Abstract: A dynamics model for the navigating pose of amphibious vehicle in water is established. The dynamic mesh technology and the hybrid coupled algorithm are used to study the change rule of navigating pose of amphibious vehicle in sailing, and the navigating pose of amphibious vehicles in still water are discussed. The numerical results are consistent with the experimental results. The result shows that the vehicle undergoes a sharp motion and a smooth motion during movement before achieving the ultimate navigating pose. After achieving the ultimate navigating pose, the center-of-gravity and the pitch angle slightly change. During the process of sailing from drainage state to coasting state, the body center of gravity gradually increases; the dynamic buoyancy to support the vehicle weight increases, and the static buoyancy decreases.

Key words: ordnance science and technology, amphibious vehicle, navigating pose, dynamic mesh technology, numerical simulation