Flow sensing, estimation and control for rotorcraft in ground effect

Author

Chin Gian Hooi ; Lagor, Francis D. ; Paley, Derek A.

Author_Institution

Dept. of Aerosp. Eng., Univ. of Maryland, College Park, MD, USA

fYear

2015

fDate

7-14 March 2015

Firstpage

1

Lastpage

8

Abstract

This paper describes a dynamic controller for rotorcraft landing and hovering in ground effect using feedback control based on flowfield estimation. The rotor downwash in ground effect is represented using a potential flow model selected for real-time use. A nonlinear dynamic model of the rotorcraft in ground effect is presented with open-loop analysis and closed-loop control simulation. Flowfield velocity measurements are assimilated into a grid-based recursive Bayesian filter to estimate height above ground. Height tracking in ground effect and landing are implemented with a dynamic linear controller. The overall framework is applicable for rotorcraft operation in ground effect and landing.

Keywords

Bayes methods; closed loop systems; feedback; flow sensors; helicopters; linear systems; nonlinear dynamical systems; open loop systems; recursive filters; closed-loop control simulation; dynamic controller; dynamic linear controller; feedback control; flow sensing; flowfield velocity measurements; grid-based recursive Bayesian filter; ground effect; height above ground estimation; height tracking; nonlinear dynamic model; open-loop analysis; potential flow model; real-time use; rotorcraft hovering; rotorcraft landing; rotorcraft operation; Aerodynamics; Atmospheric modeling; Bayes methods; Estimation; Nonlinear dynamical systems; Rotors; Sensors;

fLanguage

English

Publisher

ieee

Conference_Titel

Aerospace Conference, 2015 IEEE

Conference_Location

Big Sky, MT

Print_ISBN

978-1-4799-5379-0

Type

conf

DOI

10.1109/AERO.2015.7119297

Filename

7119297