FLAP-LAG STABILITY WITH DYNAMIC INFLOW BY THE METHOD OF MULTIBLADE COORDINATES.

Gopal H. Gaonkar; David A. Peters

FLAP-LAG STABILITY WITH DYNAMIC INFLOW BY THE METHOD OF MULTIBLADE COORDINATES.

Gopal H. Gaonkar
, David A. Peters

Department of Mechanical Engineering & Materials Science

Research output: Contribution to conference › Paper › peer-review

1 Scopus citations

Abstract

Rotor flap-lag stability in forward flight is studied with and without dynamic inflow feedback via a multiblade coordinate transformation (MCT). The algebra of MCT is found to be so involved that it requires checking the final equations by independent means. Accordingly, an assessment of three derivation methods is given. Numerical results are presented for three- and four-bladed rotors up to an advance ratio of 0. 5. While the constant-coefficient approximation under trimmed conditions is satisfactory for low-frequency modes, it is not satisfactory for high-frequency modes or for untrimmed conditions.

Original language	English
State	Published - 1979
Event	Collect Tech Pap AIAA ASME Struct Struct Dyn Mater Conf 20th - St Louis, MO, USA Duration: Apr 4 1979 → Apr 6 1979

Conference

Conference	Collect Tech Pap AIAA ASME Struct Struct Dyn Mater Conf 20th
City	St Louis, MO, USA
Period	04/4/79 → 04/6/79

Cite this

@conference{2a5065c5047d43e5ab57960e8f417977,

title = "FLAP-LAG STABILITY WITH DYNAMIC INFLOW BY THE METHOD OF MULTIBLADE COORDINATES.",

abstract = "Rotor flap-lag stability in forward flight is studied with and without dynamic inflow feedback via a multiblade coordinate transformation (MCT). The algebra of MCT is found to be so involved that it requires checking the final equations by independent means. Accordingly, an assessment of three derivation methods is given. Numerical results are presented for three- and four-bladed rotors up to an advance ratio of 0. 5. While the constant-coefficient approximation under trimmed conditions is satisfactory for low-frequency modes, it is not satisfactory for high-frequency modes or for untrimmed conditions.",

author = "Gaonkar, \{Gopal H.\} and Peters, \{David A.\}",

year = "1979",

language = "English",

note = "Collect Tech Pap AIAA ASME Struct Struct Dyn Mater Conf 20th ; Conference date: 04-04-1979 Through 06-04-1979",

}

TY - CONF

T1 - FLAP-LAG STABILITY WITH DYNAMIC INFLOW BY THE METHOD OF MULTIBLADE COORDINATES.

AU - Gaonkar, Gopal H.

AU - Peters, David A.

PY - 1979

Y1 - 1979

N2 - Rotor flap-lag stability in forward flight is studied with and without dynamic inflow feedback via a multiblade coordinate transformation (MCT). The algebra of MCT is found to be so involved that it requires checking the final equations by independent means. Accordingly, an assessment of three derivation methods is given. Numerical results are presented for three- and four-bladed rotors up to an advance ratio of 0. 5. While the constant-coefficient approximation under trimmed conditions is satisfactory for low-frequency modes, it is not satisfactory for high-frequency modes or for untrimmed conditions.

AB - Rotor flap-lag stability in forward flight is studied with and without dynamic inflow feedback via a multiblade coordinate transformation (MCT). The algebra of MCT is found to be so involved that it requires checking the final equations by independent means. Accordingly, an assessment of three derivation methods is given. Numerical results are presented for three- and four-bladed rotors up to an advance ratio of 0. 5. While the constant-coefficient approximation under trimmed conditions is satisfactory for low-frequency modes, it is not satisfactory for high-frequency modes or for untrimmed conditions.

UR - https://www.scopus.com/pages/publications/85095903590

M3 - Paper

AN - SCOPUS:85095903590

T2 - Collect Tech Pap AIAA ASME Struct Struct Dyn Mater Conf 20th

Y2 - 4 April 1979 through 6 April 1979

ER -

FLAP-LAG STABILITY WITH DYNAMIC INFLOW BY THE METHOD OF MULTIBLADE COORDINATES.

Abstract

Conference

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