Nonlinear Dynamic Analysis of Ball Bearings Due to Varying Number of Balls and Centrifugal Force

Vakharia, Vinay; Gupta, V. K.; Kankar, Pavan Kumar

doi:10.1007/978-3-319-06590-8_151

Cited by 10 publications

(9 citation statements)

References 5 publications

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“…Consequently, to equations ( 9) and ( 17), this affects the force equilibrium due to the loading on the upper side of the bearing. 49 Rating life adjusted for lubrication Figure 14 shows a comparison for fatigue life calculation using both K 1 and K 2 terms. In this case, a cylindrical roller bearing is subjected to a rotation speed of n i =2000 rpm, the radial load F r = 4450 N, the fluid contamination parameter is e c =1, and the l ratio from 0.2 to 5.…”

Section: Resultsmentioning

confidence: 99%

Optimized selection of fluid lubricant for cylindrical roller bearings under elastohydrodynamic lubrication

Soares

Tsuha

Cavalca

2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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Roller bearings are widely used in machinery. Keeping the contact surfaces of bearings properly lubricated strongly mitigates wear effects, improving bearing fatigue life. Therefore, systematically selecting the lubricant fluid that satisfies bearing operation conditions allows the lubricating layer to be able to carry the applied load, the operating temperature, and the roughness on contact. The nonlinear constrained optimization method is used for lubricant selection, seeking to find the fluid that best fits the bearing operation conditions. Roller bearing lubrication is characteristically elastohydrodynamic (EHL); namely, the Hertz theory describes the load applied on the contacts of a cylindrical roller bearing, and the Stribeck condition classifies the tribological condition of the surfaces in contact. This work concludes that roughness and speed are the most important parameters to consider when choosing a fluid lubricant.

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Section: Resultsmentioning

confidence: 99%

Optimized selection of fluid lubricant for cylindrical roller bearings under elastohydrodynamic lubrication

Soares

Tsuha

Cavalca

2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…This is because a high temperature can promote cyclic stress and fatigue that can cause the bearing support to fail catastrophically in service. Furthermore, bearings developed for aircraft applications should be suitable for high speed rotation with excellent fracture strength to withstand the stress developed [12]. The desirable mechanical properties that must meet the required service conditions include; excellent wear resistance, hot-hardness, high strengthto-weight ratio [12].…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, bearings developed for aircraft applications should be suitable for high speed rotation with excellent fracture strength to withstand the stress developed [12]. The desirable mechanical properties that must meet the required service conditions include; excellent wear resistance, hot-hardness, high strengthto-weight ratio [12]. While the design takes account of the suitable specifications for the required service conditions, the Finite Element Analysis (FEA) will examine the behaviour of the component as well as its mechanical properties under varying temperature.…”

Section: Introductionmentioning

confidence: 99%

“…This tool helps to determine manufacturability and heat treatment processes in order to ensure that the developed bearing component conforms to the standards. The FEA and simulation tools such as Abaqus has not only been valuable for maximising the performance of products, but also found useful applications in the development of more detailed instructions for operating and maintaining a finished component [10][11][12]. The SLM is one of AM technologies for metal fabrication with a processing capacity of good manufacturing accuracy and it is considered suitable for the purpose of this work.…”

Section: Introductionmentioning

confidence: 99%

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Design and simulation of a bearing housing aerospace component from titanium alloy (Ti6Al4V) for additive manufacturing

et al. 2022

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In evaluating emerging technology, such as additive manufacturing, it is important to analyse the impact of the manufacturing process on efficiency in an objective and quantifiable manner. This study deals with the design and simulation of a bearing housing made from titanium alloy (Ti6Al4V) using the selective laser melting (SLM) technique. The Finite Element Analysis (FEA) method was used for assessing the suitability of Ti6Al4V for aerospace application. The choice of Ti6Al4V is due to the comparative advantage of its strength-to-weight ratio. The implicit and explicit modules of the Abaqus software were employed for the non-linear and linear analyses of the component part. The results obtained revealed that the titanium alloy (Ti6Al4V) sufficiently meets the design, functional and service requirements of the bearing housing component produced for aerospace application. The designed bearing is suitable for a high speed and temperature application beyond 1900 K, while the maximum stress induced in the component during loading was 521 kPa. It is evident that the developed stresses do not result in a distortion or deformation of the material with yield strength in the region of 820 MPa. This work provides design data for the development of a bearing housing for AM under the technique of SLM using Ti6Al4V by reflecting the knowledge of the material behaviour under the operating conditions.

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“…To determine the effects of a varying ball number and centrifugal forces on the dynamic response and excitation of the rotor system, Vakharia [13] developed a simulation model that includes specific geometric constraint assumptions for the cage speed and the ball positions.…”

Section: Introductionmentioning

confidence: 99%

Full Dynamic Ball Bearing Model with Elastic Outer Ring for High Speed Applications

Wagner¹,

Krinner²,

Thümmel³

et al. 2017

Lubricants

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Ball bearings are commonly used in high speed turbomachinery and have a critical influence on the rotordynamic behavior. Therefore, a simulation model of the bearing to predict the dynamic influence is essential. The presented model is a further step to develop an accurate and efficient characterization of the ball bearing's rotor dynamic parameters such as stiffness and deflections as well as vibrational excitations induced by the discrete rolling elements. To make it applicable to high speed turbomachinery, the model considers centrifugal forces, gyroscopic effects and ball spinning. The consideration of an elastic outer ring makes the bearing model suitable for integrated lightweight bearing constructions used in modern aircraft turbines. In order to include transient rotordynamic behavior, the model is built as a full dynamic multibody simulation with time integration. To investigate the influence of the elasticity of the outer ring, a comparison with a rigid formulation for several rotational speeds and loads is presented.

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Nonlinear Dynamic Analysis of Ball Bearings Due to Varying Number of Balls and Centrifugal Force

Cited by 10 publications

References 5 publications

Optimized selection of fluid lubricant for cylindrical roller bearings under elastohydrodynamic lubrication

Optimized selection of fluid lubricant for cylindrical roller bearings under elastohydrodynamic lubrication

Design and simulation of a bearing housing aerospace component from titanium alloy (Ti6Al4V) for additive manufacturing

Full Dynamic Ball Bearing Model with Elastic Outer Ring for High Speed Applications

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