Dynamic stability measurements from tunnel unsteadiness excited random response AIAA-78-831

Sundaramurthy, H and Jategoankar, RV and Balakrishna, S (1978) Dynamic stability measurements from tunnel unsteadiness excited random response AIAA-78-831. In: 10th Aerodynamic Testing Conference.

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Flow unsteadiness in transonic and supersonic tunnels often causes large scatter and when excessive, even impedes dynamic stability measurements by contechnique utilising the tunnel unsteadiness as primary excitation on flexure mounted models for dynamic stability measurements in a trisonic blow down tunnel is presented in this paper. A time series autoregressive modelling technique is used for deriving a digital spectrum of the unsteadiness excited model response and the system damping is evaluated from the half power bandwidth of the spectrum. A typical record length used for the spectral analysis is 1.5 seconds. The technique validated by comparisons with conventional free osicilation pitch damping measurements on two models at subsonic and transonic speeds, is well suited for configurations is short duration intermittent facilities.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Dynamic stability;supersonic tunnels
Subjects: AERONAUTICS > Aircraft Design, Testing & Performance
Depositing User: Mrs Manoranjitha M D
Date Deposited: 09 Mar 2006
Last Modified: 24 May 2010 04:10
URI: http://nal-ir.nal.res.in/id/eprint/1064

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