Nonlinear rotordynamics of a MDOF rotor–stator contact system subjected to frictional and gravitational effects

Chipato, Elijah T; Shaw, Alexander D.; Friswell, Michael I.

doi:10.1016/j.ymssp.2021.107776

Cited by 14 publications

(3 citation statements)

References 38 publications

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“…It concerns the contact forces frequency since the structure is composed of 10 blocks. This modulation phenomena is due to the rotation effect [24,25]. In fact, the kinematical quantities are calculated with respect to the fixed frame while the contact forces are connected to the rotating frame.…”

Section: Preample-frictionless Contactmentioning

confidence: 99%

An Adapted Two-Steps Approach to Simulate Nonlinear Vibrations of Solid Undergoing Large Deformation in Contact with Rigid Plane—Application to a Grooved Cylinder

et al. 2022

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Simulating the full dynamic response of a rolling sculpted tire requires not only taking into account various non-linearities but also considering the multi-scale nature of the dynamic response itself. On one hand, there is the macroscopic rolling dynamic behavior that operates around the rotating frequency with relatively high amplitudes. On the other hand, the vibratory response operates in a larger frequency window with relatively low amplitudes. In contrast to a straightforward strategy that consists of using an energy-conserving stable time integrator to predict the multi-scale dynamic response, the proposed strategy is based on a two-steps approach to separate the dynamics operating at different scales. This methodology is applied to simulate the nonlinear vibrations of a hyperelastic solid undergoing large deformations in contact with a rigid plane. In order to illustrate the potential of the proposed numerical method, the nonlinear vibrations response of a grooved cylinder rolling on a rigid plane is investigated.

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Section: Preample-frictionless Contactmentioning

confidence: 99%

An Adapted Two-Steps Approach to Simulate Nonlinear Vibrations of Solid Undergoing Large Deformation in Contact with Rigid Plane—Application to a Grooved Cylinder

et al. 2022

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“…is the input matrix of the contact force and Θ ∈ R is one in the case of contact (d c ≥ 0) and zero otherwise (d c < 0). By rearranging (9) and assuming full rank of M, the state-space representation η = Aη + Bu + NΘ (η, k s , µ), (11) with η ∈ R 72 , u ∈ R 3 , ∈ R 72 , A ∈ R 72×72 , B ∈ R 72×3 , and N ∈ R 72×72 can be achieved. The state vector η is defined as η = d ḋ , and the input vector u is…”

Section: Modeling Of Stator-rotor Contactmentioning

confidence: 99%

“…Experimental validation of the described effects has been undertaken in [8]. A study of the rotordynamics of more complex rotating systems with multiple rotor-stator interface locations is conducted in [9].…”

Section: Introductionmentioning

confidence: 99%

Stator-Rotor Contact Force Estimation of Rotating Machine

Spiller¹,

Söffker²

2021

Automation

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In turbomachines, dry friction resulting from stator–rotor contacts is a severe problem that may degrade lifetime of the machine or even lead to complete failure. Knowledge about the system states and contact forces is beneficial for system monitoring or to prevent contacts through, e.g., active magnetic bearings. In this paper, a nonlinear model is derived that describes the lateral rotor vibrations in the case of contact and no contact. The elastic behavior of the shaft is modeled based on the finite-element method. The contact is described by a dry friction model. An augmented system description is formulated that allows estimation of rotor displacements and contact forces by means of nonlinear filtering approaches like an extended Kalman filter. A simulation study was conducted that explicitly considered the hazardous backward whirl. The suggested approach shows suitable estimation performance related to both state and contact force estimation.

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Dynamic stiffness characteristics of aero-engine elastic support structure and its effects on rotor systems: mechanism and numerical and experimental studies

Zhang

Liu

et al. 2023

Appl. Math. Mech.-Engl. Ed.

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Nonlinear rotordynamics of a MDOF rotor–stator contact system subjected to frictional and gravitational effects

Cited by 14 publications

References 38 publications

An Adapted Two-Steps Approach to Simulate Nonlinear Vibrations of Solid Undergoing Large Deformation in Contact with Rigid Plane—Application to a Grooved Cylinder

An Adapted Two-Steps Approach to Simulate Nonlinear Vibrations of Solid Undergoing Large Deformation in Contact with Rigid Plane—Application to a Grooved Cylinder

Stator-Rotor Contact Force Estimation of Rotating Machine

Dynamic stiffness characteristics of aero-engine elastic support structure and its effects on rotor systems: mechanism and numerical and experimental studies

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