| 腐蚀声发射信号降噪方法 |
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| 引用本文： | 于洋,张雯雯,杨平,傅元,席剑辉. 腐蚀声发射信号降噪方法[J]. 声学学报, 2014, 39(3): 372-379. DOI: 10.15949/j.cnki.0371-0025.2014.03.008 |
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| 作者姓名： | 于洋 张雯雯 杨平 傅元 席剑辉 |
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| 作者单位： | 1. 沈阳工业大学信息科学与工程学院 沈阳 110870; |
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| 基金项目： | 辽宁省教育厅创新团队项目(LT2010082)资助 |
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| 摘 要： | 为了从复杂背景噪声中有效地检测出腐蚀声发射信号,采用短时分形维数和离散分数余弦变换相结合的降噪方法,利用声发射检测系统,对6% FeCl3·6H2O溶液中Q235钢板的全面腐蚀和局部腐蚀声发射信号进行了降噪处理。实验结果表明,腐蚀声发射信号分别加入白噪声、有色噪声和粉红噪声,在输入信噪比为0~15dB的条件下,此方法降噪效果与标准离散余弦、离散分数余弦变换方法相比,输出信噪比最高可提升8 dB。所述降噪方法对检测腐蚀声发射信号以及对金属剩余寿命的评价具有一定意义。
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| 关 键 词： | 声发射信号 降噪方法 粉红噪声 分形维数 降噪处理 降噪效果 变换方法 剩余寿命 局部腐蚀 背景噪声 |
| 收稿时间： | 2013-01-22 |
Noise reduction method of corrosion acoustic emission signal |
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| Affiliation: | 1. Shenyang University of Technology, School of Information Science and Engineering Shenyang 110870;2. Liaoning Jidian Polytechnic Dandong 118009;3. Shenyang Aerospace University School of Automation Shenyang 110136 |
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| Abstract: | The general corrosion and local corrosion of Q235 steel was tested by acoustic emission detecting system under 6%FeCl3-6H2O solution to effectively detect the corrosion acoustic emission signal from complex background noise.The short-time fractal dimension and discrete fractional cosine transform methods are combined to reduce noise.The input SNR is 0~15 dB while corrosion acoustic emission signals being added with white noise,color noise and pink noise respectively.The results show that the output signal-to-noise ratio is improved by up to 8 dB compared with discrete cosine transform and discrete fractional cosine transform.The above-mentioned noise reduction method is of significance for the identification of corrosion induced acoustic emission signals and the evaluation of the metal remaining life. |
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