Accession Number : ADD013320

Title :   Modified Null Flow Modulator.

Descriptive Note : Patent, Filed 15 Jul 85, patented 5 May 87,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Samario, Edward J

Report Date : 05 Nov 1987

Pagination or Media Count : 9

Abstract : 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.

Descriptors :   *PATENTS, *FLOW, *INTEGRATED SYSTEMS, *THRUSTERS, *VALVES, ASSEMBLY, MODULATION, MODULATORS, NULLS(AMPLITUDE), PULSE DURATION MODULATION

Subject Categories : Fluid Mechanics
      Liquid Propellant Rocket Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE