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The plots of RPM and thrust from our simulations and Dr. Vurnl's experiements have a similar trend, which prove that our simulation results for the relation of RPM and thrust are reasonable. The plot of RPM and thrust can calculate thc RPM whcn the required thrust at certain vessel speed is known. RPM is a main factor ofcavitation, which will destroy propeller and cause noise and vibration; low RPM is used to avoid cavitation. RPM is also a factor ofsympathetic vibration between propeller and vessel. Certain RPM ofpropeller has its own frequency. Ifthis frequency is equal to the natural frequency of vessel, sympathetic vibration, which can destroy propeller and vessel, will be created. If the thrust is known, this plot can provide the RPM information for designers to avoid cavitation and sympathetic vibration. Another two propellers were developed using OpenPVL_SW with the designed thrust of 55 and 95N (other parameters ure the same as the AUV propeller). Simulations were used for these two propellers to confirm CosmosFloWorks can provide a good predicted thrust result for propellers. Table 6 displays the thrust simulation results ofthc two propellers. 82
Table 6: Simulation Results of the Three Propellers Simulation Designed Simulated Domain Size Error % Thrust Thrust (widthxdepthx length) Propeller I 55N 56.3N 2.38% 8mx8mx3Om Propeller 2 75N 82.7 N 10010 IOmxlOmx50m Propeller 3 95N 99.5N 4.77% l5mx l5mx70m After the CFD simulation, CosmosWorks is used to check the strength ofthe propeller. Fib'\1re 46 displays the surface dynamic pressure on the AUV propeller blades with 75N· designed thrust. The dynamic pressure is the source to provide the thrust for a propeller design. Each blade provides the same force, that's why the distribution is symmctrical. 83
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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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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
Page 64: 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 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 and 116: Material options for Stratasys Fusi
Page 117 and 118: Chapter 7 Conclusions and Future Wo
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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