针对船用复合材料螺旋桨叶片,分别采用壳单元赋予不同截面参数和实体单元赋予不同等效材料参数两种建模方法进行了有限元分析,对比了壳单元和实体单元模型的模态、均布压力载荷下的响应以及均匀温度场中的热变形.结果表明:对于从桨根到桨尖各位置铺层不同的叶片来说,两种建模方法在建模时间和铺层调整便捷性方面各有利弊;模态分析中两种模型的固有频率和振型计算结果存在一定差异,它们均可在一定条件下用于复合材料螺旋桨叶片模态计算;两种模型中,模拟均布压力载荷下的响应时应采用壳单元模型,而分析叶片在均匀温度场中结构的热变形应采用实体单元模型.
The shell elements with different section parameters and the solid elements with different equivalent ma terial properties were used in the finite elements analysis of the composite marine propeller blade.The modal analysis,the response under uniformly distributed pressure loads and the thermal deformation in uniformly distributed temperature fields of the shell finite element modeling (FEM) were compared with those of the solid FEM.The re sults show that each of the two modeling methods has its own advantages and disadvantages on the modeling time and the layup adjusting convenience for blade with a variable layup from root to tip.There are some differences in the frequencies and the mode shapes in the modal analysis between two different FEMs,and each FEM is practicable for the modal analysis of the composite propeller blade under a given condition.For the two models,the shell FEM should be used in the response simulation under uniformly distributed pressure loads,while the solid FEM is suggested to analyze the thermal deformation of the blade in uniformly distributed temperature fields.
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