University of Oulu

Rapo, M., Aho, J., Koivurova, H., & Frondelius, T. (2018). Implementing model reduction to the JuliaFEM platform. Rakenteiden Mekaniikka, 51(1), 36-54.

Implementing model reduction to the JuliaFEM platform

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Author: Rapo, Marja1; Aho, Jukka2; Koivurova, Hannu3;
Organizations: 1Wärtsilä, Järvikatu 2-4, 65100 Vaasa
2Global Boiler Works Oy, Lumijoentie 8, 90400 Oulu
3Oulu University, Pentti Kaiteran katu 1, 90014 Oulu
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.5 MB)
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Language: English
Published: Rakenteiden mekaniikan seura, 2018
Publish Date: 2018-11-07


JuliaFEM is an open source finite element method solver written in the Julia language. This paper presents an implementation of two common model reduction methods: the Guyan reduction and the Craig-Bampton method. The goal was to implement these algorithms to the JuliaFEM platform and demonstrate that the code works correctly. This paper first describes the JuliaFEM concept briefly after which it presents the theory of model reduction, and finally, it demonstrates the implemented functions in an example model. This paper includes instructions for using the implemented algorithms, and reference the code itself in GitHub. The reduced stiness and mass matrices give the same results in both static and dynamic analyses as the original matrices, which proves that the code works correctly. The code runs smoothly on relatively large model of 12.6 million degrees of freedom. In future, damping could be included in the dynamic condensation now that it has been shown to work.

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Series: Rakenteiden mekaniikka
ISSN: 0783-6104
ISSN-E: 1797-5301
ISSN-L: 0783-6104
Volume: 51
Issue: 1
Pages: 36 - 54
DOI: 10.23998/rm.69026
Type of Publication: A1 Journal article – refereed
Field of Science: 214 Mechanical engineering
Funding: Also, authors would like to acknowledge the financial supp ortof Business Finland (former Tekes) in the form of a research project WIMMA Dnro 1566/31/2015.
Copyright information: © The author(s) 2018. Open access under CC BY-SA 4.0 license.