摘要
This paper experimentally investigated wire breakage detection in a steel cable by acoustic emission(AE)waveform.In the experiments,the attenuation laws of waveform amplitudes were discussed based on stress wave propagation in the wire,which was generated by kNocking and wire breakage.Then the wave velocity was calculated based on the reach time of the stress wave from each sensor.Finally,based on the waveform attenuation laws and the linear position method,the amplitude and energy of the source were confirmed through the measured waveform to identify the source category.The experimental results illustrated that the stress wave from different sources has a different frequency spectrum,and the amplitude attenuation factor varied with the stress wave frequency;high frequency waves had a greater attenuation factor.Compared with the other source,the wire breakage source contained a much higher energy,and thus,the wire breakage signal can be distinguished from the other source by comparing the non-attenuation energy at the source position.
基金
The authors would like to thank the State Key Laboratory on Disaster Reduction in Civil Engineering for its financial support(Grant No.SLDRCE08-A-05).
