Aeroelastic Analysis of a Hingeless Rotor Using a Dynamic Wake Model

Wake Effects on Aeroelastic Stability of Hingeless and Bearingless Rotors

“…Furthermore, the numerical approach based on BET is used to compute the airloads. This BET forms the basis of most modern analysis of helicopter rotor aerodynamics because it can provide estimations of the radial and azimuthal distribution of aerodynamic loads over the rotor plane [9]. The aerodynamic parameters are estimated by obtaining lift, drag, and moment coefficients from a look-up table method thorough effective angle of attack.…”

“…However, in the preliminary design stage, aeroelastic analysis employing more simple fluid-structure interaction analysis models is preferable than the computational structural dynamics-computational fluid dynamics coupled model due to the problems of the computational time and cost [9,10]. In addition, a more accurately description of wake effects on the airloads and aeroelastic behavior is the main challenge [9]. The linear inflow model is one of the most commonly used approaches for estimating an induced inflow ratio; however, this model fails to accurately describe the real physics as it does not often account for unsteady three-dimensional aerodynamic effects, which may have critical impact on aerodynamic damping [9].…”

“…In addition, a more accurately description of wake effects on the airloads and aeroelastic behavior is the main challenge [9]. The linear inflow model is one of the most commonly used approaches for estimating an induced inflow ratio; however, this model fails to accurately describe the real physics as it does not often account for unsteady three-dimensional aerodynamic effects, which may have critical impact on aerodynamic damping [9]. Therefore, to predict the wake more accurately, this study introduced a free-wake method for an aeroelastic analysis as well as the linear inflow model.…”

“…Numerous numerical approaches for predicting the dynamic stability have been developed in the helicopter society. However, in the preliminary design stage, aeroelastic analysis employing more simple fluid-structure interaction analysis models is preferable than the computational structural dynamics-computational fluid dynamics coupled model due to the problems of the computational time and cost [9,10]. In addition, a more accurately description of wake effects on the airloads and aeroelastic behavior is the main challenge [9].…”