Simulation Research On Lateral Liquid Sloshing In Tank Vehicles

Tank vehicle is an important part of road transport vehicles, the loads of tankvehicles are mostly fluid. Since liquid has flow characteristics, tank vehicle would beeffected of the centrifugal force in the process of turning, liquid in tank body produceslateral impact for the tank wall under lateral impact. The produced lateral impact willlargely reduce the lateral stability of the vehicle, easily lead vehicle rollover accident.Therefore, studying the lateral impact effect of liquid in tank vehicles has importanttheoretical significance and application value to improve vehicle stability, reduce tankvehicle rollover accident. Therefore, this specific work is as follows:1. On the basis of market research, this article selects square, circular and fivekinds of elliptical tank as research objects. On the basis of the analysis of tank vehicleoperating characteristic, using fluid dynamics theory analyze the fluid dynamics ofliquid sloshing in the tank, which laid the theoretical basis for building liquid sloshingsimulation model.2. According to fluid dynamics theory, using fluid dynamics simulation softwareFLUENT establish the simulation model of liquid sloshing in the tank; UsingFLUENT for square, circular and different ellipticity of ellipse tank under differenttypes and intensity of lateral excitation conditions carry on simulation, which hasobtained the lateral impact effect of liquid sloshing in tank vehicles under differentfilling ratio.3. Using MATLAB software for simulation data is analyzed in time domain.Through the time domain analysis of liquid impact, found that the liquid impact of theimpact of the tanks as increased as the ratio of liquid, when the liquid ratio wasbetween0.7and0.8can achieve the maximum impact. When the liquid ratio isconstant, the impact of liquid will be increased with lateral excitation increasing.4. Using MATLAB software for simulation data is analyzed in frequency domain.The time-domain signal of liquid impact was converted to a frequency domain signalby fourier transform, through the frequency domain analysis of liquid impact,first-order impact frequency amplitude is much greater than the second one, and the first order of the impact of liquid tank is the dominant frequency. When the liquidratio of square tank was at around0.7, the amplitude of first order frequency of theliquid sloshing can achieve the maximum. When the liquid ratio of circular tank wasbetween0.6and0.7, the amplitude of first order frequency of the liquid sloshing canachieve the maximum. When the liquid ratio of elliptical tank was between0.5and0.6, the amplitude of first order frequency of the liquid sloshing can achieve themaximum. When the liquid ratio is constant, the amplitude of first order frequency ofthe liquid sloshing would be increased with lateral excitation increasing.5. Liquid sloshing in the tank is carried on modal analysis by ANSYS software,which can obtain mode shape of dominant frequency. Through the modal analysis canget the liquid sloshing natural frequency and mode shapes of the first eightmodal,found that filling ratio is the influence factors of natural frequency and modalshapes.