Acta Univ. Agric. Silvic. Mendelianae Brun. 2017, 65, 1317-1322

https://doi.org/10.11118/actaun201765041317
Published online 2017-09-01

Monitoring of Changes Signal Acoustic Emission Signals Using Waveguides

Jaroslav Začal1, Petr Dostál1, Michal Šustr1, David Dobrocký2

1Department of Technology and Automobile Transport Faculty of AgriSciences, Mendel University in Brno Zemědělská 1, 613 00 Brno, Czech Republic
2Department of Engineer Technologies, Faculty of Military Technology, University of Defence in Brno, Kounicova 156/65, 662 10 Brno, Czech Republic

This paper is focused on possibilities of acoustic emission (AE) signal detection from material surface through waveguide for commonly used piezoelectric sensors. It also considers the experimental study of enhanced detection of occurrence of signal guided through waveguide corpus, its changes and deformities. Aim of this work is verification of several waveguide setup possibilities for maximization of AE signal detection in practice. For this purpose, multiple waveguide setups were manufactured from stainless steel and aluminium alloy. Hsu‑Nielson pen test was utilized for signal actuation. Results demonstrate the differences between measured AE signal with and without employment of waveguide (changes in signal course through different materials and shapes), as well as magnitude of signal dampening and amplification necessary for veritable signal interpretation. Measurements were conducted on agglomerated composite of medium density fibreboard (MDF).

Funding

The research has been supported by the project No. 201613: Acoustic Detector of Plant Stress “ADOPS”; financed by TAČR GAMA TG02010074.

References

8 live references