[1E5] Digital camera's parameter identification for vibration-based structural health monitoring under different dynamic responses
Z Azouz, M Kuruvilla, M Khan and F He
Cranfield University, UK
Vibration-based structural health monitoring (SHM) is critical in assessing structural integrity. However, traditional methods of contact vibration sensors, such as accelerometers, face inherent limitations regarding accessibility, coverage and their impact on structural dynamics. In recent years, digitalisation has introduced novel possibilities for overcoming these challenges through camera-based measurements. Nonetheless, a knowledge gap exists concerning the interdependencies among camera speed, resolution and the accuracy of extracted dynamic features from captured results. This paper aims to address this gap by examining the influence of camera settings on the accuracy and reliability of visual-based vibration measurements. The study measured the natural frequencies and resonance amplitudes of the cracked cantilever beams exhibiting diverse dynamics. During the tests, the camera recorded the vibration behaviour with different speed and resolution settings. Through analysis of the acquired data, this study seeks to establish trade-offs between camera parameters and measurement accuracy, ultimately enhancing the reliability and effectiveness of crack detection within visual-based vibration monitoring.
