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Lamb wave propagation in vibrating structures for effective health monitoring

机译：兰姆波在振动结构中的传播以进行有效的健康监测

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Lamb wave based Structural Health Monitoring (SHM) has received much attention during the past decades for its broad coverage and high sensitivity to damage. Lamb waves can be used to locate and quantify damage in static structures successfully. Nonetheless, structures are usually subjected to various external vibrations or oscillations. Not many studies are reported in the literature concerning the damage detecting ability of Lamb wave in oscillating structures which turns out to be a pivotal issue in the practical application of the SHM technique. For this reason in this study, the propagating capability of Lamb waves in a vibrating thin aluminum plate is examined experimentally. Two circular shaped piezoelectric wafer active transducers are surface-bonded on the aluminum plate where one acted as an actuator and another as a sensor. An arbitrary waveform generator is connected to the actuator for the generation of a windowed tone burst on the aluminum plate. An oscilloscope is connected to the sensor for receiving the traveled waves. An external shaker is used to generate out-of-plane external vibration on the plate structure. Time of flight (TOF) is a crucial parameter in most Lamb wave based SHM studies, which measures wave traveling time from the actuator to sensor. In the present study the influence of the external vibrations on the TOF is investigated. Experiments are performed under different boundary conditions of the plate, such as free-free and fixed by gluing. The effects of external vibrations in the frequency range between 10 Hz to 1000 Hz are analyzed. Comparisons are carried out between the resulting Lamb wave signals from the vibrating plate for different boundary conditions. Experimental results show that the external vibrations in relatively low frequency range do not change the TOF during the application of Lamb wave based SHM.
机译：在过去的几十年中，基于羔羊波的结构健康监测（SHM）受到广泛关注，并且对损坏的敏感性很高。兰姆波可用于成功定位和量化静态结构中的损伤。然而，结构通常经受各种外部振动或振荡。关于兰姆波在振动结构中的损伤检测能力的文献报道很少，这在SHM技术的实际应用中是一个关键问题。因此，本实验对兰姆波在振动的薄铝板上的传播能力进行了实验研究。两个圆形的压电晶片有源换能器表面结合在铝板上，其中一个充当致动器，另一个充当传感器。任意波形发生器连接到执行器，以在铝板上产生开窗音。示波器连接到传感器以接收行进的波。外部振动器用于在板结构上产生平面外的外部振动。飞行时间（TOF）是大多数基于Lamb波的SHM研究中的关键参数，它测量从执行器到传感器的波传播时间。在本研究中，研究了外部振动对TOF的影响。实验是在板的不同边界条件下进行的，例如自由-自由和通过粘合固定。分析了在10 Hz至1000 Hz频率范围内的外部振动的影响。在不同的边界条件下，比较了振动板产生的兰姆波信号。实验结果表明，在基于Lamb波的SHM的应用中，较低频率范围内的外部振动不会改变TOF。

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