Dynamic Modeling and Motion Analysis of Unmanned Underwater Gliders with Mass Shifter Unit and Buoyancy Engine Kim, Donghee; Lee, Sang Seob; Choi, Hyeung Sik; Kim, Joon Young; Lee, Shinje; Lee, Yong Kuk;
Underwater gliders do not have any external propulsion systems that can generate and control their motion. Generally, underwater gliders would obtain a propulsive force through the lift force generated on the body by a fluid. Underwater gliders should be equipped with mechanisms that can induce heave and pitch motions. In this study, an inner movable and rotatable mass mechanism was proposed to generate the pitch and roll motions of an underwater glider. In addition, a buoyancy control unit was presented to adjust the displacement of the underwater glider. The buoyancy control unit could generate the heave motion of the underwater glider. In order to analyze the underwater dynamic behavior of this system, nonlinear 6-DOF dynamic equations that included mathematical models of the inner movable mass and buoyancy control unit were derived. Only kinematic characteristics such as the location of the inner movable mass and the piston position of the buoyancy control unit were considered because the velocities of these systems are very slow. The effectiveness of the proposed dynamic modeling was verified through sawtooth and spiraling motion simulations.
Underwater glider;Movable mass;Buoyancy control unit;
Development of Biomimetic Underwater Vehicle using Single Actuator, Journal of the Korean Society for Precision Engineering, 2016, 33, 7, 571
Bhatta, P., Leonard, N.E., 2008. Nonlinear Gliding Stability and Control for Vehicles with Hydrodynamic Forcing. Automatica, 44(5), 1240-1250.
Eriksen, C.C., Osse, T.J., Light, R.D., Wen, T., Lehman, T.W., Sabin, P.L., Ballard, J.W., Chiodi, A.M., 2001. Seaglider: A Long Range Autonomous Underwater Vehicle for Oceanographic Research. IEEE Journal of Oceanic Engineering, 26(4), 424-436.
Fiorelli, E., Leonard, N.E., Bhatta, P., Paley, D.A., Bachmayer, R., Fratantoni, D.M., 2006. Multi-AUV Control and Adaptive Sampling in Monterey Bay. IEEE Journal of Oceanic Engineering, 31(4), 935-948.
Fossen, T., 1994. Guidance and Control of Ocean Vehicles. Wiley.
Graver, J., Leonard, N.E., 2001. Underwater Glider Dynamics and Control. 12th International Symposium on Unmanned Untethered Submersible Technology, Durham, 1-14.
Jung, J.W., Jeong, J.H., Kim, I.G., Lee, S.K., 2014. Experimental Study on Hydrodynamic Coefficients of Autonomous Underwater Glider Using Vertical Planar Motion Mechanism Test. Journal of Ocean Engineering and Technology, 28(2), 119-125.
Leonard, N.E., Paley, D.A., Davis, R.E., Fratantoni, D.M., Lekien, F., Zhang, F., 2010. Coordinated Control of an Underwater Glider Fleet in an Adaptive Ocean Sampling Field Experiment in Monterey Bay. Journal of Field Robotics, 27(6), 718-740.
Myring, D.F., 1976. A Theoretical Study of Body Drag in Subcritical Axisymmetric Flow. Aeronautical Quarterly, 27(3), 186-194.
Prestero, T.J., 2001. Verification of a Six-Degree of Freedom Simulation Model for the REMUS Autonomous Underwater Vehicle. Master's Thesis, Massachusetts Institute of Technology/Woods Hole Oceanographic Institution.
Smith, R.N., Schwager, M., Smith, S.L., Jones, B.H., Rus, D., Sukhatme, G.S, 2011. Persistent Ocean Monitoring with Underwater Gliders: Adapting Sampling Resolution. Journal of Field Robotics, 28(5), 714-741.
Webb, D.C., Simonetti, P.J., Jones, C.P., 2001. SLOCUM, An Underwater Glider Propelled by Environmental Energy. IEEE Journal of Oceanic Engineering, 26(4), 447-452.
Zhang, S., Yu, J., Zhang, A., Zhang, F., 2013. Spiraling Motion of Underwater Gliders: Modeling, Analysis, and Experimental Results. Ocean Engineering, 60, 1-13.