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Non-Contact Smartphone-Based Monitoring of Thermally Stressed Structures. | LitMetric

Non-Contact Smartphone-Based Monitoring of Thermally Stressed Structures.

Sensors (Basel)

Laboratory for Nondestructive Evaluation and Structural Health Monitoring Studies, Department of Civil and Environmental Engineering, University of Pittsburgh, Pittsburgh, PA 15261, USA.

Published: April 2018

AI Article Synopsis

Article Abstract

The in-situ measurement of thermal stress in beams or continuous welded rails may prevent structural anomalies such as buckling. This study proposed a non-contact monitoring/inspection approach based on the use of a smartphone and a computer vision algorithm to estimate the vibrating characteristics of beams subjected to thermal stress. It is hypothesized that the vibration of a beam can be captured using a smartphone operating at frame rates higher than conventional 30 Hz, and the first few natural frequencies of the beam can be extracted using a computer vision algorithm. In this study, the first mode of vibration was considered and compared to the information obtained with a conventional accelerometer attached to the two structures investigated, namely a thin beam and a thick beam. The results show excellent agreement between the conventional contact method and the non-contact sensing approach proposed here. In the future, these findings may be used to develop a monitoring/inspection smartphone application to assess the axial stress of slender structures, to predict the neutral temperature of continuous welded rails, or to prevent thermal buckling.

Download full-text PDF

Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5948516PMC
http://dx.doi.org/10.3390/s18041250DOI Listing

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