| 基于小波变换的岩石声发射信号互相关分析及时延估计 |
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| 引用本文： | 康玉梅,朱万成,陈耕野,尹筱琴. 基于小波变换的岩石声发射信号互相关分析及时延估计[J]. 岩土力学, 2011, 32(7): 2079-2084 |
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| 作者姓名： | 康玉梅 朱万成 陈耕野 尹筱琴 |
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| 作者单位： | 东北大学 资源与土木工程学院，沈阳 110004 |
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| 基金项目： | 国家自然科学基金，国家重点基础研究发展计划(973计划)项目，中央高校基本科研业务费资助，霍英东教育基金会资助 |
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| 摘 要： | 声发射全波形采集为基于波形分析的声源定位方法提供了可能。声发射源定位方法中最常用的是时差定位方法，因此，时差获取精确与否直接影响定位的精度。借助于小波变换和互相关技术研究声发射信号的时延估计，首先利用小波分析技术对信号进行分解，确定有意义信号的频带宽度，再提取分解后的相应频带的小波系数，利用互相关技术计算出该频带信号到达各传感器的时差，进而利用时差定位法反演声发射源，实现了声发射源更精确的定位。经声发射监测验证结果表明，该时延估计方法能有效地减小声发射源定位的误差，提高声发射源的定位精度，为准确反演声发射源提供了一种有效途径。
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| 关 键 词： | 小波变换 声发射 互相关技术 时延估计 源定位 |
| 收稿时间： | 2011-09-26 |
Cross correlation analysis and time delay estimation of acoustic emission signals of rock based on wavelet transform |
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| KANG Yu-mei,ZHU Wan-cheng,CHEN Geng-ye,YIN Xiao-qin. Cross correlation analysis and time delay estimation of acoustic emission signals of rock based on wavelet transform[J]. Rock and Soil Mechanics, 2011, 32(7): 2079-2084 |
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| Authors: | KANG Yu-mei ZHU Wan-cheng CHEN Geng-ye YIN Xiao-qin |
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| Affiliation: | College of Resources and Civil Engineering, Northeastern University, Shenyang 110004, China |
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| Abstract: | The full wave form acquisition of acoustic emission(AE) signal provides the possibility of source location based on waveform analysis.The time differences between several sensors are commonly used for AE source location;and the accuracy of time differences has a direct influence on the location accuracy.Based on the wavelet transform cross correlation,the time delay estimation of AE signal is studied.Firstly,through wavelet analysis,signals are decomposed into a series of time-domain signals,each of which c... |
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| Keywords: | wavelet transform acoustic emission(AE) cross correlation technique time delay estimation source location |
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