Statistics – Methodology
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991phdt........75m&link_type=abstract
Thesis (PH.D.)--STANFORD UNIVERSITY, 1991.Source: Dissertation Abstracts International, Volume: 52-01, Section: B, page: 0481.
Statistics
Methodology
Damping, Gravity Wave
Scientific paper
A novel design methodology that integrates both control system and structural design activities has been developed and applied to an experimental apparatus. The procedure is motivated by applications in aerospace, machine tools, and laboratory physics experiments. In current aerospace designs, for example, control system and structural design activities are virtually independent. Furthermore, passive damping is a key parameter that has not been exploited in structural designs. These conditions limit design potential, particularly when system performance requires closed-loop control bandwidths that exceed the lowest natural frequencies of a structure. Including passive damping in structures has many potential advantages. Examples include reducing structural response to disturbances, reducing the need for control, permitting increased controller bandwidth, and providing robustness to parameter variations and unmodeled dynamics. Potential costs are added mass, reduced structural stiffness, and damping properties that are sensitive to operating conditions. The modular design procedure, which is automated in software, identifies an optical allocation of damping for controlled linear structures. The procedure is unique in that it modifies both structural topology and structural parameters to identify effective locations and levels of damping. In doing so, the procedure quantifies the payoff of damping a controlled structure. The principal application of this procedure was to the vibration isolation system of the Stanford Gravity Wave Experiment. This isolation system is a complex, high -order, six degrees-of-freedom, very lightly damped structure which is maintained at low temperature near the absolute zero. The resulting allocation of damping reflected a reasonable trade-off between the unique set of multi-disciplinary goals used in the optimization. These goals included minimizing the peak steady-state strain in the system, the total heat dissipation in damping elements, and the resonance Q of the isolation system's vibration modes; and maximizing the isolation and resonance Q of the experiment's antenna. The damping system for the Stanford Gravity Wave Experiment isolation structure has been designed. Among many hardware constraints, this system must damp micrometer level motion in six degrees-of-freedom at ultra-low temperatures. Magnetic eddy-current dampers will comprise the damping system. These dampers have been cryogenically tested and their ability to meet system requirements has been established.
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