文档介绍：撞击流反应器流场速度时间序列的结
构复杂性研究*
张建伟
宋艳芳
(沈阳化工大学机械工程学院
沈阳 110142)
摘要:结合谱熵和小波熵算法,从整体及各个尺度上,对撞击流反应器(Impinging stream mixer, ISM)流场速度时间序列进行
结构复杂性分析。谱熵算法描述时间序列信号的谱的结构情况,反映序列频率谱的集中程度,从而体现 ISM 流场速度信号
的总体的平均功率的分布情况;小波熵算法充分利用小波变换的多分辨、多尺度特性,使信号在结构上的复杂性得以清晰体
现。研究表明,尺度 a4 上的小波熵分布与系统的结构复杂性的分布类似,说明该系统的信号的主要特征集中在低频细节成
分 a4 尺度上。不同尺度下的小波熵表征信号在各个频段的变化趋势,体现信号在时域和频域上的信息。该系统的轴向流体
结构复杂性大小沿轴线没有特定的变化规律,但径向流体结构复杂性大小呈对称分布,且在轴心取得最大值。
关键词:撞击流结构复杂性谱熵小波熵
中图分类号:TQ52
plexity Study for the Velocity Time Series in Impinging
Stream Mixer
ZHANG Jianwei SONG Yanfang
(School of Mechanical Engineering, Shenyang University of Chemical Technology, Shenyang 110142)
Abstract: plexity was first to use for the velocity time series in the field of Impinging Stream Mixer from the whole to
each scale, combining spectral entropy with wavelet entropy algorithm. Spectral entropy algorithm depicts the structure of spectrum
in the time series signal , reflecting the sequence of concentration of the frequency spectrum, which reflects the distribution of the
overall average power for signal in ISM . To reflect plexity of the signal in structure clearly, we take full advantage of the
multi­resolution, multi­scale features of the wavelet transform. The results indicated that the distribution of a4­scale wavelet
entropy and the distribution of plexity have similar structure, which indicates that the mai