Failure analysis of the joint bearing of the main rotor of the Robinson R44 helicopter: A case study

Tan, Deqiang; Li, Rui; He, Qiang; Yang, Xiaoqiang; Zhou, Changchun; Mo, Jiliang

doi:10.1016/j.wear.2021.203862

Cited by 9 publications

(5 citation statements)

References 25 publications

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“…Combined with SEM images (Figs. [12][13][14], it is indicated that the PTFE transfer film is formed well at temperature of 100 ℃.…”

Section: Eds Line Scanning Analysismentioning

confidence: 96%

“…1, between the inner ring and the outer race, a layer of selflubricating PTFE/Kevlar fabric liner is bonded to the outer race. Tan et al [14] analyzed the failure of the joint bearing of the main rotor of a Robinson R44 helicopter, and found that the failure mainly came from wear damage between the inner ring and outer race, and the reason for the wear failure of the bearing was severe damage to the fabric liner, with fracturing and tearing of the fibers. Therefore, studying the tribological properties of PTFE/Kevlar liner is crucial to understanding the service performance of joint bearings and extending their service life [15][16] [17].…”

Section: Introductionmentioning

confidence: 99%

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Influence of high temperature on the tribological properties of hybrid PTFE/Kevlar fabric composite

Tan

et al. 2022

Tribology International

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“…Combined with SEM images (Figs. [12][13][14], it is indicated that the PTFE transfer film is formed well at temperature of 100 ℃.…”

Section: Eds Line Scanning Analysismentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Influence of high temperature on the tribological properties of hybrid PTFE/Kevlar fabric composite

Tan

et al. 2022

Tribology International

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“…A case study of failure analysis of the main rotor joint bearing of the R44 helicopter in service was reported in Ref. [440]. Through a specially designed experimental scheme, it was found that severe wear damage to the fabric liner was the primary cause of the failure, which occurred non-uniformly in circumferential direction.…”

Section: Failure Analysis Multi-dimensional Assessment and Optimizati...mentioning

confidence: 99%

A review of advances in tribology in 2020–2021

Meng

et al. 2022

Friction

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Around 1,000 peer-reviewed papers were selected from 3,450 articles published during 2020–2021, and reviewed as the representative advances in tribology research worldwide. The survey highlights the development in lubrication, wear and surface engineering, biotribology, high temperature tribology, and computational tribology, providing a show window of the achievements of recent fundamental and application researches in the field of tribology.

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“…However, the working conditions of bearings are harsh, which occasionally lead to bearing failure. [16][17][18] The resulting bearing failure is used as an input for the failure model. In axial piston pumps, the rotating assembly is generally submerged in a fluid, making the operating conditions considerably different from those of conventional rotor systems.…”

Section: Introductionmentioning

confidence: 99%

Vibration and stability analyses of rotor–bearing-casing system in an axial piston pump subjected to bearing faults

Wu,

Tang,

Ying

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part K:

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Healthy roller bearings are essential for the safe performance of axial piston pumps. A dynamic failure model of a rotor–bearing-casing system was developed to investigate the effect of bearing damage on the vibration characteristics and stability. This model considers the effect of large-gap circulation on a wet rotor system model, which is closely related to the stirring conditions during actual operation of axial piston pumps. The stator and rotor of the pump were modelled using the centralised parameter technique and finite element method, which were combined to develop the rotor–bearing-casing model. Vibration and stability analyses were performed for the system model with bearing failure, considering the gap annular flow and hydraulic excitation force. The effects of the mass eccentricity, rotational speed, and discharge pressure on the vibration characteristics and stability were analysed under different types of bearing failures. Furthermore, the vibration behaviour of the rotor–bearing-casing system with a bearing fault was measured to validate the established dynamic model. The results indicated that the rotational speed and rotor eccentricity affected the churning and unbalanced effects of the rotor. With an increase in the rotor eccentricity, the rotor first transitioned from nonlinear motion to one-period motion and subsequently to periodic motion. The rotor energy reduction and steady state of the rotor–bearing-casing system were induced by the rotor churning action. As the annular gap decreased, churning losses increased, resulting in a more stable rotor motion.

show abstract

Failure analysis of the joint bearing of the main rotor of the Robinson R44 helicopter: A case study

Cited by 9 publications

References 25 publications

Influence of high temperature on the tribological properties of hybrid PTFE/Kevlar fabric composite

Influence of high temperature on the tribological properties of hybrid PTFE/Kevlar fabric composite

A review of advances in tribology in 2020–2021

Vibration and stability analyses of rotor–bearing-casing system in an axial piston pump subjected to bearing faults

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