Analytical approximate solutions of the Duffing_Harmonic oscillator are dealt with.
研究达芬-谐波振子的解析逼近解。
In this paper, the sixth-order approximate analytical solutions of the strong nonlinear oscillation with positive damping are obtained by using newly developed homotopy analysis method.
阐述利用最新提出的同伦分析方法求解有正阻尼的强非线性振动方程，得到了该方程的六阶近似解析解。
Analytical approximate periods and periodic solutions to large amplitude oscillation of a simple pendulum are constructed using a new method.
构造了单摆大振幅振动的高精度解析逼近周期和周期解。
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