Abstract
In this work we present a novel method for the solution of gear contact problems in flexible multi-body. These problems are characterized by significant variation in the location and size of the contact area, typically requiring a high number of degrees of freedom to correctly capture deformation and stress fields. Therefore fully dynamic simulation is computationally prohibitive. To overcome these limitations, we exploit a combined analytic-numerical contact model within a parametric model order reduction (PMOR) scheme. The reduction space consists of a truncated set of eigenvectors augmented with a parameter dependent set of residual static shape vectors. Each static shape is computed by interpolating among a set of displacement modes of the interacting bodies, obtained from a series of precomputed static contact analyses. During the contact analyses, an analytic model based on the Hertz theory describes the teeth local deformation. We implement the proposed method in an in-house code and we apply it to spur and helical gears dynamic contact analyses. We compare the results with classical PMOR schemes highlighting how the combined use of the semi-analytic contact model allows to decrease further the model complexity as well as the computational burden, for both static and dynamic cases. Finally, we validate the methodology by means of a comparison with experimental data found in literature, showing that the numerical method is able to capture quantitatively the static transmission error measurements in case of both helical and spur geared transmission for different torque levels.
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05 August 2021
A Correction to this paper has been published: https://doi.org/10.1007/s11012-021-01401-8
Notes
In the remainder of this paper we will refer to \(\alpha\) and P of Eq. (20) respectively as Hertz-penetration gap and Hertz-contact force.
In the remaining of this paper the q-dependence of the matrices and vectors in Eq. (25) are implied for notational convenience.
Differently from the spur gear example, in case of aligned helical gears the complexity of the contact formulations does not vary along the angular pitch just as the number of gear axial sections in contact.
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Acknowledgements
The authors gratefully acknowledge the support of the European Commission for their support of the Marie Curie program through the EMVEM project (GA 315967) and the IAPP DEMETRA project (GA 324336). The Research Fund KU Leuven is gratefully acknowledged for its support. The research of T. Tamarozzi is funded by a grant from the IWTVLAIO Flanders VIRTUAL MATES. The IWT agency is gratefully acknowledged also for its support within the OPTIWIND project. This research was partially supported by Flanders Make, the strategic research centre for the manufacturing industry.
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Cappellini, N., Tamarozzi, T., Blockmans, B. et al. Semi-analytic contact technique in a non-linear parametric model order reduction method for gear simulations. Meccanica 53, 49–75 (2018). https://doi.org/10.1007/s11012-017-0710-5
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DOI: https://doi.org/10.1007/s11012-017-0710-5