Analysis And Research Of Fluid-solid Coupling Of Tank Truck And Lateral Stability Of Vehicle

With the transportation industry flourishing, highway network construction has increasingly been completed. Production and transport of tank truck and other heavy vehicles delivering dangerous goods has undergone tremendous progress with its high efficiency of transportation and the best overall advantages. So it has played the most important role in the road transport industry. Meanwhile road transport accidents occur frequently.Especially the serious accident of the tank truck and other heavy vehicles such as instability phenomena、sideslip and roll and they still maintain an upward trend. Tanker turning at high speed or suddenly encountered an emergency situation, the forced liquids’ sloshing in tank will have a strong coupling effect on the tank body which produce a powerful lateral impact and due to liquid sloshing its centroid offsets also seriously affected tanker lateral stability. In recent years, the lateral stability evaluation of tankers and other dangerous goods transport vehicles, lateral stability of the active intervention and establishing rollover active control strategy were widely studied. By analyzing the lateral stability of the tanker and the establishment of active control system that can effectively improve the lateral stability of the tanker, avoid skidding, rollover in time and dangerous traveling conditions and improve safety.In this dissertation dynamics of liquid sloshing inside the tank, tanker lateral stability and active control systems research were focused including the following aspects:First the dynamics of tank and fluid in the tank were analyzed. The forced liquid sloshing in the case of the tank is not full filled(half filled or partially filled) might make a slight vibration or rotation sloshing around the central axis of the tank and even cause other strong nonlinear phenomena such as relocate or splash. Therefore liquid sloshing problems and dynamics in the tank of the above case were investigated respectively. Then derived kinetic equations of forced sloshing and expression of force and torque tank body suffered were obtained.Second using Fluent the three-dimensional solid model was made to fluid-solid coupling simulate of lateral sloshing of liquid inside the tank under the condition of highspeed turning and analysis of the influence of the way anti-wave plate arranged, the form of its height, filling ratio, lateral acceleration and liquid centroid offset. The results show that arranging two high(more than 1m) longitudinal anti-wave plate and 0.8 filling ratio of tank can reduce the impact of liquid sloshing and prevent centroid offset of liquid so that the liquid can be maintained in the vicinity of the centroid position of the axis of the tanker as possible as it can.Third using Trucksim road tanker vehicles were modeled under the high-speed steering condition of the tank liquid sloshing, combining liquid instantaneous centroid offset data processing, which can be reasonable for simulation analysis of lateral stability and rollover characteristics of tank truck. The results show that arranging two more than 1m height’s longitudinal anti-wave plate and 0.8 filling ratio of tank can minimize the change of yaw rate and roll angle of the tank truck, obtain high lateral stability and decrease roll tendency.Finally, using Trucksim and Simulink the active control strategy of stability of the tanker traveling at high speed steering was established. Tanker wheels’ vertical load transfer rate and the spring compression ratio were obtained then the spring force of the two sides to achieve active control of lateral stability is changed and the traditional antirollover control trigger method is improved. The high speed turning anti rollover active control system of tank truck is simulated and its yaw and roll characteristics were obtained comparing with the same case with no anti-rollover control strategy. The results show that in simulation yaw instability and rollover phenomenon did not appear under the active control and the tank truck remains relatively stable all time when traveling which achieved the purpose of the anti-rollover stability control.