In this paper, the classical (scalar) Preisach model is used to predict hysteresis observed in several Macro-Fiber Composite actuated piezocomposite bimorph devices: 1) two cantilevered beams, 2) a simply supported thin airfoil, and 3) a cascading bimorph thick airfoil. This paper contributes to the research field by examining the effectiveness of the scalar Preisach model for operational and wind-tunnel tested piezocomposite airfoils in the presence of aerodynamic and inertial loading and subjected to two different electrical boundary conditions. A low-speed opencircuit wind tunnel is used for experimental analysis. The flow speed is used as a parameter to understand the effect of nonuniform aerodynamic loading on the accuracy of the model. In addition, the excitation frequency is used as a parameter to understand the effect of inertial (mass) loading. It was observed that the aerodynamic loading, up to 19 m=s, has a negligible effect on the aerodynamic output of the airfoils considered in this research. The classical Preisach model is capable of predicting the hysteresis observed in all of the samples tested with an average prediction error less than 6.8% for a 0.5 Hz input signal and less than 9.3% for a 1 Hz input signal. The increasing-decreasing and decreasing-increasing first-order transition curves are both found to be equally successful in developing the Preisach model for all samples.
All Science Journal Classification (ASJC) codes
- Aerospace Engineering