Engineers and researchers, especially in fields of aerospace and offshore oil, have begun to use vibration-based methods from the late 1970s and early 1980s. Īmong these detection methods, vibration-based methods have attracted much attention. Over last few decades, some techniques such as wave propagation, impedance change and ultrasonic inspection have been employed, and various methods have been proposed for the damage detection. Thus finding these damages via nondestructive techniques at the earliest possible stage is very important. If these damages cannot be found as soon as possible, they will cause the structure to work ineffectively and may lead to a disaster. During their service life cycles, they may be damaged due to the adverse impact of environmental factors. Many engineering structures such as bridges, buildings, dams and pipelines support a society’s economic prosperity and quality of life.
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