筒仓动态卸料过程侧压力模拟与验证

发布时间：2018-05-04 22:38

本文选题：筒仓 + 模型　；参考：《农业工程学报》2017年05期

【摘要】：为了研究立筒仓卸料过程中的侧压力及数值模拟技术,设计了有机玻璃筒仓模型进行试验研究,运用ABAQUS有限元软件中的自适应网格划分技术模拟了筒仓的动态卸料过程。结果表明,筒仓动态侧压力试验值大于静态侧压力,但各测点超压系数不同,在邻近漏斗附近超压系数最大为1.78,其次为仓壁中上部2个测点超压系数达到了1.73和1.61,其他位置超压系数在1.45以内;侧压力模拟值与计算值吻合度较好,静态侧压力两者相对误差绝对值在0.43%~9.92%之间,动态侧压力两者相对误差绝对值在1.14%~9.65%之间,验证了数值模拟技术的可行性;静态和动态侧压力的数值模拟曲线、公式计算曲线、试验曲线或试验拟合曲线都表明,随着测点距筒仓底部高度的增加,侧压力呈下降趋势,即侧压力下大上小,而且静态侧压力模拟曲线与试验曲线变化规律一致,相对误差绝对值在1.83%~9.97%之间;由于试验时压力传感器精度、标定试验误差和试验次数等随机因素的影响,动态侧压力试验曲线不很规则,数值模拟曲线相对平滑,但动态侧压力试验值的拟合曲线与数值模拟曲线变化趋势基本相同,相对误差绝对值在0.28%~9.93%之间。通过观察漏斗附近Mises应力分布图发现,物料卸出前,应力较大点发生在紧邻漏斗附近的仓壁处,卸料开始后,应力较大点即转向漏斗壁中部某范围,而且随着卸料时间的延长,此应力较大点的范围有所增大。
[Abstract]:In order to study the lateral pressure and numerical simulation technology in the unloading process of vertical silo, a model of organic glass silo was designed and tested. The dynamic unloading process of silo was simulated by using adaptive mesh generation technique in ABAQUS finite element software. The results show that the dynamic lateral pressure test value of silo is larger than that of static lateral pressure, but the overpressure coefficient of each measuring point is different. In the vicinity of the funnel, the maximum overpressure coefficient is 1.78, the overpressure coefficient of the two measuring points in the middle and upper part of the silo wall is 1.73 and 1.61, the overpressure coefficient of other positions is less than 1.45, and the simulation value of lateral pressure is in good agreement with the calculated value. The absolute value of relative error of static lateral pressure and dynamic lateral pressure is between 0.43% and 9.92%, and the absolute value of relative error between static and dynamic lateral pressure is between 1.14% and 9.65%, which verifies the feasibility of numerical simulation technology. Both the test curve and the test fitting curve show that with the increase of the height from the measuring point to the bottom of the silo, the lateral pressure tends to decrease, that is, the lateral pressure is large and small, and the static lateral pressure simulation curve is consistent with the experimental curve. The absolute value of relative error is between 1.83% and 9.97%. Due to the influence of random factors such as the accuracy of pressure sensor, calibration error and test times, the dynamic lateral pressure test curve is not very regular, and the numerical simulation curve is relatively smooth. But the fitting curve of dynamic lateral pressure test is basically the same as that of numerical simulation, and the absolute value of relative error is between 0.28% and 9.93%. By observing the distribution of Mises stress near the funnel, it is found that before the material is unloaded, the larger stress occurs near the silo wall near the funnel. After discharging, the larger stress point turns to a certain area in the middle of the funnel wall, and with the prolongation of discharging time, the larger stress point changes to a certain area in the middle of the funnel wall. The range of the larger stress points is increased.
【作者单位】：郑州航空工业管理学院土木建筑工程学院;河南工业大学土木建筑学院;郑州大学综合设计研究院有限公司;
【基金】：国家自然科学基金资助项目“基于环境激励的钢筋混凝土立筒群仓动力相互作用机理研究”(51178164) 郑州市科技计划项目“立筒仓的动力测试优化与动力特性研究”(20140586)
【分类号】：TU317

【相似文献】