Reduced Structural Modeling of Integrally-Strained Slender Wings
نویسنده
چکیده
This paper introduces a procedure to model the dynamics of active slender structures with embedded actuators and sensors. The objective is to construct a loworder high-accuracy formulation for easy parameterization of the design space in nonlinear aeroelastic analysis. Main assumptions are small local strains and local rotations, large deflections and global rotations, quasielectrostatic behavior, linear electroelastic constitutive relations, and slenderness of the structure. The model also includes anisotropic material properties, electroelastic coupling, hygrothermal effects, and is integrated with the vehicle flight dynamics. The condition of slenderness is used to define a three-step analysis scheme based on asymptotic approximations to the electroelastic field, which can adequately represent the passive or active structural dynamics of a quite general class of air vehicles, including future morphing vehicle concepts. Two main configurations are investigated in this work: a rotor blade with embedded piezoceramics (Active Twist Rotor), and a joined-wing configuration for unmanned SensorCraft. On the Active Twist Rotor, a deformation mode for the camber bending is added to classical beam strain measures. Then, the response of this typical plate mode to the embedded actuation is studied and quantified within a 1-D model. On the SensorCraft, the structural characterization of the aircraft with joinedwing and flexible fuselage are investigated and compared to detailed 3-D build-up finite-element models.
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