The aim of the paper is to introduce a less used method for the evaluation of non-stationary and especially transient phenomena
in railway structures to the wider professional public. This method may find wide application in many technical and other
fields. It is the so-called Hilbert-Huang transform. In this paper, its application in the study of dynamic phenomena occurring in a
selected superstructure structure is shown. The calculation procedure of the presented transform differs from traditional tools, which
include, for example, the short-term Fourier transform or the Wavelet transform. The paper includes a mathematical analysis and description
of this transformation. Furthermore, the paper contains a description of the measurement method used, a discussion of the
results obtained and recommendations for practice.
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