Article 8218

Title of the article

THE PROCESS OF TURNING THE INSERT WITH THE SPHERICAL BEARING END OF THE DAMPER BEARING SCREW
OF THE HELICOPTER AND ITS PREVENTION 

Authors

Semenikhin Roman Leonidovich, candidate of technical sciences, product support engineer, JSC "Helivert" (140070, 26/3 Garshina street, Tomilino village, Lyuberetsky district, Moscow region, Russia), airroman1980@gmail.com

Index UDK

629.7.026.56

DOI

10.21685/ 2307-4205-2018-2-8

Abstract

Background. There is the mathematical model developed in this article for often appeared malfunction of helicopter main rotor – helicopter main rotor damper rod end spherical bearing rotation, which is detected visually by misalignment of the mark on the outer race of bearing and the damper rod end.
Materials and methods. The mathematical model is developed on basic vibration impact to the damper rod end, taking into account that the considering system is maximally loaded in condition close to origin of ground resonance. This model shows that lead role in this process has the coefficient of friction inside the bearing. When this coefficient increases till its critical meaning, that malfunction appears. The coefficient of friction inside the bearing increases because of the lubricant depletes during the part operates. The process of the lubricant depletion during the operation is irreversible for wide using at this time the main rotor rod ends with spherical bearings which don't require periodical lubrication. In order to improve reliability of helicopter main rotor and exclusion spherical bearing rotation, in this article considered the possibility to use main rotor rod ends which require periodical lubrication during operation. In order to select the most suitable main rotor rod end from items having the same load characteristics, new coefficients were proposed and scientifically substantiated to evaluate the efficiency and profitability of these parts.
Results and conclusions. The results of the work could be recommended to helicopter design organizations for designing of main rotors and modifying of main rotors in operation by mandatory service bulletin issuing.

Key words

Main rotor, helicopter, main rotor damper, spherical bearing, mathematical model, bearing rotation

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Дата создания: 18.06.2018 14:08
Дата обновления: 19.06.2018 10:12