Flutter of the unmanned aerial vehicle from composite materials with Wing-Tail Boom Configuration

DOI: 10.34759/trd-2020-113-19

Аuthors

Nagornov A. Y.

Moscow Aviation Institute (National Research University), 4, Volokolamskoe shosse, Moscow, А-80, GSP-3, 125993, Russia

e-mail: andrey-nagornov@mail.ru

Abstract

A mathematical model for calculating the flutter of a composite unmanned aerial vehicle (UAV) with a wing-tail boom configuration is presented. The mathematical model is built in the Nastran software with a finite element method (FEM). The elastic model of the device is represented by a set of beams connected through flexible joints. The aerodynamic model is constructed using the doublet-lattice method (DLM). To obtain the critical flutter speed from the rotational natural frequency of the control surfaces in the finite element model varied stiffness elements «CELAS2» modeling actuators of the controls. The design features of the device under study are considered. Calculations of flutter shapes are presented and the results are analyzed.

From the results obtained, it can be concluded that a UAV with a wing-tail boom configuration is subject to flutter of control surfaces, which is due to weight unbalancing of the controls.

The considered design scheme of the UAV has low natural frequencies of tail due to the elasticity of the tail beams and the wing, as well as the elasticity of the wing joints in the fuselage.

NX Nastran software package can be successfully used to calculate the flutter of composite aircraft. The advantages of the finite element method implemented in NX Nastran include the possibility of high detail of the computational model in order to more accurately simulate real aircraft structures. However, when verifying a computational model developed using FEM, difficulties may arise: the higher the model detail, the more difficult it is to correct the constructed model based on the results of the experiment.

Keywords:

unmanned aerial vehicle, mathematical model, composite material, flutter, finite element method (FEM)

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