推演了索单元的切线刚度矩阵，建立了斜拉桥施工控制计算的几何非线性模型。
The paper deduces tangent stiffness matrix and set up geometrical nonlinear model of construction control calculation of the cable-stayed bridge.
本文首先阐述了线性调宽式开关稳压器的组成原理；其次，计算了基准电压及占空系数，推演出电压调整率、输出内阻、效率等三项性能指标的数学公式；
The structural principle of the linear width type voltage regulator is presented and the expressions for selecting and computing the reference voltage and the duty factor are given.
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