sif #2: 6 - μpils, hardware-in-the-loop synthesis and analysis of spacecraft micropropulsion...
Upload: rit-centre-of-excellence-within-space-for-innovation-and-growth
Post on 18-Jan-2017
70 views
TRANSCRIPT
Hardware-in-the-loop synthesis and analysis of spacecraft micropropulsion systems
Rikard Ottemark & Johan Sundqvist
Main SupervisorProf. Reza Emami
Onboard Space Systems
Assistant SupervisorDr. Kristoffer Palmer
Nanospace
May 10, 2016
Nanosatellites• Low cost• Short production time• Technology demonstrators• Education• Time and spatial resolution
Micropropulsion systemsNanosatellite main Conventional satellite ADCSpropulsion or disturbance reduction
Micropropulsion systems• Small impulse bits• High precision• Relatively large• Relatively high power consumption
Micropropulsion systems• Minimum mass• Minimum size• Minimum power consumption• Rare
NanoSpace CubeSat propulsion module• Four 1mN thrusters
• Individually controllable
• Complete system• Propellant tank with filters and temperature control • Thruster modules with nozzle, proportional
valves, sensors, heaters• On/off solenoid valves (two barriers)• Control and I/F electronics
NanoSpace CubeSat propulsion module• ”6U” version under development
• Dual propellant storage tanks• Plenum tank• More barriers• New communication I/Fs and protocols
• Modular design• Thrusters can be placed quite freely…
NanoSpace CubeSat propulsion module• IOD on Chinese TW-1 satellite, Launched Sept 2015
• First thruster firings in November • Orbit raised by ~600 m• Thrust misbalance observed• Problem in ADCS caused spin-up
NanoSpace CubeSat propulsion module• New mission: De-spin the satellite!
• OBC off• Manual control
• Preparations for formation flying started in April• Delta-V maneuvers expected to start soon
NanoSpace CubeSat propulsion module• Two planned launches in 2017
• MIST, 3U system (KTH, SE)• GOMX-4B, 6U system (GomSpace, DK)
• Thruster upscaling• 10-30 mN butane thrusters
Simulations• EcosimPro• Propellant flow• Pressure• Temperature• State• Plenum tank
Hardware-in-the-loop simulation• Spherical air bearing• Modular cold gas system• Attitude determination• Real-time Simulink integration
Platform challenges• Minimize moment of inertia• Align mass center with center of rotation• Propellant selection