基于参数化子模型的 SWATH 船典型节点抗疲劳设计

摘要

Complex alternating load, special structural form and extensive use of high-strength steels cause serious fatigue strength problems of typical details of small waterplane area twin hull ship(SWATH). For this issue, the study based on finite element(FEM) structural strength analysis result of one SWATH complete model, and used sub-model method to analyze fatigue strength of high stress concentration area of SWATH pillar structure. Miner linear cumulative damage theory and Weibull distribution model was used in fatigue strength analysis. Combined with FEM software Ansys and Ansys parametric design language (APDL), parametric sub-model of the typical detail and optimization modelwere built by cumulative damage degree and shape and size parameters of the structure to study optimization design. Results of the examples show that this method could provide high fatigue strength and light structural weight design scheme of typical detail′s shape and size, and offered conference in SWATH structure anti-fatigue design.%复杂的交变载荷、特殊的结构形式和高强度钢的大量使用使小水线面双体船连接桥结构的疲劳强度问题尤为突出。针对此问题，研究在整船有限元分析的基础上，采用子模型法对 SWATH 船支柱体高应力集中区域的典型节点进行基于 Miner 线性累积损伤理论和 Weibull 分布连续模型的疲劳强度分析。并通过有限元分析软件 Ansys及其参数化编译语言 APDL 建立该典型节点的参数化子模型，结合以表征结构疲劳寿命的累积损伤度和影响疲劳强度的形状和尺寸参数建立的优化模型进行优化设计研究。算例结果表明，该方法能够在提高结构疲劳强度的情况下，提出结构重量较轻的节点形状和尺寸方案，为此类结构的抗疲劳设计提供参考。