基于PCL语言的船体剖面特性计算

Calculation of hull section characteristics based on PCL

船体剖面的中和轴与惯性矩等剖面特性值是船舶结构有限元分析过程中的常用参数。目前,大部分计算剖面特性的软件需要单独建立剖面模型,而不能直接基于已有的有限元模型进行计算。本文推导了倾斜板和骨材剖面自身惯性矩计算公式,并基于PCL语言编写直接从Patran模型数据库读取几何信息,计算船体剖面面积、中和轴高度和惯性矩的程序。程序考虑梁单元的偏心,能够智能识别纵向构件,自动侦测并剔除横向构件,对剖面特性变化大的部位也能够精确地计算出剖面特性值。

The height of neutral axis and the moment of inertia of hull section are widely employed in the FEM analysis of ships. At present,most software for hull section calculation is not based on the FEM model and requires separate section model. In this paper,the formulas of moment of inertia of inclined components are derived and a PCL- based calculation program is developed to access data directly from Patran＇s database and to calculate the area,the height of neutral axis and the moment of inertia of the hull section. The proposed program takes the offsets of beam elements into account and can automatically recognize the longitudinal components while rejecting the transverse ones. It can also accurately calculate the sections with varying characteristics.