Study on the collision dynamics of integral shroud blade for high-pressure turbine in different integral shroud clearance distance

Zhang, Qinglei; Wang, Haoyang; Qin, Jiazheng; Duan, Jianguo

doi:10.1177/0957456521999874

Cited by 3 publications

(4 citation statements)

References 28 publications

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“…Ren et al [ 3 ] investigated a coupled rotor-bearing system with touching and cracking faults to reveal its dynamic behavior. Zhang et al [ 4 ] studied the dynamic response of the turbine blades. Hong et al [ 5 ] studied the touch response of a single-disk rotor system under additional constraints.…”

Section: Introductionmentioning

confidence: 99%

Application of Fault Diagnosis Method Combining Finite Element Method and Transfer Learning for Insufficient Turbine Rotor Fault Samples

Zhang

Qin

et al. 2023

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Deep learning has led to significant progress in the fault diagnosis of mechanical systems. These intelligent models often require large amounts of training data to ensure their generalization capabilities. However, the difficulty of obtaining turbine rotor fault data poses a new challenge for intelligent fault diagnosis. In this study, a turbine rotor fault diagnosis method based on the finite element method and transfer learning (FEMATL) is proposed, ensuring that the intelligent model can maintain high diagnostic accuracy in the case of insufficient samples. This method fully exploits the finite element method (FEM) and transfer learning (TL) for small-sample problems. First, FEM is used to generate data samples with fault information, and then the one-dimensional vibration displacement signal is transformed into a two-dimensional time-frequency diagram (TFD) by taking advantage of the deep learning model to recognize the image. Finally, a pre-trained ResNet18 network was used as the input to carry out transfer learning. The feature extraction layer of the network was trained on the ImageNet dataset and a fully connected layer was used to match the specific classification problems. The experimental results show that the method requires only a small amount of training data to achieve high diagnostic accuracy and significantly reduces the training time.

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Section: Introductionmentioning

confidence: 99%

Application of Fault Diagnosis Method Combining Finite Element Method and Transfer Learning for Insufficient Turbine Rotor Fault Samples

Zhang

Qin

et al. 2023

Entropy

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“…For the study of shrouded blades with gaps, many scholars have established various models with shrouded blades to study the vibration characteristics of the system. [1][2][3][4][5][6][7] Szwedowicz et al 1 proposed a numerical calculation method for the forced vibration of a disk assembly considering the shroud friction effect. Numerical static analysis, free vibration analysis and forced vibration analysis were performed on the shrouded blade.…”

Section: Introductionmentioning

confidence: 99%

“…For the study of shroud gap, the mechanism of collision between twisted shrouded blades with asymmetric gap has been studied, 8 and the collision process of twisted shrouded blades with different gaps has been studied by using LS-DYNA software. 7 It is shown that the effects of the symmetric and asymmetric gap on blade vibration are different, and the motion between blades under asymmetric gap is more complicated.…”

Section: Introductionmentioning

confidence: 99%

“…Guo et al 6 established a simplified model of twisted shrouded blade with tip mass (Timoshenko model), and studied the effects of initial gap, initial preload force, and shroud friction coefficient contact stiffness ratio (ratio of tangential contact stiffness to normal contact stiffness) on the vibration response of the blade. Zhang et al 7 studied the collision process of twisted shrouded blades with different gaps using LS-DYNA software. The collision processes of two-blade systems and three-blade systems with gaps of 0.1–0.5 mm were simulated numerically.…”

Section: Introductionmentioning

confidence: 99%

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Effect of asymmetric shroud gap and shroud friction coefficient on vibration response of shrouded blades

Zhang

Wang

Duan

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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Based on the problem of shroud gap and shroud friction having impact on the blade collision vibration, a three-blade dynamic analysis model considering shroud friction and asymmetric gap is established in the present work. In order to study the effect of asymmetric gap and shroud friction coefficient on the vibration of the twisted shrouded blade in practice. The differential equations of shroud oblique collision between the twisted shrouded blade and adjacent blades were established, and a nonlinear Hertz contact force and an exponentially decaying friction model were used to describe the shroud contact collision force and friction, respectively. Numerical simulation and experiment are used to verify the vibration response of the blade under different gaps. The results show that the shroud movement under the asymmetric gap is more complicated than symmetric gap. The presence of shroud friction causes the passive blades to enter a cyclic motion. And shroud friction coefficient increases will decrease the amplitude of the blade.

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Fatigue life prediction model of Ti-6Al-4V alloy forgings based on forging process parameters

Fang

Liu

et al. 2022

J Mech Sci Technol

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Study on the collision dynamics of integral shroud blade for high-pressure turbine in different integral shroud clearance distance

Cited by 3 publications

References 28 publications

Application of Fault Diagnosis Method Combining Finite Element Method and Transfer Learning for Insufficient Turbine Rotor Fault Samples

Application of Fault Diagnosis Method Combining Finite Element Method and Transfer Learning for Insufficient Turbine Rotor Fault Samples

Effect of asymmetric shroud gap and shroud friction coefficient on vibration response of shrouded blades

Fatigue life prediction model of Ti-6Al-4V alloy forgings based on forging process parameters

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