GIMBALLED VS FIXED ENGINE INVESTIGATION.
Interim technical rept.
RADIO CORP OF AMERICA BURLINGTON MASS DEFENSE ELECTRONIC PRODUCTS
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The report contains the results of a study of 8 different types of thrust vector altitude control systems for space vehicle applications. Expected constant and sinusoidal disturbance moments are derived. The linear distur bance feedback from propellant sloshing is derived. The methods of determining disturbance inputs from structural vibration and system noise are outlined. The dynamic effects of the linear disturbance feedback from propellant sloshing are analyzed and modifications to the control system designs are made when necessary to insure system stability. The transient responses of the linear systems to a step disturbance moment are calculated. The relative efficiency, weight, and complexity of fixed versus gimballed systems are analyzed for two arbitrarily selected thrust levels. The effects of gimbal angle limitations on the performance of the control system used for the gimballed engine with hinge line ahead of the vehicle cg are examined. Author