机匣螺栓连接虚拟薄层单元建模方法

Modelling Method of Virtual Thin-layer Element of Casing Bolted Connection

针对螺栓连接的复杂性与特殊性,对机匣螺栓连接薄层单元法基本原理与方法进行研究,提出虚拟薄层代替实体薄层完成机匣连接建模。建立实体薄层连接有限元模型与虚拟薄层连接有限元模型,通过模态分析对两种有限元模型进行相关分析。研究结果表明:虚拟薄层单元法建立的连接模型与实体薄层单元法建立的连接模型最大频率误差为-4.5%,模态振型匹配良好,采用虚拟薄层单元法能较好地模拟螺栓连接,并能有效避免薄层单元所产生的机匣轴向位置偏移。

In regard of the complexity and particularity of bolted connection,the basic principle and method of thin-layer element for casing bolted connection are studied,and virtual thin layer is proposed to replace solid thin layer to complete casing connection modeling.The solid thin layer connection finite element model and virtual thin layer connection finite element model are established,and the correlation analysis of the two finite element models is compared by modal analysis.The results show that the maximum frequency error of the two connection models established by the virtual thin-layer element method and the solid thin-layer element method is-4.5%with well-matched mode shapes.The virtual thin-layer element method better simulates the bolt connection and effectively avoids the axial position deviation of the casing caused by the thin layer element method.