装配工艺参数对止口螺栓连接结构力学特性的影响分析

Analysis of Influence of Assembly Process Parameters on Mechanical Properties of Bolted Joint with Spigots

以航空发动机转子系统中止口螺栓连接结构为研究对象,基于单螺栓连接结构分析弯曲刚度的非线性特征,利用ANSYS实体单元建模方法分析连接结构的弯曲刚度,重点讨论了有无止口连接、预紧力、螺栓直径、止口过盈量等装配工艺参数对连接结构弯曲刚度的影响规律,并分析了止口连接结构对转子系统固有特性的影响.研究结果表明:止口连接结构的弯曲刚度呈现分段特性;增大预紧力、螺栓直径以及止口过盈量能提高连接结构弯曲刚度;有无止口连接结构的转子系统前三阶固有频率的相对误差小于2%,止口连接结构能够降低转子系统的最大振动幅值.

The bolted joint with spigots of the aero‑engine rotor system is taken as the research object,and the non‑linear characteristics of the bending stiffness of the single bolted joint are analyzed.The bending stiffness of the bolted joint is analyzed by ANSYS,and the influence laws of such assembly process parameters as the bolted joint with or without a spigot,the initial preload of bolts,bolt diameter,and the interference of the spigot on the joint bending stiffness are discussed.The influence of the spigot on the inherent characteristics of the aero‑engine rotor system is analyzed.The results show that the bending stiffness of the joint with the spigot presents piecework characteristics.Increasing preload of bolts,the bolt diameter and the interference of the spigot can improve the bending stiffness of the bolted joint.The relative error of the first three order natural frequency is less than 2%for rotor system with or without spigots.The bolted joint with spigots can reduce the maximum vibration amplitude of the rotor system.