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Energiförluster orsakade av uppriktningsfel och obalanser i roterande maskiner
2017 (Swedish)Independent thesis Basic level (university diploma), 15 credits / 22,5 HE creditsStudent thesisAlternative title
Energy loss caused by misalignment and unbalance in rotating machinery (English)
Abstract [en]

This bachelor's thesis is the final step in earning a degree in mechanical engineering by Karlstad University, the faculty of health, science and technology. Constituents of the thesis are Maskin och Laserteknik AB, Gothenburg and Bilfinger Industrial Service AS located in Porsgrunn.

The study objective has been to describe the correlation between loss of energy and amplitudes of vibration in a drive train due to faulty settings. The area of interest was vibrations caused by misalignment and imbalance only. More specifically the change of apparent power to an AC motor when introduced to different settings, was measured and calculated.

Initially measurements of supplied current to the AC motor that turns the drive train was measured while coupling and balancing settings were ideal, according to recommendations from Prüftechnik and ISO 1940-1:2003. Vibrational spectrums were also collected for different components of the drive train. This was accomplished using a multimeter and equipment used industrially for shaft alignment and balancing of rotating machinery.

Incorrect settings were thereafter applied to the power train, resulting in various misalignments between the coupling halves. Data was recorded and analyzed with said equipment, for each individual setting.

The faulty settings that were included was mass unbalance applied to the rotor, vertical angular misalignment and vertical offset between the coupling halves. 

The results showed that increased unbalance applied to the rotor decreased the supplied current to the AC motor and therefore the apparent power. There was no pattern in the change of apparent power supplied to the AC motor when introduced to large angular misalignment between the coupling halves, nor was there for large vertical offsets. The conclusion was such that there was a correlation between vertical amplitudes of vibration and/or reactional forces in the bearings in the pillow block and apparent power supplied to the AC motor of the power train. In the case of vertical angular misalignment and vertical offset, there were no observed relations between the settings and change of apparent power.

Place, publisher, year, edition, pages
2017. , 68 p.
Keyword [en]
vibrations, misalignment, unbalance, rotating machinery
Keyword [sv]
vibrationer, uppriktningsfel, obalanser, roterande maskineri
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:kau:diva-55243OAI: oai:DiVA.org:kau-55243DiVA: diva2:1112755
External cooperation
MLT AB, Maskin och Laserteknik AB
Educational program
Study Programme in Mechanical Engineering
Presentation
2017-05-31, 21A342, Eva Eriksson salen, Universitetsgatan 2, Karlstad, 12:15 (Swedish)
Supervisors
Examiners
Available from: 2017-06-26 Created: 2017-06-20 Last updated: 2017-06-26Bibliographically approved

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  • apa
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