| 彭新民,郭航忠,张蕊.水流脉动压力的小波分析研究[J].水利学报,2003,34(8): |
| 水流脉动压力的小波分析研究 |
| Wavelet analysis on flow fluctuating pressure acting on plunge pool slope |
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| DOI： |
| 中文关键词: 小波分析 小波包分析 脉动压力 方差 相关分析 |
| 英文关键词: wavelet analysis wavelet packet analysis fluctuating pressure mean square deviation correlation analysis |
| 基金项目: |
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| 中文摘要: |
| 利用小波分析对试验所测得的水垫塘边坡脉动压力信号进行小波包的完全分解。对分解所得的各个频段的信号的方差进行统计分析。结果表明，分解前后信号的能量是守恒的，脉动能集中在低频段，其分布规律与用傅里叶变换计算的功率谱一致。水垫塘较低高程处脉动压力具有较大的能量，该处旋涡的尺寸相对较大，测点间存在较大的相关性；在较高处测点间相关性不大，旋涡尺寸相对较小。 |
| 英文摘要: |
| Wavelet analysis method is applied to wave packet analysis of flow fluctuating pressure on plunge pool slope measured in model test. The mean square deviations of the decomposed signals are calculated. It is found that the energy of the ori
ginal signal is equal to that of the decomposed signals and the energy is concentrated in the low frequency region. The law of energy distribution is the same as the power spectrum derived by Fourier transform. The fluctuation pressure at lower elevation of plunge pool possesses greater energy and the scales of flow eddies are relatively larger. Correspondingly, the correlations between measuring points are strong. Whereas, the correlations at the higher elevation are weak which implies that the scales of flow eddies are relatively smaller. |
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