Abstract
Hybrid-driven technology, which can improve the sailing performance of underwater gliders (UGs), has been successfully used in ocean observation. However, a hybrid-driven UG (HUG) with an added tail propeller is still unable to achieve backward and turning motion with a body length radius, and the hydrodynamic pitch moment acting on the HUG that is mainly caused by the fixed-wing makes it difficult to achieve high-precision attitude control during fixed-depth navigation. To solve this problem, a two-degree-of-freedom bioinspired controllable wing mechanism (CWM) is proposed to improve the maneuverability and cruising ability of HUGs. The CWM can realize five motion modes: modifying the dihedral angle or anhedral angle, changing the frontal area of the wing, switching the wing from horizontal to be a vertical rudder, flapping the wing as propulsion, and rotating the wing as a vector propeller. First, the design process of the CWM is provided, and hydrodynamic forces in each motion mode of three CWMs with different trailing edge sweepback angles (TESA) and attitude angles are analyzed through computational fluid dynamics simulation. The relationship between hydrodynamics and the attitude angles or TESA of the CWM is analyzed. Then, experiments are conducted to measure the hydrodynamics of the CWM when it is in a flapping wing mode and rotating the wing as a vector propeller, respectively. The hydrodynamic forces obtained from the simulation are consistent with data measured by a force sensor, proving the credibility of the simulated hydrodynamics. Subsequently, by applying the results of the hydrodynamic force in this study, the flapping trajectory of the wingtip is planned using the cubic spline interpolation method. Furthermore, two underwater demo vehicles with a pair of CWMs are developed, and experiments are conducted in a water tank, further validating and demonstrating the feasibility of the proposed CWM.
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This work was supported by the National Key R&D Program of China (Grant No. 2016YFC0301101), the National Natural Science Foundation of China (Grant No. 51721003), the Natural Science Foundation of Tianjin City (Grant No. 18JCJQJC46400), and the Aoshan Talent Cultivation Program of QNLM (Grant Nos. 2017ASTCP-OS05 and 2017ASTCP-OE01).
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Sun, T., Wang, Y., Yang, S. et al. Design, hydrodynamic analysis, and testing of a bioinspired controllable wing mechanism with multi-locomotion modes for hybrid-driven underwater gliders. Sci. China Technol. Sci. 64, 2688–2708 (2021). https://doi.org/10.1007/s11431-021-1890-7
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DOI: https://doi.org/10.1007/s11431-021-1890-7