Energy Characterization of Bolt Tightening Force Based on Wavelet Packet Decomposition
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摘要: 螺栓是基础设施结构连接的重要构件，其可靠性是结构整体安全性的保证，故对结构的螺栓连接状况进行监测具有重要意义。螺栓松动和预紧力退化是螺栓常见的两种损伤类型。超声导波具有对微损伤敏感和能量衰减小等优点而被广泛应用于无损检测领域。以超声导波为检测手段，通过小波包分解提取后，各级信号的能量指标对螺栓群中的螺栓预紧力进行表征，并通过试验对该方法的可行性进行了验证。Abstract: Bolt as an important connection component of the infrastructure structure, its reliability influences the security of overall structure, so it is necessary to monitor the health of the bolt connection. Bolt looseness and preload degeneration are the most common types of damage to bolts. Due to the advantages of being sensitive to micro-damage and small energy attenuation with long propagation in the structure, the ultrasonic guided wave was widely used to evaluate the health state of structure. In this paper, ultrasonic guided wave was used as a damage detection method and the bolt pre-tightening force was characterized by the energy index of signals obtained from wavelet packet decomposition and the feasibility was verified by experiment.
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Keywords:
- ultrasonic guided wave /
- bolt /
- wavelet packet decomposition /
- energy
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