简正波具有驻波性质，基本已反映在一阶近似解中。
Indoing SOS the standing wave nature of the solution is emphasized.
二阶近似解析解和数值解的误差比一阶近似解析解和数值解的误差小。
The error between the numerical solution and the two-order approximate analytic solution is smaller than the error between the numerical solution and the one-order approximate analytic solution.
给出了其在硬激励和软激励情况下的一阶近似解和共振情况下的频率响应方程。
And the first order approximate solution in the cases of hard excitation and soft excitation and the frequency resonance equation in the case of resonance are given.
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