双频率锚泊线动力分析

Bi-frequency Analyses of Mooring Line Dynamics

本文比较详尽、全面地介绍了一种求解锚泊线动力响应的方法,即将锚泊线的非线性基本运动方程应用摄动法展开,并考虑了运动过程中由于锚泊线位置的变化所引起的对动力响应的影响,得到一阶和二阶的线性偏微分方程。并将此两方程在频率域内求解,得到一阶和二阶频率响应函数,再用傅里叶变换求得脉冲响应函数,将脉冲响应函数与输入卷积,即得锚泊线动态时历响应。为了验证这种方法,作者在上海交通大学流体力学实验室的水槽中进行了模型试验,并与理论结果相比较,两者获得了很好的一致。

A method of the calculation of mooring line dynamic is proposed in this paper. The method is based on the method of perturbation. The equations were solved in frequency domain to obtain the frequency response function, and the impulse response function in time domain can be obtained by applying Fourier inverse transform on such frequency responses. The time history of the response of the mooring line in oscillation can be calculated by a convolution integral which involves the input time history and the corresponding impulse response function In order to verify the validity of the proposed method, an experiment of an osci- llating model mooring line was conducted. Experiment results have been compared with theoretical results. The agreement between them is good