Dynamical analysis of an elastic ring squeeze film damper-rotor system

Han, Zhifei; Ding, Qian; Zhang, Wei

doi:10.1016/j.mechmachtheory.2018.10.011

Cited by 56 publications

(28 citation statements)

References 19 publications

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“…Compared with current approach, Zhang and Ding (2015) and Han et al (2019) neglected the direct interactions between the journal and the elastic ring. Usually the deflection directly induced by the motion of the journal is much larger than that aroused by film forces; therefore, k was significantly underestimated in Han's model as presented in Figure 6(a).…”

Section: Numerical Resultsmentioning

confidence: 99%

“…Zhang and Ding(2015) obtained the film force and pressure profiles by solving the coupled governing equations of films and elastic ring. Han et al (2019) obtained the force coefficients of the ERSFD and claimed that the non-linearity of the oil film, such as bi-stable phenomenon, is suppressed. However, the direct interactions between the elastic ring and the rigid journal were absent in these investigations.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic characteristics of elastic ring squeeze film damper

Wang

Liu

Zhang

2019

ILT

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Purpose The purpose of this paper is to present a numerical model to investigate the dynamic behavior and force coefficients of a compact squeeze film damper with dual film clearances adjusted by an elastic ring, known as elastic ring squeeze film damper (ERSFD). Design/methodology/approach The governing equations of ERSFD as well as the boundary conditions are obtained based on Reynolds equation. A simplified Greenwood–Williamson model is implemented to investigate the contact behavior between the elastic ring and the journal. The interactions between the films and the elastic ring are achieved by block iterative method. Findings The radial deformation as well as velocity of the elastic ring are captured to illustrate the pressure profiles of the inner and outer films. High-order frequency components related to the number of the boss N are observed on the frequency spectrum of the film force. The force coefficients of the ERSFD are constant for a wider range of non-dimensional whirling radius ε compared with conventional squeeze film damper. Originality/value The force coefficients of the ERSFD are obtained by assuming that the journal center moves in a circular centered orbit. High-order frequency components related to the number of bosses N are observed. These findings may provide helpful materials for the application of the ERSFD.

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Section: Numerical Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dynamic characteristics of elastic ring squeeze film damper

Wang

Liu

Zhang

2019

ILT

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“…Using squeeze film dampers (SFDs) in controlling the vibration of rotor systems has been common in aero engines. Compared with traditional SFDs, the merits of elastic ring squeeze film dampers (ERSFDs) are their small size and light weight (Chen et al, 2016;Han et al, 2019;Lei, 2006;Siew et al, 2002;Wang et al, 2017;Wang et al, 2018;Wang et al, 2019;Zhang & Ding, 2015). In addition, ERSFDs have an enhanced ability to suppress oil film nonlinearity.…”

Section: Introductionmentioning

confidence: 99%

Dynamic analysis of an elastic ring squeeze film damper supported rotor using a semi-analytic method

Han

Zhisai

Zhang

et al. 2020

Engineering Applications of Computational Fluid Mechanics

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To speed up the calculation of dynamic analysis for elastic ring squeeze film dampers (ERSFDs) and investigate the dynamic characteristics of ERSFD-rotor systems, a semi-analytic method (SAM) is proposed for analyzing oil film pressure and force. This method is subsequently verified by comparison with numerical simulation and experimental results. Based on this SAM, an improved dynamic model of an ERSFD-supported rotor is developed by coupling the kinetic equations of the rotor with the determination of elastic deformation. Using this method, the oil coefficients and vibration behaviors of the rotor such as the amplitude-frequency relation and the influence of sudden excitation are investigated. The results reveal that the equivalent oil coefficients and damping ratio of the system can be increased significantly by the adoption of ERSFDs. Therefore, the nonlinear bistable response occasionally occurring in traditional squeeze film damper (SFD) supported rotors is effectively suppressed and the transient vibration process caused by sudden unbalanced excitation action is significantly shortened. The SAM enables one to reduce the computation time of the previous method by more than 90%. Such a reduction greatly improves the computational efficiency.

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“…Therefore researchers had made some improvements to SFD, Chen et al [3] investigated elastic ring squeeze film damper in a spiral bevel gear system to reduce the vibration amplitude and suppress the nonlinear characteristics of the rotor system. Han et al [4] showed that elastic ring squeeze film damper has better dynamical performance than normal SFD. The harmonic balance method (HBM) is one of the most commonly used approaches for analyzing dynamic characteristics of non-linear systems in engineering [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Improved incremental transfer matrix method for nonlinear rotor-bearing system

et al. 2020

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Rotor system supported by nonlinear bearing such as squeeze film damper (SFD) is widely used in practice owing to its wide range of damping capacity and simplicity in structure. In this paper, an improved and effective Incremental transfer matrix method (ITMM) is first presented by combining ITMM and fast Fourier transform (FFT). Afterwards this method is applied to calculate the dynamic characteristics of a Jeffcott rotor system with SFD. The convergence difficulties incurred caused by strong nonlinearities of SFD has been dealt by adopting a control factor. It is found that for the more general boundary problems where the boundary conditions are not at input and output ends of a chain system, the supplementary equation is necessarily added. Additionally, the Floquet theory is used to analyze the stability and bifurcation type of the obtained periodic solution. The semi-analytical results, including the periodic solutions of the system, the bifurcation points and their types, are in good agreement with the numerical method. Furthermore, the involution mechanism of the quasi-periodic and chaotic motions near the first-order translational mode and the second order bending mode of this system is also clarified by this method with the aid of Floquet theory. Keywords Incremental transfer matrix method • Squeeze film damper • Jeffcott rotor system • Bifurcation • Nonlinear characteristics Abbreviations a, a si , a ci Fourier series, dimensionless , Displacement and angular components in the state vector c Damping coefficient of linear elastic support, N ⋅ s/m C Clearance of squeeze film damper, m

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Dynamical analysis of an elastic ring squeeze film damper-rotor system

Cited by 56 publications

References 19 publications

Dynamic characteristics of elastic ring squeeze film damper

Dynamic characteristics of elastic ring squeeze film damper

Dynamic analysis of an elastic ring squeeze film damper supported rotor using a semi-analytic method

Improved incremental transfer matrix method for nonlinear rotor-bearing system

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