PROPULSION MODEL. T&C SUBSYSTEM MODEL *
PROPULSION MODEL. The bipropellant model includes the twelve 22-N attitude control thrusters, the Main Satellite Thruster (MST), and the Stationary Plasma Thrusters (SPTs) if provided on the spacecraft. This model:
1. Calculates the forces and torques on the spacecraft created by the thruster firings
2. Models the pressures in both propellant tanks and the helium tank, and modifies the Specific Impulse (Isp) accordingly
3. Maintains the status of the propulsion system valves and their effect on the propulsion system
4. Models the thruster plume impingement forces and adjusts them as the solar array rotates
5. Updates the force/torque table as a function of thruster position and alignment and as the center of mass and solar array position changes
6. Changes the spacecraft mass properties as the propellant is consumed
7. Models behavior of the SPT gimbals and changing thrust vectors
8. Models leaky/blocked thrusters with a user-selected leak rate and blocked percentage
PROPULSION MODEL. 4-2 4.4 T&C SUBSYSTEM MODEL.............................................4-2 4.4.1 Caribou Decryptor Modeling...........................4-3 4.5 ORBIT & EPHEMERIS MODEL.........................................4-3 4.6 EMULATION OF THE SECOND SPACECRAFT SCE PROCESSOR................4-4 4.7 DYNAMIC POWER MODEL.............................................4-4 4.8 DYNAMIC THERMAL MODEL...........................................4-4 4.9 COMMUNICATIONS PAYLOAD MODEL....................................4-5 4.10 FAILURE MODELS.................................................4-5 5 --FAST MODE SIMULATION.....................................................5-1 6 --SIMULATOR USER INTERFACE.................................................6-1 7 --POST-PROCESSING PLOTTING.................................................7-1 8 --DESIGN REVIEWS...........................................................8-1 9 --SIMULATOR TEST AND VALIDATION............................................9-1 10 --DOCUMENTATION..........................................................10-1 11 --DELIVERY AND INSTALLATION..............................................11-1 12 --TRAINING...............................................................12-1 13 --WARRANTY & MAINTENANCE.................................................13-1
