The reason is analysed by use of Floquet theory and multiple scales method in the paper.
本文用福洛开理论和多尺度方法，分别研究了其稳定域范围和引起倍频振动的各种因素。
A bifurcation equation of the steady state main resonance was obtained based on the multiple scales method.
在此基础上，用多尺度法求得稳态下主共振的分岔方程。
By the virtue of method of multiple scales, we have derived the amplitude equation.
我们用多重尺度方法，推导出了它的振幅方程。
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