Optimization and Design of Walking Mechanism System for Amphibious Unmanned Platform

The influence of the walking mechanism on the resistance characteristics of a high-speed wheeled amphibious unmanned platform is studied and analyzed by considering its structure parameters and speed. Firstly, the walking mechanism system of the amphibious unmanned platform is optimally designed and its simulation model is established. Secondly, a realizable SST k-ω turbulence model and a CFD numerical model built by overset mesh technique are used to obtain a reliable numerical method. Then, the vehicle with retractable wheels is selected for simulation and the effect of wheel flip angle on the hydrodynamic performance is analyzed. Finally, the simulation result shows that: The numerical method has high accuracy and can better realize the simulation of vehicle motion and resistance prediction on water. The influence of the wheels on the water resistance is more significant. And the sinkage and trim value decrease gradually with wheel flipping, but when the hull was in the planing regime, the hull sink and rise increased with the wheel flipping.