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

Title data

Orgeldinger, Christian ; Tremmel, Stephan:
Understanding Friction in Cam-Tappet Contacts : An Application-Oriented Time-Dependent Simulation Approach Considering Surface Asperities and Edge Effects.
In: Lubricants. Vol. 9 (26 October 2021) Issue 11 . - No. 106.
ISSN 2075-4442
DOI: https://doi.org/10.3390/lubricants9110106

Abstract in another language

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.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: tribology; EHL simulation; elastohydrodynamic lubrication; cam/tappet contact; finite element method; friction mechanisms; system efficiency
Institutions of the University: Faculties > Faculty of Engineering Science > Former Professors > Chair Engineering Design and CAD - Univ.-Prof. Dr.-Ing. Frank Rieg
Faculties > Faculty of Engineering Science > Chair Engineering Design and CAD > Chair Engineering Design and CAD - Univ.-Prof. Dr.-Ing Stephan Tremmel
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 28 Oct 2021 08:55
Last Modified: 28 Oct 2021 08:56
URI: https://eref.uni-bayreuth.de/id/eprint/67536