Vibration Analysis of A 3-Bladed Marine Propeller Shaft for 35000DWT Bulk Carrier
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Vibration Analysis of a 3-bladed Marine Propeller shaft for 35000 DWT Bulk Carrier was carried out. The objectives of the analysis were mathematically designing the 3-bladed propeller shaft, carrying out computer aided design of the shaft and numerically performing vibration analysis. The methodology include mathematically designing the marine propeller and the corresponding shaft, manual calculation of the natural frequency of the shaft, using solidworks to design the shaft and numerically performing vibration analysis on the designed shaft using Analysis System (ANSYS) software. Hub (boss) diameter of 0.17m was calculated. The hollow shaft has external and internal diameters of 0.10m and 0.09m respectively. Torques of 202Nm2 and 384.72Nm2 were obtained at the driver and driven shafts respectively. The natural frequency calculated manually was 249Hz while that of the ANSYS was 280Hz which gives an error of 12%. However, the numerical analysis carried out with ANSYS software also showed that a phase difference of 1800 occurs at the frequency of 280Hz which is a signal of possible misalignment of shaft. At this frequency, the displacement of the shaft has a maximum value of 7.87 . Reaction forces from the components of the shaft were also observed to play major role in the vibration of the propeller shaft. These reaction forces, which cause wearing of the stern tube and intermediate bearings due to friction, are represented by phase angles closer to zero degree. Wear due to friction is a major source of shaft misalignment.
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References
-
A. L. Galloway (2014). “Mechanical Vibrations: Types, Testing and Analysis” [Online], assessed February, 2019 from https://www.novapublishers.com/catalog/product_info. php?products_id=10932
Google Scholar
1
-
O.C. Chikwendu (2014). Shop Floor Vibration Analysis and Control. International Journal of Advanced Engineering Technology E-ISSN 0976-3945. Int J Adv Engg Tech/Vol. VII/Issue III/July-Sept.,2016/207-211
Google Scholar
2
-
A. Sharma (2017). “Estimating the Effects of Blasting Vibrations on the High-Wall Stability” [Online], assessed February, 2019 from https://uknowledge.uky.edu/cgi/viewcontent.cgi?article=1042&context=mng_etds
Google Scholar
3
-
C. Soumya (March 2016). Types of Vibrations On Ships – Machinery Vibrations [Online]. Available: http://www.marineinsight.com/naval-architecture/types-of-vibrations-on-ships-machinery-vibrations/
Google Scholar
4
-
J.L. Durfy (2000). Investigation of damping treatments for propeller shaft vibration. Electronic Theses and Dissertations. Paper 2502.
Google Scholar
5
-
J.R. Kane and R.T. McGoldrick (January 2017). Longitudinal Vibrations of Marine Propulsion-Shafting Systems [Online]. Available: http://www.sname.org/HigherLogic/System/DownloadDocumentFile.ashx?DocumentFileKey=537b2206-567a-43f0-849a-d321902335fd
Google Scholar
6
-
B. Gaurav and T. Girish (2013). “Stress Intensification & Flexibility in Pipe Stress Analysis”. International Journal of Modern Engineering Research (IJMER) Vol.3, Issue.3, May-June. 2013 pp-1324-1329
Google Scholar
7
-
ABS (January 2015). “Ship Vibration” [Online]. Available:https://www.eagle.org/eagleExternalPortalWEB/ShowProperty/BEA%20Repository/Rules&Guides/Current/147_ShipVibration/Pub147_ShipVib
Google Scholar
8
-
O. Kingsley (May 2013). “Torsional Vibration in ship's propulsion system” [Online]. Available: https://www.academia.edu/9886603/Torsional_Vibration_in_Ships_Proplsion_System
Google Scholar
9
-
F. Troy and H. Charles (November 2002). “Prevention of torsional vibration problems in reciprocating machinery” [Online]. Available: http://www.engdyn.com/images/uploads/97-prevention_of_torsional_vibration_problems.pdf
Google Scholar
10
-
D. Woodyard (May 2009). “Pounder's Marine Diesel Engine and Gas Turbines”. 9th Editon [Online]. Available: www.elsevier.com/books/pounders-marine-diesel-engines-and-gas-turbines/woodyard/978-0-7506-8984-7
Google Scholar
11
-
A. Ishiodu, E. Williams, O. Ezenwa, and E. Kuvie (2013). “Design Procedure of 4-Bladed Propeller”. WAJIAR Vol.8 No.1 September 2013.
Google Scholar
12
-
Marinesite (March 2018). “What is the Indicated power, shaft power and break power calculation” [Online]. Available:https://www.marinesite.info/2014/04/what-is-indicated-power-shaft-power-and.html
Google Scholar
13
-
K. Mashud (June 2017). “Ship Design Project and Presentation” [Online]. Available: http://teacher.buet.ac.bd/mmkarim/propellerlecture.pdf/
Google Scholar
14
-
O.J. Nsikan and A.A. Ishiodu (2016). “Design of Powerpole Marine Propulsion Unit”, African Education Indices, Volume 9 No. 1, November, 2016. ISSN 2276 – 982X
Google Scholar
15
-
M. M. Donald, R.P. Vincent and B.P. Matthew (November 2007). “Estimation of Entrained Water Added Mass properties Vibration Analysis” [Online]. Available: http://www.Hydroogencompinc.com/knowledge/
Google Scholar
16
-
Machining warehouse facility (June 2017). “C46400 Brass Material Data Sheet” [Online]. Available: http://www.spectrummachine.com/c46400-brass-material-data-sheet
Google Scholar
17
-
C. Kace (December 2012). “Unsupported length of shaft too long” [Online]. Available: www.ybw.com/forums/showthread.php?332586-Unsupported-length-of-prop-shaft-too-long
Google Scholar
18
-
I. Guwahati (July 2014). “Torsional Vibrations of Rotors: The Direct and Transfer Matrix Methods” [Online]. Available: http://nptel.ac.in/courses/112103024/15 Torsional
Google Scholar
19
-
H. Chris (February 2010). “Imbalance, Misalignment, Looseness: Know the difference [Online]. Available: http://www.hansfordsensors.com/imbalance-misalignment-looseness-know-difference
Google Scholar
20
-
D. Tony (June 2010), “Phase Analysis: Making vibration analysis easier”. [Online]. Available: http://www.reliableplant.com/Read/26843/phase-analysis-vibration
Google Scholar
21
-
P. N. Saavedra and D.E. Ramirez (January 2004). “Vibration analysis of rotors for the identification of shaft misalignment Part 1: Theoretical analysis” [Online]. Available: http://journals.sagepub.com/doi/abs/10.1243/0954406041991297?journalCode=picb.
Google Scholar
22