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Shake test of rotor test apparatus in the 40- by 80-foot wind tunnel

Author
Johnson, W.
Published
Feb 1, 1975.
Physical Description
1 electronic document
Additional Creators
Biggers, J. C.
Online Version

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Restrictions on Access
Unclassified, Unlimited, Publicly available.
Free-to-read Unrestricted online access
Summary
A shake test was conducted to determine the dynamic characteristics of a rotor test apparatus on strut systems. The rotor-off hub transfer function (acceleration per unit force as a function of frequency) was measured in the longitudinal and lateral directions, using a combination of broadband and discrete frequency excitation techniques. The dynamic data is summarized for the configurations tested, giving the following properties for each mode identified: the natural frequency, the hub response at resonance, and the fixed system damping. The complete transfer functions are presented, and the detailed test results are included as an appendix. Data analysis techniques developed to obtain on-line measurements of the system modal properties, including the damping coefficient and the damping ratio are discussed.
Other Subject(s)
Collection
NASA Technical Reports Server (NTRS) Collection.
Note
Document ID: 19750012278.
Accession ID: 75N20350.
NASA-TM-X-62418.
A-5973.
Terms of Use and Reproduction
No Copyright.
View MARC record | catkey: 15740569