CP Propeller Equipment - Martin's Marine Engineering Page

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Technical Calculation andServicesArrangement drawingsProvided MAN B&W Alpha have adequateinformation on the ship hull, anarrangement drawing showing a suitablelocation of the propulsion plant inthe ship can be carried out with dueconsideration to a rational lay–out ofpropeller shaft line and bearings.In order to carry out the above arrangementdrawing MAN B&W Alpha needthe following drawings: Ship lines plan Engine room arrangement General arrangementMoreover, to assist the consulting firmor shipyard in accomplishing their ownarrangement drawings, drawings of ourpropeller programme can be transmittedby E–mail or a disk can be forwardedby regular post. The disks arecompatible with various CAD programmes.Should you require furtherinformation, please contact MAN B&WAlpha.Plant information bookAfter the contract documentation hasbeen completed a Plant InformationBook will be forwarded. This book willcomprise all necessary detailed drawings,specifications and installation instructionsfor our scope of supply.CAE programmes are used for makingalignment calculations, epoxy chockcalculations, torsional vibration calculationsetc. In the following a brief descriptionis given of some of our CAEprogrammes and software service.The alignment calculations ensure acceptableload distribution of the sterntube bearings and shaft bearings.Torsional vibrationsA comprehensive analysis of the torsionalvibration characteristics of thecomplete propulsion plant is essentialto avoid damage to the shafting due tofatigue failures.Based on vast experience with torsionalvibration analysis of MAN B&Wtwo and four–stroke propulsion plants,the VBS and VB propeller equipment isdesigned with optimum safety againstpremature failure due to fatigue. Stressraisers in the shafting or servo unit areminimized using finite element techniques.2 04 01 13–6.0mm–0.200.20.40.6Shaftline for S4633When the propeller is delivered with aMAN B&W engine a complete torsionalvibration analysis in accordance withthe Classification Society rules is performed.This includes all modes ofoperation including simulation of enginemisfire.When the total propulsion plant is designedand manufactured by MANB&W, the optimum correlation betweenthe individual items exists. The extensiveknow–how ensures that the optimumsolution is found as regards minimizingstresses in connection withtorsional vibration calculations. Fig 35shows the result of a torsional vibrationcalculation.1 2 3 4 5 6 7 81 23 4 5mAlignment instructionsFor easy alignment of the propellershaft line, alignment calculations aremade and a drawing with instructions isgiven in the Plant Information Book, fig34.BearingNo.12345Bearing reaction(kN)43.1006.979–0.04346.14746.318Vertical displacement(mm)0.00E+000.00E+003.56E–013.60E–013.60E–01Fig 34: Calculated reactions and deflections in bearingsAngular deflection(rad)3.11E–041.83E–042.03E–057.28E–064.81E–0622This document, and more, is available for download at Martin's Marine Engineering Page - www.dieselduck.net
When propellers are delivered toanother engine make than MAN B&W,a complete set of data necessary forperforming the analysis is forwarded tothe engine builder in question, fig 36.Whirling and axial vibration calculationsBased on our experience the propellerequipment and shafting are designedconsidering a large safety marginagainst propeller induced whirl andaxial vibrations. In case of plants withlong intermediate shafting or sternposts carried by struts, a whirling analysisis made to ensure that the naturalfrequencies of the system are sufficientlyoutside the operating speed regime.Propeller induced axial vibrations aregenerally of no concern but analysis ofshafting systems can be carried out inaccordance with Classification Societyrequirements.2 03 25 97–1.0Torsional stress amplitude (N/mm)150100500Rule limit forcontinuous runningActual stressesRule limit fortransient runningBarred speed range40 50 60 70 80 90 100 110 120 130Engine speed r/minFig 35: Torsional vibration calculationBulk carrier project 6S50MC 8,580 kW/127 r/minPropeller shaft aft end (d= 460 mm/Ck = 0.55)This document, and more, is available for download at Martin's Marine Engineering Page - www.dieselduck.net23
Page 2 and 3: 2This document, and more, is availa
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Page 6 and 7: Propeller equipmentThe standard pro
Page 8 and 9: Mechanical DesignPropeller type VBS
Page 10 and 11: Propeller type VBThe VB propeller e
Page 12 and 13: Hydra PackThe servo oil unit - Hydr
Page 14 and 15: Propeller Shaft and CouplingFlangeT
Page 16 and 17: Hydraulic boltsThe propeller equipm
Page 18 and 19: Optimizing Propeller EquipmentPrope
Page 20 and 21: Hydrodynamic design of propellerbla
Page 24 and 25: 600K1K2K32000 3785 1100 1197 950 94
Page 26 and 27: Propeller equipment VBSA B C D2 04
Page 28 and 29: Data Sheet for Propeller and Propul

CP Propeller Equipment - Martin's Marine Engineering Page

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