烟雾干扰场的时域特性试验与分析

Test and analysis of the variations of smoke screen's disturbing performances with time

依据少量的抽样测试数据,运用Aitkin插值技术,可了解烟雾干扰场在任一时刻的空间分布及这种分布随时间的变化。提出了平均扩散系数、即时扩散系数概念及基于烟幕矩心的风移速率、沉降速率,并给出了相应的定量计算方法。

The disturbance capability of a smoke curtain changes continually in pace with time. But usually in engineering, several times to do actual measruement only can be selected getting corresponding data. So it seems not enough to evaluate the dynamic features of the disturbance field with such data. Because of this, Aitkin interpolation is adopted. According to these data, disturbance capability of smoke curtain at any time can be calculated, and dynamic features of the disturbance field are shown completely. Adopting Aitkin interpolation, shielding area of smoke curtain at any time can be calculated, and the diffusion coefficient of smoke is gotten. According to its pictrue, by means of adaptive window, smoke curtain's centroid coordinate can be worked out. So it is also possible to calculate the drift velocity followingup wind and fall speed with gravity of the smoke curtain by Aitkin interpolation.