Vibration Characteristics of Squeeze Film Damper during Maneuver Flight

Wang, Siji; Liao, Mingfu; Li, Wei

doi:10.1515/tjj-2014-0020

Cited by 10 publications

(4 citation statements)

References 2 publications

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“…Chen et al (2020) was analyzed the effect of SFD on the nonlinear characteristics of the rotor system supported by different supports. Wang et al (2015) and Zhou et al (2013) studied designed and experimental investigations on dynamics of SFD and verified the authenticity of the simulation results with experiments. Childs (2013) studied that depending on the size of the damper, the damper is ineffective and likely to result in large amplitude motion with possible subsynchronous frequencies.…”

Section: Introductionmentioning

confidence: 67%

Dynamic modeling analysis of the gas turbine engine rotor system with SFD

CholUk¹,

Ri²,

ZhunHyok³

et al. 2022

AEAT

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Purpose As a core rotating component of power machinery and working machinery, the rotor system is widely used in the fields of machinery, electric power and aviation. When the system operates at high speed, the system stability is of great importance. To enhance the system stability, squeeze film damper (SFD) is being installed in the rotor system to alleviate vibration. The purpose of this paper is to first classify the rotor system into two types, the dual rotor system and the single rotor system, and to comprehensively and specifically mention the method of generating the dynamic model. Next, based on the establishment of a dynamic model with and without SFD in the rotor system, the optimization design of the rotor system with SFD was carried out using a genetic algorithm. Through sensitivity analysis, SFD clearance, shaft stiffness and oil viscosity were determined as design variables of the rotor system, and the objective function was the minimization of the maximum amplitude of the rotor system with SFD within the operation speed range. Design/methodology/approach In this paper, first, the rotor system was classified into two types, namely, the dual rotor system and the single rotor system, and the method of creating a dynamic model was comprehensively and specifically mentioned. Here, the dynamic model of the rotor system was derived in detail for the single rotor system and the dual rotor system with and without SFD. Next, based on the establishment of a dynamic model with and without SFD in the rotor system, the optimization design of the rotor system with SFD was carried out using a genetic algorithm. The sensitivity analysis of the unbalanced response was carried out to determine the design variables of the optimization design. Through sensitivity analysis, SFD clearance, shaft stiffness and oil viscosity were determined as design variables of the rotor system, and the objective function was the minimization of the maximum amplitude of the rotor system with SFD within the operation speed range. Findings SFD clearance, shaft stiffness and oil viscosity were determined as design variables of the rotor system through sensitivity analysis of the unbalanced response. These three variables are basic factors affecting the amplitude of the rotor system with SFD. Originality/value In the existing studies, only a dynamic model of a single rotor system with SFD was created, and the characteristic values of pure SFD were selected as optimization variables and optimization design was carried out. But in this study, the rotor system was classified into two types, namely, the dual rotor system and the single rotor system, and the method of creating a dynamic model was comprehensively and specifically mentioned. In addition, optimization design variables were selected and optimized design was performed through sensitivity analysis on the unbalanced response of factors affecting the vibration characteristics of the rotor system.

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Section: Introductionmentioning

confidence: 67%

Dynamic modeling analysis of the gas turbine engine rotor system with SFD

CholUk¹,

Ri²,

ZhunHyok³

et al. 2022

AEAT

View full text Add to dashboard Cite

show abstract

“…Xu and Liao [6] studied the vibration response characteristics of a Jeffcott rotor with squeeze film dampers (SFDs) in maneuvering flight environment, and the numerical analysis indicated that the SFDs effectively suppress the transient vibrations caused by maneuvering flight. Based on this, Wang et al [7] designed a rotor test rig that applies timevarying centrifugal force and gyroscopic moment on the rotor system according to maneuvering flight. e influence of the oil film clearance, the unbalanced force, and maneuvering flight parameters on the vibration reduction performance of SFDs was then analyzed.…”

Section: Introductionmentioning

confidence: 99%

Coupled Lateral and Torsional Vibration of Rub‐Impact Rotor during Hovering Flight

Zheng

Chen

Luo

et al. 2021

Shock and Vibration

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When aircraft make a maneuvering during flight, additional loads acting on the engine rotor system are generated, which may induce rub-impact faults between the rotor and stator. To study the rub-impact response characteristics of the rotor system during hovering flight, the dynamic model of a rub-impact rotor system is established with lateral-torsional vibration coupling effect under arbitrary maneuvering flight conditions using the finite element method and Lagrange equation. An implicit numerical integral method combining the Newmark-β and Newton–Raphson methods is used to solve the vibration response. The results indicate that the dynamic characteristics of the rotor system will change during maneuvering flight, and the subharmonic vibrations are amplified in both lateral and torsional vibrations due to maneuvering overload. The form of the rub-impact is different during level and hovering flight conditions: the rub-impact may occur at an arbitrary phase of the whole cycle under the condition of level flight, while only local rub-impact occurs during hovering flight. Under the both flight conditions, the rub-impact has a large effect on the spectral characteristics, periodicity, and stability of the rotor system.

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“…Using the static eccentric condition and vibration reduction mechanism, the parameter range of SFD was designed and the sensitivity of the system to the double frequency excitation ratio was verified [22][23][24]. The design and experimental investigation of the dynamics of SFD was studied, and the reliability of the simulation results was verified through experiments [25,26]. The effect of SFD on the nonlinear characteristics of the rotor system supported by different supports was analyzed [27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Optimization Design Analysis of the Eccentric Rotor System with SFD

CholUk¹,

ZhunHyok²,

ChungHyok³

et al. 2021

J. Vib. Eng. Technol.

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Background Squeeze Film Damper plays an important role in enhancing the dynamic stability of the rotor and damping rotor vibrations and transmitted forces when traversing critical speeds. Depending on how SFD is designed, SFD can reduce the vibration and transmission forces of the rotating system and it can have the opposite effect. In particular, depending on how the single eccentric rotor system with SFD is mathematically accurately modeled and optimize, the stability of the single eccentric rotor system with SFD is further increased. Purpose The purpose of this study is to improve the stability of the single eccentric rotor system by optimizing the variables affecting the vibration characteristics of the single eccentric rotor system with SFD. Methods By using Lagrange function, the dynamic model for the single eccentric rotor system with SFD was comprehensively and specifically mentioned, and the motion equation of centroid path of the single rotor system with SFD was formulated. Next, the optimization design of the single eccentric rotor system with SFD was carried out using a genetic algorithm and MATLAB program. Results After optimizing the design of the single eccentric rotor system with SFD, the amplitude of the single eccentric rotor system with SFD was reduced by 15.2% compared to before the optimization, and the stability of the single eccentric rotor system was further improved. ConclusionIn this paper, we investigated the dynamic modeling method, the motion equation of centroid path and optimization design method of the single eccentric rotor system with SFD. This results will contribute the nonlinear dynamic behaviors of the single eccentric rotor system, and provide a theoretical basis for the analysis of the dynamic modeling, the optimization design, and the nonlinear dynamic characteristic analysis of the dual rotor system.

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Vibration Characteristics of Squeeze Film Damper during Maneuver Flight

Cited by 10 publications

References 2 publications

Dynamic modeling analysis of the gas turbine engine rotor system with SFD

Dynamic modeling analysis of the gas turbine engine rotor system with SFD

Coupled Lateral and Torsional Vibration of Rub‐Impact Rotor during Hovering Flight

Optimization Design Analysis of the Eccentric Rotor System with SFD

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