Accession Number : ADA304586

Title :   Selected Papers on Environmental and Attitude Control of Manned Spacecraft.

Descriptive Note : Technical memo.

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER

PDF Url : ADA304586

Report Date : DEC 1966

Pagination or Media Count : 91

Abstract : The disturbance and control aspects of the Apollo extension systems (AES) concept are discussed and studies made at the Langley Research Center of the external and internal disturbances for an earth-orbital mission are outlined. Typical results are presented to illustrate the disturbance profiles and vehicle response for the zero-gravity mode of operation. Experimental programs for possible 90-day and 45-day AES missions are described in terms of requirements and experimental program durations. The fuel consumption required to compensate for the disturbances and to provide control for the experiments is also given. The disturbance envelope and the experimental program requirements are used to develop an optimum control system. Weight trade-offs of three competitive systems led to the choice of a control-moment gyro-jet system combination as the optimum minimum-weight system for the extended Apollo mission. Example experimental tasks were simulated to determine the effectiveness of this control system.

Descriptors :   *SPACECRAFT, *ATTITUDE CONTROL SYSTEMS, REQUIREMENTS, CONTROL SYSTEMS, OPTIMIZATION, COMPETITION, EARTH ORBITS, RESEARCH FACILITIES, TIME, PROFILES, RESPONSE, INTERNAL, MISSIONS, WEIGHT, OPERATION, FUEL CONSUMPTION, LIGHTWEIGHT, EXTERNAL, VEHICLES, WEIGHTLESSNESS, TRADE OFF ANALYSIS, ENVELOPE(SPACE), LUNAR PROBES, MANNED SPACECRAFT.

Subject Categories : Fluid Mechanics
      Manned Spacecraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE