TitleDownwash Detection and Avoidance with Small Quadrotor Helicopters
Publication TypeJournal Article
Year of Publication2016
AuthorsYeo, DW, Sydney, N, Paley, D, Sofge, D
JournalJournal of Guidance, Control and Dynamics, AIAA,
Pagination1-20
Abstract

By using four independent rotors to provide lift and control moments, the quadrotor helicopter provides researchers with a small, mechanically simple and effective vertical-flight platform. Typically, the lift and resultant torque due to each rotor can be approximated with simple aerodynamic models. Although these models have proven to be adequate in low advance-ratio flight conditions, they cannot account for the flow conditions associated with high-speed flight or the presence of large disturbances such as wind gusts or downwash from nearby rotorcraft. Real-time measurements of the flow-field around a flying vehicle provide a description of the flight conditions that would otherwise be impossible with only inertial-based instruments. This paper introduces a pressure-probe flow measurement system developed for a small quadrotor. The design, fabrication and calibration of the instrumentation package are presented along with data from autonomous flight trials using motion-capture-based positioning data. As a demonstration of the capabilities afforded by onboard flow sensing, a strategy for avoiding the downwash of a neighboring rotorcraft is proposed and demonstrated.

pdf: 
https://www.nrl.navy.mil/itd/aic/sites/www.nrl.navy.mil.itd.aic/files/pdfs/Downwash-Detection-and-Avoidance-with-Small-Quadrotor-Helicopters-2016.pdf
NRL Publication Release Number: 
16-1231-0098