| 基于传递阻抗能量的无基准Lamb波裂纹检测 |
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| 引用本文： | 何志全, 周丽, 孙虎. 基于传递阻抗能量的无基准Lamb波裂纹检测[J]. 工程力学, 2014, 31(7): 250-256. DOI: 10.6052/j.issn.1000-4750.2013.01.0113 |
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| 作者姓名： | 何志全 周丽 孙虎 |
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| 作者单位： | 南京航空航天大学机械结构力学及控制国家重点实验室,南京 210016 |
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| 基金项目： | 国家自然科学基金项目(11172128);国家自然科学基金国际(地区)合作与交流项目(61161120323);高等学校博士学科点专项科研基金项目(20123218110001);江苏省“六大人才高峰”项目(2010-JZ-004);江苏高校优势学科建设工程项目 |
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| 摘 要： | 该文提出了一种获取压电陶瓷(PZT)传感器间Lamb波传递阻抗的方法,以实现对板结构裂纹的无基准快速检测。该方法从两组并排的PZT元件间提取包含Lamb波转换模式的损伤特征信号,对特征信号进行分类并求出其传递阻抗,通过比较传递阻抗的能量差异来判断裂纹是否存在。首先通过有限元仿真研究了裂纹导致的Lamb波模式转换现象以及PZT极化特性对各模式之间相对相位的影响,分析了所提出的方法的可行性；进一步通过在铝板上的实验验证了该方法的有效性。研究表明该文所提出的方法无需选择最优的激励频率和采样时间即可实现对裂纹的快速检测,具有较强的鲁棒性和适用性。
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| 关 键 词： | 结构健康监测 Lamb波 模式转换 传递阻抗 无基准 裂纹检测 |
| 收稿时间： | 2013-01-31 |
| 修稿时间： | 2013-05-09 |
REFERENCE-FREE LAMB WAVE CRACK DETECTION BASED ON TRANSFER IMPEDANCE ENERGY |
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| HE Zhi-quan, ZHOU Li, SUN Hu. REFERENCE-FREE LAMB WAVE CRACK DETECTION BASED ON TRANSFER IMPEDANCE ENERGY[J]. Engineering Mechanics, 2014, 31(7): 250-256. DOI: 10.6052/j.issn.1000-4750.2013.01.0113 |
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| Authors: | HE Zhi-quan ZHOU Li SUN Hu |
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| Affiliation: | State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China |
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| Abstract: | To detect cracks in plate-like structures without any baseline data, a method to obtain Lamb wave transfer impedance from piezoelectric transducers (PZT) was proposed. First, the damage feature signals which contained converted Lamb wave modes were extracted and classified from two sets of parallel PZT components. Subsequently, transfer impedances of the feature signals were obtained in the frequency domain, and the existence of cracks was determined by comparing the energy associated with the transfer impedances. To analyze the applicability of the proposed method, crack-induced Lamb wave mode conversion and effects of PZT polarization characteristics on the relative phase among each mode were studied using the finite element method (FEM). Further, experiments on aluminum plates verified the effectiveness of this method. This research shows that the proposed crack detection method has strong robustness and applicability, as it is not sensitive to the optimal excitation frequency and the sampling time of signals. |
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| Keywords: | structural health monitoring Lamb wave mode conversion transfer impedance reference-free crack detection |
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