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A method for estimating impact location of loose part using HHT

A method for estimating the impact location of a loose part is described in this paper, which uses Hilbert-Huang Transform (HHT) and dispersion characteristics of bending waves propagated in a plate. The power propagation velocity and arrival time difference of bending waves related to the dispersion characteristics can be obtained through the transformation of impact signals using Hilbert-Huang Transform. The distance from the impact location to the signal measuring point can be estimated using the information on the power propagation velocity and the arrival time difference of two bending waves. The experimental results show that the proposed method estimates the impact location with average relative percentage error in 7.68% compared with the actual impact location.