Response and stability analysis of a two-spool aero-engine rotor system undergoing multi-disk rub-impact

Investigation on dynamic behaviors of rotor system with looseness and nonlinear supporting

Dynamic characteristic analysis of rotating blade with breathing crack

Modeling and analysis of nonlinear vibrations for a coupling hard-coated ring disc-cylindric shell structure under piecewise-continuous coupling conditions

Dynamic response characteristics of the shaft-blisk-casing system with blade-tip rubbing fault

Modern industrial requirements are continuously demanding better performances and higher rotational speeds from current aero-engines. Under this circumstance, mitigation of rotor vibration is of considerable importance for safe and efficient functioning of rotating machinery. The main objective of this paper is to investigate the application of nonlinear vibration absorber on vibration suppression of a rotor-casing system having imbalance–looseness–rub coupled fault. Due to large vibration amplitude and pedestal looseness, both the geometrical nonlinearity of the rotor shaft and the support nonlinearity are considered in the system. When dealing with blade-casing rub, the initial gap between them is treated to be in non-uniform distribution because of coating inhomogeneity. Then the equations of motion in the presence and absence of nonlinear vibration absorber are respectively obtained according to the Lagrange’s equation. Through numerical simulation, the vibration mitigation of the rotor-casing system is realized in the different conditions of rotational speed and disc eccentricity. Moreover, from the perspective of vibration displacement and impact force, the effects of the nonlinear vibration absorber on the pedestal looseness and blade-casing rub are further discussed. The numerical results reveal that the nonlinear vibration absorber can effectively suppress the nonlinear vibration of the system and alleviate the detrimental influence of the coupled fault in a wide frequency range.

Nonlinear vibration mitigation of a rotor-casing system subjected to imbalance–looseness–rub coupled fault

Using the equation of displacement compatibility, a novel method for describing the contact between pantograph and catenary is proposed in this paper. Then an interaction catenary-pantograph system capable of describing vertical vibration is established. Taking into account the frictional characteristic between pantograph and catenary, the Coulomb model is applied. Based on the continuum mechanics, the partial differential equations of the coupling system are set up. For facilitating numerical simulation, the dynamic equations are further discretized by the Galerkin method, in which the modes of the complicated system are obtained by the finite element method. Therefore, the ordinary differential equations of the coupling system are numerically solved and the corresponding dynamic behaviors at different running speeds are analyzed in terms of waveform. Moreover, the effects of the frictional characteristic on the contact force between pantograph and catenary are discussed in detail. By comparing the results with European standard EN50318, the novel contact method is proved to be valid and accurate.

/pdf/prediction-of-dynamic-characteristics-of-a-pantograph-53smrpnapm.pdf

Prediction of dynamic characteristics of a pantograph-catenary system using the displacement compatibility

Rub-impact of rotor–stator is one of the major problems for stability and safety of a rotating machine. As a result, the characterization of rub-impact force gradually becomes a crucial factor in the dynamic responses prediction of the rotor system. First, the applicable scope of classical rotor–stator rub-impact force models is discussed in this paper. Then, taking a Jeffcott rotor as the research object, rub-impact force models under hard coating, soft coating and general condition are established respectively based on the equivalent linearized method. Finally, dynamic responses of the rotor system are numerically calculated by the linear interpolation method, and the change laws of impact stiffness are further analyzed under different conditions. Then, the effects of the engine coatings on the dynamic characteristics of the rotor system are studied in detail. By means of bifurcation diagram, time histories, whirling orbits, spectrum and impact force diagram, the dynamic variations are revealed. The results suggest that the dynamic responses of system are closely related to the coating hardness. Meanwhile, the full annular rub and partial rub are affected by the coating hardness to a great extent.

Rub-Impact Investigation of a Single-Rotor System Considering Coating Effect and Coating Hardness

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Papers

Nonlinear vibration mitigation of a rotor-casing system subjected to imbalance–looseness–rub coupled fault

Prediction of dynamic characteristics of a pantograph-catenary system using the displacement compatibility

Rub-Impact Investigation of a Single-Rotor System Considering Coating Effect and Coating Hardness