直接设计法 meaning in English

direct design method
direct design procedure

For iir , after researching pulse response method , step response method , bilinear transform method , direct design method , it is found that iir is unsatisfactory
对iir的脉冲响应不变法、阶跃响应不变法、双线性变换法和直接设计法进行研究，得出iir难以满足要求的结论。
Prestressed concrete slab - column structure has been widely used in long - span and multistory building . there are four commonly used analysis methods for slab - column structure , which are direct design method , equivalent frame method , plasticity method and finite element method
预应力混凝土板柱结构在大开间的多层及高层建筑中得到了广泛的应用，其设计方法有直接设计法、等代框架法、塑性分析法和有限元法等多种方法。