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为更好描述重物落水后的运动过程,设计了模拟封堵溃口小型试验,首先对重物落水后运动过程的影响因素进行分析,对采集的试验数据进行了分类处理,并对典型的试验数据进行比较分析,突出主要影响因素.其次对水中的重物进行了受力分析,以大实心方体为例,初步建立重物在水中运动过程的二阶微分方程模型(模型1),结合步长搜索法和最小二乘法确定压差阻力系数的初始范围,然后在Matlab平台下做非线性最小二乘拟合求解运动模型中压差阻力系数kx、ky;在模型1的基础上引入速度后损率kv,完善了重物在水中运动过程的二阶微分方程模型(模型2),并对模型中2的参数进行求解.模型结果验证显示,引入速度后损率后的模型2能比较好地反映重物落水后的运动过程,并对以后的研究提供了参考.
In order to better describe the movement process of heavy objects after falling into water, a small-scale simulation test of sealing and breaching holes was designed. The influencing factors of the movement process of heavy objects after falling into water were analyzed. The collected experimental data were classified and treated. Data are compared and analyzed, and the main influencing factors are highlighted.Secondly, the force analysis of heavy objects in water is carried out. Taking the large solid square as an example, the second order differential equation model (Model 1) Step search method and the least squares method to determine the initial range of the drag coefficient of resistance, and then make a nonlinear least squares fitting in the Matlab platform to solve the drag coefficient kx, ky in the kinematic model; on the basis of the model 1, (Kv), which improves the second-order differential equation model (model 2) of heavy objects moving in water and solves the parameters of model 2. The model results show that the model 2 after the introduction of velocity and post-damage ratio can be compared Good reflection of heavy objects after falling into the water movement process, and provides a reference for future research.