Torque Reduction Effect to External Shape Modification of Open-Type Marine Radar

Open-type marine radars experience significant wind loads during operation as their blade-shaped antenna units rotate horizontally, potentially causing motor speed reduction or complete stoppage. This study proposes an aerodynamically optimized cross-sectional shape design to reduce torque loads and improve rotational stability without requiring higher-powered motors. A novel axisymmetric cross-sectional shape was developed, featuring different designs at opposing ends to balance drag reduction on the load side and drag increase on the propulsion side. A multi-objective optimization framework combining Multi-Objective Bayesian Optimization (MOBO) with Computational Fluid Dynamics (CFD) was constructed. Results demonstrated successful Pareto front advancement, with optimized shapes achieving up to 25.3 % reduction in peak torque compared to the base shape in 3D CFD validation. The optimal shape featured a blunt edge with steps on one end and a smooth wing-like trailing edge on the other. CFD result revealed reduced vortex regions and improved flow attachment, contributing to the torque reduction.