As the core rotating component of high-end turbomachinery such as gas turbines and aero-engines, rod-fastening rotor systems exhibit complex nonlinear dynamic characteristics. This manuscript focuses on investigating the parameter influence mechanisms in rod-fastening rotors under coexisting contact-impact and crack faults. A dynamic model is established to simulate the system behavior under variations of bifurcation parameters (eccentricity, crack depth, radial clearance and so on). Based on bifurcation characteristics and Maximum Lyapunov Exponent analysis, it is revealed that the system demonstrates parameter-dependent transitions between periodic, quasi-periodic, and chaotic motions, with significant correlations existing between system parameters and dynamic responses. This research deepens the exploration of rotor  dynamic characteristics and enhances the capabilities for fault prediction and diagnosis in gas turbine systems.
 

Bifurcation parameter, Rod-fastening rotors, Crack, Contact-impact, Dynamic behavior