Accession Number:

ADA243991

Title:

Adaptive and Nonlinear Control for Rapid Maneuvering of Flexible Structures

Descriptive Note:

Final rept. Sep 1987-Jun 1991

Corporate Author:

INTEGRATED SYSTEMS INC SANTA CLARA CA

Personal Author(s):

• Kosut, Robert L.
• Kabuli, Guntekin M.

Report Date:

1991-10-01

Pagination or Media Count:

91.0

Abstract:

This report describes research results on the design of feedback controllers for rapid slewing of flexible space structures, such as optical tracking systems. Two approaches evolved during this research. The first approach modifies the exact rigid-body time-optimal control so as to account for chattering near zero tracking error and robustness to flexible modes close to the controller bandwidth. Efforts to make this controller adaptive are also presented. The second approach uses a combination of feed forward trajectory generation with a standard linear feedback in the inner loop. The feed-forward generator is designed by solving a convex optimization problem which is an approximation to the time-optimal problem. The latter approach is effective for multiple input multiple output systems with independent actuator saturation constraints.

Descriptors:

• *CONTROL SYSTEMS
• *FLEXIBLE STRUCTURES
• LINEAR SYSTEMS
• CONTROL
• OPTICAL EQUIPMENT
• MANEUVERABILITY
• FORWARD AREAS
• OPTIMIZATION
• ADAPTIVE CONTROL SYSTEMS
• SPACE SYSTEMS
• SATURATION
• NONLINEAR SYSTEMS
• INTERNAL
• FEEDBACK
• ACTUATORS
• BANDWIDTH
• LOOPS
• TRAJECTORIES
• FEEDING
• SLEWING
• OPTICAL TRACKING
• CONVEX BODIES

Subject Categories:

• Astronautics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE