Journal ArticleDOI
Coda wave interferometry-based very early stage bolt looseness monitoring using a single piezoceramic transducer
TLDR
In this article , a coda wave interferometry (CWI)-based high-resolution bolt preload monitoring using a single piezoceramic transducer is proposed.Abstract:
Abstract The traditional monitoring methods can only give warnings for the bolts with severe looseness. However, it is essential for the safety of bolted joints to detect the looseness of bolts at the very early stage. To this end, in this paper, coda wave interferometry (CWI)-based high-resolution bolt preload monitoring using a single piezoceramic transducer is proposed. According to the CWI and acoustoelastic theories, a theoretical model is established and the linear relationship between the time shifts of coda waves and the preload variations of the bolt is derived. An experiment, in which a piezoceramic transducer simultaneously functions as the actuator and sensor, was carried out to verify the effectiveness of the proposed method. Three lead zirconium titanate transducers at different locations of a bolted specimen are tested. The experimental results show that the time shifts of coda waves increase linearly with the decrease of bolt preload and the detectable resolution of bolt preload (DRBP) is up to 0.326%. The DRBP value proves that the proposed technique can successfully monitor bolt looseness at the very early stage. In addition, a comparison study is carried out between the CWI-based method and the energy-based wavelet packet decomposition (WPD) method, and the result shows that the preload sensitivity of the CWI-based method is about six times higher than that of the WPD approach. Therefore, the CWI-based method is an effective way for the in situ monitoring of bolt looseness, especially in the embryonic stage. read more
Citations
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Journal ArticleDOI
Embedded PZT aggregates for monitoring crack growth and predicting surface crack in reinforced concrete beam
TL;DR: Wang et al. as mentioned in this paper proposed an approach to monitor the cracks growth process of reinforced concrete beam using embedded piezoelectric aggregates, and a damage index was introduced to estimate the crack damage degree in concrete structure on this basis.
Journal ArticleDOI
Percussion-based quasi real-time void detection for concrete-filled steel tubular structures using dense learned features
TL;DR: In this article , a percussion-based void detection method using dense learned features was proposed, which leverages CNN, GAP, and CAM to obtain high accuracy for detecting subsurface voids of concrete-filled steel tubular structures.
Journal ArticleDOI
Full-range bolt preload monitoring with multi-resolution using the time shifts of the direct wave and coda waves
TL;DR: In this paper , the authors proposed a full-range monitoring approach with multi-resolution using the time shifts of the direct wave and coda waves, which can be used as a low-resolution "probe" to monitor significant preload deterioration.
Journal ArticleDOI
Experimental Evaluation of Wearable Piezo Ring for Bolted Connection Monitoring Using the Active Sensing Approach
TL;DR: Wang et al. as mentioned in this paper designed a wearable piezoelectric ring based on a material is designed and it can be easily integrated into the bolt connection as a washer, which can be used to monitor the bolted connection to ensure the safety of the whole structure.
Journal ArticleDOI
Proof-of-concept study of bolt connection status monitoring using fiber Bragg grating curvature sensor
TL;DR: In this article , a novel method with fiber Bragg grating (FBG)-based curvature sensor is proposed for connection status monitoring of bolted joint groups, which can provide a general solution for the on-line monitoring of bolt connection status for large-span distributed bolted-joint groups.
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TL;DR: In this article, a more comprehensive review of recent literature in the broader area of mechanics of mechanically fastened joints in polymer-matrix composite structures is presented, including joint design methodologies, considerations of the influence of geometric effects and fastener preload selection.
Journal ArticleDOI
Vision-based detection of loosened bolts using the Hough transform and support vector machines
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