Nonlinear response analysis for an aero engine dual-rotor system coupled by the inter-shaft bearing

Lu, Zhenyong; Wang, Xiaodong; Hou, Lei; Chen, Yushu; Liu, Xiyu

doi:10.1007/s00419-018-01501-0

Cited by 38 publications

(13 citation statements)

References 36 publications

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“…e whole system consists of a low-pressure rotor, a highpressure rotor, and six-point supports. e low-pressure compressor blades are very thin and long, the length of which is even longer than the corresponding disk radius, while other blades, such as high-pressure compressor blades, are relatively small compared to the disk (see Figure 1 in reference [29]). So, the effect of the low-pressure compressor blades would be considered most in this section.…”

Section: Modeling Of a Dual-rotor Systemmentioning

confidence: 99%

“…e studies on dynamic behaviours of the dual-rotor coupled with groups of blades and the effects of the blades on the dual-rotor system are relatively few. Some simplified dynamic models of the dual-rotor system were built [27][28][29], which can be well used to investigate the nonlinear response characteristics for aeroengine dual-rotor system. But in these models, the influence of blade parameters was not fully considered.…”

Section: Introductionmentioning

confidence: 99%

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Modeling and Dynamic Characteristics Analysis of Blade-Disk Dual-Rotor System

Zhong²,

Chen

et al. 2020

Complexity

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In this paper, a simplified dynamic model of a dual-rotor system coupled with blade disk is built, and the effects of blade parameters of an aircraft engine on the dynamic characteristics of a dual-rotor system are studied. In the methodology, the blade is simplified as a cantilever structure, and the dynamical equations are obtained by the means of a finite element method. The amplitude-frequency response curves and orbits of shaft centre-vibration shape diagram are used to analyze the effects of blade parameters on dynamic characteristics of a dual-rotor system. The results indicate that the properties of the blades have huge impacts on the critical speed and other dynamic characteristics of the system. With an increase of the length of the blade, the second-order critical speed decreases obviously, but the first-order critical speed is almost invariant; this means that the blades attached on the low-pressure compressor do not affect the first-order critical speed of the dual-rotor system. Meanwhile, note that the high-pressure rotor and low-pressure turbine rotor can excite the first-order resonance of the dual-rotor system, while the low-pressure compressor rotor can only excite the second-order resonance, and then the dynamic model of this six-point support dual-rotor system can further be simplified as a relatively independent single-rotor system with one disk and a four-support dual-rotor system with dual disks.

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Section: Modeling Of a Dual-rotor Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modeling and Dynamic Characteristics Analysis of Blade-Disk Dual-Rotor System

Zhong²,

Chen

et al. 2020

Complexity

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“…Because the beam models are easier to be established and improve computational efficiency. In some models, only the nonlinear bearing forces were considered [6][7][8][9][10][11]. In other models, only nonlinear oil film forces were considered [12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Nonlinear vibration response of a complex aeroengine under the rubbing fault

Liu

Fei

et al. 2021

Nonlinear Dyn

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Rolling bearing and squeeze film damper will introduce structural nonlinearity into the dynamic model of aeroengine. Rubbing will occur due to the clearance reduction design of the engine. The coupling of structural nonlinearity and fault nonlinearity will make the engine present rich vibration responses. This paper aims to analyze the nonlinear vibration behavior of the whole aeroengine including rolling bearing and squeeze film damper under rubbing fault. Firstly, the dynamic model of a turboshaft engine with nonlinear support and rubbing fault is established; The rolling bearing force, the oil film force and the rubbing force are introduced into a dual-rotor-casing model with six support points. Secondly, the linear part of the model is verified by the dynamic characteristics of the three-dimensional finite element model. Finally, the varying compliance vibration, the damping effect and the bifurcation mechanism are analyzed in detail in which the bearing clearance, speed ratio and rubbing stiffness are considered. Results show that the rubbing fault in the nonlinear support case will excite more significant varying compliance vibration in the low-speed region and expand the rotating speed range of the chaotic region in the high-speed region compared with that in the linear support case.

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“…Jin et al [18] presented a two-level model order reduction (MOR) method by combining component mode synthesis (CMS) method and proper orthogonal decomposition (POD) technique to rapidly and accurately analyze dynamic behaviors of the complex dual rotor-bearing system. Lu et al [19] focused on nonlinear response characteristics of a dual-rotor system coupled by the cylindrical roller inter-shaft bearing, and discussed complex nonlinearities affected by the bearing radical clearance, the vertical constant force and the rotating speed ratio. In the above researches, the nonlinearities of the dual-rotor system are caused by the bearings.…”

Section: Introductionmentioning

confidence: 99%

Research nonlinear vibrations of a dual-rotor system with nonlinear restoring forces

Liu

Wang

Luo

2020

J Braz. Soc. Mech. Sci. Eng.

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A dual-rotor system is a core component of an aero-engine, and it is very important to study the nonlinear vibrational characteristics for the aero-engine's development. Based on analyzing structural characteristics of aero-engine's rotors, a novel and more practical dual-rotor dynamic coupling model with nonlinear restoring forces of high-pressure and low-pressure rotors is first proposed. In the linear dynamic coupling model, the coupling critical speed, natural frequencies and vibration responses of the low-pressure rotor are analyzed systematically. In the nonlinear dynamic coupling model, the vibrational characteristics of the dual-rotor system with different nonlinear parameters are simulated numerically based on the nonlinear dynamic theory. The improved shooting method combined the harmonic balance method, and the genetic algorithm is proposed to calculate theoretical solutions of the nonlinear dynamic coupling model. The stability of theoretical solutions is investigated by the Floquet theory. The research results show that the dual-rotor system appears very complicated nonlinear vibrations such as nonlinear multitudinal solutions, double period motions, almost periodic motions and chaotic motions. The transition between nonlinear vibrations occurs suddenly.

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Nonlinear response analysis for an aero engine dual-rotor system coupled by the inter-shaft bearing

Cited by 38 publications

References 36 publications

Modeling and Dynamic Characteristics Analysis of Blade-Disk Dual-Rotor System

Modeling and Dynamic Characteristics Analysis of Blade-Disk Dual-Rotor System

Nonlinear vibration response of a complex aeroengine under the rubbing fault

Research nonlinear vibrations of a dual-rotor system with nonlinear restoring forces

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