Abstract: Numerical simulation on the static and dynamic characteristics of the rigid base has been conducted based on finite element analysis (FEA) to verify the reliability and safety of the rigid base of the designed marine diesel generator set. The modeling of the components and BOM assembly is completed by using the NX11.0 software integrated in the Teamcenter platform, according to the schematic diagram of the rigid base from the selected design. After simplifying the component features, the BOM assembly is imported into FEA software for static and dynamic modal simulations of the rigid base. The calculation results show that the static strength and stiffness of the designed rigid base meet the operational requirements, and the first six natural frequencies are much higher than the external excitation frequency. There will be no resonance phenomena, and the dynamic strength and the stiffness of the structure are reliable, verifying the rationality of the selected design. It allows for the early evaluation and prediction of the reliability and safety of the structural performance of the rigid base. It provides theoretical support for subsequent product processing and manufacturing and offers direction for further optimization of the product design.

Key words: finite element analysis (FEA), marine diesel generator set, rigid base, reliability, statics, dynamics

摘要： 为了验证设计的船用柴油发电机组刚性底座的可靠性和安全性,文中对其静、动态特性开展基于有限元分析（finite element analysis,FEA）的仿真研究。依据选型设计阶段的刚性底座原理图,使用Teamcenter平台中集成的NX 11.0软件完成零部件建模和BOM装配体构建;完成零部件特征简化后,将BOM装配体导入FEA软件,进行刚性底座静力学与动力学模态仿真计算。计算结果表明：设计的刚性底座静强度、刚度满足使用要求,同时前6阶固有频率远高于外界激励频率,不会发生共振,结构动强度、刚度可靠;由此验证了选型设计的合理性,提前评估预测了刚性底座结构性能的可靠性和安全性,为后续产品加工制造提供了理论支撑,也为产品进一步优化设计提供了方向。

关键词: 有限元分析, 船用柴油发电机组, 刚性底座, 可靠性, 静力学, 动力学