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ACCURACY OF COMBINED 3D SURFACE DEFORMATION MESUREMENT AND 3D POSITION TRACKING IN A WIND TUNNEL

Michaelis , Dirk and Frahnert, Holger and Stasicki, Boleslaw (2004) ACCURACY OF COMBINED 3D SURFACE DEFORMATION MESUREMENT AND 3D POSITION TRACKING IN A WIND TUNNEL. ICEM12- 12th International Conference on Experimental Mechanics, 29 August - 2 September 2004 , Politecnico di Bari, Italy. ISBN 88 386 6273 - 8.

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Abstract

In this study the accuracy of a combined measurement of 3D surface deformation and the 3D position of an object in a wind tunnel is investigated. The aim of this study is the development of a system for the high accuracy measurement of an objects 3D position and deformation under wind load during simulated rapid maneuvers. In this situation, the 3D position and orientation of the model are considered to be unknown. The point tracking package PointTracker of the DaVis image processing software was used for the automatic detection of the 3D position and orientation of the model. The PointTracker calculates the 3D position from reflective markers placed on the model. The deformation is detected by the StrainMaster3D module of the DaVis software. In this software module a random structure on the model surface is used to calculate the 3D surface with a stereo camera setup. In a first experiment, the two measuring systems are compared by a combined measurement of marker positions and 3D surface from a random structure on a wing model. Deformations are simulated by small rotations of the wing in the wind tunnel. In a second experiment the position of an aircraft model with and without wind load and the deformation of the flaps were measured. The first experiment revealed that the results of the two measuring systems were consistent with an accuracy of about 20µm on a measuring area of 200 x 300 mm measuring deformations ranging from 0 mm to 1.7 mm. In the second experiment, a deformation of about 3.8 mm within the flaps was detected for changing wind load resulting form a change of the attack angle in the range of –10 degree to 10 degree (flaps angle 4 degree). With no wind load, the measured deformation was below 0.4 mm. As a result, the combination of the two measuring systems yields a ready to use system for the pure optical detection of the position, orientation and deformation of models in a wind tunnel with arbitrary movements or accelerations.

Document Type:Conference or Workshop Item (Speech, Paper)
Additional Information: LIDO-Berichtsjahr=2004, monograph_id=234,
Title:ACCURACY OF COMBINED 3D SURFACE DEFORMATION MESUREMENT AND 3D POSITION TRACKING IN A WIND TUNNEL
Authors:
AuthorsInstitution or Email of Authors
Michaelis , DirkLaVision, Göttingen, Germany
Frahnert, HolgerUNSPECIFIED
Stasicki, BoleslawUNSPECIFIED
Date:2004
Page Range:pp. 1-8
Series Name:CD-ROM Proceedings
ISBN:88 386 6273 - 8
Status:Published
Keywords:Position detection, deformation analysis, surface shape, optical, non-intrusive, low speed, high speed, flap angle, flap deformation
Event Title:ICEM12- 12th International Conference on Experimental Mechanics
Event Location:Politecnico di Bari, Italy
Event Type:international Conference
Event Dates:29 August - 2 September 2004
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: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Experimental Methods
Deposited By: Ilka Micknaus
Deposited On:31 Jan 2006
Last Modified:09 Feb 2010 10:19

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