Investigation of Bending Stiffness for Flange Joint of GTE Rotor

Berne, A. L.; Леонтьев, М. К.; Nizametdinov, F. R.; Romashin, Yu. S.

doi:10.3103/s0025654419020079

Cited by 6 publications

(2 citation statements)

References 2 publications

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“…Zhang et al 24,25 set up a dynamic modeling method for the multi-disk joint rotor, further revealing the dynamic characteristics of the system with multiple faults and investigating the coupling effect of multiple parameters on the stability of the system. Aiming at the flange rotor joints of the turbine in GTE gas generator, Berne et al 26 studied the effect of moment stiffness value on the system’s nonlinear dynamic.…”

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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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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show abstract

“…The tie rod rotor connection is similar to the flange structure; some scholars have carried out research on the modeling of flange structure. Berne et al [19] modeled the stiffness characteristics of a flanged rotor joint and found that its moment stiffness is a nonlinear function of bending moment. The results show that the value of moment stiffness basically depends on the bolt tightening force, axial force and other factors.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Dynamic Characteristics of Rod Fastening Rotor with Preload Relaxation

Li¹,

Zhang²,

Shen³

et al. 2022

Energies

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Compared to ordinary rotor, rod fastening rotor has the advantages of lighter weight, higher strength and easier installation, so it is widely used in gas turbine. However, in the process of a long-term operation, the rod may be deformed due to the influence of alternating load, high temperature and other uncertain factors. In serious cases, it can even lead to a major accident. The discontinuous characteristic of rod fastening rotor leads to great differences in dynamic characteristics compared to ordinary rotor. Based on the Herz contact theory and GW contact model, the contact effect between two discs was studied, and the relationship among the contact load, the distance between two disks and the equivalent bending stiffness was obtained. Findings show the bending stiffness to decrease nonlinearly with the decrease in contact load. The lumped mass method was used to establish the rotor model. The contact effect was considered and the Runge–Kutta method was used to solve the model. Combined with the bifurcation diagram, time domain diagram and spectrum diagram, the influence of contact stiffness on rotor dynamic characteristics was analyzed. The results show that the dynamic characteristics of the rod fastening rotor are rich due to the influence of nonlinear factors. In the case of uniform relaxation, the contact stiffness has different effects on the response state and frequency doubling amplitude of the system at different speeds, which is mainly related to the motion state of the system. In the case of non-uniform relaxation, the degree of relaxation does not affect the motion state of the system, but only changes the amplitude of vibration. The results provide theoretical support for condition monitoring and fault diagnosis of rod fastening rotor.

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Influence of contact interface friction of bolted disk joint on motion stability of rotor-bearing system

Zhang

Shi

et al. 2021

Arch Appl Mech

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Investigation of Bending Stiffness for Flange Joint of GTE Rotor

Cited by 6 publications

References 2 publications

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

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

Nonlinear Dynamic Characteristics of Rod Fastening Rotor with Preload Relaxation

Influence of contact interface friction of bolted disk joint on motion stability of rotor-bearing system

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