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a long time to analyze, draw, fabricate and test. Nowadays, due 10 rapid advances in the development of computer technologies, most engineers are using computer programs to assist in the design ofpropellers, instead of using traditional methods. After designing a propeller in a computer, rapid prototyping technologies provide a very efficient way to fabricate a prototype propeller. The material that can be used in the rapid prototyping technologies is not perfect for the actual propeller, however, using rapid prototyping machines, prototype propellers can be produced quickly facilitating early testing. If the results show the propeller is not perfonl1ing as desired, the propeller can be redesigned, reproduced and retested. Saving time is the main advantage of the rapid prototyping technologies. The general processes ofpropeller design and fabrication is to first input the propeller parameters, generate a preliminary geometry and then to run a computer program to do analysis. If the analysis results show that the propeller is suitable then the propeller geometry outputs will be used for propeller fabrication and testing; if results show the propeller is not desired, engineers will change propeller parameters to redesign it. Figure I shows a now chart ofthe proposed method ofdesign and propeller fabrication thai will be described in this thesis.
Start with vessel mission profile No Produce propeller Extract propeller Acceptable design test data parameters Calculate propeller Tow-tank blade geometry Testing; model based on propeller testing method design method (large size), direct testing (small size) Import propeller blade geometry in CAD software Generate STL file and rapid prototype Design a hub and Yes complete propeller No geometry; choose Acceptable propeller material strength Use Computational Fluid Dynamics (CFD) to predict propeller thrust No Compare the predicted and desired thrust Use Finite Element Analysis (FEA) to check strength. Yes Figure I: Flow Chart of Propeller Development Yes
Page 4: A Rapid Development Process for Mar
Page 7 and 8: Table of Contents Abstract ... Ackn
Page 9: List ofTables Table I: Required Inp
Page 12 and 13: Figure 46: Surface Dynamic Pressure
Page 16 and 17: Simulation work is now commonly don
Page 18 and 19: Early theoretical analysis applied
Page 20 and 21: ------------------------- provides
Page 22 and 23: As can be secn in Table I, the lift
Page 24 and 25: propeller geometry has to be entere
Page 27: avoid cavitation; however, it decre
Page 31: l" ........... ,... __ .... :l ,,_
Page 34: Table 2: Advantages and Disadvantag
Page 41 and 42: trend for many companies to reduce
Page 43 and 44: fluxes through a particular control
Page 45 and 46: known as a casting, is usually ejec
Page 47 and 48: Table 3: Prototyping Technology Mat
Page 49: quite accuratc for a testing level.
Page 54 and 55: For given values ofJ, Fn, Rn, En, t
Page 56: propeller geometry for impon into t
Page 59 and 60: Using OpenPVL_SW I a propeller desi
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o ...n".... 'Co 'OJ • • • DC)
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3.3 Simulations using CosmosFloWork
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simulation domain are set to 6m and
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CosmosWorks can be used to check th
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Figure 33: Dynamic Pressure Distrib
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Chapter 4 Case Study: Simulation of
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The plots of RPM and thrust from ou
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Figure 46: Surface Dynamic Pressure
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Figure 48: Deflection ofthe AUV Pro
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In this simulation, two nose cones
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Chapter 6 Propeller Fabrication by
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Figure 60: Stratasys rDM 2000 After
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Material options for Stratasys Fusi
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Chapter 7 Conclusions and Future Wo
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References III Burtner, E., 1953, "
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[20] D'Epagnier, P.K., 2005, "A Com
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Appendix 1\: The Part ofOpcnPVL_SW
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Create all of the function commands
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Appendix B: SolidWorks Macro lor th
Page 134:
'create loft swModcl.ClearSelcction
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