Tuning Criteria of Nonlinear Flexible Rotor Mounted on Squeeze Film Damper Using Analytical Approach

Karimulla, Shaik; Dutta, B.K.

doi:10.1007/s42417-020-00229-y

Cited by 8 publications

(5 citation statements)

References 34 publications

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“…SFD generates damping effects through the compression of the inner and outer rings. However, the traditional type of SFD has nonlinear coefficient of dynamic characteristics [3,4]. Wang et al [5] developed a set-mass dynamic model of aero-engine high pressure rotor system and introduced the nonlinear stiffness and damping equations of the SFD into the above model.…”

Section: Introductionmentioning

confidence: 99%

Research on Dynamic Characteristic Coefficients of Integral Squeeze Film Damper

Yan,

Lu,

Pan

et al. 2024

Machines

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Integral squeeze film damper (ISFD) is a new type of structure that appeared on the basis of traditional squeeze film damper (SFD). Since the oil film in ISFD is a segmented structure without annular flow, the nonlinearity of the oil film force has been improved to a great extent. The dynamic characteristic coefficients of ISFD have a close relationship with its damping performance. This work investigates and studies the dynamic characteristic parameters of ISFD by means of numerical analysis and experimental validation techniques in order to examine the dynamic features and unveil the damping mechanism. The ISFD solid and fluid analysis models are created, and the computational fluid dynamics (CFD) and mechanical performance analyses are completed. The force acting on the ISFD’s S-type elastomer under excitation conditions is revealed in the mechanical property analysis, and the flow characteristics of the internal oil film are investigated in the CFD analysis. It is discovered that the ISFD has good linear damping and stiffness characteristics, and numerical analytical values for the ISFD’s damping and stiffness coefficients are obtained. By constructing a bi-directional excitation test rig, the experimental values of the ISFD stiffness coefficient and damping coefficient are determined. These values are in close agreement with the results of the numerical analysis, confirming the accuracy of the ISFD’s numerical analysis conclusions.

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Section: Introductionmentioning

confidence: 99%

Research on Dynamic Characteristic Coefficients of Integral Squeeze Film Damper

Yan,

Lu,

Pan

et al. 2024

Machines

View full text Add to dashboard Cite

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“…In Ref. [11], modified Reynold equation with short damper approximation was used to derive the SFD forces for 2π-film. Groves [12] proposed the use of Chebyshev polynomial fits to identify a finite difference (FD) solution of the incompressible Reynolds equation.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Dynamic Characteristics of Small-Scale and Low-Stiffness Ring Squeeze Film Damper-Rotor System

et al. 2022

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Rotor machinery supports are susceptible to fracture arising from multi-period or irregular transient vibration and even the inconspicuous fatigue phenomenon. The novel dynamic model of a rotor mounted on the floating ring squeeze film damper (SFD) was developed. The proposed SFD implements low stiffness and small scale to overcome the deficiency. Based on the theory of hydrodynamic lubrication, the Reynolds equations on the working principle of the floating ring are established. Then, the dynamic characteristics of the rotor system during maneuvers, with the floating ring SFD supports, are subsequently examined by adopting the finite difference method. In addition, the oil film whirl mechanism of the floating ring SFD is demonstrated according to the transient analysis of the fluid–structure interaction model. The results of the SFD simulation reveal that, with increasing eccentricity ratio, both the inner and outer oil film pressure tend to be larger due to the shrinkage of the effective coverage of oil film. The maximum oil film pressure and bearing capacity increase nonlinearly within a certain eccentricity ratio range. Through the comparisons of the results, the vibration suppression effects of the proposed SFD are analyzed. This work will provide the practical reference for the dynamic design of the rotor support system.

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“…The driveline always adopts multiple segments with hollow thin-walled tube structures. It is frequently imposed on supercritical operating conditions [2,3]. When the shaft passes through the resonance region, excessive vibration can be avoided by using a dry friction damper [4].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Characteristics of a Segmented Supercritical Driveline with Flexible Couplings and Dry Friction Dampers

et al. 2021

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Helicopter tail rotors adopt a segmented driveline connected by flexible couplings, and dry friction dampers to suppress resonance. Modeling for this system can provide a basic foundation for parameter analysis. In this work, the lateral-torsional vibration equation of the shaft with continuous internal damping is established. The static and dynamic effects caused by flexible diaphragm couplings subject to parallel and angular misalignment is derived. A novel dual rub-impact model between the shaft and dry friction damper with multiple stages is proposed. Finally, a model of a helicopter tail rotor driveline incorporating all the above elements is formulated. Numerical simulations are carried out by an improved Adams–Bashforth method following the design flowchart. The dynamics of multiple vibration suppression, and the static and dynamic misalignment are analyzed to illustrate the accuracy and characteristics of the model. The coeffect of the rub impact and the misalignment on shafts and dampers are presented through the results of simulation and experiment. It provides an accurate and comprehensive mathematical model for the helicopter driveline. Response characteristics of multiple damping stages, static and dynamic misalignment, and their interaction are revealed.

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Tuning Criteria of Nonlinear Flexible Rotor Mounted on Squeeze Film Damper Using Analytical Approach

Cited by 8 publications

References 34 publications

Research on Dynamic Characteristic Coefficients of Integral Squeeze Film Damper

Research on Dynamic Characteristic Coefficients of Integral Squeeze Film Damper

Analysis of Dynamic Characteristics of Small-Scale and Low-Stiffness Ring Squeeze Film Damper-Rotor System

Dynamic Characteristics of a Segmented Supercritical Driveline with Flexible Couplings and Dry Friction Dampers

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