Nonlinear response analysis for a dual-rotor system with a breathing transverse crack in the hollow shaft

Lu, Zhenyong; Hou, Lei; Chen, Yushu; Sun, Chuanzong

doi:10.1007/s11071-015-2317-5

Cited by 84 publications

(23 citation statements)

References 25 publications

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“…n s , n d , n b are subscripts of the corresponding subsystems; the number of modes seemed suit for required accuracy. The terms (n b , n d , n s ) = (11,10,8) are good for yield accuracy up to 10 25 Hz in the article. These modes are…”

Section: Theoretical Analysismentioning

confidence: 82%

Exploration of coupled-vibration phenomena in multi-disk rotor with blades with multi-cracks

Chiu

Yang

et al. 2019

Advances in Mechanical Engineering

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Based on previous research results obtained in the authors' laboratory, in this article, we develop, refine, and summarize the disk-transverse, blade-bending, and shaft-torsion coupled-vibration phenomena of a multi-disk rotor with blades with multiple cracks. Three methods are used to explore these phenomena, namely, the finite element method, experimental method, and assumed mode method. The assumed mode method is primary, and the others play subsidiary roles. Some beneficial and interesting results are presented in this article. First, the authors used the assumed mode method and finite element method (ANSYS) to explore and compare the change rules of the natural frequencies and mode shapes in a rotor. Second, it is pointed out how multi-cracks affect the coupled-vibration phenomena of a single-/multi-disk(s) system. Numerical calculation results also show that the crack depth, number of crack blades, as well as the symmetry of the crack blades, affect the natural frequencies. Finally, the experimental results are discussed and the advantages and limitations of using each of the three methods are given. While the experimental measurement method advanced herein may have some limitations, the results should guide future research.

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Section: Theoretical Analysismentioning

confidence: 82%

Exploration of coupled-vibration phenomena in multi-disk rotor with blades with multi-cracks

Chiu

Yang

et al. 2019

Advances in Mechanical Engineering

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“…A great number of studies examined vibration patterns indicating the presence of a fatigue crack in a rotating shaft. In particular, virtually all vibration frequency analyses of cracked rotors with sufficiently deep fatigue cracks [21][22][23] reported highly detectable super-harmonic components (2X, 3X or 4X, etc.) at discrete fractions of a cracked rotor's critical speeds.…”

Section: Introductionmentioning

confidence: 99%

Application of Non-Symmetric Bending Principles on Modelling Fatigue Crack Behaviour and Vibration of a Cracked Rotor

Spagnol

Yang

2020

Applied Sciences

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Many studies on cracked rotors developed crack breathing models that assume that the neutral axis of bending always remains horizontal for simplification. These models may generate significant discrepancies and thus there is a need to develop more sophisticated models to look into the shifting of the neutral axis for a cracked rotor. Herein, a case study on the shifting of the neutral axis for a cracked rotor is firstly performed by using a three-dimensional finite element model to confirm that the neutral axis becomes inclined as the cracked rotor rotates. In response to this finding, non-symmetric bending principles are used to develop a new crack breathing model which has the advantage of being able to numerically calculate the inclination angle of the neutral axis. When compared to an existing crack model in the literature that assumes that the neutral axis remains horizontal (HNA model), the proposed model is relatively less stiff in bending as a result of an overall lower area moment of inertia. Using the harmonic balance method, a two-dimensional finite element vibration model of a cracked rotor was devised by employing the proposed crack breathing model and the HNA model for validation. It can be found that the vibration amplitudes of the first three frequency components are similar between the two models for shallow cracks and significantly differed for deep cracks. This result highlights the potential of the proposed model for modelling and detecting mid-to-late-stage cracks in rotors.

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“…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%

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

Zhong²,

Chen

et al. 2020

Complexity

Self Cite

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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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Nonlinear response analysis for a dual-rotor system with a breathing transverse crack in the hollow shaft

Cited by 84 publications

References 25 publications

Exploration of coupled-vibration phenomena in multi-disk rotor with blades with multi-cracks

Exploration of coupled-vibration phenomena in multi-disk rotor with blades with multi-cracks

Application of Non-Symmetric Bending Principles on Modelling Fatigue Crack Behaviour and Vibration of a Cracked Rotor

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

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