Annihilation of non-stationary vibration of a gas turbine rotor system under rub-impact effect using a nonlinear absorber

Bab, Saeed; Najafi, Mahdi; Sola, Jalal Fathi; Abbasi, Amirhassan

doi:10.1016/j.mechmachtheory.2019.05.005

Cited by 34 publications

(4 citation statements)

References 38 publications

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“…The shaft of length l at rest, assumed to be axisymmetric and massless, is modeled by a bending stiffness f K , a tension stiffness over the half-length  . The damping of the shaft in the direction of the tension is neglected because of the third order before the damping in bending [1,9,16]. The bearings are assumed to be infinitely rigid and blocked laterally but dissipate energy radially by means of an external viscous damping e c in the directions y  and z  .…”

Section: Dynamic Jeffcott Non-linear Rotormentioning

confidence: 99%

Stability and Analysis of Vibrations Bifurcation Based on Dynamic Modeling of a Solar Titan 130 Gas Turbine

Alaoui

Iratni²,

Alshammari

et al. 2022

Strojnícky Časopis - Journal of Mechanical Engineering

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This work is interested in studying the vibrations’ stability in gas turbines, compared to a dynamic model of the Jeffcott rotor, the parameters of the gas turbine will be estimated for the purpose of developing a mathematical model which points out the behavior of the turbine rotor in virtue of the data of actual vibration measurements. The addition of the geometric nonlinearities of the vibrations unveils a supercritical Hopf bifurcation, the unstable modes are repulsed towards a stable limit cycle of small radius. The vibration measurements and analyzes were performed on a gas turbine Solar TITAN 130 type mounted in a gas compression station in Djelfa, Algeria. The turbine was in the operating mode when the vibration parameters were read. Bifurcation monitoring bounds the specific operating ranges, extracts efficiently the dynamic behavior core of the studied turbine and consequently affords a new approach to efficiently dimension the turbine rotor.

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Section: Dynamic Jeffcott Non-linear Rotormentioning

confidence: 99%

Stability and Analysis of Vibrations Bifurcation Based on Dynamic Modeling of a Solar Titan 130 Gas Turbine

Alaoui

Iratni²,

Alshammari

et al. 2022

Strojnícky Časopis - Journal of Mechanical Engineering

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“…Tehrani and Dardel [29] suggested using a tuned mass damper and a nonlinear energy sink to prevent contact. Bab et al [30] modelled a two disk rotating machine and showed that a smooth nonlinear energy sink with rub at the disk positions can decrease the vibration and the inception of rub over a wide range of rotor spin speeds.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear rotordynamics of a MDOF rotor–stator contact system subjected to frictional and gravitational effects

Chipato

Shaw

Friswell

2021

Mechanical Systems and Signal Processing

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“…Dual-rotor systems are widely used in large rotating machines, such as aero-engines [1,2] and gas turbines [3,4]. The dual-rotor system of an aero-engine is composed of several components with different materials to reduce its weight.…”

Section: Introductionmentioning

confidence: 99%

Similitude for the Dynamic Characteristics of Dual-Rotor System with Bolted Joints

Zhang

et al. 2021

Mathematics

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The dual-rotor system has been widely used in aero-engines and has the characteristics of large axial size, the interaction between the high-pressure rotor and low-pressure rotor, and stiffness nonlinearity of bolted joints. However, the testing of a full-scale dual-rotor system is expensive and time-consuming. In this paper, the scaling relationships for the dual-rotor system with bolted joints are proposed for predicting the responses of full-scale structure, which are developed by generalized and fundamental equations of substructures (shaft, disk, and bolted joints). Different materials between prototype and model are considered in the derived scaling relationships. Moreover, the effects of bolted joints on the dual-rotor system are analyzed to demonstrate the necessity for considering bolted joints in the similitude procedure. Furthermore, the dynamic characteristics for different working conditions (low-pressure rotor excitation, high-pressure rotor excitation, two frequency excitations, and counter-rotation) are predicted by the scaled model made of a relatively cheap material. The results show that the critical speeds, vibration responses, and frequency components can be predicted with good accuracy, even though the scaled model is made of different materials.

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Annihilation of non-stationary vibration of a gas turbine rotor system under rub-impact effect using a nonlinear absorber

Cited by 34 publications

References 38 publications

Stability and Analysis of Vibrations Bifurcation Based on Dynamic Modeling of a Solar Titan 130 Gas Turbine

Stability and Analysis of Vibrations Bifurcation Based on Dynamic Modeling of a Solar Titan 130 Gas Turbine

Nonlinear rotordynamics of a MDOF rotor–stator contact system subjected to frictional and gravitational effects

Similitude for the Dynamic Characteristics of Dual-Rotor System with Bolted Joints

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