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.
bolted joint with spigotsbending stiffnesscontact interfaceassembly process parametervibration characteristics
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