Vibration responses of rotor systems in diesel multiple units under dynamic spatial misalignments and base motions

Wu, Kun; Liu, Zhiwei; Ding, Qian; Shackleton, Philip; Cattley, Robert; Gu, Fengshou; Ball, Andrew

doi:10.1016/j.jsv.2020.115817

Cited by 10 publications

(3 citation statements)

References 35 publications

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“…The results indicate that the cage fracture leads to the increase in the amplitude of the system. Wu et al [19] researched the random base motions of the rotor system with a misalignment fault in DMU, and the research shows that the nonlinear response of the DSM to the deterministic base motion is faster than the vibration of the rotor. Tuckmantel et al [20] researched the vibration signal of the multi-span rotor structure with clutch under angle misalignment.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Analysis of Three-Rotor System with Hollow Shaft under Clutch Misalignment

Nan,

Wang,

2024

Aerospace

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Rotor system of aviation engines is often made of multiple rotors connected by the clutch. Due to manufacturing and assembly errors, there is a clutch misalignment, including the parallel misalignment and the angle misalignment. This misalignment produces additional torque in the operation of the system, leading to an abnormal increase in its oscillation, which causes the rubbing between the stator and the rotor. The rub-collision poses great harm to the safety and stability of the aero-engine. The analytical model of the rotor system with misalignment and rubbing faults is established, and the influence of the rotational speed, the misalignment, and the rubbing on the nonlinear characteristics of the rotor is investigated. Considering the nonlinear Hertz contact force and bearing gap, the model of the inter-shaft bearing is built; the parallel and angle misalignments of clutch are taken into account to analyze the characteristic frequency of the faults. For raising the thrust-to-weight ratio of aviation engines, the hollow shaft is often adopted, and the effect of the wall thickness for the shaft on the nonlinear vibration of the system is also investigated. It is innovative to study the transfer mechanism from wall thickness to the nonlinear vibrational responses of the overall structure. The result indicates that, with the increase in the wall thickness of the shaft, the second critical rotating speed increases, while the first critical rotating speed is almost unchanged. The characteristic frequencies for the three-rotor system with coupling faults are obtained. Despite intuition, the parallel misalignment can inhibit rub-collision vibration to a certain extent. The research has important reference values for the fault recognition and structural optimization of the three-rotor system.

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Section: Introductionmentioning

confidence: 99%

Dynamic Analysis of Three-Rotor System with Hollow Shaft under Clutch Misalignment

Nan,

Wang,

2024

Aerospace

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“…Kim et al [10] investigated the heat transfer characteristics of a misalignment under purge flow at second stage vane endwall through heat/mass transfer experiments using the naphthalene sublimation method and CFD simulations. Wu et al [11,12] investigated the dynamic responses of dynamic spatially misaligned rotors inside a diesel engine multiple unit system. Aggarwal et al [13] described the incremental inductance method to detect static misalignment of machines.…”

Section: Introductionmentioning

confidence: 99%

Vibration Responses of a Coaxial Dual-Rotor System with Supporting Misalignment

Zhang

Yang

et al. 2021

Applied Sciences

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In order to improve the thrust-weight ratio, modern aeroengines generally adopt a coaxial dual-rotor system. Factors such as manufacturing errors, assembly errors, bearing wear, and structural deformation can cause misalignment failures in a dual-rotor system. Supporting misalignment is one of the common types of misalignments in a dual-rotor system. To analyze the vibration characteristics of misalignment faults, in this study, we aim to build a finite element model of a dual-rotor system with supporting misalignment. The bearing loads caused by supporting misalignment are calculated using the three-bending moment equation method. Bearing loads are introduced into the dynamic model of the dual-rotor system. The influence of supporting misalignment at different bearings on the dynamic characteristics of the rotor system is investigated based on the supporting misalignment model. Studies have shown that supporting misalignment at different bearings has similar effects on the dynamic characteristics of the dual-rotor system. The proposed supporting misalignment model is more adaptable than the coupling misalignment model. It indicates that the damping of a rolling bearing should be considered in the dynamic analysis of a dual-rotor system although the value of the damping is not large. An experimental analysis is carried out. The simulation results are in good agreement with the experimental results.

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“…Establishment of dynamic system equations is the basis for studying the vibration characteristics. Wu et al [10] used the Newmark method to numerically calculate the vibration of the car under basic motion, and the result showed that the system has a good vibration response. ere are many modeling methods for the rotor system.…”

Section: Introductionmentioning

confidence: 99%

Bearing Seat Vibration Modes Undergoing Unbalanced Excitation of Multirotating Drums

Tang

Wang

et al. 2021

Shock and Vibration

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Transmission modes of multiple rotating parts on combine harvester are complex and diverse, which resulted in large vibration and poor stability when the entire machine is harvesting. Aiming at the complex vibration problem of the combine harvester threshing system, this paper established the dynamic response model of the multidrum parallel system under different transmission modes and solved the vibration characteristics of the system. An experiment on the axial unbalance response of the parallel drum system under different transmission modes was carried out. The results show that the internal units of the threshing system form a whole through the transmission system, which causes the unbalanced response of the system to be superimposed on parallel threshing drums, thereby increasing the vibration amplitude. In addition, the change of the transmission mode will cause the vibration transmission path in the system to change greatly, and the boundary conditions of the system will be changed at the same time, which will eventually lead to the change of the unbalanced response characteristics.

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Vibration responses of rotor systems in diesel multiple units under dynamic spatial misalignments and base motions

Cited by 10 publications

References 35 publications

Dynamic Analysis of Three-Rotor System with Hollow Shaft under Clutch Misalignment

Dynamic Analysis of Three-Rotor System with Hollow Shaft under Clutch Misalignment

Vibration Responses of a Coaxial Dual-Rotor System with Supporting Misalignment

Bearing Seat Vibration Modes Undergoing Unbalanced Excitation of Multirotating Drums

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