Journal
ADVANCED ROBOTICS
Volume 34, Issue 11, Pages 700-714Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/01691864.2020.1769723
Keywords
Flying-hose-type robot; long-form body; Torsion torque; multiple water-jet nozzles; firefighting
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Several ground-based robots have been developed to support dangerous fire extinguishing activities; however, in such cases, it is difficult to access the fire sources directly. The concept of a hose-type robot called 'dragon firefighter' (DFF) is proposed herein; it emits high-pressure water from a fire hose and floats it for direct transmission to the fire point. A stable levitation with 2 m length was realized; however, for practical use, we must extend the floating length of the robot. This study was aimed at extending the floating length of a hose-like body. Two primary issues need to be addressed for achieving this aim: lack of a sufficient reaction force for flying and torsion along the longitudinal direction of the body. Therefore, our robot was first extended using a middle nozzle. A flow channel model was constructed, and an injection hole was designed to achieve a cross-sectional area that could generate a sufficient reaction force. An adjustable jet direction nozzle was designed with four degrees of freedom to control the net force and torsion torque. Finally, a simple proportional-derivative control was incorporated to adjust the twist angle, float the DFF (3.6 m length), surmount a wall, and subsequently, extinguish the fire.
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