Fundamental frequency energy distribution of periodic vibrations and their relation to distance

Abstract

Surface vibrations have been comprehensively investigated in the past for its extensive applications. In this paper, we study the fundamental frequency estimation and its relationship to the propagation distance for periodic surface vibrations generated by electric devices. A novel peak interval selection method (PISM) is first developed to enhance the estimation accuracy on fundamental frequency. Then, a new Frequency Band Energy Percentage (FBEP) feature is proposed to characterize the energy variations among different frequency bands whose central frequency is a multiple of the fundamental frequency. In addition, the relationship between the energy variation in the FBEP feature and the propagation distance is also analyzed. Experiments on real recorded periodic vibrations generated by two electric hammers with different fundamental frequencies are conducted to show the effectiveness of the proposed algorithm.