Dynamic Capacity of Oscillating Rolling Element Bearings

Rumbarger, J. H.; Jones, A

doi:10.1115/1.3601528

Cited by 16 publications

(12 citation statements)

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“…The classic Lundberg-Palmgren theory for estimating dynamic load capacity and fatigue life for continuously rotating rolling bearings (Lundberg and Palmgren 1949) was extended for oscillating rolling bearings and correlated to laboratory fatigue life data (Rumbarger and Jones 1968), motivated by the rating of helicopter blade bearings. This included defining the critical amplitude of oscillation, the angle below which the raceway is stressed by only one roller and receives two stress repetitions per oscillation cycle because the pitch oscillation is relatively small.…”

Section: Pitch Bearing Ratingmentioning

confidence: 99%

“…The outer ring of the reference pitch bearing is stationary, while the inner ring rotates by an electric motor driving interior spur gear teeth. One important parameter is the critical amplitude of oscillation, θcrit, defined as the relative angle of rotation of the raceways for which the portion of the raceway stressed by one rolling element touches-but does not overlap-the raceway that is stressed by adjacent rollers (Rumbarger and Jones 1968). Blade root loads and pitching motions were simulated for the reference turbine in OpenFAST version 2.2 (NREL 2022).…”

Section: Reference Pitch Bearingmentioning

confidence: 99%

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Rating of a Pitch Bearing for a 1.5-Megawatt Wind Turbine

Keller

Guo

2022

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Section: Pitch Bearing Ratingmentioning

confidence: 99%

Section: Reference Pitch Bearingmentioning

confidence: 99%

Rating of a Pitch Bearing for a 1.5-Megawatt Wind Turbine

Keller

Guo

2022

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“…Another similar approach, introduced by Rumbarger and Jones (1968) and taken up by Harris et al (2009), Figure 3: Oscillation modification factor of the Harris 1 approach, exemplary for angular amplitudes from 10 • to 90 • distinguishes two different cases regarding the stressed sections of the raceways. This approach is hereafter referred to as Harris 2.…”

Section: Harrismentioning

confidence: 99%

Lifetime Calculation of Irregularly Oscillating Bearings in Offshore Winches

Wöll¹,

Krämer²,

Jacobs³

2018

MIC

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The fatigue lifetime calculation of rolling bearings has been intensively researched in the past and has been well documented in standards. The majority of the conducted research in the field of bearing life expectancy only applies to bearings under continuously rotating conditions as can be found in many technical systems, such as vehicle transmissions. However, there are many other technical applications in which bearings perform oscillating motions, for which the fatigue life calculation is currently not standardized. For such oscillatory behaviour, there exist several modifications for the standardized lifetime calculation. The available modification approaches, however, assume purely sinusoidal oscillations. Thus, irregular non-sinusoidal oscillations require approximation with a simple sinusoidal oscillation to comply with the available approaches, which can lead to a loss of information. In this paper, a numerical calculation approach to modify the lifetime calculation for oscillating bearings underlying irregularly reversing speeds and varying loads is presented. The lifetime calculation results of this approach are compared to results of existing calculation approaches for fatigue life calculation of oscillating bearings. For this, the approaches are applied on simple sinusoidal speeds and loads. Subsequently, results of all calculation approaches are shown for irregularly varying speeds and loads, using the example of the drivetrain of an offshore crane winch with Active Heave Compensation (AHC). The calculation results indicate, that available lifetime modification approaches for oscillating bearings seem to overestimate the lifetime for irregularly oscillating conditions.

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“…In Abb. 10 wurden jeweils die groBten Spannungswerte aufgetragen, die ortlich durch das Belastungsprofil erzeugt wurden. Die maximalen Spannungswerte treten in den Totpunkten auf.…”

Section: Spannungen Im Versuchskorperunclassified

“…(10). Hierbei wurde die maximale Bewegungsamplitude so bemessen, daB kein Walzelement in die vom Nachbarelement beanspruchte Werkstoffzone gelangte.…”

Section: Oberflachenermiidungunclassified

Werkstoffanstrengung bei oszillierender Gleitbewegung

Broszeit

Hess²,

Kloos

1977

Materialwissenschaft Werkst

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Bei oszillierendem Bewegungsablauf in einem tribologischen System (z. B. Kolbenring‐ Zylinder) ändert sich die Schmierfilmhöhe über dem Hub in weiten Bereichen. Insbesondere durch die Bewegungsverhältnisse im Bereich der Totpunkte kann sich dort vielfach keit hydrodynamischer Schmierfilm ausbilden. Der dadurch bedingte Mischreibungszustand führt zu einer erhöhten Werkstoffbeanspruchung in den Totpunktbereichen. Die ständige änderung der Bewegungsrichtung hat zudem einen fortwährenden Wechsel der Beanspruchungsrichtung zur Folge. Die Werkstofanstrengung wird für verschiedene Lastannahmen ermittelt.

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Dynamic Capacity of Oscillating Rolling Element Bearings

Cited by 16 publications

References 0 publications

Rating of a Pitch Bearing for a 1.5-Megawatt Wind Turbine

Rating of a Pitch Bearing for a 1.5-Megawatt Wind Turbine

Lifetime Calculation of Irregularly Oscillating Bearings in Offshore Winches

Werkstoffanstrengung bei oszillierender Gleitbewegung

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