| 基于小波包频带分析技术的水轮机空化特性研究 |
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| 引用本文： | 史会轩,李朝晖,刘媛. 基于小波包频带分析技术的水轮机空化特性研究[J]. 大电机技术, 2009, 0(1) |
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| 作者姓名： | 史会轩 李朝晖 刘媛 |
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| 作者单位： | 1. 华中科技大学,武汉,430074
2. 中国科学院电子学研究所,北京,100080 |
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| 摘 要： | 在详细分析水轮机空化信号特点的基础上,总结了适合于空化信号分析的小波基函数应具有的特点;为避免信号小波包分解的盲目性,文中采用了区间小波包分解方式,即有针对性地对空化信号进行深层次分解.结合水轮机模型空化状态观测结果,对相应状态下监测的空化超声波信号进行小波包时频分布特性和频带能量分布特性分析,得出了水轮机空化超声波时域信号幅值调制特性和频域能量分布随空化系数变化的关系,验证了小波包频带分析技术对水轮机空化信号分析的有效性.
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| 关 键 词： | 水轮机 空化 小波包 区间分解 时频分布 幅值调制 频带能量 |
Investigation on Cavitation Characteristics in Hydraulic Turbines Based on Frequency Bandwidth Analysis of Wavelet Packet |
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| SHI Hui-xuan,LI Zhao-hui,LIU Yuan. Investigation on Cavitation Characteristics in Hydraulic Turbines Based on Frequency Bandwidth Analysis of Wavelet Packet[J]. Large Electric Machine and Hydraulic Turbine, 2009, 0(1) |
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| Authors: | SHI Hui-xuan LI Zhao-hui LIU Yuan |
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| Affiliation: | 1.Huazhong University of Science and Technology;Wuhan 430074;China;2.Institute of Electronics;Chinese Academy of Science;Beijing 100080;China |
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| Abstract: | The characteristics of wavelet basis that is applicable for the processing of cavitation acoustic emission signal are summarized based on the analysis of the characteristics of the acoustic emission signal emitted by cavitation in hydraulic turbines.Besides,local decomposition of wavelet packet are proposed and employed in signal processing to improve the efficiency of decomposition.Aided with the pictures of cavitation,taken in the cavitation tests on the model turbine,with different cavitation coefficient... |
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| Keywords: | hydraulic turbine cavitation wavelet packed local decomposition time-frequency distribution amplitude modulation energy distribution |
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