运用NASTRAN进行波浪载荷作用下船体强度分析

The Strength Analysis of Overall Ship under Wave Loads with NASTRAN

充分利用MSC公司的PATRAN和NASTRAN软件,结合自编程序实现波浪载荷作用下的全船准静态强度分析.船体总不平衡力以及结构的总质量,质心位置,主转动惯量,主惯性轴的方向等参数利用PATRAN和NASTRAN的现有功能可以得到;利用自编程序,计算出波浪载荷下各节点的平衡惯性力,以合适的格式添加进bdf文件,并提交NASTRAN进行全船准静态强度分析.算例表明上述方法可以实现惯性力的计算和施加,从而拓展了NASTRAN软件在船体结构准静态分析中的应用.

The pseudo-static analysis of an overall ship structure subjected to wave loads actions were carried out by making most of MSC.PATRAN and MSC.NASTRAN. The imbalance resultant and mass matrix of overall ship can be obtained by the static or modal analysis with NASTRAN. Several useful parameters of structure such as total mass, position of mass center, principal inertia quantities and its principal direction of overall ship can be obtained via the tools of PATRAN after structural discretization. The calculation program was coded according to the inertia force theory and is called 'InertiaF'. Since all calculating parameters of ship structure were gained, the inertia loads can be calculated out and outputted with 'InertiaF'. Then, adding the inertia loads to the data file of pseudo-static analysis and submitting it to NASTRAN will finish the strength analysis of overall ship under wave loads. The analysis of an example was given and the results indicate that this method can fulfill the expected functions, the application of NASTAN can be expanded in ship structure analysis.