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论文:2013,Vol:31,Issue(4):602-606 |
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引用本文： |
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胡海豹, 杜鹏, 宋东, 郭云鹤, 王鹰. 壁湍流猝发事件检测与提取方法研究[J]. 西北工业大学 |
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Hu Haibao, Du Peng, Song Dong, Guo Yunhe, Wang Ying. Extracting Accurately and Efficiently Burst Events of Wall Turbulence[J]. Northwestern polytechnical university |
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| 壁湍流猝发事件检测与提取方法研究 |
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| 胡海豹, 杜鹏, 宋东, 郭云鹤, 王鹰 |
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| 西北工业大学 航海学院, 陕西 西安 710072 |
| 摘要: |
| 在重力式低速水洞中完成了湍流边界层流场测量,并分别利用自相关方法和小波分析方法,对对数律区中一测点处的速度信号进行了分析。结果表明,自相关方法对于平均猝发周期的检测精度较高;小波分析方法可用于猝发事件的提取,但对平均猝发周期的检测精度较低。为此,进一步提出了一种同时基于自相关方法和小波分析方法的壁湍流猝发事件快速检测与提取方法,并总结了该方法的具体实施步骤。与原方法相比,该方法既能够精确检测湍流平均猝发周期,又能够提高猝发事件的提取精度。 |
| 关键词:
自相关
边界层
效率
流场
测量
信号重构
湍流
小波变换
猝发事件
检测
提取
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| Extracting Accurately and Efficiently Burst Events of Wall Turbulence |
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| Hu Haibao, Du Peng, Song Dong, Guo Yunhe, Wang Ying |
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| College of Marine Engineering, Northwestern Polytechnical University, Xi'an 710072, China |
| Abstract: |
| Flow field measurement of turbulent boundary layer was accomplished in a gravitational low-speed water tunnel set up by us.The velocity signal of a test point in logarithmic layer is analyzed respectively with two methods (autocorrelation method and wavelet transform method), and the results and their analysis demonstrate preliminari-ly that the autocorrelation method has high precision for the detection of average burst period, while the wavelet transform method can be used to extract burst events but with low precision.Consequently, an improved method with high precision and efficiency is put forward based both on autocorrelation and wavelet transform, and the spe-cific implementation steps are summarized in section 3 of the full paper.Compared with old methods, our improved method can indeed extract burst events of wall turbulence both accurately and efficiently. |
| Key words:
autocorrelation
boundary layers
efficiency
flow fields
measurements
signal reconstruction
turbulence
velocity
wawelet transforms
burst events
detection
extraction
wall turbulence
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| 收稿日期: 2012-11-10
修回日期:
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| DOI: |
| 基金项目: 国家自然科学基金(51109178);陕西省自然科学基础研究计划项目(2010JQ1009);高等学校博士学科点专项科研基金资助 |
| 通讯作者:
Email： |
| 作者简介: 胡海豹(1979-),西北工业大学副教授、博士,主要从事水动力学测试与仿真、水下减阻技术等研究。
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| 作者相关文章 |
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| 胡海豹 在本刊中的所有文章 |
| 杜鹏 在本刊中的所有文章 |
| 宋东 在本刊中的所有文章 |
| 郭云鹤 在本刊中的所有文章 |
| 王鹰 在本刊中的所有文章 |
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参考文献: |
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