Natural Frequencies of Bow-type Spread Roller for Paper Machines Using Finite Element Method
Kvist, Henry (2024)
2024
Konetekniikan DI-ohjelma - Master's Programme in Mechanical Engineering
Tekniikan ja luonnontieteiden tiedekunta - Faculty of Engineering and Natural Sciences
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Hyväksymispäivämäärä
2024-11-29
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:tuni-2024112610541
https://urn.fi/URN:NBN:fi:tuni-2024112610541
Tiivistelmä
Harmful vibrations of paper machine rollers can cause the web running through the machine to tear or the machine to malfunction. This leads to stoppages and in volume centric industry stoppage expenses can quickly accumulate to hundreds of thousands or even millions of euros.
This thesis aims to predict natural frequencies of bowed spread rollers with FEM (Finite Element Method) computations. Linear 1D beam model was used and it was figured out if such a model gave enough accuracy to be useful. The benefits of such a model is that it is relatively simple to compute and you get results quickly.
Some general knowledge about bowed spread rollers is presented with theory about calculating natural frequencies with FEM. Main functionalities and features of developed code are presented. Also, new measurements were tried but they ended up not succeeding. The FEM model gave accurate enough results but it could still be refined to get even better results.
This thesis aims to predict natural frequencies of bowed spread rollers with FEM (Finite Element Method) computations. Linear 1D beam model was used and it was figured out if such a model gave enough accuracy to be useful. The benefits of such a model is that it is relatively simple to compute and you get results quickly.
Some general knowledge about bowed spread rollers is presented with theory about calculating natural frequencies with FEM. Main functionalities and features of developed code are presented. Also, new measurements were tried but they ended up not succeeding. The FEM model gave accurate enough results but it could still be refined to get even better results.