Identifizierung flugdynamischer Kenngrößen eines künstlich stabilisierten Raumflugzeugs

Enhanced methods for the determination of flightdynamic parameters are presented in this study. Because of their simple setup this study concentrates on two methods that have to be modified to study the unstable spaceplane configuration PHOENIX. In the wind tunnel method of free oscillation the wind tunnel model is equipped with electrically driven control surfaces and a feedback control system to operate the model in the test section. For the second method a radio controlled model of the spaceplane is dropped from another unmanned aerial vehicle to collect data during its flight. The application of feed forward- and feed back control systems enhances this method to make it applicable to unstable configurations with a high wing loading. In a first step an equation error method is used to identify the parameters of quasi-stationary aerodynamic models. It is shown, that the parameters of the equations for lift, pitch moment and rolling moment show a significant dependency on the frequency of motion. Therefore unsteady aerodynamic models are introduced that integrate these frequency effects with the help of transfer functions. The identified parameters of these unsteady models are shown to be independent from the frequency of motion. A comparison of wind tunnel data with data from the flight tests makes clear, that it is possible to identify precise parameters of quasi-stationary models with this kind of flight tests. The discrepancies between results from the two methods are in the same order than in much more ambitious flight test campaigns.

Grantor dc:publisher

Publikationsserver der RWTH Aachen University

Year dc:date

2005

Author dc:creator

• Kirschstein, Stefan

Contributors dc:contributor

• Alles, Wolfgang

• info:eu-repo/classification/ddc/620
• Raumflugkörper
• Flugzeugaerodynamik
• Mathematisches Modell
• Strömungstechnische Kennzahl
• Parameteridentifikation
• Windkanal
• Flugversuch
• Ingenieurwissenschaften
• Parameteridentifizierung
• Windkanalversuche
• Flugversuche
• dynamische Derivative
• instationäre Aerodynamik

Statement dc:rights

• info:eu-repo/semantics/openAccess

Language dc:language

ger

Identifier

https://publications.rwth-aachen.de/search?p=id:%22RWTH-CONV-123673%22

OAI identifier oai:identifier

oai:publications.rwth-aachen.de:62078