利用神经网络的非线性映射能力，能很好地解决负荷协调控制对象的动态特性具有非线性、时变性、参数可变等问题。
The coordinated control system has dynamic characteristic of nonlinear, varying parameter. Utilizing nonlinear mapping-capability of neural network solves these problems well.
采用可变长度单摆的力学模型对秋千振荡给出初等分析，采用微扰近似法导出了秋千的非线性参数共振解析解， 并进行了讨论。
A variable length simple pendulum model is introduced, elementary analysis and perturbation analytic solution of nonlinear differential equation for parametric resonance are presented.
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