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A State-Space Model of a Large, Lightly Damped Space Structure Using the Eigensystem Realization Algorithm.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
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Large, lightweight space structures of the future will require state-of-the-art vibration suppression systems. To design such a system, it is necessary to have a mathematical model that adequately describes the motion of the system. Coulomb damping compensation was utilized to remove a known nonlinearity from the frequency response functions obtained from the Passive and Active Control of Space Structures PACOSS Dynamic Test Article DTA. Via the Eigensystem Realization algorithm ERA, the frequency response functions were then used to generate a mathematical representation of the structures dynamics. Two models were obtained. The first model, without friction compensation, acted as a baseline. The second was obtained using friction compensation. Comparing the models, it was determined that active friction compensation was worthwhile and resulted in a more accurate mathematical description of the system.
APPROVED FOR PUBLIC RELEASE