Revolutionary Technologies Group C1 Nicholas Arch, Nicholas Fraser, Robert Huth, Patrick Noble, Michael Toomey Preliminary Design Review February 21, 2008
Last Week’s Action Items ITEM 1: Perform Research for Trade Studies Arch – Matlab code examines generator-gearbox features Frasier – Designing base “tower” and guy wires Huth – Modeling loads on shaft to determine diameter and material properties needed Toomey – Calculated area required to extract necessary power from wind and number of blades in helix Noble – Research methods for analyzing fluid flow through blade overlap
Item 1: Trade Studies in Progress T=(D 1 -D 2 )r=ρdV 2 (A 1 C d1 -A 2 C d2 )/16 d D1D1 D2D2 A1A1 A2A2
Item 1: Trade Studies (Cont’d) For a hollow shaft, deflection is more dependent on outer diameter. Plot will allow material selection (Elastic modulus) for a maximum deflection. Elastic Modulus [Gpa] Max. Deflection [m]
Last Week’s Action Items (Cont’d) ITEM 2: Develop Intelligent Systems Concepts for Turbine As group, brainstormed concepts: Monitor rpm of turbine and generator shafts with tachometers Anemometer to measure wind speed Discussed electronic components with Mr. Brownell Battery type (Lithium-Ion, Carbon-Zinc, Capacitor, Lead Acid) Charging issues (Diode, Voltage Regulator, DC-to-DC Converter) Safety concerns (Temperature Sensor – Relay Control System)
Lead Acid Battery Chosen – simple charging scheme and produces fairly constant 12.6 V Current Regulator Required (i.e. diode, automotive V-regulator, DC-to-DC converter) Safety Concerns Cutout charging if charging current or temperature is too great Cutout generator or brake turbine if outside operating zone Item 2: Electronics light relay Reg. Gen. 1.8 A 3.6 A
Current Status of Concept Status of Design - Trade Studies to assist in critical decision-making - Show-stopper: Simple, quick to assemble
Next Week’s Action Items Major Component Selection and Ordering Huth will present shaft study results and group will determine shaft to order (Tues. 2/26) Investigate bearings to fit shaft (Tues. 2/26) Arch will search for gears (Tues. 2/26) Noble will check back with Mr. Brownell to ensure generator procurement (Tues. 2/26) Select and locate blade material (Huth will visit Physics machine shop) (Thurs. 2/28)
Next Week’s Action Items Cont’d Complete Trade Studies Group members will present results from trade studies (Thurs. 2/26) Critical design variables selected (Thurs. 2/26): Blade Diameter and Height Overlap Gap Number of Blades Total Prototype Height Base Diameter and Support System Gear Ratio
Thank You Questions?