在标准型双线性比例变结构系统循环进位控制的基础上，研究这种系统的比例—微分变结构控制。
On the basis of cyclic carry control of variable structure system with standard bilinear proportion a variable structure with bilinear proportion differentiation is studied.
在设有大吨位吊车系统的重型厂房中，吊车梁用钢量所占比例较大，对吊车梁的优化设计对工程造价影响很大，大跨多跨重型厂房吊车梁宜采用突缘变截面简支结构。
The weight of steel for crane beam has a great proportion in the total amount consumed in the construction of the heavy-duty plant with large-tonnage cranes.
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