Accession Number : AD0475439

Title :   DISCRETE CONTROL OF VEHICLES WITH BOUNDED INPUT AND VARIATION IN PARAMETER VALUES.

Descriptive Note : Interim technical rept.,

Corporate Author : UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING

Personal Author(s) : Sworder, D. D.

Report Date : NOV 1965

Pagination or Media Count : 20

Abstract : Design of a control device for use aboard a space vehicle encounters many difficulties emanating from the wide variations in environmental conditions under which the controller must operate. The controlled system must be insensitive to additive external disturbances as well as to such internal effects as system parameter variation. An important side constraint on the resulting compensation is a restriction on the available energy sources. This is commonly expressed by the power supply voltage or by the maximum magnitude of allowable rocket thrust. In this report a study is made of the control of a linear system with a bounded input. In particular attention is directed to systems which are adequately described by difference equations. These systems are the natural analogues of low frequency electro-mechanical servos. It is supposed that the disturbances can be described by a stochastic process with known probability description. Since in many cases the frequency band of most interest in the disturbance description will above the servo bandwidth, the noise is assumed to be independent from sample to sample. The main result of this work is a recurrence formula for the feedback controller. Solution of this recurrence equation is illustrated by analysis of a simple example. (Author)

Descriptors :   (*CONTROL SYSTEMS, SPACECRAFT), (*LINEAR SYSTEMS, CONTROL SYSTEMS), STOCHASTIC PROCESSES, SERVOMECHANISMS, DIFFERENCE EQUATIONS, OPTIMIZATION, FEEDBACK.

Subject Categories : Unmanned Spacecraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE