ワイヤーケーブルの構成とガイド波伝播特性の関連性評価

抄録

Wire cables are widely used for industrial field. Non-destructive inspection techniques are required to evaluate the damage in order to detect failure of wire cable at an early stage. Guided wave inspection was one of the effective techniques for wire cable. However, to estimate the characteristics of guided wave propagation in many types of wire cable are needed. In this study, guided waves were detected using two types of 6-strand wire cables that have 7 wires or 19 wires in one strand. In experiment, guided waves were produced by pulse YAG leaser and detected by PZT sensor on the strand. The experiments were carried out under 98 N tensile force. Detected guided waves were analyzed by using wavelet contour map of waveforms. The amplitudes of guided wave that detected in large number of wires were smaller than detected in small number of wires. Moreover, the wavelet coefficients of 6 x 19 wire cable and 6 x 7 wire cable were roughly same. We considered that this trend is caused by dispersion of guided wave energy. As a result, we presumed that high energy guided waves were needed to inspect wire cables constructed large number of wires.