Ziaja Dominika, Jurek Michał
Department of Structural Mechanics, Rzeszow University of Technology, ul. Poznańska 2, 35-084 Rzeszów, Poland.
Materials (Basel). 2024 May 6;17(9):2160. doi: 10.3390/ma17092160.
In this article, the practical issues connected with guided wave measurement are studied: (1) the influence of gluing of PZT plate actuators (NAC2013) on generated elastic wave propagation, (2) the repeatability of PZT transducers attachment, and (3) the assessment of the possibility of comparing the results of Laser Doppler Vibrometry (LDV) measurement performed on different 2D samples. The consideration of these questions is crucial in the context of the assessment of the possibility of the application of the guided wave phenomenon to structural health-monitoring systems, e.g., in civil engineering. In the examination, laboratory tests on the web of steel I-section specimens were conducted. The size and shape of the specimens were developed in such a way that they were similar to the elements typically used in civil engineering structures. It was proved that the highest amplitude of the generated wave was obtained when the exciters were glued using wax. The repeatability and durability of this connection type were the weakest. Due to this reason, it was not suitable for practical use outside the laboratory. The permanent glue application gave a stable connection between the exciter and the specimen, but the generated signal had the lowest amplitude. In the paper, the new procedure dedicated to objective analysis and comparison of the elastic waves propagating on the surface of different specimens was proposed. In this procedure, the genetic algorithms help with the determination of a new coordinate system, in which the assessment of the quality of wave propagation in different directions is possible.
（1）PZT 板状致动器（NAC2013）的粘贴对所产生弹性波传播的影响；（2）PZT 换能器附着的可重复性；（3）评估对不同二维样本进行激光多普勒振动测量（LDV）结果进行比较的可能性。在评估将导波现象应用于结构健康监测系统（如土木工程领域）的可能性时，考虑这些问题至关重要。在实验中，对工字钢试件的腹板进行了实验室测试。试件的尺寸和形状设计得与土木工程结构中常用的构件相似。结果表明，使用蜡粘贴激励器时，所产生波的振幅最高。这种连接方式的可重复性和耐久性最差。因此，它不适合在实验室外实际使用。使用永久性胶水能使激励器与试件之间形成稳定连接，但所产生信号的振幅最低。本文提出了一种专门用于客观分析和比较在不同试件表面传播的弹性波的新方法。在该方法中，遗传算法有助于确定一个新的坐标系，在这个坐标系中可以评估不同方向上波传播的质量。
