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Title: Design optimization study of a nonlinear energy absorber for internal combustion engine pistons
Authors: Dolatabadi, Nader
Theodossiades, Stephanos
Rothberg, Steve
Keywords: Piston impact
Piston secondary motion
Targeted energy transfer
Nonlinear energy sink
Power loss
Issue Date: 2018
Publisher: © ASME (American Society of Mechanical Engineers)
Citation: DOLATABADI, N., THEODOSSIADES, S. and ROTHBERG, S., 2018. Design optimization study of a nonlinear energy absorber for internal combustion engine pistons. Journal of Computational and Nonlinear Dynamics, 13 (9), 090910.
Abstract: Piston impacts against the cylinder liner are the most significant sources of mechanical noise in internal combustion engines. Traditionally, the severity of impacts is reduced through the modification of physical and geometrical characteristics of components in the piston assembly. These methods effectively reduce power losses at certain engine operating conditions. Frictional losses and piston impact noise are inversely proportional. Hence, reduction in power loss leads to louder piston impact noise. An alternative method that is robust to fluctuations in engine operating conditions is anticipated to improve the engine's NVH performance, whilst exacerbation in power loss remains within the limits of conventional methods. The concept of Targeted Energy Transfer (TET) through the use of Nonlinear Energy Sinks (NES) is relatively new and its application in automotive powertrains has not been demonstrated yet. In this paper, a TET device is conceptually designed and optimised through a series of parametric studies. The dynamic response and power loss of a piston model equipped with this nonlinear energy sink is investigated. Numerical studies have shown a potential in reducing the severity of impact dynamics by controlling piston's secondary motion.
Description: This paper was accepted for publication in the journal Journal of Computational and Nonlinear Dynamics and the definitive published version is available at https://doi.org/10.1115/1.4040239.
Sponsor: The authors wish to express their gratitude to the EPSRC for the financial support extended to the Encyclopaedic Program Grant (EP/G012334/1), under which this research was carried out. Thanks are also due to the consortium of industrial partners of the Encyclopaedic project, particularly to Capricorn Automotive in this instance.
Version: Accepted for publication
DOI: 10.1115/1.4040239
URI: https://dspace.lboro.ac.uk/2134/33060
Publisher Link: https://doi.org/10.1115/1.4040239
ISSN: 1555-1415
Appears in Collections:Published Articles (Mechanical, Electrical and Manufacturing Engineering)

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