Search results for "Stability derivatives"

showing 3 items of 3 documents

An Extended Kalman Filter-Based Technique for On-Line Identification of Unmanned Aerial System Parameters

2015

ABSTRACT: The present article deals with the identification, at the same time, of aircraft stability and control parameters taking into account dynamic damping derivatives. Such derivatives, due to the rate of change of the angle of attack, are usually neglected. So the damping characteristics of aircraft dynamics are attributed only on pitch rate derivatives. To cope with the dynamic effects of these derivatives, authors developed devoted procedures to estimate them. In the present paper, a complete model of aerodynamic coefficients has been tuned-up to identify simultaneously the whole set of derivatives. Besides, in spite of the employed reduced order model and/or decoupled dynamics, a s…

Aircraft dynamic derivativesEngineeringUnmanned Aerial SystemAngle of attackbusiness.industryOn-line identificationLongitudinal static stabilityExtended Kalman FilterAerospace EngineeringAerodynamicsFlight control surfacesStability derivativesExtended Kalman filterNoiseControl theorySix degrees of freedombusinessJournal of Aerospace Technology and Management
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Optimal Flight Path Determination in Turbulent Air: A Modified EKF Approach

2017

By using the Extended Kalman Filter an accurate path following in turbulent air is performed. The procedure employs simultaneously two different EKFs: the first one estimates disturbances, the second one affords to determine the necessary controls displacements for rejecting those ones. To tune the EKFs an optimization algorithm has been designed to automatically determine Process Noise Covariance and Measurement Noise Covariance matrices. The first filter, by using instrumental measurements gathered in turbulent air, estimates wind components. The second one obtains command laws able to follow the desired flight path. To perform this task aerodynamic coefficients have been modified. Such a…

Filter (large eddy simulation)NoiseExtended Kalman filterControl theoryComputer scienceLongitudinal static stabilityPharmacology (medical)AerodynamicsCovarianceStability (probability)Stability derivativesAerotecnica Missili & Spazio
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An EKF Based Method for Path Following in Turbulent Air

2017

An innovative use of the Extended Kalman Filter (EKF) is proposed to perform both accurate path following and adequate disturbance rejection in turbulent air. The tuned up procedure employs simultaneously two different EKF: the first one estimates gust disturbances, the second one estimates modified aircraft parameters. The first filter, by using measurements gathered in turbulent air, estimates both aircraft states and wind components. The second one, by using the estimated disturbances, obtains command laws that are able to reject disturbances. The predictor of the second EKF uses the estimated wind components to solve motion equations in turbulent air. Besides a set of unknown stability …

Fluid Flow and Transfer Processes020301 aerospace & aeronautics0209 industrial biotechnologyEngineeringbusiness.industryTurbulenceSettore ING-IND/03 - Meccanica Del VoloAerospace EngineeringEquations of motion02 engineering and technologyAerodynamicsStability (probability)Stability derivativesSet (abstract data type)Extended Kalman filterFilter (large eddy simulation)020901 industrial engineering & automation0203 mechanical engineeringControl and Systems EngineeringControl theoryAdaptive control laws Extended Kalman Filter Trajectory trackingElectrical and Electronic EngineeringbusinessPhysics::Atmospheric and Oceanic PhysicsInternational Review of Aerospace Engineering (IREASE)
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