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):

Report Date:

1987-11-05

Pagination or Media Count:

9.0

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.

Subject Categories:

  • Fluid Mechanics
  • Liquid Propellant Rocket Engines

Distribution Statement:

APPROVED FOR PUBLIC RELEASE