中文摘要：

通过实验及信号处理的手段，研究了声发射信号沿海洋平台传播的特性与规律。开展海洋平台声发射监测实验得到声发射信号时域波形等数据，利用特征参数分析几何尺寸、管节点、信号源与传感器相对位置等因素对声发射信号衰减规律的影响，并采用小波包能量谱方法确定信号衰减的频域特征。

英文摘要：

Investigation on the propagation characteristics and laws of Acoustic Emission （AE） in the offshore platform structural system was proposed in this paper. The AE monito- ring experiment of offshore platform was conducted, and data acquisition and parameters ex- tracted were carried out for the AE signal. The effects of member geometric dimension and tu- bular joints on the attenuation rule of the AE signal was investigated, and the distribution mode of signal on the surface of the member was also analyzed. Wavelet packet energy spec- trum method was used to determine the main frequency properties of the attenuated AE sig- nal.