Due to the influence of materials,working environment and other factors,rotating machinery represented by aero-engines may have crack faults during operation.The common crack type is respiratory crack.In order to analyze the in-fluence of the fault on the vibration characteristics of the shafting,based on a certain type of dual-rotor turbofan aero-en-gine,a dual-rotor-support dynamics numerical simulation model including a fan and multiple disks is established.The New-mark-β method is used to numerically simulate the system operating conditions at different crack relative depths and differ-ent speeds.It is found that with the gradual deepening of the crack,the high-frequency component of the rotor become more obvious and the system stability decrease.With the increase of rotational speed,2X and 3X components appear in the sys-tem.The power frequency component increases first and then decreases before and after the first-order critical speed,and the axis trajectory gradually changes from irregular shape to circle.
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