Análise de sensibilidade de um método expedito para avaliação dos esforços de tração em linhas de ancoragem

Abstract

Recently, accidents in floating units caused by structural failure of mooring lines have drawn the attention of the oil and gas industry. These events have significantly increased the need for continuous monitoring of the structural integrity of mooring lines, which has fueled the demand for reliable and computationally inexpensive methods for obtaining the tension responses over time in these lines. Among the various methods available for obtaining these time series, two stand out as the most common: the first is a quasi-static approach, which consists of a simplified analysis using only the catenary equation; and the second, through the Finite Element Method (FEM), using tri-dimensions non-linear bar elements. The catenary equation is commonly used for evaluating tension in cables due to its low computational cost. However, this method does not consider the effects of damping and inertia in the lines. On the other hand, the FEM considers the effects of damping and inertia to obtain the forces over time but has a higher computational cost. This work aims to investigate the use of a method that combines high accuracy with low computational cost, thus providing a reliable and computationally inexpensive evaluation of the tension response of mooring lines.