Vibration Analysis of A 3-Bladed Marine Propeller Shaft for 35000DWT Bulk Carrier

##plugins.themes.bootstrap3.article.main##

  •   Asima Madokuboye

  •   Alfred E. Ogbonnaya

Abstract

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.


Keywords: ANSYS, Shaft Misalignment, Ship Propeller, Bulk Carrier Vibration

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

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

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

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/

J.L. Durfy (2000). Investigation of damping treatments for propeller shaft vibration. Electronic Theses and Dissertations. Paper 2502.

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

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

ABS (January 2015). “Ship Vibration” [Online]. Available:https://www.eagle.org/eagleExternalPortalWEB/ShowProperty/BEA%20Repository/Rules&Guides/Current/147_ShipVibration/Pub147_ShipVib

O. Kingsley (May 2013). “Torsional Vibration in ship's propulsion system” [Online]. Available: https://www.academia.edu/9886603/Torsional_Vibration_in_Ships_Proplsion_System

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

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

A. Ishiodu, E. Williams, O. Ezenwa, and E. Kuvie (2013). “Design Procedure of 4-Bladed Propeller”. WAJIAR Vol.8 No.1 September 2013.

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

K. Mashud (June 2017). “Ship Design Project and Presentation” [Online]. Available: http://teacher.buet.ac.bd/mmkarim/propellerlecture.pdf/

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

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/

Machining warehouse facility (June 2017). “C46400 Brass Material Data Sheet” [Online]. Available: http://www.spectrummachine.com/c46400-brass-material-data-sheet

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

I. Guwahati (July 2014). “Torsional Vibrations of Rotors: The Direct and Transfer Matrix Methods” [Online]. Available: http://nptel.ac.in/courses/112103024/15 Torsional

H. Chris (February 2010). “Imbalance, Misalignment, Looseness: Know the difference [Online]. Available: http://www.hansfordsensors.com/imbalance-misalignment-looseness-know-difference

D. Tony (June 2010), “Phase Analysis: Making vibration analysis easier”. [Online]. Available: http://www.reliableplant.com/Read/26843/phase-analysis-vibration

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.

Downloads

Download data is not yet available.

##plugins.themes.bootstrap3.article.details##

How to Cite
[1]
Madokuboye, A. and Ogbonnaya, A. 2019. Vibration Analysis of A 3-Bladed Marine Propeller Shaft for 35000DWT Bulk Carrier. European Journal of Engineering Research and Science. 4, 10 (Oct. 2019), 78-86. DOI:https://doi.org/10.24018/ejers.2019.4.10.914.