The influence of baffle position on liquid sloshing during the braking and turning of a tank truck was studied using a volume of fluid (VOF) model. The forces,their positions and weight distribution during braking and...The influence of baffle position on liquid sloshing during the braking and turning of a tank truck was studied using a volume of fluid (VOF) model. The forces,their positions and weight distribution during braking and the forces and rolling moment during turning were calculated. The reliability of the calculation method was validated by comparisons with experimental results. The results showed that during braking,liquid splashes in the tank and the maximum forces and G (the ratio of weight acting on the front axle to the rear axle) are large when A (the ratio of the arch area above the baffle to the area of cross section)≤0.1. When A≥0.2,as the position of the baffle is lowered,the maximum of Fx (the force in direction x) first decreases then increases,and the maximum of Fy (the force in direction y) and G increase. During turning,liquid splashes in the tank and the maximum forces and M (the rolling moment) are large when D (the ratio of the arch area above the baffle to the area of cross section)≤0.2. When D≥0.3,as the position of the baffle is lowered,the maximums of Fy,Fz (the force in direction z) and M increase.展开更多
针对通过焊接工艺组装而成的铁路罐车在运行中经常发生断裂的问题,利用Isight平台,根据美国AAR标准提供的载荷谱,依据国际焊接协会International Institute of Welding标准,基于准静态法和Miner累计损伤理论选取了9个危险焊缝进行疲劳...针对通过焊接工艺组装而成的铁路罐车在运行中经常发生断裂的问题,利用Isight平台,根据美国AAR标准提供的载荷谱,依据国际焊接协会International Institute of Welding标准,基于准静态法和Miner累计损伤理论选取了9个危险焊缝进行疲劳寿命评估。通过将焊接疲劳计算的相关文件集成到Isight平台,进行了流程化虚拟疲劳计算。计算结果显示,所选的9个焊缝均符合设计要求。该方法显著缩短了疲劳寿命计算时间,并提高了计算结果的可靠性。展开更多
文摘The influence of baffle position on liquid sloshing during the braking and turning of a tank truck was studied using a volume of fluid (VOF) model. The forces,their positions and weight distribution during braking and the forces and rolling moment during turning were calculated. The reliability of the calculation method was validated by comparisons with experimental results. The results showed that during braking,liquid splashes in the tank and the maximum forces and G (the ratio of weight acting on the front axle to the rear axle) are large when A (the ratio of the arch area above the baffle to the area of cross section)≤0.1. When A≥0.2,as the position of the baffle is lowered,the maximum of Fx (the force in direction x) first decreases then increases,and the maximum of Fy (the force in direction y) and G increase. During turning,liquid splashes in the tank and the maximum forces and M (the rolling moment) are large when D (the ratio of the arch area above the baffle to the area of cross section)≤0.2. When D≥0.3,as the position of the baffle is lowered,the maximums of Fy,Fz (the force in direction z) and M increase.
文摘针对通过焊接工艺组装而成的铁路罐车在运行中经常发生断裂的问题,利用Isight平台,根据美国AAR标准提供的载荷谱,依据国际焊接协会International Institute of Welding标准,基于准静态法和Miner累计损伤理论选取了9个危险焊缝进行疲劳寿命评估。通过将焊接疲劳计算的相关文件集成到Isight平台,进行了流程化虚拟疲劳计算。计算结果显示,所选的9个焊缝均符合设计要求。该方法显著缩短了疲劳寿命计算时间,并提高了计算结果的可靠性。
