| 近场子空间聚焦的碰摩故障声发射定位方法 |
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| 引用本文： | 李晶,邓艾东,杨勇,赵力,郭如雪.近场子空间聚焦的碰摩故障声发射定位方法[J].声学学报,2017,42(6):703-712. |
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| 作者姓名： | 李晶 邓艾东 杨勇 赵力 郭如雪 |
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| 作者单位： | 1. 东南大学信息科学与工程学院 南京 210096; |
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| 基金项目： | 国家自然科学基金项目(61673108,61375028)和国家工程中心创新能力建设项目(6750100000)资助 |
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| 摘 要： | 针对宽带多源声发射信号的相干、多模态和能量衰减快问题,提出一种近场多重相干信号子空间聚焦的定位算法用于碰摩故障声发射源的定位检测。首先,为滤除干扰模态波、减小频散效应,采用基于模态声发射传播特性分析的小波分解滤波方法,从碰摩初期的声发射信号中获取零阶模态波及波速用于定位计算;其次,为实现信号解相干,提出基于双边相关变换(TCT)的近场聚焦矩阵估计方法;最后,针对声发射信号的能量衰减快问题,利用近场基于特征分解的多重信号分类(N-MUSIC)的空间谱估计方法来实现声源的精确定位。理论分析和实验结果表明:该方法定位精度高、计算复杂度低、稳定性强,能有效识别多个相干碰摩声源。相比传统相干子空间算法(CSM),该方法减少了信号初值和聚焦频点的计算量,对双声源的分辨概率较现有修正近场多重信号分类算法提高了17%,是一种有效的碰摩故障源检测方法。
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| 关 键 词： | 声发射 声学诊断 近场定位 波束形成 |
| 收稿时间： | 2016-03-23 |
Near field signal-subspace focusing model for rub-impact fault localization using acoustic emission data |
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| Affiliation: | 1. School of Information Science and Engineering, Southeast University Nanjing 210096;2. National Engineering Research Center of Turbo-generator Vibration, Southeast University Nanjing 210096;3. School of Resources and Geosciences, China University of Mine and Technology Xuzhou 221008 |
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| Abstract: | In order to solve the fast-fading, coherent and multi-modes characteristics of wide-band acoustic emission(AE), a near field coherent subspace algorithm(N-CSM) for double AE sources in rub-impact fault localization is proposed. Firstly, according to the multi-modes property of material. the zero order mode of AE can be extracted using wavelet decomposition for interference removal and group velocity definition. Then, the two-side correlation transformation(TCT) is applied to automatically focus the covariance matrix on the focus frequency for correlative signals separation. Finally, the near field multiple signal classification algorithm(N-MUSIC) is implemented for double near field AE sources localizations. The results show that the proposed method has strong robustness, high location accuracy,low computational complexity and excellent performance on multiple coherent AE sources detection. Furthermore it can successfully avoid the initial estimation and optimal focus frequency calculation from classical coherent subspace algorithm(CSM). Resolution probability of double AE sources can also be improved 17% than the improved near field multiple signal classification(N-IMUSIC) algorithm. It is an effective way to detect the new rubbing fault position in rotary machine. |
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