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Meeting	ACGS Committee Meeting 115 - Portland, OR - March 2015
Agenda Location	5 SUBCOMMITTEE D – DYNAMICS, COMPUTATIONS, AND ANALYSIS 5.2 Finite-Element Modeling of the Structural Dynamics of a Flying-Wing Research Drone
Title	Finite-Element Modeling of the Structural Dynamics of a Flying-Wing Research Drone
Presenter	Claudia Patricia Moreno
Affiliation	University of Minnesota
Available Downloads*	presentation
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Abstract	Aeroservoelastic models result from the interactions between the flight and structural dynamics of the flexible airframe. This presentation describes the structural model of a highly flexible vehicle using finite elements. Beam elements with torsion motion are used to construct the model of the vehicle. An equivalent rectangular section for the wing is obtained from stiffness and mass properties of the wing while the fuselage is assumed rigid. In addition, a ground vibration test is performed to obtain the natural frequencies of the vehicle. Results show that the natural frequencies obtained from the finite element model are accurate only for the bending vibration. Hence, model updating is required to match the natural torsional vibration of the model. An optimization problem is proposed to minimize the difference in modal frequencies and shapes between the model and the experimental data. The result is a finite element model that closely matches the experimental data.