Accession Number : ADA243471

Title :   Toward the Robust Control of High Bandwidth High Precision Flexible Optical Systems.

Descriptive Note : Doctoral thesis,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH

Personal Author(s) : Barker, Kenneth W.

Report Date : 1991

Pagination or Media Count : 195

Abstract : It is well known that control- structure-interaction (CSI) phenomena limit the stability and performance of controlled flexible structures. Most CSI research focuses on rigid body control of flexible structures with relatively low closed loop control bandwidths. This research examines the CSI phenomena associated with high bandwidth high precision control of a reaction actuator mounted to a flexible support structure. In particular, control-structure-interaction using a high gain porportional-integral-derivative (PID) controller is examined as it relates to certain design parameters. Rapid small angle line-of-sight repositioning and precision line-of-sight stabilization against a variety of disturbances are performed using both a single and multimode model. The single flexible mode model consists of a three-mass lightly damped translating system, referred to as the modified benchmarkd model. The multimode model consists of a single-axis reaction steering mirror mounted to the tip of a flexible truss-like support structure. Control-structure-interaction analysis of the reaction actuator control problem is performed first on th single-mode model as a function of flexible mode location, then with the multimode model as a function of inertial and elastic coupling between the reaction steering mirror and the flexible support structure. The analysis describes the control-structure-interaction effects on both stability and performance of a high gain line-of-sight PID controller.

Descriptors :   ACTUATORS, ANGLES, AXES, BANDWIDTH, CONTROL, COUPLING(INTERACTION), ELASTIC PROPERTIES, FLEXIBLE STRUCTURES, HIGH GAIN, INERTIAL SYSTEMS, LIMITATIONS, LINE OF SIGHT, MIRRORS, MODELS, MULTIMODE, POSITION(LOCATION), PRECISION, REACTION CONTROL SYSTEMS, RESPONSE, RIGIDITY, STABILIZATION, STEERING, SUPPORTS, TRUSSES.

Subject Categories : Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE