Abstract
In this paper, the nonlinear crack characteristics of different multi-fault rotor system are analyzed for crack detection based on whirl orbits. The nonlinear crack response can bring instability of the rotating shaft. The identification of the nonlinear characteristics is very important in the crack detection. Considering the interaction of rub-impact forces, time-varying stiffness and nonlinear oil-film forces, the nonlinear dynamic models are established. The numerical simulations put emphasis on the evolution of whirl orbits by studying orbit morphological characteristics near subcritical speed for a rotor system with crack. The bifurcation diagrams, time series and frequency spectra are used to analyze the nonlinear coupled behaviors of the multi-fault rotor system. The typical features and rules of whirl orbits are found in the rotor system with crack. The morphological characteristics of whirl orbit present the number and orientation changes of inner loops during the subcritical speed region, even though multi-fault exist in the rotor system with crack. The experimental whirl orbits of a rotor system with crack during passage through the 1/2 subcritical speeds agree with the theoretical analysis. The orbit morphological characteristics will offer a method for crack detection in multi-fault rotor system.
Published Version
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