cansat 2008: university of new hampshire final presentation
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University of New Hampshire Page 1
University of New HampshireUniversity of New Hampshire
CANSAT Final PresentationJune 15th 2008
University of New Hampshire Page 2
University of New HampshireUniversity of New Hampshire
WildCatSat Team
University of New Hampshire Page 3
University of New HampshireUniversity of New Hampshire
Outline
• Design Overview• Raw Data Plots• Processed/Analyzed Data Plots• Outcome of Flight Ops/Failure Analysis• Comparison of Actual CONOPS to Planned
CONOPS
University of New Hampshire Page 4
University of New HampshireUniversity of New HampshireMechanical Design Overview
System Bus:• ABS Plastic• Rapid Prototype using 3-D
Printer
Recovery System:• Octagonal Parachute
– Rip-Stop Nylon– Area: 1.016 m2
• Nylon Cord
University of New Hampshire Page 5
University of New HampshireUniversity of New Hampshire
Up-righting System:• Hinged side doors • Torsion springs provide force to open doors• Pin connected to servo motor holds doors in
place/releases doorsParachute Release System:• Pin attached to side door• Pin holds parachute to bus while doors closedTotal Measured Mass: 470g
Mechanical Design Overview
University of New Hampshire Page 6
University of New HampshireUniversity of New Hampshire
Structural Drawings
University of New Hampshire Page 7
University of New HampshireUniversity of New HampshireElectrical System Diagram
ProcessorPressure Sensor
Transceiver
Buzzer Servo
Transceiver
Computer
University of New Hampshire Page 8
University of New HampshireUniversity of New HampshireElectrical Design Overview
Sensors:• SCP1000 Barometric pressure and temp. sensorMicroprocessor:• Atmel ATMega168Transmitter:• Aerocomm AC4790-1000MBattery• 11.1V 800 mAh Li-Poly• 12.26V Initial, 12.19V After Mission: 0.7V Drop
University of New Hampshire Page 9
University of New HampshireUniversity of New Hampshire
Ground Station Computer:• HP Pavilion N5425
Ground Station Receiver:• Aerocomm ConnexLink 4790
Ground Station Antenna:• External high gain omni-directional antenna
Ground Station
University of New Hampshire Page 10
University of New HampshireUniversity of New Hampshire
Raw Data Plots
University of New Hampshire Page 11
University of New HampshireUniversity of New Hampshire
Processed Data
0 20 40 60 80 100 120 140 160 180 2008.4
8.6
8.8
9
9.2x 10
4
Mission Time (s)
Pre
ssur
e (P
a)
0 20 40 60 80 100 120 140 160 180 200-200
0
200
400
600
800
Mission Time (s)
Alti
tude
(m)
Note: Matlab truncation of LS digit = loss in accuracy
University of New Hampshire Page 12
University of New HampshireUniversity of New Hampshire
Processed Data (cont.)
(Processed with Matlab’s ‘Diff’ and ‘Filter’ functions and window size of 10)
From VTI Tech: “Assumed constant temp. gradient of dT/dH from 1976 US Standard Atmosphere”
H = 30°C/(6.5°C/km)*(1-(P/101325Pa)^0.19
20 40 60 80 100 120 140 160 180 2000
1
2
3
4
5
6
7
8
9
10
Flight Time (s)
Des
cent
Rat
e (m
/s)
Reference: VTI Technologies
University of New Hampshire Page 13
University of New HampshireUniversity of New Hampshire
Flight Operations
• Altitude Transmission: Success • Average Descent Rate: 3.3767 m/s• Descent Time: (1340s-1160s)/60 ~3 min
University of New Hampshire Page 14
University of New HampshireUniversity of New HampshireFlight Operations (cont.)
• Recovery: Success• Up-righting System: Success • Ground Temperature (bonus): Not Met
From: 34.48.097N 101.35.244WTo: 34.47.88N 101.35.562W
~1.28km Lateral Distance Traveled
Reference: http://www.movable-type.co.uk/scripts/latlong.html
University of New Hampshire Page 15
University of New HampshireUniversity of New Hampshire
• Pattern Loss ~30%• Ground Absorption• Terrain• Ground Station Antenna height
a) Elev. Pattern b) Azimuth PatternReference: Aerocomm Corp.
Failure Analysis
University of New Hampshire Page 16
University of New HampshireUniversity of New Hampshire
• Satellite activated• Satellite loaded into rocket• Satellite takes initial pressure reading• Rocket launches• Satellite detects pressure change, starts sending pressure/altitude data • Satellite ejects from rocket• Parachute deploys, slowing descent• Satellite descends at less than 4.6 m/s• Satellite continues to transmit data
• Satellite lands• Doors open up-righting satellite• Parachute released• Buzzer activates• Ground temperature reading and transmission• Data transmission stops
Preparation
Launch
Deployment
Descent
Recovery
CONOPS Comparison
University of New Hampshire Page 17
University of New HampshireUniversity of New HampshireWildCatSat Sponsors
– UNH ECE Dept.– UNH ME Dept.
• Jon Arlington at Orbital Sciences Corp.
• The Byrd Family
Todd GrossProfessor and Chair
May-Win TheinAssociate Professor
University of New Hampshire Page 18
University of New HampshireUniversity of New Hampshire
Questions?
Professor May-Win Thein
Project Advisor
Ph.D Mechanical Engineering
mthein@unh.edu
Robert TerryTeam Leader
Electrical Engineer
rhs4@unh.edu
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