Intermediate shaft concept study
Santapere, Johanna (2016)
2016
Materiaalitekniikan koulutusohjelma
Teknisten tieteiden tiedekunta - Faculty of Engineering Sciences
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Hyväksymispäivämäärä
2016-05-04
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:tty-201604113797
https://urn.fi/URN:NBN:fi:tty-201604113797
Tiivistelmä
This is a concept study about intermediate shafting in thrusters. Intermediate shafting is located between the main engine and the thruster. Currently, the shafting includes steel shaft with supporting bearings. Currently, the thruster and the main engine are installed to the ship after the hull is finished. In the future, customer wants to build ships with a new principle, which includes installing the thruster and the main engine at the early stage. The goal is to design a simpler shafting configuration, which provides easier installation and maintenance.
One reference project was used for the design task. For this study, demands and wishes for intermediate shafting were asked and a requirements list was created. Possible solutions were widely searched and most important solutions were selected for deeper study. Offers were asked from different shaft and component suppliers. Finally, an evaluation was made with a help of Guideline VDI 2225.
The main problem in intermediate shafting is vibrations, which have to be taken into consideration when designing a shafting configuration. The first natural frequency has to be high enough in order to avoid resonance. Natural frequencies can be increased with steel tube shafts and composite shafts. With composite shafts, longer shaft lines can be obtained without the need for bearings compared to steel shafts. Lower weight of composite shaft enhances easy installation. However, composites are more expensive. In the future, shaft line options will be presented to the customer and they will choose one solution for detailed design.
One reference project was used for the design task. For this study, demands and wishes for intermediate shafting were asked and a requirements list was created. Possible solutions were widely searched and most important solutions were selected for deeper study. Offers were asked from different shaft and component suppliers. Finally, an evaluation was made with a help of Guideline VDI 2225.
The main problem in intermediate shafting is vibrations, which have to be taken into consideration when designing a shafting configuration. The first natural frequency has to be high enough in order to avoid resonance. Natural frequencies can be increased with steel tube shafts and composite shafts. With composite shafts, longer shaft lines can be obtained without the need for bearings compared to steel shafts. Lower weight of composite shaft enhances easy installation. However, composites are more expensive. In the future, shaft line options will be presented to the customer and they will choose one solution for detailed design.