Determination of the Deformed Structural Shape of HIADs from Photogrammetric Wind Tunnel Data

Kazemba, Cole; Tran, Kevin; Quach, Bill; Kushner, Laura K.; Cassell, Alan M.; Li, Lin; Braun, Robert D.; Littell, Justin D.; Norman, John Van; Johnson, R. Keith; Hughes, Stephen J.; Calomino, Anthony M.; Cheatwood, F. McNeil

doi:10.2514/6.2013-1286

Cited by 12 publications

(11 citation statements)

References 4 publications

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“…Given that the HIAD is a blunt body it was hypothesized that oscillations would result from vortex shedding, estimated to be 2-3 Hz. 35 Thus the frequency of oscillation was investigated in order to determine if low frequency content could be detected with this experimental set-up and if it could be correlated to vortex shedding or another known source.…”

Section: E Oscillation Frequency To Predict External Forcingmentioning

confidence: 99%

“…Other analyses observed qualitative hysteresis effects from rotating the HIAD through a range of yaw angles. 35 Since this data was collected over the entire test program, these effects could potentially mask differences between the baseline and tri-torus configurations. For a better understanding of the Baseline and Tri-torus performance, error bars can be included to understand the certainty of the results.…”

Section: B Deflection Angle Measurementsmentioning

confidence: 99%

“…Other analyses try to account for this phenomenon by performing a line fit of all points along a given radial direction. 35 An overall comparison was performed that looked at the deflection of the Baseline and Tri-torus configurations over all available data sets. In this way, average performance of both configurations could be assessed.…”

Section: B Deflection Angle Measurementsmentioning

confidence: 99%

See 2 more Smart Citations

Photogrammetry Analysis of a Hypersonic Inflatable Aerodynamic Decelerator Structural Test Article

Lin

Braun

Cassell

2014

55th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference

Self Cite

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Analysis was performed on photogrammetry data of a 6m Hypersonic Inflatable Aerodynamic Decelerator (HIAD), an inflatable stacked torus used to aid in atmospheric entry, to understand its structural dynamics. Photogrammetry data was obtained during wind tunnel testing under various loading conditions. Test parameters included the freestream dynamic pressure, yaw angle and internal inflation pressure. In addition, two HIAD configurations were analyzed, the basic stacked torus (Baseline configuration) and a second configuration adding a torus near the shoulder to aid in rigidity (Tri-torus configuration). The analysis includes estimating the deflection of the HIAD under loading as well as calculating the standard deviation relative to the mean deflection and the frequency content of the dynamic response. Under load, the deflection angle for each configuration ranged from 1° to 3° (1σ). The photogrammetry data showed that the oscillatory motion increased with higher dynamic pressure but was insensitive to yaw angle. In addition, the analysis showed that the standard deviation of the HIAD shape with respect to the average deflection increased while moving radially outwards. However, the standard deviation values calculated from different camera pairs were inconsistent as a result of their distances to the test article. The frequency analysis showed that each radial member behaved similarly to a rigid oscillator, having the same frequency content of motion along each radial direction and increased amplitude when moving radially outward. Both the frequency and shape standard deviation analyses showed that the motion of the HIAD was piecewise continuous in the azimuthal direction. These discontinuities are also likely due to the location of different camera pairs. The photogrammetry data is a valuable dataset providing insight into the static and dynamic response of the HIAD under loading. However, inconsistencies in the camera resolution need to be accounted for and higher temporal resolution will improve the fidelity of analysis.

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Section: E Oscillation Frequency To Predict External Forcingmentioning

confidence: 99%

Section: B Deflection Angle Measurementsmentioning

confidence: 99%

Section: B Deflection Angle Measurementsmentioning

confidence: 99%

See 1 more Smart Citation

Photogrammetry Analysis of a Hypersonic Inflatable Aerodynamic Decelerator Structural Test Article

Lin

Braun

Cassell

2014

55th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference

Self Cite

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“…Research to determine the response of IAD to dynamic pressure has also been done. The sensitivity to inflation pressure was also ost optimum inflation pressure [51].…”

Section: N a Dollah Et Almentioning

confidence: 99%

“…Research to determine the response of IAD to dynamic pressure has also been done. The sensitivity to inflation pressure was also determined to ensure the system can operate at the most optimum inflation pressure [51] on the surface of the wing. High resolution camera will take multiple digital images of the wing during the test and the image will be combined and process to generate a 3D…”

Section: N a Dollah Et Almentioning

confidence: 99%

Inflatable structure for aerospace application: Historical perspective and future outlook

Dollah

Saad

CheIdris

2018

J. Fundam and Appl Sci.

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This is an overview topic of inflatable structure for aerospace application. An inflatable structure is a promising choice for a wide r application are inflatable wing, space antenna, solar array, inflatable aeroshell and inflatable aerodynamic decelerators. The advantages of inflatable structure are it offers the potential for compact stowing of lightweight structure. This will efficient packaging, easy to deploy and ultimately lead to reduction in mission cost.Historically, inflatable technology has been introduced as a concept in aerospace application with a patent on flying glider th Over the years, many concepts of inflatable were introduced but only a small number of concepts have progress beyond the stage of design and even fewer manage to be completed and used extensively.

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Feedback shape control for deployable mesh reflectors using gain scheduling method

Xie

Shi²,

Alleyne

et al. 2016

Acta Astronautica

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Determination of the Deformed Structural Shape of HIADs from Photogrammetric Wind Tunnel Data

Cited by 12 publications

References 4 publications

Photogrammetry Analysis of a Hypersonic Inflatable Aerodynamic Decelerator Structural Test Article

Photogrammetry Analysis of a Hypersonic Inflatable Aerodynamic Decelerator Structural Test Article

Inflatable structure for aerospace application: Historical perspective and future outlook

Feedback shape control for deployable mesh reflectors using gain scheduling method

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