Numerical computation of the damping and stiffness coefficients of the classical and magnetorheological squeeze film damper

Ferfecki, Petr; Zapoměl, Jaroslav; Šofer, Michal; Pochylý, František; Fialová, Simona

doi:10.1051/matecconf/201815708001

Cited by 3 publications

(2 citation statements)

References 19 publications

(31 reference statements)

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“…The number of DOF associated with the solved FE model is equal to the 60 and the shaft is discretised by a two-node beam FE (Zapoměl, 2007). The pressure distribution of SFD is determined with the short damper assumption (Ferfecki et al, 2018).…”

Section: Finite Element (Fe) Model Of Rotor System Mounted On Squeezementioning

confidence: 99%

Efficient Numerical Computation of the Steady-State Response and Stability Analysis of the Rotor Systems With Squeeze Film Dampers

Molčan¹,

Ferfecki²,

Zapoměl³

2020

Engineering Mechanics 2020

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The aim of this paper is to demonstrate capabilities of the created numerical procedure, which is based on harmonic balance method. Furthermore, the procedure incorporates the alternating frequency-time domain technique and the arc-length parameterization to solve the steady-state response of nonlinear systems in efficient manner, including unstable branches. The stability of the motion was assessed by two methods: the 2n-pass method and Hill's method. The procedure was verified on an example from literature to prove its sufficient accuracy and subsequently, the procedure was applied on the finite element model of the rotor system mounted on the squeeze film dampers. The carried out computational simulations confirmed that the created procedure is efficient for the strongly nonlinear response and it gives similar results as the time integration.

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Section: Finite Element (Fe) Model Of Rotor System Mounted On Squeezementioning

confidence: 99%

Efficient Numerical Computation of the Steady-State Response and Stability Analysis of the Rotor Systems With Squeeze Film Dampers

Molčan¹,

Ferfecki²,

Zapoměl³

2020

Engineering Mechanics 2020

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“…Only in some cases it is possible to supress effectively the vibration response of a large amplitude or undesirable vibrations, for example using the concept of active vibration control [9] or by semi-active damping devices [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Using Floquet Theory in the Procedure for Investigation of the Motion Stability of a Rotor System Exhibiting Parametric and Self-Excited Vibration

Ferfecki

Zaoral

Zapoměl

2019

Strojnícky Časopis - Journal of Mechanical Engineering

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The computational procedure for investigation vibration stability of a flexible rotor consisting of an asymmetric shaft, one disc, and supported by ball bearings is developed in this work. Lagrange equations of the second kind were used for derivation of the motion equation. The vibration response stability of the Jeffcott-like rotor was studied by means of eigenvalues of a transition matrix. Three different methods for approximation of the transition matrix have been investigated. The presented simulations are focused on studying the influence of parametric excitation produced by the shaft asymmetry and self-excitation vibration caused by the shaft material damping. The numerical results proved the applicability of the developed procedure, which has been verified by the direct integration of the motion equation.

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The Numerical Identification of Basins of Attraction for the Vibration Response of the Rigid Rotor with Squeeze Film Dampers

2023

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The article deals with the computational study of the rigid rotor coupled with squeeze film dampers. Various techniques such as the method of computation of the synchronous response with a circular centred orbit, the harmonic balance method, and the direct time integration method are used to analyse the nonlinear behaviour of the rotor system. The results indicate that the rotor system can exhibit both a synchronous circular response with a large orbit radius and a nonsynchronous response with a quasiperiodic character. However, both responses are undesirable in rotating machinery and should be avoided. The new results are presented to provide insight into the impact of initial conditions on the vibration response via basins of attraction. The simulations show that: (i) the basins of attraction are more sensitive to the choice of the initial velocities than displacements, (ii) the basins of attraction are noticeably dependent on the rotor speed in the region of a nonsynchronous response, and (iii) the border between the basins of attraction can be smooth or without a clear structure. The research brings clear conditions defined by parameters such as the dimensionless SFD constant, unbalance, and rotational speed for the suppression of undesirable nonlinear phenomena. The results suggest that the damper can effectively improve the vibration response of high-speed rotating machinery, but its design must be chosen appropriately.

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Numerical computation of the damping and stiffness coefficients of the classical and magnetorheological squeeze film damper

Cited by 3 publications

References 19 publications

Efficient Numerical Computation of the Steady-State Response and Stability Analysis of the Rotor Systems With Squeeze Film Dampers

Efficient Numerical Computation of the Steady-State Response and Stability Analysis of the Rotor Systems With Squeeze Film Dampers

Using Floquet Theory in the Procedure for Investigation of the Motion Stability of a Rotor System Exhibiting Parametric and Self-Excited Vibration

The Numerical Identification of Basins of Attraction for the Vibration Response of the Rigid Rotor with Squeeze Film Dampers

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