Abstract
This paper presents a research work on diagnostics using continuous scanning laser methods. Structural Health Monitoring based on laser vibrometry can exploit the ability of a scanning laser to measure vibration responses remotely both regarding temporal and spatial resolution. Therefore, it can be a powerful approach for rapid damage detection of components presenting an unhealthy dynamic behaviour. The work is focused on numerical analysis of a cantilever beam which is subjected to damage of different severity levels. The severity will be measured regarding response phase shift for a fixed excitation frequency. The simulated nodal responses of the surface being scanned by a laser beam are selected and used for simulating the spectral responses obtained from CSLDV methods. The main objective of this work is to determine the structural integrity based on an indicator obtained by referencing the relative spectral sidebands between a pristine and damage condition.
Highlights
In recent years, durability and extension of life of components has become an important topic of research
This paper focuses on Continuous Scanning Laser Doppler Vibrometry (SLDV), which main advantage is fast acquisition of both spacial and temporal information
The time signal from a sinusoidal line scan can be modulated to a frequency spectrum [4], which can be used for Structural Health Monitoring (SHM)
Summary
Durability and extension of life of components has become an important topic of research. The early detection of damage is highly interesting for for maintenance in the industry, which supported research for better diagnostic tools. These consist of destructive and nondestructive methods. A conventional way of testing is to apply strain gauges to the component These cannot be placed on rotating shafts, for example. The fastening methods cannot always be applied due to high operating temperature This can be omitted by using a non-destructive and non-contact measurement technique. Most of these techniques use either laser light, such as Holography, Speckle interferometry and Scanning Laser Doppler Vibrometry (SLDV), or a camera, like Digital Image Correlation (DIC). To exploit its main advantage of speed, the level of SHM is reduced to 1 in this study, where only the detection of damage is pursued
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