The vibration of the nonlinear pendulum is studied by means of linearization and correction method, the curves of the period ratio and the relative error is plotted.
应用线化和校正方法，研究了单摆的非线性振动，作出了周期比和相对误差随摆角的变化曲线。
In order to analyze the theoretical model for relative acoustic-to-seismic coupling ratio method to detect land-mine, an experimental system for acoustic landmines detection was developed.
为了分析基于相对声-地震耦合率法探测地雷的理论模型，设计了一个声波探雷实验系统。
Based on the straight cascade and the fan cascade, the design parameter of aspect ratio, maximum relative thickness and solidity were remodeled by programmed design method.
在原直叶片与三维风扇叶片的基础上，通过编程设计手段改变其设计参数，使得叶片的展弦比，最大相对厚度与稠度等参数发生改变。
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