NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Nonlinear Aeroelastic Analysis of the HIAD TPS Coupon in the NASA 8' High Temperature Tunnel: Theory and ExperimentThe purpose of this work is to develop a set of theoretical and experimental techniques to characterize the aeroelasticity of the thermal protection system (TPS) on the NASA Hypersonic Inflatable Aerodynamic Decelerator (HIAD). A square TPS coupon experiences trailing edge oscillatory behavior during experimental testing in the 8' High Temperature Tunnel (HTT), which may indicate the presence of aeroelastic flutter. Several theoretical aeroelastic models have been developed, each corresponding to a different experimental test configuration. Von Karman large deflection theory is used for the plate-like components of the TPS, along with piston theory for the aerodynamics. The constraints between the individual TPS layers and the presence of a unidirectional foundation at the back of the coupon are included by developing the necessary energy expressions and using the Rayleigh Ritz method to derive the nonlinear equations of motion. Free vibrations and limit cycle oscillations are computed and the frequencies and amplitudes are compared with accelerometer and photogrammetry data from the experiments.
Document ID
20140008726
Document Type
Technical Memorandum (TM)
Authors
Benjamin D. Goldman (Duke University Durham, North Carolina, United States)
Robert C. Scott (Langley Research Center Hampton, Virginia, United States)
Earl H. Dowell (Duke University Durham, North Carolina, United States)
Date Acquired
July 7, 2014
Publication Date
May 14, 2014
Subject Category
Aerodynamics
Report/Patent Number
NF1676L-18077
L-20356
Funding Number(s)
WBS: 432938.11.01.07.43.40.08
Distribution Limits
Public
Copyright
Public Use Permitted.

Available Downloads

NameType 20140008726.pdf STI