Understanding Friction in Cam–Tappet Contacts—An Application-Oriented Time-Dependent Simulation Approach Considering Surface Asperities and Edge Effects

With the increasing challenges of climate change and scarce resources, the development of sustainable and energy-efficient technical systems is becoming increasingly important. In many applications, the friction losses occurring in contacts have a decisive influence on the overall efficiency. At thi...

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Autores principales:	Christian Orgeldinger, Stephan Tremmel
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	tribology EHL simulation elastohydrodynamic lubrication cam/tappet contact finite element method friction mechanisms Science Q
Acceso en línea:	https://doaj.org/article/2c535bf8e5e947529f5ffe682c14a7a7
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spelling	oai:doaj.org-article:2c535bf8e5e947529f5ffe682c14a7a72021-11-25T18:11:53ZUnderstanding Friction in Cam–Tappet Contacts—An Application-Oriented Time-Dependent Simulation Approach Considering Surface Asperities and Edge Effects10.3390/lubricants91101062075-4442https://doaj.org/article/2c535bf8e5e947529f5ffe682c14a7a72021-10-01T00:00:00Zhttps://www.mdpi.com/2075-4442/9/11/106https://doaj.org/toc/2075-4442With the increasing challenges of climate change and scarce resources, the development of sustainable and energy-efficient technical systems is becoming increasingly important. In many applications, the friction losses occurring in contacts have a decisive influence on the overall efficiency. At this point, tribological contact optimization can make an important contribution to increasing the efficiency of technical systems. However, improvements are often associated with a considerable experimental effort. To reduce the development time, additional simulation models can be applied to predict the tribological behavior. This requires the closest possible approximation of the real contact within a numerical model. This paper presents a simulation approach for the time-dependent simulation of a cam–tappet contact. The simulation uses realistic operating conditions as they arise in the valve train of internal combustion engines. The influence of edge effects on the friction behavior is considered by a scaled calculation area and the influence of the surface roughness is investigated using stochastic asperity models. It is shown that the tribological behavior within the contact strongly depends on the surface properties and the load spectrum used. In addition, edge effects on the sides of the contact area have a clear influence on the pressure and film thickness distribution.Christian OrgeldingerStephan TremmelMDPI AGarticletribologyEHL simulationelastohydrodynamic lubricationcam/tappet contactfinite element methodfriction mechanismsScienceQENLubricants, Vol 9, Iss 106, p 106 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	tribology EHL simulation elastohydrodynamic lubrication cam/tappet contact finite element method friction mechanisms Science Q
spellingShingle	tribology EHL simulation elastohydrodynamic lubrication cam/tappet contact finite element method friction mechanisms Science Q Christian Orgeldinger Stephan Tremmel Understanding Friction in Cam–Tappet Contacts—An Application-Oriented Time-Dependent Simulation Approach Considering Surface Asperities and Edge Effects
description	With the increasing challenges of climate change and scarce resources, the development of sustainable and energy-efficient technical systems is becoming increasingly important. In many applications, the friction losses occurring in contacts have a decisive influence on the overall efficiency. At this point, tribological contact optimization can make an important contribution to increasing the efficiency of technical systems. However, improvements are often associated with a considerable experimental effort. To reduce the development time, additional simulation models can be applied to predict the tribological behavior. This requires the closest possible approximation of the real contact within a numerical model. This paper presents a simulation approach for the time-dependent simulation of a cam–tappet contact. The simulation uses realistic operating conditions as they arise in the valve train of internal combustion engines. The influence of edge effects on the friction behavior is considered by a scaled calculation area and the influence of the surface roughness is investigated using stochastic asperity models. It is shown that the tribological behavior within the contact strongly depends on the surface properties and the load spectrum used. In addition, edge effects on the sides of the contact area have a clear influence on the pressure and film thickness distribution.
format	article
author	Christian Orgeldinger Stephan Tremmel
author_facet	Christian Orgeldinger Stephan Tremmel
author_sort	Christian Orgeldinger
title	Understanding Friction in Cam–Tappet Contacts—An Application-Oriented Time-Dependent Simulation Approach Considering Surface Asperities and Edge Effects
title_short	Understanding Friction in Cam–Tappet Contacts—An Application-Oriented Time-Dependent Simulation Approach Considering Surface Asperities and Edge Effects
title_full	Understanding Friction in Cam–Tappet Contacts—An Application-Oriented Time-Dependent Simulation Approach Considering Surface Asperities and Edge Effects
title_fullStr	Understanding Friction in Cam–Tappet Contacts—An Application-Oriented Time-Dependent Simulation Approach Considering Surface Asperities and Edge Effects
title_full_unstemmed	Understanding Friction in Cam–Tappet Contacts—An Application-Oriented Time-Dependent Simulation Approach Considering Surface Asperities and Edge Effects
title_sort	understanding friction in cam–tappet contacts—an application-oriented time-dependent simulation approach considering surface asperities and edge effects
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/2c535bf8e5e947529f5ffe682c14a7a7
work_keys_str_mv	AT christianorgeldinger understandingfrictionincamtappetcontactsanapplicationorientedtimedependentsimulationapproachconsideringsurfaceasperitiesandedgeeffects AT stephantremmel understandingfrictionincamtappetcontactsanapplicationorientedtimedependentsimulationapproachconsideringsurfaceasperitiesandedgeeffects
_version_	1718411488696205312

Understanding Friction in Cam–Tappet Contacts—An Application-Oriented Time-Dependent Simulation Approach Considering Surface Asperities and Edge Effects

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