Preload Monitoring of Bolted L-Shaped Lap Joints Using Virtual Time Reversal Method.
Preload Monitoring of Bolted L-Shaped Lap Joints Using Virtual Time Reversal Method.
复制标题
使用虚拟时间反转法监测螺栓 L 形搭接接头的预紧力
DOI：
10.3390/s18061928
复制
发表时间：
2018-06-13
期刊：
影响因子：
--
通讯作者：
Zhang J
中科院分区：
文献类型：
--
作者：
Du F;Xu C;Wu G;Zhang J
l型螺栓搭接常用于航空航天和民用结构。然而，螺栓连接经常发生松动，这对这些结构的安全性和可靠性产生了重大影响。因此，螺栓预紧力监测非常重要，特别是在松动初期。本文提出了一种虚拟时间反转导波法，用于精确、简便地监测螺栓l型搭接预紧力。该方法从螺栓结构完全紧固状态下提取参考重发射信号（RRS）。然后将RRS作为螺栓结构松动状态下的激励信号，将重聚焦波包的归一化峰值幅值作为螺栓结构的紧度指数（TIA）。通过单螺栓和多螺栓的l型螺栓连接实验验证了该方法的有效性。此外，还讨论了导波频率和密性指标的选择。结果表明，锚杆预紧力与锚杆静力强度呈线性关系。与时间反转（TR）方法相比，检测灵敏度显著提高，特别是在螺栓松动处于萌芽阶段时。结果还表明，TR法是一种检测螺栓松动数量的有效方法。
L-shaped bolt lap joints are commonly used in aerospace and civil structures. However, bolt joints are frequently subjected to loosening, and this has a significant effect on the safety and reliability of these structures. Therefore, bolt preload monitoring is very important, especially at the early stage of loosening. In this paper, a virtual time reversal guided wave method is presented to monitor preload of bolted L-shaped lap joints accurately and simply. In this method, a referenced reemitting signal (RRS) is extracted from the bolted structure in fully tightened condition. Then the RRS is utilized as the excitation signal for the bolted structure in loosening states, and the normalized peak amplitude of refocused wave packet is used as the tightness index (TIA). The proposed method is experimentally validated by L-shaped bolt joints with single and multiple bolts. Moreover, the selections of guided wave frequency and tightness index are also discussed. The results demonstrate that the relationship between TIA and bolt preload is linear. The detection sensitivity is improved significantly compared with time reversal (TR) method, particularly when bolt loosening is at its embryo stage. The results also show that TR method is an effective method for detection of the number of loosening bolts.
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