Rotational Modes of Motion for an Aerodynamic Pendulum with a Vertical Rotation Axis / L.A. Klimina // Vestn. Mosk. Univ., Matem. Mekhan. 2009. № 5. P. 71-75 [Moscow Univ. Mech. Bulletin. Vol. 64, No 5, 2009. P. 126-129]
An aerodynamic pendulum in a steady horizontal wind flow is studied in connection with modeling a wind-receiving element of a straight winged vertical axis wind turbine (VAWT). The model of aerodynamic action on the pendulum is assumed to consist of two components: the quasi-steady one (using data obtained in stationary wind tunnel experiments) and the non-steady one (taking into account the added masses effect). The question of existence of stable and unstable rotational modes is studied analytically (via the Poincare-Pontriagin method) and numerically. The dependence on parameters responsible for a viscous friction at the shaft and for an influence of added masses is taken into account.
Key words: VAWT, quasi-steady model of aerodynamic load,
rotational mode of motion, parametrical analysis.