Federico Roizner, Moti Karpel

DOI Number: N/A

Conference number: IFASD-2017-172

A new parametric flutter margin method for linear and nonlinear stability analysis of aeroservoelastic systems is presented. The method is based on frequency response calculations with the system stabilized using a single parameter, which facilitates convenient response calculations with smooth response variations with respect to excitation frequency and air velocity. The frequency response functions are used for generating flutter margins with respect to the added parameter. The linear flutter or nonlinear limit-cycle-oscillation conditions are those at which the margins are zero. The nonlinear process starts with a linear one, to which nonlinear effects are added using a non-iterative first-order harmonic-balance procedure. Two numerical examples, based on a generic transport aircraft model, are given: a linear one with a simple gust-alleviation control system, and a nonlinear one with controlsurface actuator free play. The results demonstrate excellent agreement with those obtained using traditional flutter methods and nonlinear time-marching simulations.

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In Categories: 1. IFASD 2017, 1.Events, Aeroservoelasticity
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