Modal characteristics analysis for a flexible rotor with non-smooth constraint due to intermittent rub-impact

Jiang, Hong; Yu, Pingchao; Zhang, Dayi; Liang, Zhichao

doi:10.1016/j.cja.2018.01.003

Cited by 30 publications

(4 citation statements)

References 30 publications

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“…The boundary conditions of BHS FE model is shown in Figure 8 . The 4-node shell elements is adopted to divide the mesh in the case of large deformation analysis [ 41 ]. The impactor with initial velocity of 10 m/s and the weight of 500 kg is set as rigid body.…”

Section: Numerical Simulationsmentioning

confidence: 99%

Investigation on Microstructure of Beetle Elytra and Energy Absorption Properties of Bio-Inspired Honeycomb Thin-Walled Structure under Axial Dynamic Crushing

Hao

2018

Nanomaterials

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The beetle elytra requires not only to be lightweight to make a beetle fly easily, but also to protect its body and hind-wing from outside damage. The honeycomb sandwich structure in the beetle elytra make it meet the above requirements. In the present work, the microstructures of beetle elytra, including biology layers and thin-walled honeycombs, are observed by scanning electron microscope and discussed. A new bionic honeycomb structure (BHS) with a different hierarchy order of filling cellular structure is established. inspired by elytra internal structure. Then the energy absorbed ability of different bionic models with the different filling cell size are compared by using nonlinear finite element software LS-DYNA (Livermore Software Technology Corp., Livermore, CA, USA). Numerical results show that the absorbed energy of bionic honeycomb structures is increased obviously with the increase of the filling cell size. The findings indicate that the bionic honeycomb structure with second order has an obviously improvement over conventional structures filled with honeycombs and shows great potential for novel clean energy absorption equipment.

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Section: Numerical Simulationsmentioning

confidence: 99%

Investigation on Microstructure of Beetle Elytra and Energy Absorption Properties of Bio-Inspired Honeycomb Thin-Walled Structure under Axial Dynamic Crushing

Hao

2018

Nanomaterials

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“…Researchers have strived to understand the rub-impact fault, for example, exploring the fault mechanism [8][9][10], the fault feature extraction method [11][12][13], source localization [14,15], and intelligent fault diagnosis [16,17], etc. These studies contributed to the development of rub-impact fault diagnosis and to practical applications.…”

Section: Introductionmentioning

confidence: 99%

Study on a Fault Mitigation Scheme for Rub-Impact of an Aero-Engine Based on NiTi Wires

Pan

Liu³

et al. 2022

Sensors

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The aim of this study was to solve the frequently occurring rotor-stator rub-impact fault in aero-engines without causing a significant reduction in efficiency. We proposed a fault mitigation scheme, using shape memory alloy (SMA) wire, whereby the tip clearance between the rotor and the stator is adjusted. In this scheme, an acoustic emission (AE) sensor is utilized to monitor the rub-impact fault. An active control actuator is designed with pre-strained two-way SMA wires, driven by an electric current via an Arduino control board, to mitigate the rub-impact fault once it occurs. In order to investigate the feasibility of the proposed scheme, a series of tests on the material properties of NiTi wires, including heating response rate, ultimate strain, free recovery rate, and restoring force, were carried out. A prototype of the actuator was designed, manufactured, and tested under various conditions. The experimental result verifies that the proposed scheme has the potential to mitigate or eliminate the rotor-stator rub-impact fault in aero-engines.

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“…Neriya et al [5] simulated the geared rotor system's bending-torsional coupled vibration by the finite element method. This method was used extensively by scholars because it could simulate the effect of multiple factors such as elastic shaft and bearing parameters [6][7][8][9]. Similarly, Li [10] and Yavuz [11] utilized the finite element method to study the dynamic properties of the coupled system with spiral bevel gears.…”

Section: Introductionmentioning

confidence: 99%

“…This method was used extensively by scholars because it could simulate the effect of multiple factors such as elastic shaft and bearing parameters. 6–9 Similarly, Li and Hu 10 and Yavuz et al. 11 utilized the finite element method to study the dynamic properties of the coupled system with spiral bevel gears.…”

Section: Introductionmentioning

confidence: 99%

Modeling and dynamic analysis of spiral bevel gear coupled system of intermediate and tail gearboxes in a helicopter

Zhu

Chen

Zhu

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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The coupled dynamic model of the intermediate and tail gearboxes’ spiral bevel gear-oblique tail shaft-laminated membrane coupling was established by employing the hybrid modeling method of finite element and lumped mass. Among them, the dynamic equation of the shaft was constructed by Timoshenko beam; spiral bevel gears were derived theoretically by the lumped-mass method, where the effects of time-varying meshing stiffness, transmission error, external imbalance excitation and the like were considered simultaneously; laminated membrane coupling was simplified to a lumped parameter model, in which the stiffness was obtained by the finite element simulation and experiment. On this basis, the laminated membrane coupling and effects of several important parameters, including the unbalance value, tail rotor excitation, oblique tail shaft’s length and transmission error amplitude, on the system’s dynamic characteristics were discussed. The results showed that the influences of laminated membrane coupling and transmission error amplitude on the coupled system’s vibration response were prominent, which should be taken into consideration in the dynamic model. Due to the bending-torsional coupled effect, the lateral vibration caused by gear eccentricity would enlarge the oblique tail shaft’s torsional vibration; similarly, the tail rotor’s torsional excitation also varies the lateral vibration of the oblique tail shaft. The coupled effect between the eccentricity of gear pairs mainly hit the torsional vibration. Also, as the oblique tail shaft’s length increased, the torsional vibration of the oblique tail shaft tended to diminish while the axis orbit became larger. The research provides theoretical support for the design of the helicopter tail transmission system.

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Modal characteristics analysis for a flexible rotor with non-smooth constraint due to intermittent rub-impact

Cited by 30 publications

References 30 publications

Investigation on Microstructure of Beetle Elytra and Energy Absorption Properties of Bio-Inspired Honeycomb Thin-Walled Structure under Axial Dynamic Crushing

Investigation on Microstructure of Beetle Elytra and Energy Absorption Properties of Bio-Inspired Honeycomb Thin-Walled Structure under Axial Dynamic Crushing

Study on a Fault Mitigation Scheme for Rub-Impact of an Aero-Engine Based on NiTi Wires

Modeling and dynamic analysis of spiral bevel gear coupled system of intermediate and tail gearboxes in a helicopter

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