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Dynamic Force Measurement in Hyperso...

Draper, John, III.

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Dynamic Force Measurement in Hypersonic Wind Tunnels.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Dynamic Force Measurement in Hypersonic Wind Tunnels./
Author:	Draper, John, III.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
Description:	237 p.
Notes:	Source: Dissertations Abstracts International, Volume: 81-04, Section: B.
Contained By:	Dissertations Abstracts International81-04B.
Subject:	Aerospace engineering. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13901352
ISBN:	9781687912879

Dynamic Force Measurement in Hypersonic Wind Tunnels.
Draper, John, III.

Dynamic Force Measurement in Hypersonic Wind Tunnels. - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 237 p.

Source: Dissertations Abstracts International, Volume: 81-04, Section: B.

Thesis (Ph.D.)--University of Maryland, College Park, 2019.

This item is not available from ProQuest Dissertations & Theses.

In this dissertation, dynamic force measurement methodologies are developed and implemented for use in hypersonic wind tunnel testing. The chief application is implementation into Arnold Engineering Development Complex's Hypervelocity Wind Tunnel No. 9. The Sum of Weighted Accelerations Technique, Time Domain Deconvolution Method, and Frequency Domain Inverse Method are of particular interest for this study due to their implementation feasibility within Tunnel 9.The formulation of each "conventional" method is presented in its most basic or commonly used form. Then several modifications are made to improve the results of the various methods. Much of this work focuses on the specific alterations performed on each method and the consequences of each change. To improve the Sum of Weighted Accelerations Technique, modal separation and a damping matrix are added to the formulation. This allows for higher frequency accuracy and successful reconstructions on highly damped setups. A novel Time Domain Deconvolution Method is formulated in this dissertation which exhibits several advantages over the typical time domain approaches. Examples include elimination of inversion regularization, smooth reconstructions, and improved computational efficiency via response segmentation. The Frequency Domain Inverse Method was reformulated to solve directly for the frequency response function. This direct solution also allows for the use of multiple calibration tests during solution which improves accuracy.Each alteration is validated on numerical, bench top, and wind tunnel systems to provide a full theory to implementation understanding. Linked spring-mass-damper models are used for all of the numerical investigations with additive Gaussian noise and are used to draw early conclusions about each method and alteration. Bench top studies are performed on three separate support structures to build confidence in the methods on a more complex, experimental system. Finally, data obtained by tests performed in a transonic wind tunnel are used to demonstrate the capabilities and highlight some of the advantages of each method.

ISBN: 9781687912879Subjects--Topical Terms:

1002622
Aerospace engineering.
Subjects--Index Terms:

Convolution

Dynamic Force Measurement in Hypersonic Wind Tunnels.
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020 $a 9781687912879
035 $a (MiAaPQ)AAI13901352
035 $a AAI13901352
040 $a MiAaPQ $c MiAaPQ
100 1 $a Draper, John, III. $3 3550689
245 1 0 $a Dynamic Force Measurement in Hypersonic Wind Tunnels.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2019
300 $a 237 p.
500 $a Source: Dissertations Abstracts International, Volume: 81-04, Section: B.
500 $a Advisor: Lee, Sung W.
502 $a Thesis (Ph.D.)--University of Maryland, College Park, 2019.
506 $a This item is not available from ProQuest Dissertations & Theses.
506 $a This item must not be sold to any third party vendors.
520 $a In this dissertation, dynamic force measurement methodologies are developed and implemented for use in hypersonic wind tunnel testing. The chief application is implementation into Arnold Engineering Development Complex's Hypervelocity Wind Tunnel No. 9. The Sum of Weighted Accelerations Technique, Time Domain Deconvolution Method, and Frequency Domain Inverse Method are of particular interest for this study due to their implementation feasibility within Tunnel 9.The formulation of each "conventional" method is presented in its most basic or commonly used form. Then several modifications are made to improve the results of the various methods. Much of this work focuses on the specific alterations performed on each method and the consequences of each change. To improve the Sum of Weighted Accelerations Technique, modal separation and a damping matrix are added to the formulation. This allows for higher frequency accuracy and successful reconstructions on highly damped setups. A novel Time Domain Deconvolution Method is formulated in this dissertation which exhibits several advantages over the typical time domain approaches. Examples include elimination of inversion regularization, smooth reconstructions, and improved computational efficiency via response segmentation. The Frequency Domain Inverse Method was reformulated to solve directly for the frequency response function. This direct solution also allows for the use of multiple calibration tests during solution which improves accuracy.Each alteration is validated on numerical, bench top, and wind tunnel systems to provide a full theory to implementation understanding. Linked spring-mass-damper models are used for all of the numerical investigations with additive Gaussian noise and are used to draw early conclusions about each method and alteration. Bench top studies are performed on three separate support structures to build confidence in the methods on a more complex, experimental system. Finally, data obtained by tests performed in a transonic wind tunnel are used to demonstrate the capabilities and highlight some of the advantages of each method.
590 $a School code: 0117.
650 4 $a Aerospace engineering. $3 1002622
650 4 $a Fluid mechanics. $3 528155
653 $a Convolution
653 $a Dynamic
653 $a Force
653 $a Hypersonic
653 $a Structures
690 $a 0538
690 $a 0204
710 2 $a University of Maryland, College Park. $b Aerospace Engineering. $3 1018393
773 0 $t Dissertations Abstracts International $g 81-04B.
790 $a 0117
791 $a Ph.D.
792 $a 2019
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13901352