Research on variational mode decomposition and its application in detecting rub-impact fault of the rotor system

https://hal.archives-ouvertes.fr/hal-01381113/document

Rotor to stator contacts in turbomachines. Review and application

The rotor–stator rubbing in rotating machinery generated as a consequence of rotor imbalance, shaft misalignment, and casing deformation is a potential threat to the machinery that seriously affects its performance. Timely prediction and correction of the rubbing are essential for the prolonged life of the machinery and its overall performance. A complete understanding of the system behavior during interaction is a great challenge for researchers working in the field of rotor dynamics. Rubbing phenomena involve complex contact nonlinearities and associated thermal effects, which makes the analysis very difficult. Research works in this field are started with the analysis of simple two degree-of-freedom models and now dealing with extensive three-dimensional finite element models. This paper provides a comprehensive review of different numerical models of rotor–stator rubbing with respect to their ability in simulating the actual response characteristics. A detailed description of contact modeling is also presented with the advantages and disadvantages of each model. Different methods for solving the numerical models are briefly explained. In addition, a commentary on different emerging techniques of rub identification is also reported. Finally, some informed recommendations on future directions are made by stating what lacks in the current research activities.

The numerical modeling of rotor–stator rubbing in rotating machinery: a comprehensive review

Bifurcation and stability analysis of a nonlinear rotor system subjected to constant excitation and rub-impact

Nonlinear vibration phenomenon of an aircraft rub-impact rotor system due to hovering flight

The nonlinear synchronous full annular rub motion of a flexible rotor induced by the mass unbalance and the contact-rub force with rigid and flexible stator is studied analytically. The nonlinear property is due to the dry friction force between stator and rotor. The exact solutions of the synchronous full annular rub motion and its run speed regions are obtained. The stability of the synchronous full annular rub motion is discussed analytically. The stability criterion and the stability regions of the synchronous full annular rub motion are obtained. A simplified approximate criterion formula for dynamic stability is also derived under the conditions of large impact stiffness, small damping and small friction. The simplified criterion formula can be used conveniently in engineering and matches the real situations of industry.

Analytical study of nonlinear synchronous full annular rub motion of flexible rotor–stator system and its dynamic stability

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Analytical study of nonlinear synchronous full annular rub motion of flexible rotor–stator system and its dynamic stability