D 2007 %I %X 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. %K stirred vessel %K macro-instability %K power spectra/density %K wavelet analysis %K torque %K signal processing
搅拌槽 %K 宏观不稳定 %K 功率谱密度 %K 小波分析 %K 扭矩 %K 信号处理 %K 应用 %K 功率谱密度 %K 小波分析 %K 组合法 %K 研究 %K 搅拌槽 %K 不稳定性 %K Wavelet %K Analysis %K Power %K Spectral %K Density %K Approach %K Combined %K Vessel %K Stirred %K 文献 %K 稳定频率 %K 无因次 %K 宏观不稳定现象 %K 存在 %K 结果 %K 实验数据 %U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=3FCF8B1A330466D5&jid=B9EE12934D19905403D996AE65CEEEED&aid=C60BCA716AE5E407E680A031DF65BA41&yid=A732AF04DDA03BB3&vid=DF92D298D3FF1E6E&iid=0B39A22176CE99FB&sid=6A73B36E85DB0CE9&eid=E2E0FBFE4D7EFB94&journal_id=1009-606X&journal_name=过程工程学报&referenced_num=0&reference_num=17