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Title: A study on torsional vibration attenuation in automotive drivetrains using absorbers with smooth and non-smooth nonlinearities
Authors: Haris, Ahmed
Motato, Eliot
Theodossiades, Stephanos
Rahnejat, Homer
Kelly, P.
Vakakis, A.F.
Bergman, L.A.
McFarland, D.M.
Keywords: Targeted energy transfer
Nonlinear energy sink
Engine order vibrations
Cubic nonlinearity
5th Order Nonlinearity
Vibro-impact
Vehicular drivetrain
Issue Date: 2016
Publisher: © The Author(s). Published by Elsevier Inc.
Citation: HARIS, A. ... et al., 2016. A study on torsional vibration attenuation in automotive drivetrains using absorbers with smooth and non-smooth nonlinearities. Applied Mathematical Modelling, in press, doi: 10.1016/j.apm.2016.09.030
Abstract: The automotive industry is predominantly driven by legislations on stringent emissions. This has led to the introduction of downsized engines, incorporating turbocharging to maintain output power. As downsized engines have higher combustion pressures, the resulting torsional oscillations (engine order vibrations) are of broadband nature with an increasing severity, which affect noise and vibration response of drive train system. Palliative devices, such as clutch pre-dampers and dual mass flywheel have been used to mitigate the effect of transmitted engine torsional oscillations. Nevertheless, the effectiveness of these palliative measures is confined to a narrow band of response frequencies. Studying nonlinear targeted energy transfers is a promising approach to study vibration mitigation within a broader range of frequencies, using nonlinear vibration absorbers (or nonlinear energy sinks – NESs). These devices would either redistribute vibration energy within the modal space of the primary structure thus dissipating the vibrational energy more efficiently through structural damping, or passively absorb and locally dissipate a part of this energy (in a nearly irreversible manner) from the primary structure . The absence of a linear resonance frequency of an NES, enables its broadband operation (in contrast to the narrowband operation of current linear tuned mass dampers). Parametric studies are reported to determine the effectiveness of various smooth or non-smooth nonlinear stiffness characteristics of such absorbers. A reduced drivetrain model, incorporating single and multiple absorber attachments is used and comparison of the predictions to numerical integrations proves its efficacy.
Description: Note: this is the accepted version and will be replaced by the definitive version when available. This is an Open Access Article. It is published by Elsevier under the Creative Commons Attribution 4.0 Unported Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/4.0/
Sponsor: The authors wish to express their gratitude to the EPSRC for the financial support extended to the “Targeted energy transfer in powertrains to reduce vibration-induced energy losses” Grant (EP/L019426/1), under which this research was carried out. Thanks are also due to project partners; Ford Motor Company and Raicam Clutch for their support.
Version: Accepted for publication
DOI: 10.1016/j.apm.2016.09.030
URI: https://dspace.lboro.ac.uk/2134/22807
Publisher Link: http://dx.doi.org/10.1016/j.apm.2016.09.030
ISSN: 1872-8480
Appears in Collections:Published Articles (Mechanical, Electrical and Manufacturing Engineering)

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