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An optical position monitoring system for investigation of model displacement and transient motion of wind tunnel models

Otter, D. and Möller, T. J. and Bütefisch, K. A. (2001) An optical position monitoring system for investigation of model displacement and transient motion of wind tunnel models. In: ICIASF 2001 Record, pp. 140-143. 19th International Congress on Instrumentation in Aerospace Simulation Facilties (ICIASF), 27.-30. August 2001, Cleveland, Oh. (USA). ISBN 0-7803-7022-8.

Full text not available from this repository.

Abstract

In complex wind tunnel test simulating unsteady manoeuvres, e.g. transient rolling motion at large angles of attack, it is necessary to determine the actual position of the wind tunnel model, since existing measuring techniques could not give reliable data of the position of the wind tunnel model, e.g. angle of attack, rolling angle. To solve the described problem an optical system has been developed which basically focuses the model, or part of it, onto an image plane where a line sensor is placed, utilising four independent line CCD sensors with a data rate of 6.4 kHz. To evaluate the data from the line sensors digital image processing is used to transform the data from the sensor frame of reference to the wind tunnel co-ordinate system leading to the actual model position within the wind tunnel frame of reference. In the presented experiment the displacement and motion of a rolling delta wing model in the DNW-TWG has been investigated. The position of a delta wing has been determined by means of the newly developed optical position monitoring system of DLR. The investigations have been performed in the 1 m x 1 m test section of the DNW-TWG wind tunnel. The wind tunnel was operated at Mach numbers up to 0.85. The model has a sweep angle L= 65° and a length of 433 mm, the maximum corresponding Reynolds number based on the model length in the present experiment is 8.5*106. The angle of incidence has been varied between 9° and 25°. The largest applied rolling rate was w=3200 °/s. A typical model rolling motion in an interval between 0° and 90° leads to 72 position data for w=3200 °/s.

Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=2001, monograph_id=4.1,
Title:An optical position monitoring system for investigation of model displacement and transient motion of wind tunnel models
Authors:
AuthorsInstitution or Email of Authors
Otter, D.UNSPECIFIED
Möller, T. J.UNSPECIFIED
Bütefisch, K. A.UNSPECIFIED
Date:2001
Journal or Publication Title:ICIASF 2001 Record
Refereed publication:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 140-143
Editors:
EditorsEmail
Wernet, Mark (Chairmann)UNSPECIFIED
ISBN:0-7803-7022-8
Status:Published
Keywords:wind tunnel measurement technique, optical measurent technique
Event Title:19th International Congress on Instrumentation in Aerospace Simulation Facilties (ICIASF)
Event Location:Cleveland, Oh. (USA)
Event Type:international Conference
Event Dates:27.-30. August 2001
Organizer:NASA, Glenn Research Center and OAI, OH, USA
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Flight Physics
Location: Bonn-Oberkassel
Institutes and Institutions:Projektträger im DLR
Deposited By: Ilka Micknaus
Deposited On:20 Feb 2006
Last Modified:14 Jan 2010 17:07

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