向下位移 meaning in Chinese

downward displacement

Valuable conclusion in engineering are drawn for practical design . the method of getting reasonable prestress degree for suspendoem which is restricted by intergral stability was discussed . optimizing programs are developed with the axis force and joint displacement of upper dome as object function respectively , the effective method of prestress degree for suspendoem which is
探讨了稳定约束的弦支穹顶钢索合理预应力度的优化方法,分别以网壳杆件内力、节点竖向位移和节点垂直向下位移为目标函数编制了优化程序,得到了整体稳定约束的弦支穹顶结构确定钢索预应力值的可行方法。