Open AccessResearch on the Influences of Inertial Properties on Body Freedom Flutter for an Airfoil
Author(s) -
Pengxuan Lei,
Binbin Lv,
Hao Guo,
Xiping Kou,
Liting Yu
Publication year - 2019
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1300/1/012087
Subject(s) - flutter , aeroelasticity , airfoil , fuselage , aerodynamic center , wing , structural engineering , inertia , moment of inertia , aerodynamics , angle of attack , engineering , mechanics , physics , pitching moment , classical mechanics
For some flying-wing aircraft with large aspect ratio, the pitching inertia is small, which makes the longitudinal short-period modal frequency higher. Structural flexibility makes the 1st bending mode frequency lower. This makes the pitching mode of rigid body easily coupled with the elastic mode, resulting in aeroelastic instability, which is called body freedom flutter. There are many factors affecting the body freedom flutter characteristics. The rigid body inertia and structural characteristics of the fuselage and wing all have an impact on it. Taking the flutter of an airfoil as an example, the structural dynamics model of the system is established. The flutter characteristics of the airfoil were solved by analytical method. The effects of pitching inertia and fuselage mass on the flutter speed, flutter frequency and flutter mode shape were studied.