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Abstract

There exist cases where precise simulations of contact forces do not allow modeling the gears as rigid bodies but a fully elastic description is needed. In this paper, a modally reduced elastic multibody system including gear contact based on a floating frame of reference formulation is proposed that allows very precise simulations of fully elastic gears with appropriately meshed gears in reasonable time even for many rotations. One advantage of this approach is that there is no assumption about the geometry of the gears and, therefore, it allows precise investigations of contacts between gears with almost arbitrary non-standard tooth geometries including flank profile corrections.

This study presents simulation results that show how this modal approach can be used to efficiently investigate the interaction between elastic deformations and flank profile corrections as well as their influence on the contact forces. It is shown that the elastic approach is able to describe important phenomena like early addendum contact for insufficiently corrected profiles in dependence of the transmitted load. Furthermore, it is shown how this approach can be used for precise and efficient simulations of beveloid gears.

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Authors and Affiliations

Trong Phu Do
Peter Eberhard
Pascal Ziegler
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Abstract

The authors present the part of research devoted to the "squat" -type crack development in the heads of railway rails. This paper contains description of the results of investigations of the influence of the dynamic interaction, between the railway bogie running along the track on the "squat't-type crack development. The studies are performed by the use of computer simulation technique. The study is divided into two parts. The first part explains, how the vertical displacement of the wheel varies during the quasi-static rolling of the bo gie wheel along the cracked rail. In the second part of the paper, this displacements fluctuation is introduced to dynamic analysis. The histories of the wheel-rail force fluctuation during passage along the rail with the "squat'l-type crack were obtained as the result of dynamic analysis.
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Authors and Affiliations

Mirosław Olzak
Tomasz Szolc
ORCID: ORCID

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