Numerical and experimental investigation on the vibro-impact responses analysis of shrouded blade

Cui, Can; Ma, Hui; Jin, Yezhuang; Xie, Fangtao; Yang, Tong; Liu, Shiyu

doi:10.1177/1461348418811456

Cited by 6 publications

(6 citation statements)

References 38 publications

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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%

“…Ma et al 3 simplified the shrouded blade as a cantilevered Euler-Bernoulli beam with tip mass at the free end and analyzed the effects of symmetric and asymmetric shroud gap, rotational speed and aerodynamic amplitude on the dynamic characteristics of the shrouded blade using numerical method. Cui et al 4 established a finite element model of a shrouded blade and analyzed the collision vibration response between adjacent blades. Through the finite element model and experiment, the effects of parameters such as shroud gap, excitation force amplitude and excitation frequency on the collision vibration response were analyzed.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, for the study of twisted shrouded blades, some scholars have established the Timoshenko model with tip mass based on twisted shrouded blades. [4][5][6] The model was also verified by using the finite element method and the vibration characteristics of the model were studied. For the study of shroud friction, some scholars have established different models to study the shroud friction, [10][11][12]15 and studied the friction dynamics of the bending-torsional coupled vibration of the shrouded blade using numerical method.…”

Section: Introductionmentioning

confidence: 99%

“…For the study of twisted shrouded blades, many scholars have studied different equivalent models to improve the computational efficiency and then adopted finite element analysis to study the vibration response of the blade. [3][4][5][6] However, this may often lead to low computational accuracy, and some scholars often have only theoretical basis. The corresponding experimental verification is lacking.…”

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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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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:

View full text Add to dashboard Cite

show abstract

“…For shrouded blades, the experimental validation is usually performed in test rigs where one blade is put in contact with supports that simulate the adjacent blades. Numerous experimental test rigs were developed where the dynamic response of the shrouded blades in contact was measured [7][8][9][10][11][12][13]. These studies emphasized on the measurement of displacements or accelerations along with the excitation forces to compute and analyze the effects of shroud contacts on vibration amplitudes and resonant frequencies.…”

Section: Introductionmentioning

confidence: 99%

Design and Calibration of a Tri-Directional Contact Force Measurement System

2021

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In low pressure turbine stages, adjacent blades are coupled to each other at their tip by covers, called shrouds. Three-dimensional periodic contact forces at shrouds strongly affect the blade vibration level as energy is dissipated by friction. To validate contact models developed for the prediction of nonlinear forced response of shrouded blades, direct contact force measurement during dynamic tests is mandatory. In case of shrouded blades, the existing unidirectional and bi-directional contact force measurement methods need to be improved and extended to a tri-directional measurement of shroud contact forces for a comprehensive and more reliable validation of the shroud contact models. This demands an accurate and robust measurement solution that is compatible with the nature and orientation of the contact forces at blade shrouds. This study presents a cost effective and adaptable tri-directional force measurement system to measure static and dynamic contact forces simultaneously in three directions at blade shrouds during forced response tests. The system is based on three orthogonal force transducers connected to a reference block that will eventually be put in contact with the blade shroud in the test rig. A calibration process is outlined to define a decoupling matrix and its subsequent validation is demonstrated in order to evaluate the effectiveness of the measurement system to measure the actual contact forces acting on the contact.

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