| 起重机梁活性缺陷的声发射信号特征 |
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| 引用本文： | 李力,陈向前,赵美云,邓代军.起重机梁活性缺陷的声发射信号特征[J].无损检测,2008,30(6). |
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| 作者姓名： | 李力 陈向前 赵美云 邓代军 |
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| 作者单位： | 1. 三峡大学机械与材料学院,湖北宜昌,443002
2. 宜昌市特种设备检验检测所,湖北宜昌,443002 |
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| 基金项目： | 湖北省重点实验室基金
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三峡大学校科研和教改项目 |
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| 摘 要： | 探讨起重机梁缺陷的声发射信号特征和发展规律。采用模拟梁加载试验,获得梁上人工裂纹萌发和扩展过程的声发射信号。通过经验模式分解方法分析出不同载荷和裂纹扩展过程的声发射频率特征。结果表明,起重机梁活性缺陷声发射信号为突发性信号,每一事件声发射所含频率成分复杂。一般裂纹萌发时的声发射信号频率较低;随着裂纹的发展,频率逐渐增高,缺陷频率范围约为25～160 kHz。该研究为起重机械活性缺陷的声发射检测技术提供了理论基础。
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| 关 键 词： | 声发射检测 起重机梁 活性缺陷 信号分析 |
Features of Acoustic Emission Signal of Active Defect in Crane Beam |
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| LI Li,CHEN Xiang-Qian,ZHAO Mei-Yun,DENG Dai-Jun.Features of Acoustic Emission Signal of Active Defect in Crane Beam[J].Nondestructive Testing,2008,30(6). |
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| Authors: | LI Li CHEN Xiang-Qian ZHAO Mei-Yun DENG Dai-Jun |
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| Affiliation: | LI Li CHEN Xiang-Qian ZHAO Mei-Yun DENG Dai-Jun College of Mechanical & Material Engineering; Three Gorges University; Yichang Hubei 443002; China; Department of Special Equipment Test and Examination; China); |
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| Abstract: | The acoustic emission(AE)signal feature and its developing rule for active defect in crane beam was discussed.Based on a testing rig of simulating beam with three artificial cracks,the AE signals were obtained.The signals were collected under different loadings and various moments of crack from beginning to extending.Because of the complexity of the signals,the method of empirical mode decomposition(EMD)was introduced to decompose them.The results demonstrated that the AE signals of active defect were burst... |
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| Keywords: | Acoustic emission testing Crane beam Active defect Signal feature analysis |
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