板孔 meaning in Chinese

diaphragm orifice

Research of metal magnetic memory testing of locomotive wheels
铁道车辆车轮辐板孔的磁记忆检测
Perforated - plate sieves for testing purposes
试验用板孔筛
Align the bit and the tgb hole
使钻头对准基板孔。
Starting from virtual work principle , with the combination of fem , the author led into elastic stiffness practical formulation of bi - direction cellular slab . after comparing the bi - direction elastic stiffness formulation with the approximately stiffness formulation , the author drew such a conclusion that if the hole - rib is comparatively big , the elastic stiffness of bi - direction cellular slab calculated by approximately formulation would be comparatively small , and therefore the elastic stiffness could calculated by the formulation illustrated in this paper
本文从虚功原理出发，结合有限元方法，给出了双向空腹板的弹性刚度实用计算公式，并与近似刚度公式进行对比分析，并得出结论：在双向空腹板孔间肋较大情况下，利用近似公式计算双向空腹板的弹性刚度偏小，可按本文提出的弹性刚度公式进行计算。