Title page for ETD etd-03122009-040526


Type of Document Master's Thesis
Author Kahn, Steven Phillip
URN etd-03122009-040526
Title Experimental verification and development of structural identification techniques on a grid
Degree Master of Science
Department Engineering Mechanics
Advisory Committee
Advisor Name Title
Norris, Mark A. Committee Chair
Meirovitch, Leonard Committee Member
Mook, Dean T. Committee Member
Keywords
  • Space frame structures
Date of Defense 1990-04-05
Availability restricted
Abstract

The work that is reported herein deals with system identification methods for large flexible structures. Proposed space missions for the future include the deployment of large flexible structures, e.g., NASA's proposed space station. These structures must be controlled to maneuver the structure to desired locations and to suppress unwanted vibration. Before controlling any structure, it is necessary to have an accurate model which may include accurate estimates of the structure's natural frequencies and mode shapes. System identification is an important process that precludes system control. Precision structures such as those proposed for the Space Based Laser or the Aerospace Plane require high performance control systems which will require robust, computationally efficient system identification algorithms. This work attempts to experimentally verify, develop, and compare existing identification algorithms to determine their properties and improve their efficiency towards potential applicability in a space environment. To this end, we consider the Temporal Correlation Method and the Eigensystem Realization Algorithm. The algorithms are implemented on the Astronautics Laboratory Grid structure, and the results of the algorithms are compared in the presence of damping, noise, and residual modes. In addition, the Temporal Correlation Method is shown to be a constrained version of the Eigensystem Realization Algorithm for cases of light damping.

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