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A21 - Dynamic Response and Controls of Airship for Cruising, Busan National University, Gust effects

To acquire the dynamic response and design the controller of the airship, the longitudinal motion of the airship, which is a nonlinear system, with respect to the vertical gust have been studied. The effects of the apparent mass and moment of the airship delay the dynamic response and the settling time, which are slower than those of conventional airplanes. This airship is designed to cruise at 500 ~ 1000m altitude. At that altitude, the atmospheric conditions are generally unstable due to wind gusts. In this paper, a vertical gust case has been studied since the apparent mass effects are dominant in this plane. In addition to the study of the dynamic response of the airship, a PID controller was designed. The control parameters were determined from the stability mode analysis. The control inputs are the thrust and the elevator deflection angle. When the gust is applied, the airship responses recover to initial states, but the converging speeds are very slow. So the main foci of the controls are to increase the converging speed and to minimize the thrust input for stable cruising.

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