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Szukana fraza: [Abstrakt = "In the case of building structures, it is necessary to know the status of their individual elements, in particular in places subject to high loads. Knowledge of this state has a direct impact on the safety of using these. The above reason is a contribution to developing new and improving existing diagnostic methods. The methods that allow noninvasive diagnostics \(which does not require excluding the object from use during the measurement period\) are particularly valuable. The article presents the results of preliminary research on the possibilities of using the acoustic method in the analysis of the condition of metal building constructions. The measurement concept, the built\-in measuring stand and the way of carrying out the measurements are presented. In addition, the results of preliminary tests to show the recorded signals of dominant frequencies in the spectrum have been presented. The influence of the substrate on which the plate was placed and the number and type of damage to the spectrum of recorded acoustic signals were investigated."]

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