Lamb波与瞬时相位技术在损伤识别中的应用

采用主动Lamb监测技术与瞬时相位相结合的方法对复合材料板进行健康监测。首先通过仿真试验,模拟损伤信号在正常信号中的叠加,结果表明其会引起瞬时相位曲线相应的变化;然后再利用Lamb波主动监测技术,在复合材料板上进行试验采集信号,其瞬时相位能够发现板结构中的损伤,说明瞬时相位可应用于结构的损伤识别。

Damage Detection Based on Technology of Lamb Wave and Instantaneous Phase

Instantaneous features of signal can be used to identify the signal. A damage detection method for composite material is presented that uses instantane ous phase and an active monitoring method using Lamb wave. This paper firstly im itated a signal composed of normal and damage signals. Its instantaneous phase c hanges with damage emission. In succession, an experiment is conducted to get a series of signals before and after damage from the composite material by the act ive monitoring based on Lamb wave. The instantaneous phase changes when the comp osite material is damaged. The experimental results show that the instantaneous phase avails to structural health monitoring.