船舶压载舱阴极保护屏蔽效应研究

【作者】 李碧英；

【导师】 黄一； 周美；

【作者基本信息】 大连理工大学 ， 船舶与海洋结构物设计制造， 2002， 硕士

【摘要】 本文在讨论了阴极保护电位场问题的数学模型的基础上，以二维边界元法对阴极保护问题中的电位及电流密度分布进行了模拟计算，重点对船舶压载舱中的典型结构如加强筋、人孔等在阴极保护中所产生的屏蔽效应进行了分析和研究，通过对不同高度、厚度的挡板及不同孔径的带孔板所产生的屏蔽效应进行模拟计算，首次得到了一些对实际工程设计具有重要参考意义的见解。计算结果表明，由于压载舱内各种挡板对保护电流的屏蔽效应，现行的阴极保护设计方法无法实现压载舱内可靠的阴极保护设计。需要通过大量的数值模拟计算或实测，得到各种挡板对保护电流的屏蔽效应的定量化模型，以确立新的适合于压载舱的阴极保护设计的技术体系。更多还原

【Abstract】 Based on some discussions on the mathematic model set up for the cathodic protection potential field, a two-dimensional boundary element method (BEM) is developed, and by using which, a study on the shielding effect resulted from some typical inner structures such as the reinforcing elements and the partition walls with man holes on distribution of potential and current density in the cathodic protection is performed. The investigated parameters which affect the shielding effect in the calculating model include: the height and thickness of the reinforcing elements, the distance between the anode and the reinforcing elements, and the diameter of man hole on the partition walls, and so on. From the simulating calculated results for several ideal models, some important views for practical design of cathodic protection are achieved. The calculated results show that it is impossible to realize a reliable design of the cathodic protection for a ballast bank because of the shielding effect resulted from many inner structures on protection current. In order to design a reliable cathodic protection system for a ballast bank, it is necessary to develop a quantitative model for the shielding effect due to the inner structures on the protection current in a cathodic protection system of a ballast tank through a lot of numerical simulation or practical measure.更多还原