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Proceedings Paper

Technique for transient thermal testing of thick structures
Author(s): Thomas J. Horn; W. Lance Richards; Leslie Gong
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Paper Abstract

A new open-loop heat flux control technique has been developed to conduct transient thermal testing of thick, thermally-conductive aerospace structures. This technique uses calibration of the radiant heater system power level as a function of heat flux, predicted aerodynamic heat flux, and the properties of an instrumented test article. An iterative process was used to generate open-loop heater power profile prior to each transient thermal test. Differences between the measured and predicted surface temperatures were used to refine the heater power level command profiles through the iterative process. This iteration process has reduced the effects of environmental and test system design factors, which are normally compensated for by closed-loop temperature control, to acceptable levels. The final revised heater power profiles resulted in measured temperature time histories which deviated less than 25 degree(s)F from the predicted surface temperatures.

Paper Details

Date Published: 11 December 1997
PDF: 19 pages
Proc. SPIE 3151, High Heat Flux and Synchrotron Radiation Beamlines, (11 December 1997); doi: 10.1117/12.294500
Show Author Affiliations
Thomas J. Horn, NASA Dryden Flight Research Ctr. (United States)
W. Lance Richards, NASA Dryden Flight Research Ctr. (United States)
Leslie Gong, NASA Dryden Flight Research Ctr. (United States)


Published in SPIE Proceedings Vol. 3151:
High Heat Flux and Synchrotron Radiation Beamlines
Albert T. Macrander; Ali M. Khounsary, Editor(s)

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