Accession Number:

AD0255191

Title:

EXPERIMENTAL EVALUATION OF THE DECELERATION OF ALUMINUM CYLINDERS ROTATING IN A MAGNETIC FIELD AND COMMENTS ON MAGNETIC DAMPING OF A FLYWHEEL CONTROL,

Descriptive Note:

Corporate Author:

NATIONAL AERONAUTICS AND SPACE ADMINISTRATION WASHINGTON D C

Personal Author(s):

Report Date:

1961-04-01

Pagination or Media Count:

35.0

Abstract:

An experimental investigation was 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 91, 41, and 21 and a wall thickness of 0.254 centimeter and one cylinder with a fineness ratio of 61 and a wall thickness of 0.508 centimeters. 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 61. Hoopers theory is in agreement with the experimental results throughout the range of fineness ratios tested. A utilization of the magnetic damping to prevent overspeeding of a flywhell used in a satellite orientation system is discussed. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE