As an approximate method, with the trigonometric function, the simple pendulum dynamical equation is simplified, and the approximate formula for the period of simple pendulum movement is presented.
利用三角函数作为一种近似方法，对单摆的动力学方程进行了简化，给出了大角度条件下单摆运动的周期的近似公式。
By means of the precise time-integration method and the method of direct integration of state equation, the mode of the time-integration has been discussed on the structural dynamical responses.
采用精细时程积分法及状态方程直接积分法，讨论了求解动力响应问题的时程积分方式。
Based on the nonlinear dynamical theory of shallow shell, the nonlinear dynamical equation of the shallow reticulated conical shell is obtained by the method of quasi-shell.
根据薄壳非线性动力学理论，用拟壳法给出扁锥面网壳的非线性动力学控制方程。
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