Active Control of Aerial Refueling Drogue PDF
By:Taeseung Kuk
Published on 2014 by
An active stabilization method for an aerial refueling drogue used in probe drogue refueling system is presented in this study. The present refueling drogue exhibits an unstable motion due to various turbulent natures, which results in high failure rates and sometimes catastrophic accidents. Although it is considered a routine procedure for human pilot, the workload for mid-air refueling is highly demanding and autonomous operation is by no means a simple task. With rapidly growing use of unmanned aerial vehicles, autonomous aerial refueling is identified as one of essential technologies in future aviation. The present research is a pioneering work in active drogue stabilization that includes conceptual design of a controllable drogue, comprehensive dynamic wind tunnel experiments including a scale model prototype manufacturing, mathematical modeling and feedback control, and hardware-in-the-loop simulation. A set of four aerodynamic control surfaces is implemented to minimize the level of modification necessary for the current hose-drogue refueling system. An inertial measurement unit is adopted as a primary sensor to detect the drogue motion. To verify the system performance, a four degrees of freedom dynamic test rig system is fabricated for wind tunnel experiment. This system is composed of a rigid link and the controllable drogue, and a representative mathematical model is constructed based on the multi-body dynamic analysis with experimentally measured data. A feedback control law is implemented to a custom designed avionics hardware. An artificial gust generator is fabricated to create turbulent flow field in the wind tunnel, and is quantified by a five hole probe system. The results from the closed-loop, hardware-in-the-loop simulation test indicates that the proposed concept reduces the drogue motion up to 90 percent.
This Book was ranked at 15 by Google Books for keyword Drogue.
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