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Effects of transmission shaft flexibility on rolling element bearing tribodynamics in a high-performance transmission

In a high-performance transmission, rolling bearings play a crucial role in supporting the loaded shafts and gear mesh whilst minimising friction. Prediction of critical speeds and dynamic responses is important to avoid prolonged periods of elevated vibration amplitudes, which can contribute to pre...

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Main Authors: Brett Thomas Friskney, Mahdi Mohammad-Pour, Stephanos Theodossiades, Christopher Craig, Greg Rapson
Format: Default Article
Published: 2021
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Online Access:https://hdl.handle.net/2134/14832342.v1
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author Brett Thomas Friskney
Mahdi Mohammad-Pour
Stephanos Theodossiades
Christopher Craig
Greg Rapson
author_facet Brett Thomas Friskney
Mahdi Mohammad-Pour
Stephanos Theodossiades
Christopher Craig
Greg Rapson
author_sort Brett Thomas Friskney (5543738)
collection Figshare
description In a high-performance transmission, rolling bearings play a crucial role in supporting the loaded shafts and gear mesh whilst minimising friction. Prediction of critical speeds and dynamic responses is important to avoid prolonged periods of elevated vibration amplitudes, which can contribute to premature bearing and gearbox failure. Nonlinearities such as backlash and time-varying stiffnesses can lead to complex coupled dynamics between gears and bearings. In the current study, an 8-speed transmission is discretized and modelled by the finite element method. The eigenproblem is solved using damped modal analysis considering gyroscopic effects. Time-varying stiffness data and backlashes are introduced as nonlinearities. The system response is compared for cases of linear and nonlinear bearings, and rigid and flexible shafts to ascertain the significance of elasticity. The flexible model improves the accuracy of bearing load oscillation by altering the transfer path between gears and bearings. This provides an advancement upon existing works, where shaft dynamics are often simplified. Furthermore, it is shown that the combination of local nonlinear effects and flexible components significantly changes the response of the system and the bearing life prediction for a system-level analysis.
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institution Loughborough University
publishDate 2021
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spelling rr-article-148323422021-07-19T00:00:00Z Effects of transmission shaft flexibility on rolling element bearing tribodynamics in a high-performance transmission Brett Thomas Friskney (5543738) Mahdi Mohammad-Pour (1255251) Stephanos Theodossiades (1247457) Christopher Craig (11036252) Greg Rapson (7208747) Mechanical engineering not elsewhere classified Rotordynamics High-performance transmission Finite element method Rolling element bearing Spur gear Nonlinearity Mechanical Engineering In a high-performance transmission, rolling bearings play a crucial role in supporting the loaded shafts and gear mesh whilst minimising friction. Prediction of critical speeds and dynamic responses is important to avoid prolonged periods of elevated vibration amplitudes, which can contribute to premature bearing and gearbox failure. Nonlinearities such as backlash and time-varying stiffnesses can lead to complex coupled dynamics between gears and bearings. In the current study, an 8-speed transmission is discretized and modelled by the finite element method. The eigenproblem is solved using damped modal analysis considering gyroscopic effects. Time-varying stiffness data and backlashes are introduced as nonlinearities. The system response is compared for cases of linear and nonlinear bearings, and rigid and flexible shafts to ascertain the significance of elasticity. The flexible model improves the accuracy of bearing load oscillation by altering the transfer path between gears and bearings. This provides an advancement upon existing works, where shaft dynamics are often simplified. Furthermore, it is shown that the combination of local nonlinear effects and flexible components significantly changes the response of the system and the bearing life prediction for a system-level analysis. 2021-07-19T00:00:00Z Text Journal contribution 2134/14832342.v1 https://figshare.com/articles/journal_contribution/Effects_of_transmission_shaft_flexibility_on_rolling_element_bearing_tribodynamics_in_a_high-performance_transmission/14832342 CC BY-NC-ND 4.0
spellingShingle Mechanical engineering not elsewhere classified
Rotordynamics
High-performance transmission
Finite element method
Rolling element bearing
Spur gear
Nonlinearity
Mechanical Engineering
Brett Thomas Friskney
Mahdi Mohammad-Pour
Stephanos Theodossiades
Christopher Craig
Greg Rapson
Effects of transmission shaft flexibility on rolling element bearing tribodynamics in a high-performance transmission
title Effects of transmission shaft flexibility on rolling element bearing tribodynamics in a high-performance transmission
title_full Effects of transmission shaft flexibility on rolling element bearing tribodynamics in a high-performance transmission
title_fullStr Effects of transmission shaft flexibility on rolling element bearing tribodynamics in a high-performance transmission
title_full_unstemmed Effects of transmission shaft flexibility on rolling element bearing tribodynamics in a high-performance transmission
title_short Effects of transmission shaft flexibility on rolling element bearing tribodynamics in a high-performance transmission
title_sort effects of transmission shaft flexibility on rolling element bearing tribodynamics in a high-performance transmission
topic Mechanical engineering not elsewhere classified
Rotordynamics
High-performance transmission
Finite element method
Rolling element bearing
Spur gear
Nonlinearity
Mechanical Engineering
url https://hdl.handle.net/2134/14832342.v1