Two types of resonance are studied, fundamental and principal parametricresonance.
研究了其基本参数共振和主参数共振两种情况。
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The method of multiple scales was used to solve directly the nonlinear differential equations and to derive the nonlinear modulation equation for the principal parametricresonance.
A variable length simple pendulum model is introduced, elementary analysis and perturbation analytic solution of nonlinear differential equation for parametricresonance are presented.