Effect of Hammer Type on Generated Mechanical Signals in Impact-Echo Testing

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dc.contributor.authorDvořák, Richardcs
dc.contributor.authorTopolář, Liborcs
dc.coverage.issue3cs
dc.coverage.volume14cs
dc.date.accessioned2021-05-06T10:55:01Z
dc.date.available2021-05-06T10:55:01Z
dc.date.issued2021-01-28cs
dc.description.abstractThe impact-echo diagnostic method is a well-known nondestructive pulse compression test method, which can be relatively easily used for the testing of concrete and reinforced concrete elements. The evaluation of the measurement with this method is based on the analysis of the signal itself in the time and frequency domains. This allows acquisition of information on the velocity of the mechanical wave, the resonant frequency of the specimen or on the presence of internal defects. The ability to interpret these measurements depends on the experience of the diagnostic technician. The advent of classification algorithms in the field of machine learning has brought an increasing number of applications where the entire interpretation phase can be considerably simplified with the help of classification models. However, this automated evaluation procedure must be provided with the information of whether the signal acquired by the test equipment has actually been measured under optimally set conditions. This paper proposes a procedure for the mutual comparison of different measuring setups with a variable tip type, hammer handle and impact force. These three variables were used for a series of measurements which were subsequently compared with each other using multi-criteria evaluation. This offers a tool for the evaluation of measured data and their filtering. As an output of the designed method, each measurement is marked by a score value, which represents how well the acquired signal fit the weight demands for each observed feature of the signal. The method allows the adjustment of selected demands for a specific application by means of set thresholds. This approach enables the understanding of characteristics of the signal in the automated pre-processing of measured data, where computing power is limited. Thus, this solution is potentially suitable for remote long-term observations with sensor arrays or for acoustic emission signals pre-processing.en
dc.formattextcs
dc.format.extent1-19cs
dc.format.mimetypeapplication/pdfcs
dc.identifier.citationMaterials . 2021, vol. 14, issue 3, p. 1-19.en
dc.identifier.doi10.3390/ma14030606cs
dc.identifier.issn1996-1944cs
dc.identifier.other168392cs
dc.identifier.urihttp://hdl.handle.net/11012/196707
dc.language.isoencs
dc.publisherMDPIcs
dc.relation.ispartofMaterialscs
dc.relation.urihttps://www.mdpi.com/1996-1944/14/3/606/htmcs
dc.rightsCreative Commons Attribution 4.0 Internationalcs
dc.rights.accessopenAccesscs
dc.rights.sherpahttp://www.sherpa.ac.uk/romeo/issn/1996-1944/cs
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/cs
dc.subjectimpact-echo methoden
dc.subjecthammeren
dc.subjectfast Fourier transformen
dc.subjectSaaty matrixen
dc.subjectfeature extractionen
dc.subjectnondestructive testingen
dc.subjectcivil engineeringen
dc.titleEffect of Hammer Type on Generated Mechanical Signals in Impact-Echo Testingen
dc.type.driverarticleen
dc.type.statusPeer-revieweden
dc.type.versionpublishedVersionen
sync.item.dbidVAV-168392en
sync.item.dbtypeVAVen
sync.item.insts2021.07.07 08:52:58en
sync.item.modts2021.07.07 08:14:02en
thesis.grantorVysoké učení technické v Brně. Fakulta stavební. Ústav fyzikycs
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