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高压海缆敷设是海上风电场开发的关键环节。为了提高海缆敷设与登陆的仿真模拟精度,文章采用水动力分析方法在SESAM/HydroD软件中施加粘性阻尼得到了敷缆船运动响应幅值算子（RAO）。在Orcaflex软件中建立敷缆船-高压海缆-系泊系统耦合模型,研究了船舶粘性阻尼对耦合系统响应的影响,并通过对海缆位形、张力和曲率的对比评估给出了海缆登陆最大允许作业海况。研究结果表明,考虑粘性阻尼后船体的垂荡幅值减小55%,海缆敷设时的有效张力、曲率及海缆登陆时的偏移量均明显减小。以考虑船舶粘性阻尼的分析结果作为工程指导,可有效减少海缆登陆海域作业面积并增加作业窗口期,提高海缆敷设效率。

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Three kinds of AE signals were obtained through clustering and analyzing the acoustic emission signals of rock burst experiments and the characteristic parameters including AE energy,ringing count,rise time and frequency.By analyzing the characteristic parameters of three kinds of AE signals deeply,excavating their corresponding physical meanings,the fracture characteristics were revealed.Based on the rate of energy release,the main types of rock failure formed by driving rock burst were determined.Use the corresponding AE signals,the rock burst was predicted.The results show that the first kind of signals has high energy,high counts,low rise time and low frequency features,and the “two highs and two low” feature corresponds to the stable expansion of crack with high strength and large scale.The second kind of signals has high energy,high counts,high rise time and low frequency features,and the “three highs and one low” feature corresponds to the unstable expansion of crack with high strength and large scale.The third kind of signals has low energy,low ringing count,low rise time and low frequency features,and the “four low” feature corresponds to the unstable expansion of crack with low strength and small scale.Among them,the unstable expansion of crack with high strength and large scale is the main driving force of rock burst.The “three highs and one low” feature can provide early warning information for rock burst.It is the key target of early warning research of rock burst disaster. [ABSTRACT FROM AUTHOR]