Experimental investigation and analytical modeling for blade-casing rubbing force

Zeng, Zhenkun; Zhang, Dayi; Tong, Ruoyun; Xu, Huining

doi:10.1016/j.ymssp.2021.108548

Cited by 9 publications

(2 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Single-point rub-impact fault is the main type in the early stage [26,27]. Large-sized rotating machines are often structured by rotors, wheels and blades.…”

Section: Hankel Matrix Construction Based On the Periodicity Of Rubbi...mentioning

confidence: 99%

A new method of noise reduction grounded on the Hankel matrix and its application in rubbing fault diagnosis

Zhang,

Yu,

Feng

et al. 2024

Meas. Sci. Technol.

View full text Add to dashboard Cite

In processing signals with singular value decomposition (SVD), one of the keys lies in building an appropriate Hankel matrix from signals. To address the difficulty in extracting the feature information of rubbing faults between rotor and stator, by taking advantage of the nature of rubbing fault information closely related to the rotation period of equipment, a new method of SVD is presented according to the Hankel matrix built from the periodicity of rotation machine. Firstly, with the periodicity of rub-impact fault as the basis, the interval step size between Hankel vectors was determined to self-adaptively build a Hankel matrix of signal. Secondly, the newly-built Hankel matrix was denoised through singular value differential spectrum (SVDS). Thirdly, to reduce the loss of data as much as possible, a strategy was proposed to rebuild signals according to the first and last rows of denoised signals. Fourthly, features of rubbing faults were extracted according to the frequency spectrum of reconstructed signals and faults were identified. To verify the applicability and effectiveness of presented algorithm, various types of simulation signals and tester signals from different states were brought in; meanwhile, the presented algorithm was compared with a variety of classical methods. The result proves that the proposed method not only can effectively restrain noise interference, but also highlight fault feature information and correctly identify rub-impact faults.

show abstract

“…Single-point rub-impact fault is the main type in the early stage [26,27]. Large-sized rotating machines are often structured by rotors, wheels and blades.…”

Section: Hankel Matrix Construction Based On the Periodicity Of Rubbi...mentioning

confidence: 99%

A new method of noise reduction grounded on the Hankel matrix and its application in rubbing fault diagnosis

Zhang,

Yu,

Feng

et al. 2024

Meas. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…Using the finite element approach, Ma et al [8] developed an excellent model of a shaft-disk-blade system and then discussed the impact of blade stagger angles, speeds, and casing stiffness on rubbing-induced dynamic phenomena. Zeng et al [9] proposed an analytical model for blade-casing rubbing force, and the established model was verified using a dedicated test rig. Colaïtis et al [10] presented a numerical simulation strategy based on the harmonic balance method to qualitatively characterize the blade dynamic features when blade casing contact occurs.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Analysis of a Bolted Joint Rotor-Bearing System with a Blade–Casing Rubbing Fault

Wen

Zhu

et al. 2023

Processes

View full text Add to dashboard Cite

Bolted joints are widely used in aeroengine rotor systems to connect multiple components into an integrated structure and provide sufficient stiffness. The mechanical properties of a bolted joint have a significant effect on rotor dynamics. For modern aeroengine designs, the blade-tip clearance is gradually reduced to improve efficiency, which may lead to rubbing damage and affect safe operation. The mechanical properties of a bolted joint change significantly during the blade–casing rubbing process and influence the dynamic properties of the rotor system. Based on the finite element (FE) modeling method, a 15-node bolted joint rotor system model is established in this paper, in which the bolted joint is represented by a 2-node joint element, and the blade–casing rubbing force is considered. The Newmark method is used to solve the motion equations. The dynamic model is validated by comparing the frequency response characteristics for different numbers of blades with the results provided in other published studies. Based on the established model, the effects of the rotational speed, number of blades, and rubbing stiffness on the dynamic responses, normal rubbing forces, and bending stiffness of the bolted joint are evaluated by numerical simulation. The results show that the response amplitude and bending stiffness of the bolted joint change significantly under blade–casing rubbing faults, and the mean value of the vibration response deviates significantly from 0 as the number of blades increases. Meanwhile, the amplitude of the frequency component fVC and the maximum value of the normal rubbing force also increase as the number of blades increases. The main contribution of this paper is the establishment of a new model for a bolted joint rotor system, considering the time-varying bending stiffness of the bolted joint and the blade–casing rub fault, comparing the simulation results to obtain some general results bridging the current research gap. Meanwhile, the numerical results in this paper can provide a cognitive basis for the blade–casing rubbing fault mechanism of a bolted joint rotor system under the influence of speed, number of blades, and rubbing stiffness. The nonlinear dynamic characteristics observed in the present paper can be applied to the blade–casing rubbing fault diagnosis of turbomachines.

show abstract

Transient state analysis of a rub-impact rotor system during maneuvering flight

WANG,

LIU,

QIN

et al. 2024

Chinese Journal of Aeronautics

View full text Add to dashboard Cite

Experimental investigation and analytical modeling for blade-casing rubbing force

Cited by 9 publications

References 27 publications

A new method of noise reduction grounded on the Hankel matrix and its application in rubbing fault diagnosis

A new method of noise reduction grounded on the Hankel matrix and its application in rubbing fault diagnosis

Dynamic Analysis of a Bolted Joint Rotor-Bearing System with a Blade–Casing Rubbing Fault

Transient state analysis of a rub-impact rotor system during maneuvering flight

Contact Info

Product

Resources

About