A dynamic model for simulating rubbing between blade and flexible casing

Guo, Xumin; Zeng, Jin; Ma, Hui; Zhao, Chenguang; Yu, Xi; Wen, Bangchun

doi:10.1016/j.jsv.2019.115036

Cited by 48 publications

(6 citation statements)

References 52 publications

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“…And the finite element method is adopted to verify the validity of the model. Some scholars use the Timoshenko beam model, [7][8][9][10][11]13 and others use the Euler-Bernoulli beam model without considering the shear effect. 14,15,17,18 These models are replaced with real blades for finite element simulation analysis.…”

Section: Introductionmentioning

confidence: 99%

“…The effects of parameters such as gap, tip mass, contact angle, and blade normal stiffness of the shrouded blade on the damping characteristics are discussed. Chenguang Zhao 11 established a dynamic model of a rotating cantilever twisted blade based on cantilever beam theory, and a semi-analytical method was used to numerically simulate a rotating blade for a twisted beam with staggered angles. The correctness of the model was verified by comparing the intrinsic frequencies of the model with those of the finite element model.…”

Section: Introductionmentioning

confidence: 99%

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Self-shrouded torsional blade model equivalence and blade vibration response analysis

Zhang,

Wang,

Duan

et al. 2023

Noise & Vibration Worldwide

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In steam turbines, the operation of turbine blades can lead to vibrations, which may result in turbine accidents. Traditional calculation methods are difficult to use due to the complex structure of the torsional blade, and simulation analysis can be time-consuming. Therefore, it is necessary to use the equivalent model instead. Most of the previous studies have simplified the straight blade to a cantilever beam model without considering the shear effect, and used harmonic response analysis to study the vibration of the blade for simulation. The blade body of the torsional blade can be regarded as a torsional variable section beam, and the Timoshenko beam model is the same as the variable section beam. Therefore, the Timoshenko beam model can be regarded as the equivalent of the sheathed torsional blade. Considering the complexity of the calculation of the self-shrouded torsional blade model. According to the theory of Timoshenko beam, the model of the shrouded blade of Timoshenko beam with different torsion angles was established. The first sixth-order modes of the blade model and the vibration response of the adjacent blades under forced vibration are compared, respectively. The results show that the results obtained from the Timoshenko beam blade model considering the torsion angle are closer to the torsional blade model. In addition, the blade vibration response of the same model under different excitation force amplitudes was further compared, and the results showed that the vibration amplitude, acceleration and velocity of the shrouded blade increased with the increase of the excitation force amplitude. However, the magnitude of the inter-shroud collision force and the number of collisions between adjacent blade shrouds are non-linearly related to the amplitude of the excitation force.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Self-shrouded torsional blade model equivalence and blade vibration response analysis

Zhang,

Wang,

Duan

et al. 2023

Noise & Vibration Worldwide

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“…Rotor is a very critical part in areo-engine and other rotating machines, and has been widely applied to mechanical system (Taplak et al, 2013). A rotor–stator rubbing fault is one of the most common in rotating machines and will result in the instability of rotor system, shorten the service life of machines, and even trigger serious accidents (Guo et al, 2020; Mokhtar et al, 2018). To effectively identify rubbing faults and locate rubbing positions, a great many of research scholars have made in-depth studies.…”

Section: Introductionmentioning

confidence: 99%

Identifying rotor-stator rubbing positions based on intrinsic time scale decomposition-hjorth-cepstrum

Chen

Cui

et al. 2022

Journal of Vibration and Control

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To accurately locate rotor–stator rubbing faults in aero-engine, a method combining intrinsic time scale decomposition (ITD), Hjorth parameter and cepstrum analysis has been proposed. First, the method works by decomposing vibration signals from casing into proper rotation components (PRCs) based on ITD; second, calculates the autocorrelation function of each rotation component and the complexity parameters of autocorrelation functions; third, chooses PRCs for signal reconstruction according to complexity from Hjorth parameters and reconstructs the signals based on chosen PRCs; at last, considering that with different positions of rubbing, transfer paths of signals collected by the sensors from the same position are different, cepstrum analysis has been made according to reconstructed signals, and the transfer paths characteristics from cepstrum are taken as feature vectors and inputted into support vector machine for identifying the positions of rotor-stator rubbing faults. The results indicate proposed ITD-Hjorth-Cepstrum method can work well in the identification rate of training and test samples as for the identification rate for an unknown sample.

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“…Guo et al [13] simulated the rub between rotating blade and flexible casing. They proposed a clamped blade model, with the flexible casing simulated as a cylindrical shell.…”

Section: Introductionmentioning

confidence: 99%

Mathematical Validation of Experimentally Optimised Parameters Used in a Vibration-Based Machine-Learning Model for Fault Diagnosis in Rotating Machines

Espinoza-Sepulveda

Sinha

2021

Machines

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Mathematical models have been widely used in the study of rotating machines. Their application in dynamics has eased further research since they can avoid time-consuming and exorbitant experimental processes to simulate different faults. The earlier vibration-based machine-learning (VML) model for fault diagnosis in rotating machines was developed by optimising the vibration-based parameters from experimental data on a rig. Therefore, a mathematical model based on the finite-element (FE) method is created for the experimental rig, to simulate several rotor-related faults. The generated vibration responses in the FE model are then used to validate the earlier developed fault diagnosis model and the optimised parameters. The obtained results suggest the correctness of the selected parameters to characterise the dynamics of the machine to identify faults. These promising results provide the possibility of implementing the VML model in real industrial systems.

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A dynamic model for simulating rubbing between blade and flexible casing

Cited by 48 publications

References 52 publications

Self-shrouded torsional blade model equivalence and blade vibration response analysis

Self-shrouded torsional blade model equivalence and blade vibration response analysis

Identifying rotor-stator rubbing positions based on intrinsic time scale decomposition-hjorth-cepstrum

Mathematical Validation of Experimentally Optimised Parameters Used in a Vibration-Based Machine-Learning Model for Fault Diagnosis in Rotating Machines

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