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Monitoring Changes in Mechanical Properties of Rock Bolts Using a Low-Power Coded-Excitation Scheme
Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.ORCID iD: 0000-0002-6216-6132
Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.ORCID iD: 0000-0002-9225-8150
Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.ORCID iD: 0000-0001-8647-436x
2018 (English)In: 2018 IEEE INTERNATIONAL ULTRASONICS SYMPOSIUM (IUS), IEEE, 2018, article id 8580038Conference paper, Published paper (Refereed)
Abstract [en]

In-situ inspection and quality assessment of rock bolts and other load-bearing structural elements, has received significant attention over the years, but there are still no techniques available capable of monitoring changes over time in mechanical properties of already installed bolts. Since mechanical changes will also affect the propagation of mechanical waves, ultrasound is a strong candidate. In this paper we propose a technique based on Orthogonal Frequency Division Multiplexing (OFDM) for coding the transmitted ultrasound pulse in such a way that the propagation channel (transducer and rock bolt combined) can be estimated. We show that a transmit voltage of 1.1 V r.m.s. is sufficient to obtain reliable channel estimates even in bolts as long as one meter. The channel estimates are then used to predict changes in tensile stress on the bolt, from experiments conducted in a laboratory environment.

Place, publisher, year, edition, pages
IEEE, 2018. article id 8580038
Series
IEEE International Ultrasonics Symposium, ISSN 1948-5719, E-ISSN 48-5727
National Category
Signal Processing
Research subject
Signal Processing
Identifiers
URN: urn:nbn:se:ltu:diva-72802DOI: 10.1109/ULTSYM.2018.8580038ISI: 000458693001081Scopus ID: 2-s2.0-85060589109ISBN: 978-1-5386-3425-7 (electronic)ISBN: 978-1-5386-3426-4 (print)OAI: oai:DiVA.org:ltu-72802DiVA, id: diva2:1286222
Conference
2018 IEEE International Ultrasonics Symposium, IUS 2018; Kobe; Japan; 22-25 Oct 2018
Available from: 2019-02-06 Created: 2019-02-06 Last updated: 2019-03-11Bibliographically approved

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Carlson, Johan E.Mohamad, MedhatBeek, Jaap van de

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