Photogrammetry Applied to Wind-Tunnel Testing

Liu, Tianshu; Cattafesta, Iii L. N.; Radeztsky, Ronald H.; Burner, A. W.

doi:10.2514/2.1079

Cited by 88 publications

(23 citation statements)

References 13 publications

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“…In [8], three optical methods for measuring model deformation were compared by Burner A W and Fleming G A and characteristics of different methods were achieved. Liu T and Cattafesta investigated the application of photogrammetry in wind tunnel test [9]. In [10], a kind of optical measurement device based on three line array CCDs-Optotrak system and the measurement technology by the system were investigated by SONG Jin for low speed wind tunnel.…”

Section: Introductionmentioning

confidence: 99%

Correction of model deformation effects for a supercritical wing in transonic wind tunnel

Liu

et al. 2017

Teh. vjesn.

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Original scientific paper This paper presents a method to correct test model deformation effects due to aerodynamic loads in transonic wind tunnel. Deformation for a supercritical wing test model was measured under variation of dynamic pressure in the European Transonic Wind tunnel (ETW) using the Stereo Pattern Tracking (SPT) system. Deformed model mesh was generated by the structure grids deformation technology developed in this paper, and numerical results of rigid and deformed models were achieved based on the RANS solver. Then, correction of model deformation was obtained by subtracting the computational longitudinal aerodynamic coefficients of original model from those of deformed one. Results indicated that a good correlation of experimental and numerical results of deformed model was achieved, validating the reliability of numerical method developed to simulate model deformation. It is also suggested that the method developed in this paper could be used to correct test model deformation for original wind tunnel data. Keywords: correlation; ETW; SPT; structure grids deformation; test model deformation Ispravak učinaka deformacije modela za superkritično krilo u transoničkom vjetrenom tuneluIzvorni znanstveni članak Ovaj rad predstavlja metodu kojom se ispravljaju učinci deformacije ispitnog modela zbog aerodinamičkih opterećenja u transoničkom vjetrenom tunelu. Deformacija za superkritični ispitni model krila mjerena je pod utjecajem dinamičkog tlaka u European Transonic Wind tunelu (ETW) pomoću Stereo Pattern Tracking (SPT) sustava (sustava za stereo praćenje uzoraka). Deformirana mreža modela stvorena je tehnologijom deformacije strukturnih rešetaka razvijenom u ovom radu, a numerički rezultati krutih i deformiranih modela postignuti su na osnovi RANS-a (Reynolds-averaged Navier-Stokes solver). Zatim je ispravljena deformacija modela dobivena oduzimanjem računalnih uzdužnih aerodinamičkih koeficijenata originalnog modela od onih deformiranog. Rezultati su pokazali da je postignuta dobra korelacija eksperimentalnih i numeričkih rezultata deformiranog modela, potvrđujući pouzdanost numeričke metode koja je razvijena kako bi se simulirala deformacija modela. Također se predlaže da se metoda razvijena u ovom radu može upotrijebiti za korekciju deformacije testnog modela za izvorne podatke vjetrenog tunela.

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Section: Introductionmentioning

confidence: 99%

Correction of model deformation effects for a supercritical wing in transonic wind tunnel

Liu

et al. 2017

Teh. vjesn.

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“…On the other hand, planes have the benefit of a constant surface normal orientation across the artifact, and are easier to manufacture and validate to subwavelength accuracy using interferometric techniques. Planes have been used to calibrate optical SMSs, [3][4][5] and the control points used by the bundle adjustment software typically consist of intersecting points in a checkerboard pattern, 0091-3286/2011/$25.00 C 2011 SPIE circle centers in an array of circles, or some other ordered set of points.…”

Section: Introductionmentioning

confidence: 99%

Automated detection of planes in 3-D point clouds using fast Hough transforms

Ogundana

Coggrave²,

Burguete

et al. 2011

Opt. Eng

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Calibration of 3-D optical sensors often involves the use of calibration artifacts consisting of geometric features, such as 2 or more planes or spheres of known separation. In order to reduce data processing time and minimize user input during calibration, the respective features of the calibration artifact need to be automatically detected and labeled from the measured point clouds. The Hough transform (HT), which is a well-known method for line detection based on foot-of-normal parameterization, has been extended to plane detection in 3-D space. However, the typically sparse intermediate 3-D Hough accumulator space leads to excessive memory storage requirements. A 3-D HT method based on voting in an optimized sparse 3-D matrix model and efficient peak detection in Hough space is described. An alternative 1-D HT is also investigated for rapid detection of nominally parallel planes. Examples of the performance of these methods using simulated and experimental shape data are presented. C 2011 Society of Photo-Optical Instrumentation Engineers (SPIE).

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“…Photogrammetry, first developed to examine topography 23 , is commonly used in architecture, archaeology, engineering and accident reconstruction. Some of the common uses in aerospace engineering include model and equipment positioning, parachute canopy measurements 25 , model deformation and rotor blade deformation and position measurements 26,27 .…”

Section: Photogrammetrymentioning

confidence: 99%

“…Photogrammetry is a measurement technique that uses photography in determining the two-dimensional or threedimensional coordinates of an object of interest 23 . For the three-dimensional coordinates of an object to be obtained, multiple photographs of an object are taken from different perspectives.…”

Section: Photogrammetrymentioning

confidence: 99%

Photogrammetric Measurements of an EH-60L Brownout Cloud

Wong¹,

Tanner²

2016

J Am Helicopter Soc

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There is a critical lack of quantitative data regarding the mechanism of brownout cloud formation. Recognizing this, tests were conducted during the Air Force Research Lab 3D-LZ Brownout Test at the US Army Yuma Proving Ground. Photogrammetry was utilized during two rounds of flight tests with an instrumented EH-60L Black Hawk to determine if this technique could quantitatively measure the formation and evolution of a brownout cloud. Specific areas of interest include the location, size, and average convective velocity of the cloud, along with the characteristics of any defined structures within it. Following the first flight test, photogrammetric data were validated through comparison with onboard vehicle data. Lessons learned from this test were applied to the development of an improved photogrammetry system. A second flight test, utilizing the improved system, demonstrated that obtaining quantitative measurements of the brownout cloud are possible. Results from these measurements are presented in the paper. Flow visualization with chalk dust seeding was also tested. It was observed that pickup forces of the brownout cloud appear to be very low. Overall, these tests demonstrate the viability of photogrammetry as a means for quantifying brownout cloud formation and evolution.

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Photogrammetry Applied to Wind-Tunnel Testing

Cited by 88 publications

References 13 publications

Correction of model deformation effects for a supercritical wing in transonic wind tunnel

Correction of model deformation effects for a supercritical wing in transonic wind tunnel

Automated detection of planes in 3-D point clouds using fast Hough transforms

Photogrammetric Measurements of an EH-60L Brownout Cloud

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