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Due to the accuracy limitation of the FDM machine, the edge and the surface of the propeller model arc not very smooth. Glue can be used to cover the propeller to achieve a smooth propeller body. Epoxy is a good choice for a propeller surface coating, because epoxy ean provide a thin wall around the surfaee and increase the strength of materials [411. In order to avoid unequal coating thickness, it is better to coat one blade at a time and keep the blade flat when the glue is drying. When the epoxy is fully dried, sand paper ean be used to make the blades much more smooth. As introduced before, PC is the strongest material to produce a strong propeller using FDM. PC coating with epoxy can provide higher strength than PC only. The detailed data for the strength orthe PC coating with epoxy material will need some experiments in the future work. Ifthe material is still not strong enough for some specific cases, the FDM propeller model can be used as a casting mould to produce a metal propeller. In chapter 6, Stratasys Fusion Deposition Modeling (FDM) 2000 is introduced. The method ofproducing a propeller using Stratasys 2000 is also presented. The material that can be used in Stratasys 2000 is listed, and PC is the best material for a propeller fabrication using FDM. Coating with glue can provide smooth and higher strength property lor a propeller model. 104
Chapter 7 Conclusions and Future Work 7.1 Conclusions rhe described rapid marine propeller design process was developed \0 facilitate a propeller design frolll simulation through 10 prototyping and testing processes. The OpcnPYL SW code was developed \0 generate the propeller geometry for automatic input into the CAD soBware, SolidWorks. SolidWorks includes the CFD simulation capability for propellers using the CosmosFloWorks package. This study has proven that CosmosFloworks can generate a reasonable prediction for propeller thrust. CosmosWorks can then be used to check the strength ora propeller design using FEA analysis. The original OpcnPVL code was able to generate the propeller design geometry for the CAD software. RI lIND. This gl'OlTIctry is generat(,'d as the sets ofpoints that are loeated on the foil sections orthe propeller blade. Users then had to use several commands to plot oul the geometry of the propeller in RIIINO. The OpenPVL SW code extended this capacity to generate the propeller geometry without any manual commands in 105
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A Rapid Development Process for Mar
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Table of Contents Abstract ... Ackn
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List ofTables Table I: Required Inp
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Figure 46: Surface Dynamic Pressure
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a long time to analyze, draw, fabri
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Simulation work is now commonly don
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Early theoretical analysis applied
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------------------------- provides
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As can be secn in Table I, the lift
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propeller geometry has to be entere
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avoid cavitation; however, it decre
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l" ........... ,... __ .... :l ,,_
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Table 2: Advantages and Disadvantag
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trend for many companies to reduce
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fluxes through a particular control
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known as a casting, is usually ejec
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Table 3: Prototyping Technology Mat
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quite accuratc for a testing level.
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For given values ofJ, Fn, Rn, En, t
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propeller geometry for impon into t
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Using OpenPVL_SW I a propeller desi
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o ...n".... 'Co 'OJ • • • DC)
Page 72 and 73: 3.3 Simulations using CosmosFloWork
Page 75 and 76: simulation domain are set to 6m and
Page 79: CosmosWorks can be used to check th
Page 82: Figure 33: Dynamic Pressure Distrib
Page 88: Chapter 4 Case Study: Simulation of
Page 94 and 95: The plots of RPM and thrust from ou
Page 96 and 97: Figure 46: Surface Dynamic Pressure
Page 98: Figure 48: Deflection ofthe AUV Pro
Page 102: In this simulation, two nose cones
Page 110 and 111: Chapter 6 Propeller Fabrication by
Page 112 and 113: Figure 60: Stratasys rDM 2000 After
Page 115: Material options for Stratasys Fusi
Page 119 and 120: References III Burtner, E., 1953, "
Page 121 and 122: [20] D'Epagnier, P.K., 2005, "A Com
Page 123 and 124: Appendix 1\: The Part ofOpcnPVL_SW
Page 125: Create all of the function commands
Page 131: Appendix B: SolidWorks Macro lor th
Page 134: 'create loft swModcl.ClearSelcction
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