防浪板对排水型两栖车辆水动力学的影响研究

防浪板是影响两栖车辆整车水上性能重要部件之一，为了研究防浪板对排水型两栖车辆水动力学的影响，建立了排水型两栖车辆流体力学计算模型。针对防浪板的形状、大小以及与车体的相对位置变化进行整车航行动力学仿真，综合分析了防浪板对整车航行阻力、升力以及纵向俯仰力矩的影响，并与试验数据进行了对比。研究结果表明：在形状方面，分段平板式防浪板具有弧形与平板式各自优点，是较佳的工程结构；在宽度上，随着宽度增加，阻力和升力变化不大，纵向恢复力矩增加较多，超过一定宽度后阻力急剧增加；在与车体相对距离方面，随着距离的增加，航行阻力增加，升力下降，纵向恢复力矩增幅较大；在防浪板与车体底平面夹角上，随着角度的增加，整车阻力和升力变化不大，但纵向恢复力矩增加显著。

Research on Influence of Breakwater on Hydrodynamic Characterisitics of Displacement Amphibious Vehicles

Breakwater is one of important parts which affect the performance of amphibious vehicle on water. A hydrodynamics model of displacement amphibious vehicle is established to research the influence of breakwater on its hydrodynamics. The hydrodynamics performance of displacement amphibious vehicle is simulated in terms of different shapes and sizes of breakwaters and their positions relative to vehicle body. The effect of breakwater on navigation resistance, lift force and longitudinal pitching moment is analyzed. The research results show that segmented breakwater is better engineering structure in shape, which has the advantages of arc-shaped and flat-plate breakwaters; the increase in width has small influence on resistance and lift force, but the longitudinal pitching moment increases a lot; with the increase in distance between breakwater and vehicle body, the resistance increases, the lift force decreases, and the longitudinal pitching moment increases greatly; with the increase in angle between breakwater and underbody plane, the resistance and lift force have a little change, but the longitudinal pitching moment increases significantly.