Modified Null Flow Modulator.
Patent, Filed 15 Jul 85, patented 5 May 87,
DEPARTMENT OF THE NAVY WASHINGTON DC
Pagination or Media Count:
A method of pulse-width modulation for operating oppositely aligned thruster valves of an integrated valve assembly in an aerospace post-boost control system in which zero average thrust during a modulation period is provided by commanding the thruster valves to be simultaneously on for a selected portion of the rest of the modulation period. Non-zero average thrust is provided by varying the simultaneously operation of the thruster valves established for zero average thrust by commanding an increased on-time for one thruster valve while commanding a correspondingly decreased on-time for the thruster valve, the excursions in on-time and in off-time occurring around the zero-thrust turn-on time or the zero-thrust turn-off time.
- Fluid Mechanics
- Liquid Propellant Rocket Engines