Finite Element Aircraft Simulation of Turbulence

https://doi.org/10.21949/14027921997PDFTech ReportAtmospheric turbulenceWakesRotary wing aircraftPropeller driven aircraftFlight characteristicsFlight dynamicsDynamic modelsComputer modelsResearchAutospectraDiscrete gusts.Simulation of Rotor Blade Element Turbulence (SORBET) modelStochastic turbulenceTransport delayair wake modelingturbulence modelingMcFarland, R.E.Ames Research CenterNTL-AVIATION-AVIATIONUS Transportation CollectionA Simulation of Rotor Blade Element Turbulence (SORBET) model has beendeveloped for realtime aircraft simulation that accommodates stochasticturbulence and distributed discrete gusts as a function of the terrain. Thismodel is applicable to conventional aircraft, V/STOL aircraft, and disc rotormodel helicopter simulations. Vehicle angular activity in response toturbulence is computed from geometrical and temporal relationships rather thanby using the conventional continuum approximations that assume uniform gustimmersion and low frequency responses. The model produces rotational rates aswell as air mass translational velocities in response to both stochastic anddeterministic disturbances, where the discrete gusts and turbulence magnitudesmay be correlated with significant terrain features or ship models. 47p.84