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Adaptive control has been increasingly used in flight control of late, with notable technology transitions to autonomous flight platforms such as Joint Direct Attack Munition (JDAM), X–36 Tailless Fighter Agility Research Aircraft, NASA Generic Transport Model (GTM), and Boeing Phantom Ray. Given the need to make these flight systems autonomous, the spotlight, more than ever, is firmly on adaptive...
This paper proposes an adaptive controller for a hypersonic cruise vehicle subject to aerodynamic uncertainties, center-of-gravity movements, actuator saturation, failures, and time-delays. The adaptive control architecture is based on a linearized model of the underlying rigid body dynamics and explicitly accommodates for all uncertainties. It also includes a baseline proportional integral filter...
Fretting experiments were conducted on the (100) crystal (cubic) face of a single crystal Ni-base superalloy in two directions, 〈100〉 and 〈110〉, to study the effect of crystallographic orientation on the fretting response in both partial slip and gross slip regimes. The study involved point contacts using a tungsten carbide (WC) ball with radius 10mm tested at room temperature. Ball indentation was...
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