Dynamic modeling of cable towed body using nodal position finite element method |
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| Authors: | FJ Sun M LaRosa |
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| Institution: | a Department of Earth and Space Science and Engineering, York University, 4700 Keele Street, Toronto, Ontario, Canada M3J 1P3
b Curtiss-Wright Flow Control Company, Indal Technologies, 3570 Hawkestone Road, Mississauga, Ontario, Canada L5C 2V8 |
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| Abstract: | This paper analyses nonlinear dynamics of cable towed body system. The cable has been modeled and analyzed using a new nodal position finite element method, which calculates the position of the cable directly instead of the displacement by the existing finite element method. The newly derived nodal position finite element method eliminates the need of decoupling the rigid body motion from the total motion, where numerical errors arise in the existing nonlinear finite element method, and the limitation of small rotation in each time step in the existing nonlinear finite element method. The towed body is modeled as a rigid body with six degrees of freedom while the tow ship motion is treated as a moving boundary to the system. A special procedure has been developed to couple the cable element with the towed body. The current approach can be used as design tool for achieving improved directional stability, maneuverability, safety and control characteristics with the cable towed body. The analysis results show the elegance and robustness of the proposed approach by comparing with the sea trial data. |
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| Keywords: | Nodal position finite element method Dynamics Cable Towed body Modeling |
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