重型罐车内液体晃动参数化数学模型辨识

Parameter identification of equivalent mechanical model of liquid sloshing in tank truck

液罐车在转向或制动过程中贮箱内的液体晃动会给车辆操纵稳定性及行驶安全性带来极大的隐患.针对此类现象,对贮箱内液体建立不含阻尼项的等效单摆模型,基于此模型推导出作用在贮箱体上带有参数的力和力矩的表达式;利用数值仿真软件对计算结果进行数据拟合,得到等效模型参数的等效值,使等效力学模型实现了参数化.通过不同工况下利用CFD仿真软件进行的大量数值仿真分析,表明CFD仿真软件与使用本文辨识方法得到的晃动力与晃动力矩结果对比吻合度较高,从而说明了使用本文所提出的方法获得的等效力学模型具有较高的准确度.

Great hidden danger to the handling stability and driving safety is caused by liquid sloshing in the tank caused by steering or braking process of the tanker.Aiming at this,a equivalent simple pendulum model for the liquid in the tank,without damping terms,is established.Based on the equivalent simple model,the expressions of sloshing force and sloshing torque on the tank with parameters are derived.The numerical simulation software is used to match the calculated results.The values of the equivalent model parameters are obtained,by which the equivalent mechanical model is parameterized.Large number of simulation examples are calculated under different working conditions with CFD simulation software.The comparison of sloshing force and torque between the result of CFD simulation software and the results obtained by the identification method presented in this paper shows the equivalent mechanical model obtained by using the method proposed has high accuracy.