| 基于二阶循环统计量的近场声全息试验研究 |
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| 引用本文： | 陈志敏,朱海潮,匡贡献.基于二阶循环统计量的近场声全息试验研究[J].振动与冲击,2011,30(9):202-206. |
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| 作者姓名： | 陈志敏 朱海潮 匡贡献 |
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| 作者单位： | 1.海军工程大学 振动与噪声研究所，武汉 430033; 2.总参气象水文局，北京 100081 |
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| 摘 要： | 传统近场声全息技术的重建结果不能准确反映循环平稳声场的调制特性。因此，利用循环自相关函数的解调性能来提取声场的特征循环频率，然后通过循环维纳－辛钦关系来获取循环谱密度，将循环谱密度取代声压谱作为平面近场声全息的声场重建物理量。试验研究表明，此方法可准确提取循环平稳声场的特征频率，重建结果可清晰直观的突出声场的本质特性。
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| 关 键 词： | 循环自相关函数 循环谱密度 特征提取 近场声全息 |
Experimental study on near-field acoustic holography based on the second-order cyclic statistics |
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| CHEN Zhi-min,ZHU Hai-chao,KUANG Gong-xian.Experimental study on near-field acoustic holography based on the second-order cyclic statistics[J].Journal of Vibration and Shock,2011,30(9):202-206. |
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| Authors: | CHEN Zhi-min ZHU Hai-chao KUANG Gong-xian |
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| Affiliation: | 1.Institute of Noise and Vibration, Naval University of Engineering, Wuhan 430033;2.the Meteorological and Hydrographic Bureau, General staff ,Beijing 100081 |
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| Abstract: | The conventional near-field acoustic holography technology can not mirror exactly modulation characteristics of cyclostationary sound field through the reconstructed results.So the demodulation ability of the cyclic autocorrelation function was used to extract the characteristic cyclic frequency.The cyclic spectrum density(CSD) was then obtained through the cyclic Wiener-Khinchin relation,and the CSD was adopted as reconstructed physical quantity in planar near-field acoustic holography instead of the spect... |
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| Keywords: | cyclic autocorrelation function cyclic spectrum density feature extraction near-field acoustic holography |
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