In 2-D wavelet algorithm, the bubble function is constructed, which had the capacity of signal auto-matched, and the threshold from wavelet modulus is given out. The 2-D wavelet algorithm can segment the aim image in fast, the effect is good. 本文提出的二维小波分割算法通过构造出一类Bubble函数,并充分利用Bubble小波本身所具有的信号自适应能力,根据计算出的小波变换模中取阈值,可以直接快速准确地分割出目标图像。
Effect of Bubble Groups on Propagation of Hydroacoustic Signal 水中气泡群对水声信号传播的影响
The bubble cell with 6 fold increase in pathlength provided 6 fold improvement in signal over that of the conventional cylindrical cell. 与普通圆柱形检测池相比,采用泡状池,检测信号可以提高6倍。
The research shows the lyapunov exponent is more sensitive to the phase of bubble, the lager scale of the pressure fluctuation signal. 研究结果表明,最大Lyapunov指数对应的尺度较大,对气泡的行为更为敏感,关联维数和K熵的尺度较小,其变化趋势与乳化相有更好的对应关系。
Make use of the band-pass filter characteristics of HHT, effective filter for bubble flow, slug flow, churn flow and annular flow were achieved. The results show that after filter, signal can keep good local character and nonlinear element. 2. 该滤波方法利用HHT的带通滤波特性,实现对泡状流、弹状流、塞状流、混状流差压信号有效滤波,滤波后可以很好的保留两相流差压信号的非线性特征。