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本文在规则波浪与海流联合作用下对海洋钻井隔水管进行了动力分析,对非线性拖曳力采用改进的线性化方法,推导了有限元线性振动方程。求解这些方程几乎象静力方程一样,只需要少数几次迭代就可求得响应最大值。同时给出一些规则波浪与海流联合作用下的算例,并对由本文方法和由非线性时间域动力分析方法分别求得的两种结果进行了比较。比较表明,两种计算结果吻合。本文的线性化方法及把动力方程变换为静力方程的方法,能节约计算机时。隔水管是海洋工程中较典型的构件,该分析方法便于实际应用。
In this paper, the dynamic analysis of marine drilling riser under the combined effect of regular wave and ocean current is carried out. The nonlinear linear drag of nonlinear drag force is derived and the linear vibration equation of finite element is deduced. Solving these equations is almost like static equations, requiring only a few iterations to find the response maximum. At the same time, some examples under the combined action of regular wave and ocean current are given, and the two results respectively obtained by this method and the nonlinear time domain dynamic analysis method are compared. The comparison shows that the two results are in good agreement. The linearization method in this paper and the method of transforming dynamic equations into static equations can save computer time. The riser is a typical component of marine engineering, and the method of analysis is convenient for practical application.