基于动网格的两栖车航行姿态数值模拟

Numerical Simulation of Navigating Pose for Amphibious Vehicle based on Dynamic-mesh Model

针对两栖车水上航行姿态,构建描述两栖车水上运动的动力学模型,采用混合耦合算法和动网格技术研究静水直航状态下,两栖车航行姿态的变化规律,模拟结果与实验值吻合较好。研究结果表明:车体达到稳定航行姿态会经历大幅振荡调整阶段和平稳运动阶段,车体平衡后,升沉和纵倾仍会有小幅变化;两栖车由排水航行状态逐步增速到滑行状态的过程中,车体重心逐渐升高,动升力在支撑车重成分中所占的比例越来越大,静浮力则越来越小。

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.