Patrick Dempsey Bridget Fitzpatrick Heather Garber Keith Hout Jong Soo Mok Propulsion Preliminary Design Review #2 October 17, 2000.

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Presentation transcript:

Patrick Dempsey Bridget Fitzpatrick Heather Garber Keith Hout Jong Soo Mok Propulsion Preliminary Design Review #2 October 17, 2000

Motor Evaluation -Minimum required values to complete the mission Power = 125W Thrust at climb = 3.36 lbf Thrust at turn = 2.80 lbf -Run motor test code using the motor constants supplied by the manufacturer.

Motor code -Values input into the code For Motor Vin = voltage * cell # Motor constants – Kt, Kv, Rm, Io Inet = Iin-Io Pin= Vin*Iin Tout=Kt*Inet Pout=Inet*(Vin-Iin*Rm) RPM= Kv*(Vin-Iin*Rm)

Motor Code Eta=Pout/Pin Istall = Vin/Rm Imax= sqrt(Io^2*Istall) Etamax= ((Imax-Io)/Imax)^2 For Gearbox: given values-gear ratio (m), Eta g RPM g =RPM/m Pout g = Pout/Eta g For Speed Controller: given value-Resistance(R) Pd = Iin^2*R

Motor code Pin sp =Pout B =Pin+Pd Pout sp =Pin Eta sp = Pout sp / Pin sp -Choose the best motor based on Power output and Efficiency. -Select optimal condition

Astro Cobalt 25 at 19.2 Volts

Aveox 1415/1.5 at 19.2 Volts

Aveox 1415/2 at 19.2 Volts

Maxcim N32-13D at 19.2 Volts

Maxcim N32-13Y at 19.2 Volts

Motor Selection Motor : Maxcim N32-13Y Voltage : 19.2 V Current : 16 A Efficiency : % RPM : Pout : W Tout: in-oz

Gearbox and Speed Controller Selection Gearbox -Efficiency : 95% -Gear Ratio : 3.7 -Pout g : A Speed Controller -Efficiency :99.29% -Resistance : Ohms -Pout sp :307.2 W -Pin sp : W

Propeller Analysis Tool : modified Gold script Method : Run at various diameters and pitches Match Power and Thrust Get value for J = V/nD, Cp, and Ct Calculate Power from Battery P B = Pr/(Eta s *Eta m *Eta g *Eta p ) Calculate Energy required for Battery E = P B *t

Propeller Analysis P B from Motor Code >= P B from Calculation E est = P B *2min. + 3/4*P B *10min. <= E

Propeller Selection and Power Matching Results from modified Gold Script

Advance Ratio Versus Efficiency

Advance Ratio Versus Cp and Ct

Propeller Selection and Power Matching Propeller : 14” Diameter and 10” Pitch P B Calculation(Gold) = W P B from Code (Motor Code) = W Endurance time =12 min. E= W-min. E est = W-min.

Questions?