NUMERICAL PREDICTION AND HULL FORM REFINEMENT FOR SEAKEEPING IMPROVEMENT OF A CATAMARAN TYPE UNMANNED SURFACE VEHICLE
DOI:
https://doi.org/10.11113/jm.v49.702Keywords:
Ansys AQWA, Asymmetry catamaran, DELFT 372 catamaran, Seakeeping XbowAbstract
The unmanned surface vehicle (USV) is specifically designed for targeted applications such as offshore environmental monitoring, hydrographic surveys and others. However, excessive motions in rough sea conditions can affect the accuracy of sensor data and may lead to potential equipment damage. Hence, this study aims to enhance the USV’s seakeeping performance by improving the hull form design. The DELFT 372 model with a length between perpendiculars (Lpp) of 3.0 m and a hull separation of 0.46 m, was initially selected, modelled and validated before conducting seakeeping simulations using Ansys AQWA at a Froude number of 0.6. The simulated heave and pitch RAOs were then compared to published experimental results under Sea State 1 conditions for validation purposes. At Fr = 0.6 and a wave amplitude of 0.0179 m, the simulated heave and pitch RAOs were found to be 2.93 m/m and 94.25 °/m, with deviations of 4.61% and 8.96%, respectively compared to the published experimental data. The study then proceeds by slicing the original hull along its longitudinal centerline and repositioning the halves to form an outside-flat (OF) configuration, further modifying the bow to an X-bow design while maintaining the hull separation distance. The DELFT 372 OF-Xbow variant was also developed with an increased hull breadth from 0.12 m to 0.20 m. Seakeeping simulations were conducted for both modified configurations under Sea State 2 conditions at Fr = 0.6, where the wave amplitude is 0.25 m. The resulting heave and pitch RAOs were 0.97 and 0.96 respectively for the OF-Xbow at λ/Lpp of 9.69, and 0.90 and 2.09 for the OF-Xbow with 0.20 m demihull breadth, respectively. These values were compared to the symmetric hull, which exhibited heave and pitch RAOs of 0.80 and 2.67 respectively. The results indicate significant improvements in pitch motion of 64.17% for the OF-Xbow and 21.72% for the OF-Xbow with b = 0.20 m, compared to the symmetric hull. However, heave motion increased by 20.42% and 11.91% % for OF-Xbow and OF-Xbow with b = 0.20 m respectively. This study demonstrates that hull modifications can effectively reduce pitch motion, although this comes at the cost of increased heave motion.
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