A study on torsional vibration attenuation in automotive drivetrains using absorbers with smooth and non-smooth nonlinearities

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 ord...

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Main Authors:	Ahmed Haris, Eliot Motato, Stephanos Theodossiades, Homer Rahnejat, P. Kelly, A.F. Vakakis, L.A. Bergman, D.M. McFarland
Format:	Default Article
Published:	2016
Subjects:	Mechanical engineering not elsewhere classified Targeted energy transfer Nonlinear energy sink Engine order vibrations Cubic nonlinearity 5th Order Nonlinearity Vibro-impact Vehicular drivetrain Mechanical Engineering not elsewhere classified
Online Access:	https://hdl.handle.net/2134/22807
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id	rr-article-9564680
record_format	Figshare
spelling	rr-article-95646802016-01-01T00:00:00Z A study on torsional vibration attenuation in automotive drivetrains using absorbers with smooth and non-smooth nonlinearities Ahmed Haris (1252017) Eliot Motato (1252767) Stephanos Theodossiades (1247457) Homer Rahnejat (1247550) P. Kelly (4606342) A.F. Vakakis (7209497) L.A. Bergman (7209500) D.M. McFarland (7209503) Mechanical engineering not elsewhere classified Targeted energy transfer Nonlinear energy sink Engine order vibrations Cubic nonlinearity 5th Order Nonlinearity Vibro-impact Vehicular drivetrain Mechanical Engineering not elsewhere classified 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. 2016-01-01T00:00:00Z Text Journal contribution 2134/22807 https://figshare.com/articles/journal_contribution/A_study_on_torsional_vibration_attenuation_in_automotive_drivetrains_using_absorbers_with_smooth_and_non-smooth_nonlinearities/9564680 CC BY 4.0
institution	Loughborough University
collection	Figshare
topic	Mechanical engineering not elsewhere classified Targeted energy transfer Nonlinear energy sink Engine order vibrations Cubic nonlinearity 5th Order Nonlinearity Vibro-impact Vehicular drivetrain Mechanical Engineering not elsewhere classified
spellingShingle	Mechanical engineering not elsewhere classified Targeted energy transfer Nonlinear energy sink Engine order vibrations Cubic nonlinearity 5th Order Nonlinearity Vibro-impact Vehicular drivetrain Mechanical Engineering not elsewhere classified Ahmed Haris Eliot Motato Stephanos Theodossiades Homer Rahnejat P. Kelly A.F. Vakakis L.A. Bergman D.M. McFarland A study on torsional vibration attenuation in automotive drivetrains using absorbers with smooth and non-smooth nonlinearities
description	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.
format	Default Article
author	Ahmed Haris Eliot Motato Stephanos Theodossiades Homer Rahnejat P. Kelly A.F. Vakakis L.A. Bergman D.M. McFarland
author_facet	Ahmed Haris Eliot Motato Stephanos Theodossiades Homer Rahnejat P. Kelly A.F. Vakakis L.A. Bergman D.M. McFarland
author_sort	Ahmed Haris (1252017)
title	A study on torsional vibration attenuation in automotive drivetrains using absorbers with smooth and non-smooth nonlinearities
title_short	A study on torsional vibration attenuation in automotive drivetrains using absorbers with smooth and non-smooth nonlinearities
title_full	A study on torsional vibration attenuation in automotive drivetrains using absorbers with smooth and non-smooth nonlinearities
title_fullStr	A study on torsional vibration attenuation in automotive drivetrains using absorbers with smooth and non-smooth nonlinearities
title_full_unstemmed	A study on torsional vibration attenuation in automotive drivetrains using absorbers with smooth and non-smooth nonlinearities
title_sort	study on torsional vibration attenuation in automotive drivetrains using absorbers with smooth and non-smooth nonlinearities
publishDate	2016
url	https://hdl.handle.net/2134/22807
_version_	1797465611302862848

A study on torsional vibration attenuation in automotive drivetrains using absorbers with smooth and non-smooth nonlinearities

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