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Frequency-time spectral analysis of ...

Vellathottam, George V.

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Frequency-time spectral analysis of helicopter turbulence and response in forward flight.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Frequency-time spectral analysis of helicopter turbulence and response in forward flight./
Author:	Vellathottam, George V.
Description:	142 p.
Notes:	Source: Masters Abstracts International, Volume: 29-04, page: 0708.
Contained By:	Masters Abstracts International29-04.
Subject:	Applied Mechanics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1343148

Frequency-time spectral analysis of helicopter turbulence and response in forward flight.
Vellathottam, George V.

Frequency-time spectral analysis of helicopter turbulence and response in forward flight. - 142 p.

Source: Masters Abstracts International, Volume: 29-04, page: 0708.

Thesis (M.S.E.)--Florida Atlantic University, 1991.

A closed-form solution of a frequency-time spectrum for the dominant vertical turbulence velocity at an arbitrary blade station is developed. This solution makes it possible to explain qualitatively the turbulence energy transfer due to rotational velocity from the low-frequency region (Subjects--Topical Terms:

1018410
Applied Mechanics.

Frequency-time spectral analysis of helicopter turbulence and response in forward flight.
LDR:01956nmm 2200289 4500 001 1831631
005 20070518124333.5
008 130610s1991 eng d
035 $a (UnM)AAI1343148
035 $a AAI1343148
040 $a UnM $c UnM
100 1 $a Vellathottam, George V. $3 1920405
245 1 0 $a Frequency-time spectral analysis of helicopter turbulence and response in forward flight.
300 $a 142 p.
500 $a Source: Masters Abstracts International, Volume: 29-04, page: 0708.
500 $a Adviser: G. H. Gaonkar.
502 $a Thesis (M.S.E.)--Florida Atlantic University, 1991.
520 $a A closed-form solution of a frequency-time spectrum for the dominant vertical turbulence velocity at an arbitrary blade station is developed. This solution makes it possible to explain qualitatively the turbulence energy transfer due to rotational velocity from the low-frequency region ( $1 P) region with the occurrence of spectral peaks and split peaks at 1P/2, 1P, 3P/2, 2P etc. Comparison of blade responses to blade- and body-fixed turbulence is also presented over a comprehensive range of turbulence scale length and advance ratio.
520 $a A major contribution is to formulate both the cyclostationary turbulence and blade response by the frequency-time spectra, which predict simultaneously the time- and frequency-dependent characteristics such as the energy contained in the frequency and time intervals. For low-altitude and low-advance-ratio flights, such as nap-of-the earth or NOE flights, rotational velocity effects on turbulence modeling qualitatively affect the prediction of turbulence and response statistics. (Abstract shortened with permission of author.)
590 $a School code: 0119.
650 4 $a Applied Mechanics. $3 1018410
650 4 $a Engineering, Aerospace. $3 1018395
650 4 $a Engineering, Mechanical. $3 783786
690 $a 0346
690 $a 0538
690 $a 0548
710 2 0 $a Florida Atlantic University. $3 1017837
773 0 $t Masters Abstracts International $g 29-04.
790 1 0 $a Gaonkar, G. H., $e advisor
790 $a 0119
791 $a M.S.E.
792 $a 1991
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1343148