Strength design of ancient canal boat is studied based on direct design method.

采用直接设计法对运河漕舫的首部结构进行了强度设计。

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Based on the demands of two limit states, the design control equations of cross section for prestressed concrete beam are derived and the direct design method is presented.

根据两类极限状态的基本要求，建立了预应力混凝土梁截面设计的控制方程，提出了直接设计方法。

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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。

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