elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

Evaluation of the Controllability of a High-Altitude Platform in Atmospheric Disturbances Based on Pilot-in-the-Loop Simulations

Hasan, Yasim Julian and Roeser, Mathias Stefan and Voigt, Andreas E. (2021) Evaluation of the Controllability of a High-Altitude Platform in Atmospheric Disturbances Based on Pilot-in-the-Loop Simulations. In: Deutscher Luft- und Raumfahrtkongress. 70. Deutscher Luft- und Raumfahrtkongress, 31. Aug. - 02. Sep. 2021, Bremen und online.

[img] PDF - Only accessible within DLR
1MB

Abstract

In the context of the project HAP, the German Aerospace Center (DLR) is currently developing a solar-powered high-altitude platform that is supposed to be stationed in the stratosphere for 30 days. The development process includes the design of the aircraft, its manufacturing and a flight test campaign. Furthermore, a high-altitude demonstration flight is planned. The aircraft operates at extremely low airspeeds, being in the magnitude of around 10 m/s equivalent airspeed, and is therefore profoundly susceptible to atmospheric disturbances. This is particularly critical at low altitudes, where the airspeed is lowest. Hence, both time and location for take-off, landing or low-altitude flight test campaigns need to be selected thoroughly in order to reduce the risk of a loss of aircraft. In this regard, the knowledge about the operational limits of the aircraft with respect to atmospheric conditions is crucial. The less these limits are known, the more conservative the decision about whether to perform a flight on a certain day or not tends to be. On the contrary, if these limits have been adequately investigated, the amount of days and locations that are assessed as suitable for performing a flight might increase. This paper deals with a pilot-in-the-loop simulation campaign that is conducted in order to assess the controllability of the high-altitude platform in atmospheric disturbances. Within this campaign, the pilots are requested to perform practical tasks like maintaining track or altitude, flying a teardrop turn or perform a landing while the aircraft is subject to different atmospheric disturbances including constant wind, wind shear, continuous turbulence, and discrete gusts of different magnitudes. This paper describes the desktop simulator used for the campaign, outlines the entity of investigated test points and presents the assessment method used to evaluate the criticality of the respective disturbances. Finally, a set of restrictions on the acceptable wind conditions for the high-altitude platform are found. The underlying limits comprise a constant wind speed of 3.0 m/s in any direction, except during landing, maximum wind shear of 0.5 m/s^2 and gusts with peak speeds of 1.5 m/s to 2.0 m/s, depending on the direction.

Item URL in elib:https://elib.dlr.de/147221/
Document Type:Conference or Workshop Item (Speech)
Title:Evaluation of the Controllability of a High-Altitude Platform in Atmospheric Disturbances Based on Pilot-in-the-Loop Simulations
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Hasan, Yasim JulianYasim.Hasan (at) dlr.dehttps://orcid.org/0000-0002-5081-223X
Roeser, Mathias Stefanmathias.roeser (at) dlr.dehttps://orcid.org/0000-0002-9529-7518
Voigt, Andreas E.andreas.voigt (at) dlr.deUNSPECIFIED
Date:September 2021
Journal or Publication Title:Deutscher Luft- und Raumfahrtkongress
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:high-altitude platform, solar-powered, flight dynamics, gust encounters, atmospheric disturbances, pilot-in-the-loop simulations
Event Title:70. Deutscher Luft- und Raumfahrtkongress
Event Location:Bremen und online
Event Type:national Conference
Event Dates:31. Aug. - 02. Sep. 2021
Organizer:Deutsche Gesellschaft für Luft- und Raumfahrt – Lilienthal-Oberth e. V. (DGLR)
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Components and Systems
DLR - Research area:Aeronautics
DLR - Program:L CS - Components and Systems
DLR - Research theme (Project):L - Unmanned Aerial Systems
Location: Braunschweig
Institutes and Institutions:Institute of Flight Systems
Institute of Flight Systems > Flight Dynamics and Simulation
Deposited By: Hasan, Yasim Julian
Deposited On:01 Feb 2022 09:19
Last Modified:01 Feb 2022 09:19

Repository Staff Only: item control page

Browse
Search
Help & Contact
Information
electronic library is running on EPrints 3.3.12
Copyright © 2008-2017 German Aerospace Center (DLR). All rights reserved.