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| 噪声环境下基于小波熵的声发射识别 | |
| 引用本文： | 邓艾东,赵力,包永强,高亹.噪声环境下基于小波熵的声发射识别[J].东南大学学报(自然科学版),2009,39(6). |
| 作者姓名： | 邓艾东 赵力 包永强 高亹 |
| 作者单位： | 1. 东南大学火电机组振动国家工程研究中心,南京,210096 2. 东南大学信息科学与工程学院,南京,210096 3. 南京工程学院通信工程学院,南京,210067 |
| 基金项目： | 国家高技术研究发展计划(863计划)资助项目，国家自然科学基金资助项目，东南大学科学基金资助项目 |
| 摘 要： | 针对声发射技术在旋转机械故障检测中的强噪声干扰问题,提出了一种基于小波熵的声发射检测算法.该算法首先给定一个合理的阈值.对声发射信号进行小波分解.然后进行分帧处理,使信号在较短的时间间隔内保持特性基本不变,从而求出每一帧信号的小波熵.通过比较每一帧信号的小波熵值与阈值的大小,判断该信号为声发射帧还是噪声帧.为了检验算法的检测效果,在转子实验台上获得碰摩声发射信号.并在测试数据上叠加不同信噪比的高斯白噪声和非平稳噪声,进行声发射识别.实验结果表明:该算法具有较高的识别正确率;在低信噪比环境下,通过调整阈值的可调参数可以有效提高识别的正确率. |
| 关 键 词： | 声发射 小波熵 识别 |
Recognition of acoustic emission based on wavelet entropy in noisy condition |
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| Deng Aidong Zhao Li Bao Yongqiang Gao Wei.Recognition of acoustic emission based on wavelet entropy in noisy condition[J].Journal of Southeast University(Natural Science Edition),2009,39(6). | |
| Authors: | Deng Aidong Zhao Li Bao Yongqiang Gao Wei |
| Institution: | Deng Aidong1 Zhao Li2 Bao Yongqiang3 Gao Wei1(1National Engineering Research Center of Turbo-generator Vibration,Southeast University,Nanjing 210096,China)(2School of Information Science , Engineering,China)(3School of Communication Engineering,Nanjing Institute of Technology,Nanjing 210067,China) |
| Abstract: | In acoustic emission(AE) technique,to avoid the serious noise disturbance in the fault diagnosis of rotary machine,a recognition algorithm based on wavelet entropy(WE) is proposed.First,through setting up an appropriate threshold,an AE signal is decomposed by wavelet transform.Secondly,the AE signal is divided into some equal frames to keep the characteristic approximately constant in a short time interval,and the WE of each frame can be calculated.Thirdly,through comparing the value of each WE with the thr... |
| Keywords: | acoustic emission wavelet entropy recognition |
| 本文献已被 CNKI 万方数据 等数据库收录！ | |