Accession Number:

ADA151784

Title:

Model Reduction Techniques Applied to the Control of Large Space Structures.

Descriptive Note:

Master's thesis,

Corporate Author:

AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING

Personal Author(s):

• Varhola,D. W.

Report Date:

1984-12-01

Pagination or Media Count:

126.0

Abstract:

Three model reduction techniques were examined for their applicability to large lightly damped systems. Frequency truncation, modal cost analysis, and approximate internal balancing methods are applied to the CSDL I and II models. Two actuatorsensor configurations are investigated on the CSDL I. Control of the CSDL I model is implemented through the use of the steady state optimal regulator theory, and the effect of various reduced order control models on the structures time response is detailed. Modal cost analysis and internal balancing yield is essentially equivalent results for the cases chosen, although the internal balancing technique provides more information concerning actuatorsensor effectiveness. These methods provide more effective reduced order models for higher order systems than simple frequency truncation. Keywords include Flexible Space Structures, Control, Model Reduction, Modal Analysis.

Descriptors:

• *CONTROL SYSTEMS
• *SPACECRAFT
• *FLEXIBLE STRUCTURES
• FREQUENCY
• STEADY STATE
• DETECTORS
• COST ANALYSIS
• DAMPING
• OPERATIONAL EFFECTIVENESS
• CONFIGURATIONS
• ACTUATORS
• TRUNCATION

Subject Categories:

• Test Facilities, Equipment and Methods
• Unmanned Spacecraft

Distribution Statement:

APPROVED FOR PUBLIC RELEASE