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第七章 非线性系统理论 PowerPoint PPT Presentation


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第七章 非线性系统理论. 7.1 非线性系统问题概述. 7.2 常见非线性因素对系统影响. 7.3 描 述 函 数. 7.4 描述函数分析法. End. 7.1 非线性系统问题概述. 何谓 非线性系统 :只要系统中包含一个或一个以上具有非线性静特性的元件,即称为非线性系统。. 非线性系统的 主要特征 :.  系统的稳定性除与结构参数有关外,还与起始偏差的大小有关 。  统的响应形式与输入信号的大小和初始条件有关。  在没有外界周期变化信号输入时,非线性系统完全可能产生具有固定周期和幅值的稳定振荡过程。. 7.2 常见非线性因素对系统的影响.

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第七章 非线性系统理论

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7.1

7.2

7.3

7.4

End


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7.1


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7.2


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N(X)

G(j)

7.3

  • y(x)=-y(-x), A0=0


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N(X)

G(j)

7.4

  • 1+N(X)G(j)=0

N(X)G(j)=-1,

G(j)-1/N(X),

-1/N(X)


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G(j)-1/N(X)

X -1/N(X)G(j)


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1

-

-1

-1/N(X)

G(j)

2.122

7.1


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7.2


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