Solar Based Propulsion System UAV Conceptual Design ( * )
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1 Solar Based Propulsion System UAV Conceptual Design ( * ) Avi Ayele*, Ohad Gur, and Aviv Rosen* *Technion Israel Institute of Technology IAI Israel Aerospace Industries (*) Ayele A., Gur O., Rosen A., "Conceptual MDO of solar powered UAV," 53 rd Israel Annual Conference on Aerospace Sciences, March 6-7, 213, Israel 1
2 Ragone Chart Curtsey of Lidor A., Weihs D., Sher E. 1.E+9 1.E+8 Ragone Chart 1.E+7 Carbon Nano Tubes Specific Power [W/kg] 1.E+6 1.E+5 1.E+4 1.E+3 1.E+2 1.E+1 1.E+ Metal Spring Pneumatics Shape Memory Alloy Flywheel Phase Change Materials Li-Ion Battery Fuel Cell Internal Combustion Engine Solar Panels Radioisotope Thermoelectric Generator 1.E-1 Synthetic Muscle 1.E-2 1.E-2 1.E-1 1.E+ 1.E+1 1.E+2 1.E+3 1.E+4 1.E+5 Specific Energy [W-hr/kg] Lidor A., Weihs D., Sher E., Alternative Power-Plants for micro aerial vehicles (MAV), 53 rd Israel Annual Conference on Aerospace Sciences 2
3 Ragone Chart Curtsey of Lidor A., Weihs D., Sher E. 1.E+9 1.E+8 Ragone Chart 1.E+7 Carbon Nano Tubes Specific Power [W/kg] 1.E+6 1.E+5 1.E+4 1.E+3 1.E+2 1.E+1 1.E+ Metal Spring Pneumatics Shape Memory Alloy Flywheel Phase Change Materials Li-Ion Battery Fuel Cell Internal Combustion Engine Solar Panels Radioisotope Thermoelectric Generator 1.E-1 Synthetic Muscle 1.E-2 1.E-2 1.E-1 1.E+ 1.E+1 1.E+2 1.E+3 1.E+4 1.E+5 Specific Energy [W-hr/kg] Lidor A., Weihs D., Sher E., Alternative Power-Plants for micro aerial vehicles (MAV), 53 rd Israel Annual Conference on Aerospace Sciences 3
4 Firsts Steps 1 st Solar Vehicle Sunrise II, Nov st Manned Solar Vehicle Solar Riser, April st Manned Solar Vehicle Gossamer Pinguin, May 198 Crossing the English Channel Endurance Record, 2 Weeks Flight Solar Challenger, July 1981 Qinetiq Zephyr, July 21 André Noth, History of Solar Flight, Autonomous System Lab, Swiss Federal Institute of Technology, Zürich, July 28 4
5 NASA HALEs (High Altitude, Long Endurance) Pathfinder Pathfinder-Plus Centurion Helios ,5 ft, ,2 ft, , ft (goal) 96,8 ft, 21 b = 3m b = 37m b=63m b=75m AR=12 AR=15 AR=26 AR=31 m=25 kg m=315 kg m=86kg m=93kg Dryden Flight Research Center Website, [cited: February 213) 5
6 Main Design Challenge Energy Balance Solar Panels Efficiency Energy Storage Weight / Volume Aerodynamics Structure (Weight) 6
7 Main Design Challenge Energy Balance Solar Panels Efficiency Energy Storage Weight / Volume Aerodynamics Structure (Weight) Solution MDO: Multidisciplinary Design Optimization 7
8 Performance, Like Sausages Power Mission Drag Weight Performance Laws, like sausages, cease to inspire respect in proportion as we know how they are made (John Godfrey Saxe, 1869) 8
9 Analysis Model Date, Time, Location, Attitude Air-Vehicle Geometry Mission Definition Solar Radiation Model Aerodynamic Model Weight Estimation Flight Condition Available Power Drag Polar Vehicle Weight Power Mission Drag Weight Energy Balance Mission Feasibility Performance 9
10 Solar Radiation Model Based on ESDU formulation Time (date / hour) Latitude / Longitude Altitude Attitude August 212, Israel Total Solar Irradiance Outside Earth's Atmosphere Total Solar Irradiance at Sea Level Horizontal Surface to the Earth Israel Meteorological Service Watt/Sqrm Sunrise Sunset : 2: 4: 6: 8: 1: 12: 14: 16: 18: 2: 22: : Time Engineering Sheet Data Units, "Solar heating: total direct irradiance within the earth s atmosphere," ESDU 6915, September
11 Aerodynamic Drag Estimation FF IF Lift dependent drag Only induced Simple Oswald factor (e =.9) Zero lift drag i, Wing i, Wing Drag bookkeeping Form-Factor Interference-Factor Wing = = 1.1 t c + 2 t c 2 FF IF i, Fuse. i, Fuse. = 1+ = 1 C C D = D i = Fuselage 6 C C D f i ( L W H ) Fuse. Fuse. Fuse πar FF IF i i +.25 S W e S C Wet i L Fuse. Fuse. H 2 L Fuse. Roy T. Schemensky, Development of an empirically based computer program to predict the aerodynamics characteristics of aircraft. Volume 1, Empirical methods, Air Force Flight Dynamic Laboratory, AD-78-1, November
12 Weight Estimation Weight Bookkeeping Structure Propulsion system Batteries Solar Panel Payload Motor Weight Estimation A. Noth, "Design of Solar Powered Airplanes for Continuous Flight," Ph.D. Thesis, ETH, Eidgenössische Technische Hochschule Zürich, September 28 12
13 Structure Weight Estimation mstructure, kg Actual Mass Noth Stender Rizzo Rizzo X 1.5 Icare II Pathfinder Pathfinder Plus m m Structure, Noth Structure, Rizzo 1.5 m m Structure, Rizzo Structure, Stender =.44b 3.1 = 15.19b = 22.8b = 8.763b Centurion AR AR AR AR.311 Helios.5 b, m 13
14 Mission Definition Sunset Sunset 7, ft <7, ft S.L 2 ft/min 2 ft/min Sunrise Sunrise 14
15 Mathematical Programming Formulation minf x R s. t. g n ( x) ( x) f(x) cost function Vehicle mass Night time altitude Payload mass x design variables Wing dimension Battery mass g(x) design constraints Energy balance 15
16 Numerical Implementation Matlab & ESTECO modefrontier environment 16
17 Design Case A Design Variables Design Variable Battery mass, m Battery Minimum Cruise Altitude Aspect Ratio, AR Wing Span, b Cost Function 1 m Night Time Altitude - Maximize Total Vehicle Mass - Minimize Design Constraint Energy balance Minimum Value 1 kg 5, ft 5 Maximum Value 1 kg 7, ft 4 1 m 17
18 Design Case A, Pareto Front m Payload = 2 kg m Battery,kg Total Vehicle Mass, kg b,kg (Diameter) Night Time Altitude, ft 18
19 Design Case A, Pareto Front m Payload = 2 kg m Battery,kg Battery Mass, mbattery, kg Night Time Altitude, ft Total Vehicle Mass, kg b,kg (Diameter) Night Time Altitude, ft 19
20 Design Case A, Pareto Front Designs Wing Span, b, m Night Time Altitude, ft Wing Aspect Ratio, AR Night Time Altitude, ft Wing Area, S, m Structural Mass, mstructure, kg Night Time Altitude, ft Night Time Altitude, ft 2
21 Technology Improvements Design Case A Two main technologies: Solar panels efficiency Nominal 22%, Improved: 4% Batteries energy density Nominal 35 W-hr/kgf, Improved: 5 W-hr/kgf 21
22 Technology Improvements Total Mass Total mass, kg Night Time Altitude, ft η Sol. =.22 ρ Bat. =35 W-hr/kg η Sol. =.4 ρ Bat. =35 W-hr/kg η Sol. =.22 ρ Bat. =5 W-hr/kg η Sol. =.4 ρ Bat. =5 W-hr/kg 22
23 Technology Improvements Battery Mass Battery mass, kg Night Time Altitude, ft η Sol. =.22 ρ Bat. =35 W-hr/kg η Sol. =.4 ρ Bat. =35 W-hr/kg η Sol. =.22 ρ Bat. =5 W-hr/kg η Sol. =.4 ρ Bat. =5 W-hr/kg 23
24 Design Case B Design Variables Design Variable Battery mass, m Battery Aspect Ratio, AR Wing Span, b Cost Function Minimum Value 1 kg 5 1 m Payload Mass - Maximize Maximum Value 5 kg 25 1 m Total Vehicle Mass Minimize Two cases Night time altitude 65 kft Night time altitude 5 kft Design Constraint Energy balance Required Payload Power, Watt Payload Mass, kg 24
25 Design Case B, Pareto Front Total Mass, kg Battery Mass, mbattery, kg Payload Mass, kg Night Altitude 5, ft Night Altitude 65, ft Payload Mass, kg Night Altitude = 5, ft Night Altitude = 65, ft 25
26 Design Case B, Pareto Front Designs Payload Mass / Total Mass Night Altitude = 5, ft Night Altitude = 65, ft Payload Mass, kg (Payload Mass + Battery Mass) / Total Mass Payload Mass, kg Night Altitude = 5, ft Night Altitude = 65, ft.7 Structural Mass / Total Mass Night Altitude = 5, ft Night Altitude = 65, ft Payload Mass, kg 26
27 Conclusions Solar UAV design is a MDO problem Staying aloft forever requires very big vehicles Even for a very modest payload Low feasibility for constant altitude HALE Lower night time altitude is required Crucial importance of improved technologies Main effort: Energy storage weight and volume Solar panels efficiency Structure (Weight) 27
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