Search NASA⌕ Search

Engineering topics

Eide, Donald G.

Publications and source records attributed to Eide, Donald G..

Interaction between the space transportation systems and the Space Station architecture and operations and technology requirements

This study, limited to the interaction between the Space Station and an orbital transfer vehicle, illustrates the need to include the space transportation system and the station in a synergistic analysis to determine an overall operationally efficient system that takes full advantage of the potential for the exploration and exploitation of space. Included are examples of the effects of the mission model on the selection of a possible orbit transfer vehicle design and processing procedures at the station; safe, timely, and flexible transfer vehicle trajectories from GEO to the station; mechanical assists on the station for vehicle arrivals and departures that reduce the risk of contamination and collision; and a discussion of the need for efficient procedures for vehicle maintenance and processing at the station.

Eide, Donald G.↗

Experimental Evaluation of the Deceleration of Aluminum Cylinders Rotating in a Magnetic Field and Comments on Magnetic Damping of a Flywheel Control

An experimental investigation has been made to determine the magnetic deceleration of a closed-end cylinder rotating in a magnetic field by use of opposed ball and socket air bearing support. The theories of smythe and Hooper were compared with the experimental data for aluminum cylinders with fineness ratios of 9:1, 4:1, and 2:l and a wall thickness of 0.254 centimeter and one cylinder with a fineness ratio of 6:1 and a wall thickness of 0.508 centimeter. A method is outlined by which the magnetic damping coefficient for the spinning motion of a body of revolution may be determined experimentally. The theory of Smythe for a thin-walled cylinder predicts values greater than experimental results for fineness ratios of less than 6:l. Hooper's theory is in agreement with the experimental results through-out the range of fineness ratios tested. A utilization of the magnetic damping to prevent overspeeding of a flywheel used in a satellite orientation system is discussed.

Eide, Donald G.↗