Stall warning using flap hinge moment measurements

Phillip J. Ansell, Michael B. Bragg, Michael F. Kerho

Research output: Contribution to journalArticlepeer-review


The development of a detection algorithm using the unsteady hinge moment from a simple flap on an airfoil with and without contaminants is studied. To obtain hinge moment data to be used in the detection algorithm development, a series of wind-tunnel tests were performed on a flapped NACA 3415 model. Hinge moment measurements were acquired at a sample rate of 3 kHz for 10 s. Before applying the hinge moment data to the stall detection algorithm, the hinge moment measurements were digitally low-pass filtered at 50 Hz to minimize the influence of structural frequencies. The unsteady hinge moment data obtained from the NACA 3415 test were operated on to increase the signal-to-noise ratio to provide more reliable estimates of the stall angle of attack. While boundary warning predictions were not generated for threshold boundaries other than 2°, there appears to be sufficient signal from the outputs of the detector functions to set the threshold boundary 1 to 4° before stall.

Original languageEnglish (US)
Pages (from-to)1822-1824
Number of pages3
JournalJournal of Aircraft
Issue number5
StatePublished - 2011

ASJC Scopus subject areas

  • Aerospace Engineering


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