Design and Experimental Validation of an Adaptive Landing Gear for Safe Landing on Uneven Grounds of VTOL UAVs in the Context of Lightweight and Fast Adaptations
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One of the most fundamental problems of rotary-wing aircraft that can take off and land vertically is that they cannot land safely when the ground on which they will land is too sloped. In case they have to make their landing, they inevitably face the risk of rolling over. The main source of this problem is that these vehicles have fixed landing gear. In this study, an important solution proposal is presented by performing an adaptive passive landing gear design and control for a four-rotor UAV with low takeoff weight, within the framework of the principle of fast adaptation to the ground, low cost, and weight. The experimental studies’ results indicated the usefulness of the proposed landing gear. This adaptive landing gear, produced within the scope of this study, has a total mass of 170 g, and it got the UAV to safely land on both sloped surfaces with 15 degrees and randomly uneven surfaces.