Coupling vibration characteristics of the shaft-disk-drum rotor system with bolted joints

Yang, Tao; Ma, Hui; Qin, Zhaoye; Guan, Hong; Xiong, Qian

doi:10.1016/j.ymssp.2021.108747

Cited by 53 publications

(5 citation statements)

References 43 publications

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“…In order to reduce the weight, the shaft in the aero-engine usually is a hollow shaft with a drum structure [26], and the whole rotor shaft is mainly subjected to transverse loads (loads in the OYZ). Therefore, beam models are commonly used in engineering to simulate rotor shafts in aero-engine rotor systems.…”

Section: Shaft Elementmentioning

confidence: 99%

Dynamic Behavior of Twin-Spool Rotor-Bearing System with Pedestal Looseness and Rub Impact

Zhang,

Li,

et al. 2024

Applied Sciences

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The twin-spool rotor-bearing system plays a crucial role in the aero-engine. The potential manufacturing defect, assembly error, and abnormal working loads in the rotor-bearing system can induce multiple rotor failures, such as bolt looseness and rub impact. However, the prediction of the fault rotor dynamic behavior for the aero-engine remains a difficult frontier in numerical modeling. We present a dynamic model of the twin-spool rotor-bearing system, the failure model of bearing seat loosening, and the failure model of rub impact by using second-type Lagrangian equations, finite element theory, and the Timoshenko beam theory. In particular, to improve the accuracy of the numerical model, the rotating speed control equation and the actual aero-engine parameter are taken into account. An analysis is conducted on the impact of critical failure parameters, such as looseness stiffness and rub impact initial gap, on the vibration behaviors of the essential components of the twin-spool rotor system and on the entire engine. Additionally, this paper examines the twin-spool rotor-bearing system affected by looseness–rub coupled failures. The obtained conclusions can serve as a theoretical foundation for optimizing the structure and diagnosing faults in the aero-engine rotor system.

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Section: Shaft Elementmentioning

confidence: 99%

Dynamic Behavior of Twin-Spool Rotor-Bearing System with Pedestal Looseness and Rub Impact

Zhang,

Li,

et al. 2024

Applied Sciences

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“…The bending stiffness of the bolted joint should be determined using the following equation when the bending stiffness approaches the second bending stage [39]:…”

Section: ( )mentioning

confidence: 99%

Dynamic Analysis of a Bolted Joint Rotor-Bearing System with a Blade–Casing Rubbing Fault

Wen

Zhu

et al. 2023

Processes

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Bolted joints are widely used in aeroengine rotor systems to connect multiple components into an integrated structure and provide sufficient stiffness. The mechanical properties of a bolted joint have a significant effect on rotor dynamics. For modern aeroengine designs, the blade-tip clearance is gradually reduced to improve efficiency, which may lead to rubbing damage and affect safe operation. The mechanical properties of a bolted joint change significantly during the blade–casing rubbing process and influence the dynamic properties of the rotor system. Based on the finite element (FE) modeling method, a 15-node bolted joint rotor system model is established in this paper, in which the bolted joint is represented by a 2-node joint element, and the blade–casing rubbing force is considered. The Newmark method is used to solve the motion equations. The dynamic model is validated by comparing the frequency response characteristics for different numbers of blades with the results provided in other published studies. Based on the established model, the effects of the rotational speed, number of blades, and rubbing stiffness on the dynamic responses, normal rubbing forces, and bending stiffness of the bolted joint are evaluated by numerical simulation. The results show that the response amplitude and bending stiffness of the bolted joint change significantly under blade–casing rubbing faults, and the mean value of the vibration response deviates significantly from 0 as the number of blades increases. Meanwhile, the amplitude of the frequency component fVC and the maximum value of the normal rubbing force also increase as the number of blades increases. The main contribution of this paper is the establishment of a new model for a bolted joint rotor system, considering the time-varying bending stiffness of the bolted joint and the blade–casing rub fault, comparing the simulation results to obtain some general results bridging the current research gap. Meanwhile, the numerical results in this paper can provide a cognitive basis for the blade–casing rubbing fault mechanism of a bolted joint rotor system under the influence of speed, number of blades, and rubbing stiffness. The nonlinear dynamic characteristics observed in the present paper can be applied to the blade–casing rubbing fault diagnosis of turbomachines.

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“…For instance, Hong et al 14 derived a bolted joint rotor model considering the breathing effect induced by the nonuniform preload, analyzing the effect of the nonuniform preload on the combination resonances of the system. Aiming at the rotating-flexible shaft-disk-drum (SDR) system with bolted joints, Yang et al 15 explored the effect of rotating speed, the number of bolts, and joint stiffness on the natural character of the system. Zhao et al 16 presented a finite element model of a tie-rod dual-disk rotor system using the thin layer element and indicated that preload was the main contributor to multiple combined frequency components.…”

Section: Introductionmentioning

confidence: 99%

A parametric study of a bolted joint rotor-bearing system with an unbalanced offset disk

Zhu,

Li,

Wen

et al. 2024

Proceedings of the Institution of Mechanical Engineers, Part C:

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The turbine disk is the core component of an aero-engine whose position and unbalanced force seriously affect the vibration stability of the rotor system. Ignoring the influence of the offset disk may result in discrepancies between real-world scenarios and numerical simulation results. The present work aims to explore the nonlinear dynamic characteristics of rotor systems under the coupling of bolted joint and offset disk effect, as well as the influence of offset disk position and its unbalanced force on the system dynamic behavior and bending stiffness of bolted joint also investigated. The governing equations of a bolted joint rotor-bearing system with an offset disk were established based on the finite element method and derived as a dimensionless expression in the first. Then, the Newmark method was employed for the numerical solution of the motion equations, and then a bifurcation analysis of the rotor system and the evolution of bending stiffness for the bolted joint was studied. Next, by comparing the frequency-amplitude diagrams, bifurcation diagrams, time history, shaft obits, and bending stiffness diagrams of the bolted joint, the effect of the offset disk position and its unbalanced force on the nonlinear system dynamic was revealed. Finally, an experimental study was carried out to verify the numerical result using the bolted joint rotor test rig with an offset disk. The analysis result of the present work can provide theoretical guidance for structure design and stability analysis on the aero-engine.

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Coupling vibration characteristics of the shaft-disk-drum rotor system with bolted joints

Cited by 53 publications

References 43 publications

Dynamic Behavior of Twin-Spool Rotor-Bearing System with Pedestal Looseness and Rub Impact

Dynamic Behavior of Twin-Spool Rotor-Bearing System with Pedestal Looseness and Rub Impact

Dynamic Analysis of a Bolted Joint Rotor-Bearing System with a Blade–Casing Rubbing Fault

A parametric study of a bolted joint rotor-bearing system with an unbalanced offset disk

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