The numerical modeling of rotor–stator rubbing in rotating machinery: a comprehensive review

Prabith, K.; Krishna, I. R. Praveen

doi:10.1007/s11071-020-05832-y

Cited by 53 publications

(19 citation statements)

References 288 publications

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“…Different models produce different transient shocks and have different magnitudes of impact on the rotor, but all studies could illustrate the high susceptibility of rotor systems to transient shocks, leading to changes in operating conditions. In most studies [33,34,[37][38][39], the impact load is often added to the dynamic equation as a function. The response of rotor dynamic is complicated when impact loads are added to the equation.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Responses of the Aero-Engine Rotor System to Bird Strike on Fan Blades at Different Rotational Speeds

Lin

Hedayati

et al. 2021

Applied Sciences

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To study the effect of a bird striking engine fan on the rotor system, a low-pressure rotor system dynamic model based on a real aero-engine structure was established. Dynamic equations were derived considering the case of the bird strike force which transferred to the rotor system. The bird strike force was obtained from the bird strike process simulation in LS-DYNA, where a smoothed particle hydrodynamics (SPH) mallard model was constructed using a computed tomography (CT) scanner, and finite element method (FEM) was used to simulate the bird strike on an actual fan model. The dynamic equations were solved using the Newmark-β method. The effect of rotational speeds on the rotor system dynamics after bird strike was investigated and discussed. Results show that the maximum bird impact force can reach 104 kN at 3772 r/min. Impact time is only 0.06 s, but the bird strike on fan blades lead to a transient shock on the rotor system. Under the action of transient shocks, the rotor system displacement in the horizontal and vertical directions increase sharply, and the closer the mass point is to the fan, the more it is affected; the vibration amplitude at the fan will increase 15 times within 0.1 s of the bird strike and will gradually decrease with the effect of damping. The dynamics of the rotor system changes from a stable single periodic motion to a complex irregular quasi-periodic motion after a bird strike, and the strike force excites the first-order vibrational mode of the rotor system. This phenomenon occurs at all speeds when bird strikes occur. Bird strikes will cause resonance in the rotor system, which may cause damage to the engine. It was also seen that the bird strike force, and hence the effects on the rotor system, increases as the engine rotational speed increases; the peak force is larger and the number of peaks has increased. The impact force at 3772 r/min is 99.5 kN higher than at 836 r/min, and three additional peaks emerged. This effect is more reflected in the amplitude, and the overall vibration characteristics do not change. Combining the bird strike with the rotor dynamics calculation, the dynamic response of the aero-engine rotor system to bird strike is studied at different flight stages, which is of guiding significance for power evaluation of aero engines after bird strike.

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Section: Introductionmentioning

confidence: 99%

Dynamic Responses of the Aero-Engine Rotor System to Bird Strike on Fan Blades at Different Rotational Speeds

Lin

Hedayati

et al. 2021

Applied Sciences

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“…Nevertheless, when using MMSE to extract the fusion features of multi-channel rotating machinery signals, two shortcomings remained. (1) The new multi-variate coarse-grained structure (MCS) of MMSE only considers the single MCS under the scale factor s, ignoring other equally important MCSs. (2) MMSE obtains a new MCS by sliding a window and averaging all the data within, which can cause the amplitude information of multi-channel signals to be ignored [25][26].…”

Section: Entropy-based Feature Extraction Approachmentioning

confidence: 99%

“…Such behavior affects the rotating machinery performance, reliability, and service life, often causing unavoidable economic losses. Thus, it is necessary to implement an effective intelligent fault diagnosis method for both bearings and gears [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

An effective multi-channel fault diagnosis approach for rotating machinery based on multivariate generalized refined composite multi-scale sample entropy

et al. 2021

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Fault diagnosis of critical rotating machinery components is necessary to ensure safe operation. However, the commonly used fault diagnosis methods for rotating machinery are generally based on the single-channel signal processing method, which is not suitable for processing multi-channel signals. Thus, to extract features and carry out the intelligent diagnosis of multi-channel signals, a novel method for rotating machinery fault diagnosis is proposed.Firstly, a novel non-linear dynamics technique, named the multi-variate generalized refined composite multi-scale sample entropy, is presented and applied to extract fusion entropy features of multi-channel signals. Secondly, a practical manifold learning known as supervised isometric mapping is introduced to map the high-dimensional fusion entropy features in a low-dimensional space. In a third step, the Harris hawks optimization-based support vector machine is utilized to achieve intelligent fault recognition. Finally, aiming to verify the effectiveness of the proposed method and present its advantages, it was applied to analyze the rotating machinery system bearing and gear data. The experimental results have shown that the method at hand can accurately identify various bearing and gear faults. Furthermore, in addition to being suitable for multi-channel signal fault diagnosis, it displayed higher recognition accuracy when compared with other multi-channel or single-channel methods.

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“…With the rapid development of high speed and heavy power rotating machinery, detecting and eliminating faults of the rotor system have always been a hot issue in the field of rotating machinery design, research, and development. In the past decades, the research contents of rotor fault detection and elimination include the identification of initial unbalance [4][5][6], the resonance, flutter and damage monitoring of the blade [7][8][9], the looseness [10][11][12], the rotor/stator rubbing [13][14][15][16], crack [17][18][19], and misalignment effects [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

A Dynamic-Balancing Testing System Designed for Flexible Rotor

Zhao

Ren

Liu

et al. 2021

Shock and Vibration

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In this paper, a dynamic-balancing testing system is designed. The innovative feature of the testing system is the dynamic balancing of the rotor system with robustness and high balance efficiency which meets the requirements of engineering application. The transient characteristic-based balancing method (TCBM) interface and the influence coefficient method (ICM) interface are designed in the testing system. The TCBM calculates the unbalance by the transient vibration responses while accelerating rotor operating without trail-weight. The ICM calculates the unbalance by the steady-state vibration responses while the rotor system operates with trail-weight and constant speed. The testing system has the functions of monitoring operations synchronously, measuring and recording the required vibration responses, analyzing the dynamic characteristics, and identifying the unbalance parameters. Experiments of the single disc rotor system are carried out, and the maximum deflection of the measuring point has decreased by 73.11% after balancing by the TCBM interface. The maximum amplitude of the measuring point at 2914 r/min has decreased by 77.74% after balancing by ICM interface, while the maximum deflection during the whole operation has decreased by 70.00%. The experiments prove the effectiveness of the testing system, while the testing system has advantages of convenient and intuitive operation, high balance efficiency, and security.

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The numerical modeling of rotor–stator rubbing in rotating machinery: a comprehensive review

Cited by 53 publications

References 288 publications

Dynamic Responses of the Aero-Engine Rotor System to Bird Strike on Fan Blades at Different Rotational Speeds

Dynamic Responses of the Aero-Engine Rotor System to Bird Strike on Fan Blades at Different Rotational Speeds

An effective multi-channel fault diagnosis approach for rotating machinery based on multivariate generalized refined composite multi-scale sample entropy

A Dynamic-Balancing Testing System Designed for Flexible Rotor

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