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第7章 非线型系统分析 PowerPoint PPT Presentation


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第7章 非线型系统分析. 控制系统在不同程度上都存在着非线性。有些系统可通过在工作点附近 线性化来处理,但当系统包含有本质非线性特性时,就不能用线性化的方法处理。非线性系统与线性系统有本质的差别,非线性系统不满足叠加原理,它的稳定性不仅取决于控制系统的固有结构和参数,而且与系统的初始条件与输入信号有关。. 内容提要.

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第7章 非线型系统分析

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y=kxN(X)=kG(s)NyquistG(j)1k

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N(X)XN(X)G(j)1N(X)G(j)1N(X)G(j)1N(X)G(j)1N(X)1N(X)

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Matlab6.5MATLABSIMULINKSimulink Library BrowserFile\New\Modeluntitled(Save as)

Simulink library Browser DISCONTINUTIESMATH OPERATIONSSINKSOURCuntitled7-18(Integrator)(Dead Zone)SIMULINK\DISCONTINUTIES(Gain)(Dot Product)SIMULINK\MATH OPERATIONSXY Graph SIMULINK\SINKSIMULINK\SOURCE

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XY Graphx 7-18Integrator2

Integrator11 Integrator20 00[-0.30.3]

SIMULATION\ SIMULATION PARAMETERS\SOLVERSolverTypeFixed StepSolver()0.05Stop Time 50SIMULATION\START7-19a,0

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subplot(1,1,1),plot(xout(:,1),xout(:,2))

grid on,axis([-1,1,-1,1])

xlabel('X'),ylabel('dX')

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