TY - JOUR A1 - Algernon, Daniel A1 - Wiggenhauser, Herbert T1 - Impact echo data analysis based on Hilbert-Huang transform JF - Transportation research record N2 - Impact echo is an acoustic method based on the use of transient stress waves generated by an elastic impact; it is used for nondestructive testing of concrete structures. In practical applications, the signals obtained often are superimposed by further mechanical vibrations and the so-called geometry effects, which are caused mainly by surface waves. Because of attenuation in the concrete as well as the divergence of the acoustical waves, impact echo signals are transient. As a result, the frequency content changes over time. Normally the analysis is carried out on the Fourier power spectrum of the signal. However, the Fourier spectrum is still affected by the mentioned effects and has well-known deficiencies for short transient signals within longer time sweeps. Application of the Hilbert-Huang transform is presented as a refined method for the time-frequency analysis of nonstationary impact echo data. The basic properties of the method and its practical application for time-frequency analysis of impact echo data, signal filtering, and pattern identification are presented. KW - Impact echo KW - Hilbert-Huang transformation PY - 2007 DO - https://doi.org/10.3141/2028-16 SN - 0361-1981 VL - 2028 SP - 146 EP - 153 PB - National Research Council CY - Washington, DC AN - OPUS4-20790 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -