Aircraft freeplay analyses are presented for an aeroelastic stability envelope representative of jet aircraft. An aileron, elevator, rudder, and store are modeled to have a rotational freeplay in their attachments. The analyses are performed with varying amount of aerodynamic preload, permitting to assess its effect on response and determine oscillation-quenching preloads. Vibration environment in the aircraft cabin is compared with human comfort and fatigue vibration levels. It is shown that the vibrations due to 0.13 deg control surface and store freeplay do not have significant effect on the comfort in the cabin, whereas 0.40 deg freeplay-induced vibrations affect the pilot’s proficiency. Flutter analyses are provided to help explain the nonlinear response. The correlation between flutter and nonlinear response previously discussed in detail on a typical wing example is reemphasized. In addition, strain energy results from normal modes analyses are employed to identify the modes contributing the most to the nonlinear behavior.
Aircraft Control Surface and Store Freeplay-Induced Vibrations in Aeroelastic Stability Envelope
Journal of Aircraft ; 53 , 5 ; 1538-1548
01.09.2016
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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