| 基于Lamb波频散特性的薄板声发射源定位方法研究 |
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| 引用本文： | 樊保圣,闫小青,扶名福,谢志龙,余丽.基于Lamb波频散特性的薄板声发射源定位方法研究[J].固体力学学报,2011(Z1). |
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| 作者姓名： | 樊保圣 闫小青 扶名福 谢志龙 余丽 |
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| 作者单位： | 南昌大学建筑工程学院;南昌工程学院; |
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| 基金项目： | 江西省自然科学基金(2009GZC0083)资助 |
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| 摘 要： | 声发射源时差定位方法中波速的确定是定位准确的关键问题,根据模态声发射理论,声发射信号在薄板内的传播过程中具有频散现象和多模态特性.不同频率不同模态的声波其传播速度不同.基于Lamb波频散特性和声发射检测技术,采取时频联合分析方法对铝薄板中声波模式进行识别;利用低频段频散不明显的扩展波的波速和同一频率同一模态波到达两传感器的时间差来实现声发射源的准确定位;通过铝薄板中AE源定位实验表明,采用S0模式,即扩展波的波速进行定位计算,可以比较准确地确定声发射源的位置,而且理论值与实际值相差很小.
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| 关 键 词： | Lamb波 声发射 模态 源定位 |
THE RESEARCH ON LOCATING METHOD OF ACOUSTIC EMISSION SOURCE BASED ON THE DISPERSIVE CHARACTERISTICS OF LAME WAVE IN SHEET |
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| Baosheng Fan Xiaoqing Yan Mingfu Fu Zhilong Xie Li Yu.THE RESEARCH ON LOCATING METHOD OF ACOUSTIC EMISSION SOURCE BASED ON THE DISPERSIVE CHARACTERISTICS OF LAME WAVE IN SHEET[J].Acta Mechnica Solida Sinica,2011(Z1). |
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| Authors: | Baosheng Fan Xiaoqing Yan Mingfu Fu Zhilong Xie Li Yu |
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| Institution: | Baosheng Fan1 Xiaoqing Yan1 Mingfu Fu2 Zhilong Xie1 Li Yu1(1School of Civil Engineering and Architecture,Nanchang University,Nanchang,330031,China)(2Nanchang Institute of Technology,330099,China) |
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| Abstract: | In the acoustic source time difference location,the most important is determine the wave speed.Based on the theory of modal acoustic enission,it is believed that the acoustic emission signal propagation in the structure has the characteristics of multi-mode and dispersion.The wave with different frequency and modes have different speeds.Time-frequency analysis was employed to recognize the lamb wave modes based on dispersion characterisitcs of Lamb wave and acoustic emissions technique.The accuracy AE sourc... |
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| Keywords: | Lamb wave acoustic emissions modal shape source location |
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