Method of calculating high-speed rolling bearings intended for an aircraft engine based on considering the wear process

Silayev, B. M.; Danilenko, P. A.

doi:10.3103/s1068366615040169

Cited by 12 publications

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“…With the increasing application of high-speed equipment such as control systems for rocket engines and fans, the cageless bearing is used as the protective bearing of the electromagnetic bearing rotor system, the discrete performance of rolling elements is the premise to ensure the smooth operation of rotor [1,2]. The design of the local variable diameter raceway in the outer ring of bearing is a method to realize the discretization of rolling elements [3].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Contact Stress Distribution between Rolling Element and Variable Diameter Raceway of Cageless Bearing

2022

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The change in contact state between the rolling elements and raceway of a cageless bearing with a variable diameter raceway affect the wear of the bearing, which leads to discrete motion failure of the rolling elements. For this purpose, the contact characteristics as contact form and contact stress between the rolling elements and raceway were determined. A numerical method is proposed to determine the three-dimensional contact stress of a cageless bearing. First, combined with the variable diameter raceway structure characteristics and the motion of rolling elements, the rolling elements and raceway contact stress model was established, and the influence factors of contact stress and the maximum stress distribution were determined. Based on the rolling contact theory, the relative position of the stick-slip region and the tangential stress distribution of the contact area were analyzed. The stress equations for the three-dimensional between rolling elements and variable diameter raceway were obtained by the principle of superposition, and the stress component characteristics of the contact area were numerically simulated. The results show that the main influencing factors of contact stress are: load, structure of variable diameter raceway, spindle speed, friction coefficient µ and the ratio of the stick region and the slip region k. Taking a cageless bearing as an example, the influence of the contact curvature Ri on the contact stress is smaller than that of ri. Increasing ri to make it larger than 1.5 mm and controlling the speed to be lower than 13,950 r/min, the maximum stress appears in the conventional raceway, which is beneficial to alleviate the failure of the variable diameter raceway. There are a slip region and a stick region in the contact area, reducing the friction coefficient µ and increasing the stick-slip coefficient k appropriately can ensure the discrete movement of the rolling elements and reduce the wear of the variable diameter raceway. The error of the stress distribution model is less than 15%, which can predict and characterize the contact stress distribution between the rolling elements and the variable diameter raceway. The theoretical guidance for the development and application of cageless bearings is provided.

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Section: Introductionmentioning

confidence: 99%

Analysis of Contact Stress Distribution between Rolling Element and Variable Diameter Raceway of Cageless Bearing

2022

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“…Много работ посвящено исследованиям по разработке математических моделей, методов и методик расчёта ПК на износ, на долговечность с учётом изнашивания поверхностей и т.д. В работе [8] представлен метод расчёта высокоскоростной опоры качения авиационного двигателя с учётом изнашивания. В [9] предлагается закон изнашивания для контактных давлений и скорости скольжения с учётом свойств смазочных и конструкционных материалов.…”

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Predicting changes in radial and axial clearances in ball bearings lubricated with low-viscosity liquids

Silayev

Барманов

2022

VESTNIK of Samara University. Aerospace and Mechanical Engineer

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Parts of rolling bearings lubricated with low-viscosity fluids are subject to intense wear of the working surfaces. The bearing life cycle under these conditions depends on the wear rate of the friction surfaces. Therefore, it is important to establish the relationship between the wear rate, the change in the clearances and the duration of work. This paper presents the results of wear tests for rolling ball bearings. After the tests the radial and axial clearances were measured, their changes and the duration of operation were analyzed. Having determined the path of friction, the wear rates of the bearings were calculated based on the values of changes in the radial and axial clearances. The wear rate of the bearing on the axial and radial clearances was plotted against the reduced (equivalent) load. The obtained dependences were approximated with a confidence of at least 98%. The obtained analytical expressions allow us to perform express calculations for changes in the bearing clearances. This will make it possible to forecast the bearing service time, taking into account the wear of the working surfaces under specified conditions, while ensuring correct functioning of the support assembly.

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Discrete theory of rolling elements for a cageless ball bearing

Zhao

Wang

et al. 2022

J Mech Sci Technol

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Method of calculating high-speed rolling bearings intended for an aircraft engine based on considering the wear process

Cited by 12 publications

References 1 publication

Analysis of Contact Stress Distribution between Rolling Element and Variable Diameter Raceway of Cageless Bearing

Analysis of Contact Stress Distribution between Rolling Element and Variable Diameter Raceway of Cageless Bearing

Predicting changes in radial and axial clearances in ball bearings lubricated with low-viscosity liquids

Discrete theory of rolling elements for a cageless ball bearing

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