On the adequacy of modeling turbulence and related effects on helicopter responseThe present closed-form solution of a frequency-time spectrum for the dominant vertical turbulence velocity at an arbitrary blade station accounts for the instantaneous turbulence-energy transfer due to rotational velocity from the low-frequency to the high-frequency region, with the occurrence of several spectral peaks and split peaks. Comparisons of blade-flapping response to blade- and body-fixed turbulence is also presented, over a range of turbulence-scale length and advance ratios. Attention is given to the use of cyclostationary turbulence and blade-response frequency-time spectra to simultaneously predict temporal and frequency characteristics. Rotational velocity substantially affects response statistics in low-altitude, low advance-ratio flight.
Document ID
19920064321
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
George, V. V. (NASA Ames Research Center Moffett Field, CA, United States)
Gaonkar, G. H. (Florida Atlantic University Boca Raton, United States)
Prasad, J. V. R. (NASA Ames Research Center Moffett Field, CA, United States)
Schrage, D. P. (Georgia Institute of Technology Atlanta, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1991
Subject Category
Aircraft Design, Testing And Performance
Meeting Information
Meeting: AHS International Specialists'' Meeting on Rotorcraft Basic Research