2020
DOI: 10.1007/s42452-020-03251-7
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Health monitoring of bolted joints using modal-based vibrothermography

Abstract: This article presents a novel modal-based vibrothermographic approach for health monitoring of loosening bolted joints in coupled structures. In this article, the theoretical background supporting this proposed approach is firstly presented. Through finite element analyses on a simple bolted structure with varying joint conditions achieved by adjustment of bolt loads, the relationship between the bolt load and the temperature increase in the vibrating bolted joint during vibrothermographic tests was revealed. … Show more

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Cited by 6 publications
(2 citation statements)
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“…One of the indicators that helps to assess the technical condition of a marine diesel engine is the level and nature of changes in its vibration [11,12]. Any deviations from normal operating conditions in marine diesel units are reflected in their vibration characteristics [13,14], which can be used to diagnose the condition of parts of a cylinder-piston group using on-site methods based on vibration indicators [15,16]. Previous studies on engine vibration have estimated the relative significance of different sources of sound vibration, indicating that piston impacts during shifting are among the most significant sources [13].…”
Section: Methodsmentioning
confidence: 99%
“…One of the indicators that helps to assess the technical condition of a marine diesel engine is the level and nature of changes in its vibration [11,12]. Any deviations from normal operating conditions in marine diesel units are reflected in their vibration characteristics [13,14], which can be used to diagnose the condition of parts of a cylinder-piston group using on-site methods based on vibration indicators [15,16]. Previous studies on engine vibration have estimated the relative significance of different sources of sound vibration, indicating that piston impacts during shifting are among the most significant sources [13].…”
Section: Methodsmentioning
confidence: 99%
“…Vibrothermography (also known as sonic thermography or thermosonics) is another active infrared thermography technique in which the test-piece is subjected to an external vibrational excitation, e.g., using an actuator bonded to the surface [ 8 ]. The dynamic response of the test-piece leads to activation of hardly detectable defects and makes them act as internal heating sources [ 9 , 10 , 11 ]. The vibration-induced heat generated at the defected area directly diffuses to the generally cold inspection surface and reveals the defect when its thermal signature is above the noise level of the infrared camera (i.e., 20 mK for a high-end cooled camera).…”
Section: Introductionmentioning
confidence: 99%