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Lamb wave based SHM however relies on wave propagation, offers characteristics of efficiency and convenience and this study seeks to investigate its application. The study is significant to structural health monitoring and involved stakeholders to monitoring processes because it seeks to validate a convenient and cheaper monitoring approach towards higher survivability of structures. The study aims at investigating feasibility of application of 3D laser vibrometer in conjunction with Lamb wave technique. This will incorporate literature review, implementation of experimental and specimen design, measurement of scattering waves on used structures, and analysis of results. Numerical approach was used to investigate robustness of the lamb wave model. A validated simulation study was done using ANSYS program to study propagation and scattering of waves and an experiment to investigate propagation and scattering of waves was done on aluminium specimens with the aid of 3D vibrometer. The simulation and the experiment identified effects of a blind hole on wave propagation and scattering. Validation of the simulation demonstrated point differences in propagation and scattering relative to position of a blind hole. ...
Its significance has grown among engineers because of its ability to generate timely and accurate data on health and functionality of structures, properties that allows it to ameliorate maintainability and safety concerns (Staszewski et al. 2004). The monitoring approach detects anomalies, specifies anomalies’ exact location, and evaluates damage extent towards corrective measures, a scope that offers economic, and safety advantages. Other applications of SHM include mitigation of uncertainty, planning for schedule activities, and test of hypothesis. There are three theoretical SHN techniques, visual inspection, traditional non-destructive evaluation methods, and remote monitoring. Visual inspection involves inspection by experienced and trained personnel while traditional non-destructive evaluation applies wave propagation approaches for defect detection. The approaches are however expensive, labour intensive and complicated while remote monitoring is automated and autonomous, only requiring attention on critical conditions (Thomas et al. 2009). Lamb waves for remote monitoring, for instance, only rely on wave propagation but instrumentation and interpretation needs hinder its efficiency (Franco et al. 2008). Lamb-wave based SHM efficient and convenient for detecting metallic structure cracks and delamination and disbanding of composites (Ong and Chiu 2012). Significance The study is significant to structural health monitoring as it proposes a cheap and convenient monitoring strategy that will facilitate regular inspection for damage detection and remedies. This scope extends the study’s significance to stakeholders to monitoring processes because validating the lamb wave based method will ensure the ...Show more
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Scattering of lamb waves from typical structure defects in plates Name: Institution: Course: Tutor name: Date: July 9, 2013 Scattering of lamb waves from typical structure defects in plates Executive summary Structural health monitoring is a process of periodic detection of damages on structure’s components, as well as development and implementation of plans for remedying of the detected damages…
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