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Image-based force and moment measurement in hypersonic facilities

Laurence, Stuart J. and Hornung, H. G. (2009) Image-based force and moment measurement in hypersonic facilities. Experiments in Fluids, 46 (2). ISSN 0723-4864. https://resolver.caltech.edu/CaltechAUTHORS:20090810-113411633

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Abstract

This article addresses the problem of force and moment measurement in short-duration hypersonic facilities. An image-based technique is described in which the motion of a free-flying model is tracked over a sequence of high-speed digital images. Force components are derived from the calculated trajectory by assuming constant acceleration during the test time. A linear version of the technique, appropriate for simple model geometries, is first outlined and the technique’s precision is estimated. A nonlinear version, suitable for more generalised body shapes, is then described in the context of a series of experiments to determine the aerodynamic characteristics of the NASA Orion vehicle in the T5 hypervelocity shock tunnel. The accuracy of these measurements was adversely affected by both the choice of light source and test-gas luminosity, but these experiments nevertheless show image-based measurements to be, at the very least, a promising supplement to standard accelerometer-based techniques.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1007/s00348-008-0565-6DOIUNSPECIFIED
http://www.springerlink.com/content/356474m3u57w263n/PublisherUNSPECIFIED
ORCID:
AuthorORCID
Hornung, H. G.0000-0002-4903-8419
Additional Information:© 2008 Springer. Received: 15 May 2008 Revised: 12 August 2008 Accepted: 28 August 2008 Published online: 16 September 2008. The authors wish to express their gratitude to Prof. J. Shepherd for a generous loan of equipment that made the linear image-tracking experiments possible. Funding for the Orion experiments was provided through Contract NNA06B17P from NASA Ames RC.
Group:GALCIT
Funders:
Funding AgencyGrant Number
NASANNA06B17P
Issue or Number:2
Record Number:CaltechAUTHORS:20090810-113411633
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20090810-113411633
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:14923
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:10 Aug 2009 23:44
Last Modified:22 Nov 2019 09:58

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