附加质量变化率在航行体出水过程中的影响研究

航行体出水运动过程中,附加质量逐渐减小,在一些研究其出水运动的模型中,只考虑了随状态变化的附加质量值,而没有充分考虑附加质量的变化过程。本文通过建立航行体出水运动物理模型和对航行体出水过程的受力分析,构建了出水过程的动力学方程。为了更加准确模拟航行体出水情况,在进行理想流体作用力求解时,引入附加质量变化率研究附加质量在出水过程中的变化以及对出水过程的影响。通过对数学模型的仿真分析表明,在计算模型中考虑附加质量变化率能显著提高模型的计算精度。

Influence on rate of change of added mass for an underwater vehicle during its water exit process

During the water exit process of underwater vehicle,the added mass is gradually decreasing.It is only the added mass values in certain states that are considered in some water exit models,instead of its whole rate of change.In this paper,the water exit model of an underwater vehicle is built,and force analysis is given.The set of dynamic equations of water exit is established.To simulate the water exit more accurately,the rate of change of added mass is included,and its influence on the water exit process is studied in calculating the ideal fluid force.The simulation results show that,taking rate of change of added mass into consideration can improve the computational accuracy of the model.